Service, Repair, Grinders Service And Repair Manual Bunn Coffee Grinder LPG 2 41545.0000

User Manual: Bunn Coffee Grinder LPG-2

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Page Count: 79

GRINDERS

Includes: MHG, FPG,

FPG-2, LPG-2, G1, G2, G3,

G2 trifecta™, G9, G9WD,

G9-2 & G9-2T DBC

SERVICE & REPAIR MANUAL

BUNN-O-MATIC CORPORATION

POST OFFICE BOX 3227

SPRINGFIELD, ILLINOIS 62708-3227

PHONE: (217) 529-6601 FAX: (217) 529-6644

To ensure you have the latest revision of the Operating Manual, or to view the Illustrated Parts

Catalog, Programming Manual, or Service Manual, please visit the Bunn-O-Matic website, at

www.bunn.com. This is absolutely FREE, and the quickest way to obtain the latest catalog and

manual updates. For Technical Service, contact Bunn-O-Matic Corporation at 1-800-286-6070.

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

241545 031314

BUNN-O-MATIC COMMERCIAL PRODUCT WARRANTY

Bunn-O-Matic Corp. (“BUNN”) warrants equipment manufactured by it as follows:

1) Airpots, thermal carafes, decanters, GPR servers, iced tea/coffee dispensers, MCR/MCP/MCA single cup brewers, ther-

mal servers and ThermoFresh® servers (mechanical and digital) 1 year parts and 1 year labor.

2) All other equipment - 2 years parts and 1 year labor plus added warranties as speciﬁed below:

a) Electronic circuit and/or control boards - parts and labor for 3 years.

b) Compressors on refrigeration equipment - 5 years parts and 1 year labor.

c) Grinding burrs on coffee grinding equipment to grind coffee to meet original factory screen sieve analysis - parts and

labor for 4 years or 40,000 pounds of coffee, whichever comes ﬁrst.

These warranty periods run from the date of installation BUNN warrants that the equipment manufactured by it will be

commercially free of defects in material and workmanship existing at the time of manufacture and appearing within the

applicable warranty period. This warranty does not apply to any equipment, component or part that was not manufactured

by BUNN or that, in BUNN’s judgment, has been affected by misuse, neglect, alteration, improper installation or operation,

improper maintenance or repair, non periodic cleaning and descaling, equipment failures related to poor water quality,

damage or casualty. In addition, the warranty does not apply to replacement of items subject to normal use including but

not limited to user replaceable parts such as seals and gaskets. This warranty is conditioned on the Buyer 1) giving BUNN

prompt notice of any claim to be made under this warranty by telephone at (217) 529-6601 or by writing to Post Ofﬁce Box

3227, Springﬁeld, Illinois 62708-3227; 2) if requested by BUNN, shipping the defective equipment prepaid to an authorized

BUNN service location; and 3) receiving prior authorization from BUNN that the defective equipment is under warranty.

THE FOREGOING WARRANTY IS EXCLUSIVE AND IS IN LIEU OF ANY OTHER WARRANTY, WRITTEN OR ORAL, EX-

PRESS OR IMPLIED, INCLUDING, BUT NOT LIMITED TO, ANY IMPLIED WARRANTY OF EITHER MERCHANTABILITY

OR FITNESS FOR A PARTICULAR PURPOSE. The agents, dealers or employees of BUNN are not authorized to make

modiﬁcations to this warranty or to make additional warranties that are binding on BUNN. Accordingly, statements by such

individuals, whether oral or written, do not constitute warranties and should not be relied upon.

If BUNN determines in its sole discretion that the equipment does not conform to the warranty, BUNN, at its exclusive op-

tion while the equipment is under warranty, shall either 1) provide at no charge replacement parts and/or labor (during the

applicable parts and labor warranty periods speciﬁed above) to repair the defective components, provided that this repair

is done by a BUNN Authorized Service Representative; or 2) shall replace the equipment or refund the purchase price for

the equipment.

THE BUYER’S REMEDY AGAINST BUNN FOR THE BREACH OF ANY OBLIGATION ARISING OUT OF THE SALE OF THIS

EQUIPMENT, WHETHER DERIVED FROM WARRANTY OR OTHERWISE, SHALL BE LIMITED, AT BUNN’S SOLE OPTION

AS SPECIFIED HEREIN, TO REPAIR, REPLACEMENT OR REFUND.

In no event shall BUNN be liable for any other damage or loss, including, but not limited to, lost proﬁts, lost sales, loss of

use of equipment, claims of Buyer’s customers, cost of capital, cost of down time, cost of substitute equipment, facilities

or services, or any other special, incidental or consequential damages.

392, A Partner You Can Count On, Air Infusion, AutoPOD, AXIOM, BrewLOGIC, BrewMETER, Brew Better Not Bitter, Brew-

WISE, BrewWIZARD, BUNN Espress, BUNN Family Gourmet, BUNN Gourmet, BUNN Pour-O-Matic, BUNN, BUNN with

the stylized red line, BUNNlink, Bunn-OMatic, Bunn-O-Matic, BUNNserve, BUNNSERVE with the stylized wrench design,

Cool Froth, DBC, Dr. Brew stylized Dr. design, Dual, Easy Pour, EasyClear, EasyGard, FlavorGard, Gourmet Ice, Gourmet

Juice, High Intensity, iMIX, Infusion Series, Intellisteam, My Café, Phase Brew, PowerLogic, Quality Beverage Equipment

Worldwide, Respect Earth, Respect Earth with the stylized leaf and coffee cherry design, Safety-Fresh, savemycoffee.com,

Scale-Pro, Silver Series, Single, Smart Funnel, Smart Hopper, SmartWAVE, Soft Heat, SplashGard, The Mark of Quality in

Beverage Equipment Worldwide, ThermoFresh, Titan, trifecta, TRIFECTA (sylized logo), Velocity Brew, Air Brew, Beverage

Bar Creator, Beverage Proﬁt Calculator, Brew better, not bitter., Build-A-Drink, BUNNSource, Coffee At Its Best, Cyclonic

Heating System, Daypart, Digital Brewer Control, Element, Milk Texturing Fusion, Nothing Brews Like a BUNN, Picture

Prompted Cleaning, Pouring Proﬁts, Signature Series, Sure Tamp, Tea At Its Best, The Horizontal Red Line, Ultra are either

trademarks or registered trademarks of Bunn-O-Matic Corporation. The commercial trifecta® brewer housing conﬁgura-

tion is a trademark of Bunn-O-Matic Corporation.

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CONTENTS

Warranty and Trademark .................................................................................................3

Introduction ....................................................................................................................4

Recommended Daily Cleaning ........................................................................................4

G9WD Packaging & Shim Removal ................................................................................5

Operating Controls ..........................................................................................................6

Troubleshooting ............................................................................................................10

Service ..........................................................................................................................14

Component Access ...........................................................................................14

Bag Sensor .......................................................................................................15

Motor and Grind Chamber ................................................................................16

Capacitor ...........................................................................................................30

Circuit Breaker ..................................................................................................31

Hopper Selector Switch ....................................................................................32

Off/On/Start Switch ...........................................................................................34

Urn/Carafe Selector Switch ...............................................................................35

Batch Selector Switch .......................................................................................36

Potentiometer ...................................................................................................37

Rectiﬁer ............................................................................................................38

Relay .................................................................................................................39

Hopper Slide Plates ...........................................................................................43

Solenoid ............................................................................................................45

Timer ................................................................................................................46

Control Board ....................................................................................................50

Membrane Switch .............................................................................................52

EMI Filter ...........................................................................................................54

Funnel Sensing Coil ..........................................................................................55

Memory Clock Board ........................................................................................56

Display Board ....................................................................................................57

Wiring Schematics ........................................................................................................58

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INTRODUCTION

The Grinder will store various amounts of whole bean coffee and grind it to a preset grind and amount into

an awaiting funnel and ﬁlter or French Press from most commercial drip coffee brewers. The equipment is only

for indoor use on a sturdy counter or shelf. Adequate space must be available above the grinder to raise the lid

when adding beans. Use only with whole bean coffee.

The grind is preset at the factory to drip speciﬁcations as set forth by the United States Department of Com-

merce and adopted by the Coffee Brewing Center of the Pan American Coffee Bureau. Adjustments may be made

to alter both the amount and grind from the factory setting. Refer to the Installation & Operating Manuals for

ADJUSTMENTS.

CAPACITY CHART

FPG, LPG ................................Six pounds

FPG-2 ......................................Three pounds in each hopper

MHG ........................................Five pounds in each hopper

G9 ...........................................Nine pounds

G9-2, G9-2T DBC ....................Six pounds in each hopper

G9WD .....................................Five pounds

G1 ...........................................One pound

G2 ...........................................Two pounds

G3 ...........................................Three pounds

G2 trifecta ...............................Two pounds

RECOMMENDED DAILY CLEANING

The use of a damp cloth rinsed in any mild, nonabrasive, liquid detergent is recommended for cleaning all

surfaces on Bunn-O-Matic equipment. Care should be taken not to scratch the hopper or windows with any

abrasive material. Regular cleaning will keep your grinder looking new for years. Refer to the Installation &

Operating Manuals for CLEANING.

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Figure 1

Step 1 - Remove & discard tape holding funnel arm in place. (Figure 1)

Step 2 - Remove & discard two silicon tubes between funnel guide &

housing. (Figure 2)

Step 3 - Remove four screws in front housing panel. (Figure 3)

Step 4 - Remove & discard shim under transducer. (Figure 4)

Step 5 - Replace housing panel and secure four screws. (Figure 3)

Figure 3

Figure 2

Figure 4

WARNING

MUST BE COMPLETED BY AUTHORIZED SERVICE PERSONNEL.

DO NOT PLUG IN !

SEE INSTRUCTIONS BELOW BEFORE USING !

G9 WD - Packaging & Shim Removal

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Model G9-2

Off/On/Start Switch

OFF - (upper position) Switching to this position stops all operation of the grinder.

ON - (middle position) The switch will return to this position after a grind cycle has begun and will remain

in this position after grinding has ceased.

START - (lower, momentary position) Pressing the switch initiates a timed grind cycle.

Hopper Selector Switch

Left - Switching to this position allows beans to be dispensed from the

left hopper.

Right - Switching to this position allows beans to be dispensed from the

right hopper.

Batch Selector Switch (Optional)

Urn - Switching to this position allows the correct amount of beans to be

dispensed when grinding a large batch.

CARAFE - Switching to this position allows the correct amount of beans

to be dispensed when grinding a small batch.

Dispense Timer

The dispense timer controls the amount of beans that will leave the hopper in a grind cycle. The timer can

be adjusted to dispense a different amount from each hopper. The scale is from 0.4 to 150.0 seconds. Refer to

the Installation & Operating Manuals for Adjustments.

P633

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OPERATING CONTROLS

Model G9WD

Grind Pad (a)

Pressing initiates a grind cycle.

Stop Pad (b)

Pressing ends the operation of the grinder.

® Pad (c)

Pressing the copyright pad allows programming access.

Pads (d)

“Hidden” buttons used to navigate setup and programming menus.

Pads (e)

Press button to select small, medium or large batch size.

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URN

CARAFE

P1300

Batch Selector Switch (Optional)

URN - Switching to this position allows the correct amount of beans to be dispensed when grinding a large batch.

CARAFE - Switching to this position allows the correct amount of beans to be dispensed when grinding a small

batch.

Model G9

Off/On/Start Switch

OFF - (left position)

Placing the switch in this position stops the operation of the grinder.

ON - (center, resting position)

The switch will return to this position after a grind cycle has begun and will remain in this

position after grinding has ceased.

START - (right, momentary position)

Placing the switch in this position initiates a timed grind cycle.

OPERATING CONTROLS (Continued)

Models G1, G2, G3 & G2 trifecta

Off/On/Start Switch

OFF - (upper position)

Switching to this position stops the operation of the grinder.

ON - (center, resting position)

The switch will return to this position after a grind cycle has begun and will remain in this position after grinding has ceased.

START - (lower, momentary position)

Pressing the switch initiates grinding only when a bag is in place behind the chute.

Grind Selector

Allows the user to vary the grind for each bag of coffee. Each setting will provide precisely the same grind every time it is

selected.

Bag Sensor

Prevents the grinder from operating unless the back of a bag is in place behind the dispense chute.

Do not attempt to bypass this safety device.

P1028

P1029

Models LPG, LPG-2E

Off/On/Start Switch (Models LPG and LPG-2E)

OFF - (upper position) Switching to this position stops all operation of the grinder.

ON - (middle position) The switch will return to this position after a grind cycle has begun

and will remain in this position after grinding has ceased.

START - (lower, momentary position) Pressing the switch to this position and releasing initi-

ates a grind cycle.

Hopper Selector Switch (Model LPG-2E only)

LEFT - Switching to this position allows beans to be ground from the left hopper.

RIGHT - Switching to this position allows beans to be ground from the right hopper.

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Model G9-2T DBC

Grind Pad (a)

Pressing initiates a timed grind cycle.

Stop Pad (b)

Pressing ends the operation of the grinder.

® PAD (c)

Pressing the ® pad allows programming access.

OPERATING CONTROLS (Continued)

PANTONE

Red 032 CV

PANTONE

430 CVC

PANTONE

432 CVC

PANTONE

354 CVC

PANTONE

Black C

Hopper/Batch Selector Pads (d)

These pads are located on the funnel depictions on each side of the grinder with a total of 6 pads. Selecting one

of these pads will select the amount of grind and side from which to grind.

Example: Selecting the lower pad on the left side will grind enough beans from the left hopper of the grinder to

brew the amount programmed into grinder.

Control Board

The control board determines the amount of beans that will leave the hopper in a grind cycle. The timer portion

can be adjusted to dispense a different amount from each hopper and each batch size. The scale is from 0.4 to

99.9 seconds. Refer to the Installation & Operating Manuals for Adjustments.

Model MHG

Grind Pad (a)

Pressing initiates a timed grind cycle.

Stop Pad (b)

Pressing ends the operation of the grinder.

® PAD (c)

Pressing the ® pad allows programming access.

Hopper/Batch Selector Pads (d)

These pads are located on the funnel depictions on each side of the grinder with a total of 6 pads. Selecting one

of these pads will select the amount of grind and side from which to grind.

Example: Selecting the lower pad on the left side will grind enough beans from the left hopper of the grinder to

brew the amount programmed into grinder.

Power ON/OFF Pad (e) (100V Models)

Pressing the ON/OFF pad alternately turns the grinder on and off.

Control Board

The control board determines the amount of beans that will leave the hopper in a grind cycle. The timer portion

can be adjusted to dispense a different amount from each hopper and each batch size. The scale is from 0.4 to

99.9 seconds. Refer to the Installation & Operating Manuals for Adjustments.

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OPERATING CONTROLS (Continued)

P2947

Model FPG

Off/On/Start Switch

OFF - (upper position) Switching to this position stops all operation of

the grinder.

ON - (middle position) The switch will return to this position after a grind

cycle has begun and will remain in this position after grinding has ceased.

START - (lower, momentary position) Pressing the switch to this position

and releasing initiates a grind cycle.

Batch Selector Switch

Select Small, Medium or Large batch by turning the round selector knob

on the left front of the grinder.

Model FPG-2 DBC

Grind Pad (a)

Pressing GRIND initiates a timed grind cycle.

Stop Pad (b)

Pressing STOP ends the operation of the grinder.

® PAD (c)

Pressing the ® pad allows programming access

(see page 5).

Hopper/Batch Selector Pads (d)

These pads are located on the funnel depictions on each side of the grinder with a total of 6 pads. Selecting

one of these pads will select the amount of grind and side from which to grind.

Example: Selecting the lower pad on the left side will grind enough beans from the left side of the grinder

to brew the amount programmed into grinder.

Control Board

The control board determines the amount of beans that will leave the hopper in a grind cycle. The timer por-

tion can be adjusted to dispense a different amount from each hopper and each batch size. The scale is from 0.4

to 99.9 seconds. Refer to the Installation & Operating Manuals for Adjustments.

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TROUBLESHOOTING

A troubleshooting guide is provided to suggest probable causes and remedies for the most likely problems

encountered. If the problem remains after exhausting the troubleshooting steps, contact the Bunn-O-Matic

Technical Service Department.

• Inspection, testing, and repair of electrical equipment should be performed only by qualiﬁed service

personnel.

• All electronic components have ac voltage and dc voltage potential on their terminals. Shorting of ter-

minals or the application of external voltages may result in board failure.

• Intermittent operation of electronic circuit boards is unlikely. Board failure will normally be permanent.

If an intermittent condition is encountered, the cause will likely be a switch contact or a loose connection

at a terminal or crimp.

• Make certain that all electrical connections are tight and isolated.

WARNING

• Exercise extreme caution when servicing electrical equipment.

• Turn power OFF when servicing, except when electrical tests are speciﬁed.

• Follow recommended service procedures.

• Replace all protective shields or safety notices.

Problem

Grinder will not start.

Remedy

(A) Plug-in the grinder.

(B) Check the voltage at the wall

outlet with a voltmeter. It must be

120 volts ac for 120 volt models,

100 volts for 100 volt models, and

230 volts for 230 volt models.

(A) Momentarily press the Off/On/

Start switch to the “START” posi-

tion.

(B) Refer to Service - Off/On/Start

switch for testing procedures.

Press the “Reset” button, located on

rear of the grinder. Listen carefully

for a “click”. This resets the motor

protection circuit and indicates that

an overload may have been encoun-

tered by the motor. (An overload can

occur when something other than

coffee is inserted into the hopper for

grinding). Refer to Service - Circuit

Breaker for testing procedure.

Refer to Service - Timer for testing

procedures.

Probable Cause

1. No power or incorrect voltage

2. Off/On/Start switch

3. Circuit Breaker (Not applicable on

Model LPG with capacitor)

4. Timer

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TROUBLESHOOTING (cont.)

Problem Probable Cause

Remedy

Each motor is equipped with a

temperature and current overload

protection feature which will im-

mediately shut off the motor when

an overload has occurred. Check

the grinder for obstructions. Refer

to Service - Motor for testing pro-

cedures.

Refer to Service - Relay for testing

procedures.

(A) The receiving bag must be placed

on the tray screen and have the back

of the bag behind the dispense chute

to activate the sensor switch.

(B) Refer to Service - Bag Sensor

Switch for testing and adjustment

procedures.

(A) Place the switch in the “OFF”

upper position.

(B) Refer to Service - Off/On/Start

Switch for testing procedures.

Refer to Service - Timer for testing

procedures.

Refer to Service - Relay for testing

procedures.

(A) Remove bag from under the

dispense chute.

(B) Refer to Service - Bag Sensor

Switch for testing procedures.

Grinder will not start. (Continued)

Grinder will not shut off.

5. Motor

6. Relay

7. Bag sensor or Cup Sensor

1. Off/On/Start switch

2. Timer

3. Relay

4. Bag Sensor or Cup Sensor

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Begin each grind cycle by visually

inspecting the hopper(s) for ample

supplies of whole bean coffee.

Foreign materials must not block

the openings at the bottom of the

hopper(s).

Refer to Service - Solenoids for test-

ing procedures.

Refer to Service - Timer for testing

procedures.

Refer to Service - Off/On/Start

switch for testing procedures.

(A) Check to see that the slide plates

move freely to allow beans to travel

into the grind chamber.

(B) Refer to Service -Slide Plates for

testing procedures.

Refer to Service - Solenoids for test-

ing procedures.

Refer to Service - Solenoids for test-

ing procedures.

Remove both black ﬁllister head

screws holding the grinder selector

dial plate to the grinder. Carefully

remove the dial plate and rotor cup.

Inspect the shear plate for wear.

Replace if excessively worn or dam-

aged.

Refer to the Adjustment section

in the Installation and Operation

Manual.

Refer to Service - Snubber for re-

placement procedures.

1. Hopper(s)

2. Blockage of hopper(s)

3. Slide Gate Solenoids (Model LPG-

2E only)

4. Timer

5. Off/On/Start switch

6. Slide plates

7. Solenoids

8. Solenoid Limit Thermostat

9. Shear Plate

1. Timer adjustment

2. Snubber

Grinder starts, but will not dispense

from hopper.

Incorrect amount of coffee.

Problem Probable Cause Remedy

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PROBLEM PROBABLE CAUSE REMEDY

TROUBLESHOOTING (cont.)

Incorrect coffee grind dispensed.

Excessive chaff

Grinder only dispenses from one

hopper

Timer will not display or displays

incorrectly.

Incorrect weight of coffee dis-

pensed

1. Burr adjustment

1. Dechaffer

1. Hopper selector switch (Model

LPG-2E only)

1. Digital Timer

1. Grinder scale requires calibra-

tion.

2. Funnel handle touched during

grinding.

Refer to the Adjustment section

in the Installation and Operation

Manual.

Replace the dechaffer springs.

Replacement dechaffer springs are

provided in the literature package

accompnting the grinder.

Refer to Service - Hopper selector

switch for testing procedures.

(A) Unplug the grinder. Wait a few

seconds and plug it in again.

(B) Refer to Service - Timer for test-

ing procedures.

Refer to GRINDER SCALE CALI-

BRATION procedure.

Do not touch funnel or funnel han-

dle during grinding operation.

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SERVICE

This section provides procedures for testing and

replacing various major components used in this

grinder should service become necessary. Refer to

Troubleshooting for assistance in determining the

cause of any problem.

WARNING - Inspection, testing, and repair of electri-

cal equipment should be performed only by qualiﬁed

service personnel. The grinder should be unplugged

when servicing, except when electrical tests are re-

quired and the test procedure speciﬁcally states to

plug-in the grinder.

Component Access

WARNING - Unplug the grinder before the removal of

any panel or the replacement of any component.

All components are accessible by the removal of the

lid, hopper, or front and rear access panels. Mark and

retain all screws,washers and nuts for installation.

Component Locations

Some pictures showing component locations may be

general to all grinders unless the component is speciﬁc

to your model.

P602

PERSONAL INJURY

HAZARD.

KEEP FINGERS AND

FOREIGN OBJECTS

OUT OF HOPPER

OR CHUTE OPENING.

CAUTION

P603

P1306

P1307

P1308

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SERVICE (Cont.)

FIG. 1 BAG SENSOR SWITCH

P1704

Location:

The bag sensor switch is located inside the lower

front of the grinder housing behind the coffee dispens-

ing chute.

Test Procedure:

1. Disconnect the grinder and place a coffee bag

behind the dispense chute.

2. Remove the white/violet wire from the bag sensor

switch.

3. Check the voltage across the white/violet wire

from the bag sensor switch and the white wire,

red/black wire or red wire on the relay coil with

a voltmeter. Hold the Off/On/Start switch in the

“START” (lower) position and connect the grinder

to the power source. The indication must be:

a. 120 volts ac for two wire 120 volt models.

b. 230 volts ac for two wire 230 volt models.

c. 240 volts ac for two wire 240 volt models.

BAG SENSOR SWITCH (Models G1, G2, G3) or

CUP SENSOR SWITCH (MODEL G2 TRIFECTA)

4. Disconnect the grinder from the power source.

If voltage is present as described, proceed to

#5.

If voltage is not present as described, refer to the

Wiring Diagrams and check the grinder wiring

harness.

5. Check for continuity across the terminals on the

bag sensor switch.

If continuity is present as described, reconnect the

wires, the switch is operating properly.

If continuity is not present as described, replace the

switch.

Removal and Replacement:

1. Remove the wires from the switch.

2. Remove the two #8-32 keps nuts securing the bag

sensor assembly to the grinder housing.

3. Remove the two #2-56 screws, nuts and external

tooth lockwashers securing the switch to the bag

sensor assembly.

4. Mount the new switch to the bag sensor assembly

using two #2-56 screws, nuts and external tooth

lockwashers. Adjust the assembly by locating the

corner of the switch housing to the top edge of

the black metal mounting bracket.

5. Reattach the sensor assembly to the grinder hous-

ing and secure with two #8-32 keps nuts.

6. Refer to Fig. 2 when reconnecting the wires.

WHI/ORA to

Terminal “A”

on Relay

FIG. 2 BAG SENSOR SWITCH TERMINALS

WHI/VIO from

Off/On/Start

Switch

P1705

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SERVICE (Cont.)

AC MOTOR AND GRIND CHAMBER

FIG. 3 AC MOTOR AND GRIND CHAMBER

P1704

Location:

The motor is located inside the upper part of the

grinder housing.

Test Procedure:

1. Remove the plug located on the right side of the

housing. Press the red “Reset” button visible

through the opening. Listen carefully for a “click”.

This resets the motor protection circuit and may

indicate that something other than coffee was

inserted into the hopper for grinding.

If the grinder remains unable to start, proceed to #2.

If the grinder stops operating shortly after starting, refer

to removal and replacement instructions and inspect

for foreign materials.

2. Disconnect the grinder from the power source and

place a coffee bag behind the dispense chute.

3. Remove the electrical access panel at the rear of

the motor.

4. Check the voltage across the white, red or red/

black and white/blue wires on terminals L1 & L2

with a voltmeter. Connect the grinder to the power

source. When the Off/On/Start switch is momen-

tarily placed in the “START” (lower) position and

then left in the “ON” (center) position and a bag

is in place behind the coffee dispense chute.

The indication must be:

a. 120 volts ac for two wire 120 volt models.

b. 230 volts ac for two wire 230 volt models

c. 240 volts ac for two wire 240 volt models.

5. Disconnect the grinder from the power source.

If voltage is present as described replace the motor.

If voltage is not present as described, reconnect the

white, red or red/black and white/blue wires to the mo-

tor, refer to the Wiring Diagrams and check the grinder

wiring harness.

Removal and Replacement - Motor (Refer to FIG.6):

1. Remove the plate on the rear of the motor and

disconnect all wires from the motor.

2. Remove the two .250”-20 screws (1) securing

grind selector dial plate and grind selector knob

(2) to the grind chamber. Remove dial plate and

selector knob as an assembly.

3. Slide burr (7), auger rotor/spring assembly (3),

shear plate (4) and burr rotor cup (5) off the

grinder motor shaft as an assembly.

4. Remove the two .250”-20 screws (8) securing the

stationary burr (9) to the grind chamber.

5. Remove bushing (10) and shaft extension (11)

from the grinder motor shaft.

6. Remove the two #8 thread forming screws (12)

securing the ﬁll plate (13) to grinder housing and

remove plate (13).

7. Remove the four #10-24 screws (14) securing the

chute assembly (15) to the grind chamber and

remove chute assembly (15).

8. Remove the four .250”-20 screws, ﬂat washer and

rubber washers securing the motor to the mount-

ing bracket.

9. Remove motor out the rear of the grinder hous-

ing.

10. Remove the four .250”-20 cage nuts from the

motor mount.

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SERVICE (Cont.)

WHI/BLU to

Relay N.O.(K4)

WHI to Cordset (120V)

RED/BLK to Cordset (230V)

GRN to Ground (120V)

GRN/YEL to Ground (230V)

P1310

FIG. 4 AC MOTOR TERMINALS

11. Clean all grinding burrs and mounting surfaces

before reassembly.

12. Install the four .250”-20 cage nuts on the new

motor.

13. Place the new motor with hopper collar and bush-

ing into position on the bushings on the motor

mounting bracket.

14. Using four .250”-20 screws, ﬂat washers and

rubber washers secure the motor to the mounting

bracket.

15. Install stationary burr (9) to the grind chamber

housing using two .250”-20 screws.

16. Install burr (7) and burr auger rotor/spring as-

sembly (3) on to motor shaft.

17. Install motor shaft extension (11) on motor

shaft.

18. Align the slot in the motor shaft extension (11) with

the slot in the burr auger rotor/spring assembly

(6) and install shear plate (4).

AC MOTOR AND GRIND CHAMBER (cont.)

19. Install burr rotor cup (5).

20. Install grind selector dial plate and grind selector

knob assembly on the grind chamber housing and

secure with two .250”-20 screws.

21. Refer to Fig. 4 and reconnect the wires.

22. Refer to ADJUSTMENTS in the Installation and

Operating Manual, and reset the burrs.

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SERVICE (Cont.)

FIG. 5 GRIND CHAMBER COMPONENTS

P1708

20 7 6 4 5

18 1 19 17

11 10 9 8 3

2 1

AC MOTOR AND GRIND CHAMBER (cont.)

Removal and Replacement - Grind Chamber - Fig. 5:

1. Loosen the two set screws (16) securing the grind

selector knob to the grind selector dial plate (18) and

remove knob.

2. Remove the adjusting screw w/bearing (19). Inspect

adjusting screw w/bearing for wear. Replace if exces-

sively worn or damaged.

3. Remove the two .250”-20 screws (1) securing the grind

selector dial plate (18) to the grind housing.

4. Slide burr auger rotor/spring assembly (3) off of the

grinder motor shaft with burr rotor cup (5), shear plate

(4) and burr (7) as an assembly.

5. Remove burr rotor cup (5) and shear plate (4) from burr

auger rotor/spring assembly (6). Inspect shear plate (4)

for wear. Replace if excessively worn or damaged.

6. Remove the two .250” screws (20) securing burr (7) to

burr auger rotor/spring assembly (6) and remove burr

(7). Inspect burr (7) for wear. Replace if excessively

worn or damaged.

7. Remove the two .250”-20 screws (8) securing the sta-

tionary burr (9) to grind chamber housing and remove

burr. Inspect for wear. Replace if excessively worn or

damaged.

NOTE: Burrs are serviced in sets of two with hardware.

8. Clean all grinding burrs and mounting surfaces before

reassembly.

9. Remove bushing (10) and shaft extension (11) from

grinder motor shaft. Inspect for wear. Replace if exces-

sively worn or damaged.

10. Install shaft extension (11) and bushing (10) onto the

grinder motor shaft.

11. Install stationary burr (9) inside the grind chamber and

secure with two .250” -20 screws (8).

12. Install burr (7) on burr auger rotor/spring assembly (6)

securing with two .250”-20 screws (20).

13. Slide burr auger rotor/spring assembly and burr (3)

onto the motor shaft.

14. Align the slot in the shaft extension and the slot in the

burr auger rotor/spring assembly and install shear plate

(4).

15. Install burr rotor cup (5) onto the burr auger rotor/spring

assembly (6).

16. Install the adjusting screw w/bearing (19) into the grind

selector dial plate (18).

17. Install grind selector dial plate (18) with adjusting screw

w/bearing (19) onto the grind chamber and secure with

two .250”-20 screws (1).

18. Install grind selector knob (17) onto the grind selector

dial plate (18).

NOTE: Refer to ADJUSTMENTS in the Installation and Op-

erating Manual, and reset the burrs.

41545 122209

RELEASED FOR PRODUCTION

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SERVICE (Cont.)

DC MOTOR AND GRIND CHAMBER - G1MD ONLY

FIG. 6 DC MOTOR AND GRIND CHAMBER

P1706

Location:

The motor is located inside the upper part of the grinder

housing.

Test Procedures:

1. Remove the rear panel. Press the red “Reset”

button visible on the rear of the motor. Listen care-

fully for a “click”. This resets the motor protection

circuit and may indicate that something other than

coffee was inserted into the hopper for grinding.

If the grinder remains unable to start, proceed to #2.

If the grinder stops operating shortly after starting, refer

to removal and replacement instructions and inspect

for foreign materials.

2. Disconnect the grinder from the power source and

place a coffee bag behind the dispense chute.

3. Remove the black wire from the rectiﬁer (+) ter-

minal and the red wire from the (-) terminal.

4. Check the voltage across the (+) and (-) terminals

with a voltmeter. Connect the grinder to the power

source. When the Off/On/Start switch is momen-

tarily placed in the “START” (lower) position and

then left in the “ON” (center) position and a bag

is in place behind the coffee dispense chute. The

indication must be approximately 108 volts dc.

5. Disconnect the grinder from the power source.

If voltage is present as described replace the motor.

If voltage is not present as described, reconnect the

white or red and white/blue wires to the motor, refer

to the Wiring Diagrams and check the grinder wiring

harness.

Removal and Replacement - Motor (Refer to Fig. 8)

1. Disconnect all wires from the motor.

2. Remove the two .250”-20 screws (1) securing

grind selector dial plate and grind selector knob

(2) to the grind chamber. Remove dial plate and

selector knob as an assembly.

3. Slide burr (7), auger rotor/spring assembly (3) and

burr rotor disc (4) off the grinder motor shaft as

an assembly.

4. Remove the two .250”-20 screws (8) securing the

stationary burr (9) to the grind chamber.

5. Remove bushing (10) and washer (11) from the

grinder motor shaft.

6. Remove the two #8 thread forming screws (12)

securing the ﬁll plate (13) to grinder housing and

remove plate (13).

7. Remove the four #10-24 screws (14) securing the

chute assembly (15) to the grind chamber and

remove chute assembly (15).

8. Disconnect all the wires from the rectiﬁer (23).

9. Remove the four .312”-18 screws (20), rubber

washers (22) and flat washers (21) securing

the motor and bracket to the grinder housing

bracket.

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SERVICE (Cont.)

DC MOTOR AND GRIND CHAMBER - G1MD ONLY

(cont.) BLU to BLU from Rectiﬁer

BLU to WHI/BLU from

Relay (3)

RED to Rectiﬁer (-)

BLK to Rectiﬁer (+)

FIG. 7 DC MOTOR TERMINALS

P1710

10. Remove motor and bracket out the rear of the

grinder housing.

11. Remove the two .250”-20 screws securing the

motor to the front of the mounting bracket.

12. Remove the two #10-32 screws securing the mo-

tor to rear of the mounting bracket.

13 Remove motor from bracket.

14. Clean all grinding burrs and mounting surfaces

before reassembly.

15 Place the new motor with hopper collar into posi-

tion on the motor mounting bracket.

16. Using two .250”-20 screws secure the motor to

the front of the mounting bracket.

17. Using two #10-32 screws secure the motor to the

rear of the mounting bracket

18. Install motor and bracket through the rear of the

grinder, position on the grinder housing bracket

and secure with four .312”-18 screws (20), rubber

washers (22) and ﬂat washers (21).

19. Install stationary burr (9) to the grind chamber

housing using two .250”-20 screws (8).

20. Install burr (7), burr auger rotor/spring assembly

(3) and burr rotor disc (4) on to motor shaft.

21. Install grind selector dial plate and grind selector

knob assembly (2) on the grind chamber housing

and secure with two .250”-20 screws.

22. Refer to Fig. 7 and reconnect the wires to the

motor and Fig. 37 and reconnect the wires to the

rectiﬁer.

23. Refer to ADJUSTMENTS section and reset the

burrs.

Removal and Replacement - Grind Chamber - Refer

to Fig. 8:

1. Loosen the two set screws (16) securing the grind

selector knob to the grind selector dial plate (18)

and remove knob.

2. Remove the adjusting screw w/bearing (19). In-

spect adjusting screw w/bearing for wear. Replace

if excessively worn or damaged.

3. Remove the two .250”-20 screws (1) securing the

grind selector dial plate (18) to the grind housing

and remove plate.

4. Slide burr auger rotor/spring assembly (3) off of

the grinder motor shaft with burr (7) as an as-

sembly.

5. Remove the two .250”-20 screws (5) securing

burr (7) to burr auger rotor/spring assembly (6),

remove burr (7) and burr rotor disc (4). Inspect

burr (7) for wear. Replace if excessively worn or

damaged.

6. Remove the two .250”-20 screws (8) securing the

stationary burr (9) to grind chamber housing and

remove burr. Inspect for wear. Replace if exces-

sively worn or damaged.

NOTE: Burrs are serviced in sets of two with hard-

ware.

7. Remove bushing (10) and washer (11) from

grinder motor shaft. Inspect for wear. Replace if

excessively worn or damaged.

8. Clean all grinding burrs and mounting surfaces

before reassembly.

9. Install washer (11) and bushing (10) onto the

grinder motor shaft.

10. Install stationary burr (9) inside the grind chamber

and secure with two .250” -20 screws (8).

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SERVICE (Cont.)

DC MOTOR AND GRIND CHAMBER - G1MD ONLY

(cont.)

FIG. 8 MOTOR AND GRIND CHAMBER REMOVAL

P1711

5 7 6

18 1 19 17

9 8 11 10 3

4 2 1

11. Install burr (7) on burr auger rotor/spring assem-

bly (6) securing with two .250”-20 screws (5).

12. Slide burr auger rotor/spring assembly and burr

(3) onto the motor shaft.

13. Install burr rotor disc (4).

14. Install the adjusting screw w/bearing (19) into the

grind selector dial plate (18).

15. Install grind selector dial plate (18) with adjust-

ing screw w/bearing (19) onto the grind chamber

housing and secure with two .250”-20 screws

(1).

16. Install grind selector knob (17) onto the grind

selector dial plate (18).

NOTE: Refer to ADJUSTMENTS and reset the burrs.

41545 122209

RELEASED FOR PRODUCTION

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SERVICE (Cont.)

P1022

Location:

The motor is located inside the hopper assembly.

Test Procedures:

1. Disconnect grinder from the power supply.

2. On Model LPG-2E, disconnect the black wire and

the white wire to the motor from the main wiring

harness, the red wire to the circuit breaker and the

red wire to the Off/On/Start switch. On Model LPG

disconnect the motor wiring harness from the main

wiring harness.

3. Connect the leads of an ohm meter to the red wires

from the motor.

If continuity is present the overload is good.

If continuity is not present the overload will not reset,

replace the motor.

4. Set an ohm meter to read at least 20 ohms. Connect

the leads from the ohm meter to the black wire and

the white from the motor. The ohm reading should

be approximately 18 ohms. Using the bean agitator

slowly rotate the motor shaft in approximately 1/8

turn steps through one full rotation. If ohm readings

are consistent motor windings are good. If readings

vary more than ±1 ohm, replace motor.

NOTE: Clean all grind burrs and mounting surfaces

before reassembly.

FIG. 9 MOTOR

Removal and Replacement:

1. On Model LPG-2E, disconnect the black wire and

the white wire to the motor from the main wiring

harness, the red wire to the circuit breaker and the

red wire to the Off/On/Start switch. On Model LPG

disconnect the motor wiring harness from the main

wiring harness.

2. On Model LPG-2E, disconnect the red wire from

the left and right solenoid, the orange wire from

the left solenoid and the violet wire from the right

solenoid.

P1049

FIG. 10 MOTOR REMOVAL

3. Refer to Fig 10. Remove the three #10-32 x .25”

screws (1) securing the motor to the motor support

bracket.

4. Remove the motor, solenoid and solenoid com-

ponents (2) from the hopper housing (3) as an

assembly.

NOTE: Steps 5 thru 12 apply only to Model LPG-2E.

5. Refer to Fig.11. Remove the three #8-32 Keps

nuts.

6. Lift the retaining ring w/hopper gasket (1) over the

motor and burr housing assembly (6). Set aside for

reassembly.

7. Lift slide plate, solenoid plunger and spring (2) off

of the dowel pin in the mounting ring and slide

solenoid plunger and spring (2) out of solenoid

coil. Set aside for reassembly. Repeat for opposite

side.

MOTOR (Models LPG & FPG)

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SERVICE (Cont.)

1. Retaining Ring W/Hopper Gasket

2. Slide Plate, Solenoid Plunger and Spring

3. Spacer Plate

4. Mounting Ring, Solenoid and Solenoid Mounting

Plate

5. Setscrew, #8-32

6. Motor and Burr Housing

P1050

FIG. 11 SOLENOID AND GATES

8. Remove spacer plate (3) and set aside for reas-

sembly.

9. Lift solenoid bracket and solenoids (4) over the

motor and burr housing assembly (6) and set aside

for reassembly.

10. Remove the #8-32 setscrew (5) and set aside for

reassembly.

11. Lay motor on it’s side.

NOTE: Refer to Fig. 14 for the disassembly and assembly

of the burrs and rotor.

12. Remove the two #10-32 ﬁllister head screw securing

burr housing cap (10) to the burr housing.

13. Remove cap, burr adjusting screw, decafﬁng plate

and decaffer support (10) as an assembly. Set aside

for reassembly.

14. Remove load disc (11) and set aside for reassem-

bly.

15. Slide rotor (12), lower burr (13) and spring (14)

as an assembly off the motor shaft, set aside for

reassembly.

16. Remove burr housing divider (8) and set aside for

reassembly.

NOTE: Inspect rotor. If rotor needs to be replaced,

remove the two #10-32 binding head screws securing

lower burr (13) to the rotor and remove burr. Install

lower burr (13) on new rotor (12) using two #10-32

binding head screws.

17. Slide spring retaining bushing (15) off the motor

shaft and set aside for reassembly.

18. Remove the two #10-32 binding head screws secur-

ing the upper burr (16) to the motor and housing

assembly (17).

19. Remove the upper burr (16) and set aside for reas-

sembly.

NOTE: If burrs need to be replaced, they must be re-

placed in matched pairs.

MOTOR (Models LPG & FPG)

41545 122209

RELEASED FOR PRODUCTION

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SERVICE (Cont.)

20. Remove the two #8-32 ﬂat head screws securing

the motor cover (18) to the motor and housing

assembly (17) and remove the cover. Set aside for

reassembly.

21. Discard old motor and housing assembly.

22. Place new motor on it’s side and install motor cover

(18) using two #8-32 ﬂat head screws.

23. Install upper burr (16) to the new motor and hous-

ing assembly (17) using two #10-32 binding head

screws.

24. Install spring retaining bushing (15) on motor

shaft.

25. Refer to Fig. 11. Install burr housing divider (8) in

slot in the burr housing and secure with #8-32 cup

point setscrew (7), for Model LPG-2E only.

26. Refer to Fig. 12. Install rotor (12), lower burr (13) and

spring (14) as an assembly on the motor shaft.

27. Install load disc (11) ﬂat side towards rotor.

28. Install burr housing cap (10), adjusting screw,

dechafﬁng spring plate and dechaffer support as an

assembly to the new motor and housing assembly

(17) using two #10-32 ﬁllister head screws.

29. Set motor upright with burr housing at the bot-

tom.

NOTE: Steps 30 thru 33 apply only to Model LPG-2E.

30. Install solenoids and solenoid bracket (4) as an

assembly on the new motor.

31. Install spacer plate (3) making sure the hole in the

spacer plate aligns with the hole in the mounting

ring.

32. Install solenoid plunger with spring and slide plate

(2) as an assembly into the solenoid coil. Place slide

plate on the dowel in the mounting ring. Repeat for

the opposite side.

33. Install retaining ring w/hopper gasket (1) using

three #8-32 pan head screws and three #8-32 keps

nuts.

34. Refer to Fig.10. Install motor, solenoids and solenoid

components (2) in the hopper housing (3) using

three #10-32 truss head screws (1).

35. Reconnect wires for motor and solenoids. Refer to

wiring schematic.

FIG. 12 ROTOR/AUGER, BURRS AND MOTOR COVER

10 11 12 13 14 15 16 17 18

P1051

MODEL LPG ONLY

MOTOR (Models LPG & FPG)

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SERVICE (Cont.)

DECHAFFER (Models LPG & FPG)

FIG. 13 DECHAFFER P1062

Location:

The dechaffer spring plates are located in the burr

housing cap.

FIG. 14 DECHAFFER REMOVAL/REPLACEMENT

P1063

Removal and Replacement: Refer to Fig. 14

1. Remove coffee beans from hopper(s).

2. Lay grinder on it’s back.

3. Remove the #4-40 truss head screw securing

dechaffer support (1) to the burr housing cap.

4. Remove dechaffer support (1).

5. Remove dechaffer spring plate (2) from burr hosing

cap.

6. For models with extra ﬁne dechaffer, remove dechaf-

fer support (3).

7 Place new dechaffer spring plate (2) in the slot in

the burr housing cap.

8. Place dechaffer support (1) over dechaffer spring

plate (2), support (3) and secure with a #4-40 truss

head screw.

OPTONAL EXTRA

FINE DECHAFFER

3 2 1

41545 122209

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SERVICE (Cont.) 2. The entire wiring harness must be fed into the bottom

of the grinder housing through the hole in the motor

mounting plate.

3. Remove both 6-32 screws beneath the upper front

inspection panel.

4. Remove the six 10-32, hex head screws on top of the

motor mounting plate.

5. Slowly slide the assembly out the rear of the grinder

housing. The mounting plate will have to be raised

to gain clearance for the motor hardware and wiring

harness bushing.

6. Remove the four 5/16”-18 bolts and nuts to separate

the motor from the mounting plate.

7. Mount the new motor and tighten the four bolts and

nuts. They should be tightened approximately one full

turn past snug.

8. Slide the motor mounting plate into the rear of the

grinder housing.

9. Feed the wiring harness into the top of the housing

through the hole in the motor plate.

10. Reinstall the six 10-32 hex head screws through the

motor plate and the two 6-32 screws through the

housing.

11. Reattach the green wire to the 10-32 stud on the motor

mounting plate.

12. Refer to the Off/On/Start switch section when recon-

necting the switch wires.

13. Refer to the illustration below when reconnecting the

motor wires.

P1309

Location:

The motor is located in the upper wrapper under the

hopper.

Test Procedure:

1. Remove the hole plug located on the right side of the

housing. Press the red “Reset” button visible through

the opening. Listen carefully for a “click”. This resets

the motor protection circuit and may indicate that

something other than coffee was inserted into the

hopper for grinding.

If the grinder remains unable to start, proceed to step 2.

If the grinder stops operating shortly after starting, refer to

the removal and replacement steps to gain access-to the

grind chamber. Remove any foreign materials that may be

found.

2. Disconnect the grinder from the power supply.

3. Remove the electrical access panel at the rear of the

motor.

4. Check the voltage across terminals L1 & L2 of the

motor with a voltmeter when the Off/On/Start switch

is placed in the “START” (right) position and released.

Connect the grinder to the power supply. The indication

must be:

(a) 120 volts ac for two wire 120 volt models.

(b) 240 volts ac for two wire 240 volt models.

5. Disconnect the grinder from the power supply.

If voltage is present as described and the grinder remains

unable to start, replace the motor.

If voltage is not present as described, refer to the Wiring

Diagrams, and check the grinder wiring harness.

Removal and Replacement - MOTOR

1. Remove all wires from the Off/On/Start switch, motor,

and motor mounting plate.

GRN to Chasis Ground

YEL to Snubber

P621

WHI/ BLU to Snubber

WHI/BLU to Relay

WHI/BLK to Snubber

WHI/BLK to Cordset

(120V models)

RED/BLK to Cordset

(230V models)

FRANKLIN MOTOR

MARATHON MOTOR

GRN to Chasis Ground

YEL to Snubber

WHI/ BLU to Snubber

WHI/BLK to Snubber

WHI/BLU to Relay

WHI/BLK to Cordset

MOTOR (Models G9, G9-2, MHG)

FIG. 15 MOTOR

FIG. 16 MOTOR WIRING

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678910

1. Indicator Adjustment Cap & Decal

2. Adjusting Screw

3. Burr Housing Cap

4. Rotor Cup

5. Shear Plate

6. Rotor

7. Spring

8. Burr (Rotating)

9. Burr (Stationary)

P1311

Removal and Replacement - GRIND CHAMBER

1. Refer to the illustration above and remove the two

1/4”-20, hex head screws holding the burr housing

cap(3) to the burr housing; carefully remove the

burr housing cap. Inspect the adjusting screw(2)

to see if the thrust plug is worn.

Replace if excessively worn or damaged.

2. Carefully remove rotor cup(4), shear plate(5), and

burr rotor(6) from the grinder. Inspect the shear

plate and burr(8) for wear.

Replace if excessively worn or damaged.

3. Remove and inspect stationary burr(9) for wear.

Replace if excessively worn or damaged.

NOTE: Burrs must be replaced as a set.

4. Inspect the grind chamber and remove any for-

eign materials. The burrs will not properly seat

in the chamber if any material or coffee particles

remain.

5. Reinstall the stationary burr, spring, burr rotor,

shear plate, rotor cup, and burr housing cap to the

burr housing.

6. Refer to ADJUSTMENTS in the Installation and

Operating Manual to vary the grind dispensed.

SERVICE (Cont.)

MOTOR (Models G9, G9-2, MHG)

FIG. 17 MOTOR AND GRIND CHAMBER

41545 122209

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SERVICE (Cont.)

SNUBBER (Models G9, G9-2, MHG)

COARSE FINE

P611 GRN to Chasis Ground

YEL to Snubber

P621

WHI/ BLU to Snubber

WHI/BLU to Relay

WHI/BLK to Snubber

WHI/BLK to Cordset

(120V models)

RED/BLK to Cordset

(230V models)

FRANKLIN MOTOR

MARATHON MOTOR

GRN to Chasis Ground

YEL to Snubber

WHI/ BLU to Snubber

WHI/BLK to Snubber

WHI/BLU to Relay

WHI/BLK to Cordset

Location:

The snubber is located at the back of the motor

attached to the right side of the wiring harness.

Removal and Replacement:

1. Remove snubber wires from the motor terminals.

2. Cut the ties holding snubber to the wiring har-

ness.

3. Refer to the following illustration when reconnect-

ing the wires.

4. Fasten snubber to the wiring harness using new

ties.

FIG. 18 SNUBBER

FIG. 19 SNUBBER

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CALIBRATION

1. Place empty funnel into funnel rails.

2. Press and hold the right hidden (copyright) button until the “MACHINE TYPE” menu appears. (See level 2

programming)

3. Press the middle button under the screen until the “CALIBRATE SCALES?” menu appears.

4. Press the right button under “YES” in the “CALIBRATE SCALES?” screen.

5. Press the middle button under “TARE”.

6. When the “PLACE 8oz” screen appears, remove the funnel, and place a calibrated 8oz weight in the funnel.

Replace the funnel in the funnel rails.

7. Press the middle button under “DONE”. The grinder will go through a calibration, and then return to the main

screen when calibration is complete.

8. Remove the weight from the funnel. The grinder is now ready calibrated and ready for normal operation.

SERVICE (Cont.)

Grinder Scale (Model G9WD only)

41545 072710

Press the hidden

(copyright) button for

3 seconds in “ENTER

PASSWORD” menu.

Finished, returns

to main screen

MODIFY MAXBIT

NO SPREAD? YES

CALIBRATE SCALE ?

NO YES

MACHINE TYPE

WEIGHT TIMED

SHUToff Bits ##

(-) DONE (+)

MaxBits read #

(-) DONE (+)

PLEASE WAIT

CAL

PLACE 8.00 oz

EXIT DONE

PLEASE WAIT

TARE

CALIBRATE SCALES

EXIT TARE

CALIBRATION OZ

(-) 8.00 (+)

LEVEL 2 FUNCTIONS:

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

P1745

FIG. 20 CAPACITOR

Location:

The capacitor is located inside the front panel of

the hopper housing next to the Off/On/Start switch.

Test Procedure:

1. Disconnect grinder from the power source.

2. Visually inspect the capacitor for leakage. If leakage

is visible, replace the capacitor.

3. Connect the grinder to the power source, if the mo-

tor does not run, disconnect the capacitor wiring

harness from the main wiring harness. If the motor

now runs, replace the capacitor.

Capacitor (Model LPG only)

P1747

FIG. 21 CAPACITOR TERMINALS

OFF/STOP

START

1. Place filter into funnel and slide funnel into rails.

2. Momentarily push the switch to "START" position.

3. Grinder will automatically stop when finished.

BLK WHI/BRN

Removal and Replacement:

1. Disconnect the capacitor wiring harness from the

main wiring harness.

2. Remove the #8-32 nut attaching the capacitor and

mounting bracket to the hopper housing and remove

the bracket, shield, capacitor and capacitor wiring

harness as an assembly.

3. Disconnect the wiring harness from the capacitor

and attach it to a new capacitor making sure the

black wire attaches to the positive (+) pole, FIG.

21.

4. Wrap the shield around the capacitor and place into

the mounting bracket. Slide the lower tab of the

mounting bracket between the wrapper and base

and secure in place over the mounting stud with

the #8-32 nut.

5. Reconnect the wiring harness to the main wiring

harness.

SERVICE (Cont.)

41545 122209

RELEASED FOR PRODUCTION

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SERVICE (Cont.)

Circuit Breaker (Models LPG, LPG-2E, FPG, FPG-2 DBC)

P1036

FIG. 22 CIRCUIT BREAKER

P1037

FIG. 23 CIRCUIT BREAKER TERMINALS

RED from Motor-LPG-2E

BLK from Start Switch-LPG

BLK from Power Cord

Removal and Replacement:

1. Remove the wires from the circuit breaker.

2. Remove the face nut securing circuit breaker to the

motor support.

3. Remove circuit breaker.

4. Install new circuit breaker in motor support and

secure with face nut.

5. Reconnect the wires.

6. Refer to FIG. 23 when reconnecting the wires.

Location:

The circuit breaker is located on the rear of the

grinder next to the power cord strain relief bushing. The

circuit breaker is not available on Model LPG equipped

with capacitor.

Test Procedure:

1. Disconnect grinder from the power source.

2. Remove the wires from the circuit breaker.

3. Check for continuity between the terminals. Conti-

nuity must be present between the terminals.

If continuity is present as described the circuit breaker

is functioning properly.

If continuity is not present as described, press reset

button and repeat step #3, if continuity is not present

as described, replace the circuit breaker.

41545 122209

RELEASED FOR PRODUCTION

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SERVICE (Cont.)

P1038

Hopper Selector Switch (Model LPG-2E only)

P1029

Location:

The Hopper Selector Switch is located in the

lower left front of the hopper housing.

Test Procedure:

1. Disconnect grinder from the power supply.

2. Remove all wires from the switch terminals.

3. Check that the switch is installed properly, FIG.

25.

4. Place the selector switch in the left position.

5. Check for continuity across the terminals on the

rear of the switch.

If continuity is present as described proceed to #6.

If continuity is not present as described, replace the

switch.

FIG. 24 HOPPER SELECTOR SWITCH

FIG. 25 HOPPER SELECTOR SWITCH TERMINALS

(Viewed from rear)

WHI to OFF/ON/START Switch

BLU to Timer P1-4 (BLU)

6. Place the selector switch in the right position.

7. Check for continuity across the terminals on the

rear of the switch. Continuity should not be present

across terminals in the right position.

If continuity is not present as described, reconnect the

wires, the switch is operating properly.

If continuity is present replace the switch.

Removal and Replacement:

1. Remove all wires from the switch terminals.

2. Compress the clips inside the front of the housing

and gently push the switch through the opening.

3. Push the new switch into the opening and spread

the clips to retain the switch in the housing.

4. Refer to Fig. 25 when reconnecting the wires.

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SERVICE (Cont.)

Hopper Selector Switch (Model G9-2 only)

FIG. 26 HOPPER SELECTOR SWITCH

P594

Location:

The hopper selector switch is located in the center

on the front of the hopper housing.

Test Procedure:

1. Disconnect the grinder from the power source.

2. Remove all wires from the switch terminals.

3. Place the selector switch in the left position.

4 Check for continuity across the center and right

terminals on the rear of the switch.

5. Continuity must not be present across the center

and left terminals on the rear of the switch.

6. Check the bottom row, then the top row of termi-

nals.

If continuity is present as described proceed to #7.

If Continuity is not present as described replace the

switch.

7. Place the selector switch in the right position.

8. Check for continuity across the center and left

terminals on the rear of the switch.

9. Continuity must not be present across the center

and right terminals on the rear of the switch.

10. Check the bottom row, then the top row.

If continuity is present as described, reconnect the

wires, the switch is operating properly.

If continuity is not present as described, replace the

switch.

P787

FIG. 27 HOPPER SELECTOR SWITCH TERMINALS

Removal and Replacement:

1. Remove all wires from the switch terminals.

2. Compress the clips inside the front of the housing

and gently push the switch through the opening.

3. Push the new switch into the opening and spread

the clips to retain the switch in the housing.

4. Refer to Fig. below when reconnecting the wires.

ORA to Timer P1-6

BLU to Timer P1-8

YEL to Timer P1-1

41545 122209

RELEASED FOR PRODUCTION

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SERVICE (Cont.)

Location:

The Off/On/Start switch is located to the left side on

the front of the housing above the upper front inspec-

tion panel.

Test Procedure:

1. Unplug the grinder.

2. Remove the black wire from the switch.

3. Check for continuity across the black wire from the

Off/On/Start switch and the left blade of the cordset

connector (see illustration below).

If continuity is present as described, proceed to #4.

If continuity is not present as described, refer to the

Wiring Diagrams and check the grinder wiring har-

ness.

4. Remove the remaining wires from the switch.

5. Check for continuity across the left terminals when

the switch is placed in both the “ON” (center) and

“START” (lower) positions. Continuity must not be

present in the “OFF” position.

If continuity is present as described, proceed to #6.

If continuity is not present as described, replace the

switch.

6. Check for continuity across the right terminals

when the switch is placed in the “START” (lower)

position only. Continuity must not be present in the

“OFF” position.

If continuity is present as described, the Off/On/Start

switch is operating properly.

If continuity is not present as described, replace the

switch.

Removal and Replacement:

1. Remove all wires from the switch terminals.

2. Compress the clips inside the front wrapper and

gently push the switch through the opening.

3. Push the new switch into the opening and spread

the clips to retain the switch in the hood.

4. Refer to the following illustration when reconnect-

ing the wires.

P594

CORDSET CONNECTOR

Looking Strait-on

Black

Ground

White

WHI/RED timer to P4-6

BLK to Cordset

BLK to timer P4-1

VIO to timer P1-2

BLU to SW2

PNK to Intf conn. 2

BLK to Cordset

WHI/RED timer to P4-6

BLK to timer P4-1

VIO to timer P1-2

BLU to SW2

PNK to Intf conn. 2

P606

FIG 29 OFF/ON/START SWITCH TERMINALS

Grinders with Digital Timer

Grinders with Analog Timer

Off/On/Start Switch (Models LPG, LPG-2E, FPG, G-1,G-2,G-3, G9, G9-2, G2 trifecta)

FIG 28 OFF/ON/START SWITCH

41545 072710

RELEASED FOR PRODUCTION

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SERVICE (Cont.)

URN

CARAFE

P1300

Location:

The Urn/Carafe switch is located to the left side on

the front of the housing above the upper inspection

panel.

Test Procedure:

1. Disconnect the grinder from the power supply.

2. Remove the tan, yellow and green wires from the

switch.

3. Place the switch in the “CARAFE” position; check

for continuity across the pink and the tan wire

terminals, also across the orange and the yellow

wire terminals.

If continuity is present as described in both checks,

proceed to step 4.

If continuity is not present as described in one or both

of the checks, replace the switch.

TAN

PNK

YEL

ORA

GRN

P1318

4. Place the switch in the “URN” position; check for

continuity across the orange and green wire ter-

minals.

If continuity is present as described, the switch is

operating properly.

If continuity is not present as described, replace

the switch.

Removal and Replacement:

1. Remove all the wires from the switch terminals.

2. Compress the clips inside the housing and gently

push the switch through the opening.

3. Push the new switch into the opening and spead

the clips to hold the switch in the housing.

4. Refer to the illustration below when reconnecting

the wires.

Urn/Carafe Switch (Models G9, G9-2)

FIG 30 URN/CARAFE SWITCH

FIG 31 URN/CARAFE SWITCH TERMINALS

P1318

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SERVICE (Cont.)

FIG 32 BATCH SELECTOR SWITCH

Location:

The batch selector switch is located on the left front

of the hopper housing.

Test Procedure:

1. Disconnect the grinder from the power source.

2. Open hopper lid and loosen four screws inside the

hopper and remove hopper.

3. The ORN wire is connected to the common terminal

"a" on the rear of the switch.

4. The TAN wire for the SMALL selection is connected

to terminal 1, the GRY wire for the MEDIUM selec-

tion is connected to terminal 2, the PNK wire for

the LARGE selection is connected to terminal 3.

5. Remove all wires from the switch terminals.

6. Set the switch in the SMALL position. Check for

continuity between terminal "a" and terminal 1.

7. Set the switch in the MEDIUM position. Check for

continuity between terminal "a" and terminal 2.

8. Set the switch in the LARGE position. Check for

continuity between terminal "a" and terminal 3.

P787

FIG 33 BATCH SELECTOR SWITCH TERMINALS

Batch Selector Switch (Model FPG)

P2947

TAN to POTENTIOMETER

GRY to POTENTIOMETER

PNK to POTENTIOMETER

ORN to TIMER

If continuity is present at all positions, the switch is

operating properly.

If continuity is not present at any position, replace the

switch.

9. Refer to the Fig. 33 when reconnecting wires.

Removal and Replacement:

1. Disconnect the grinder from the power source.

2. Remove the four 8-32 screws attaching the rear

access panel and move aside.

3. Remove all wires from the batch selector switch

terminals.

4. Loosen the setscrew on the switch knob and remove

the knob.

5. Remove the nut and lockwasher attaching the switch

to the hopper housing.

6. Remove the 6-32 screw attaching the switch to the

hopper housing.

7. Remove and discard the old switch.

8. Refer to Fig 33 when reconnecting wires.

41545 122209

RELEASED FOR PRODUCTION

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SMALL MEDIUM LARGE

P2946

SERVICE (Cont.)

FIG 34 POTENTIOMETERS

Location:

The potentiometer switches are located on the top

rear of the hopper housing.

Test Procedure:

1. Disconnect the grinder from the power source.

2. Open hopper lid and loosen four screws inside the

hopper and remove hopper.

3. Disconnect the BRN wire from the control board.

4. Disconnect the PNK, GRY, and TAN wires from the

front selector switch.

5. Connect an ohmmeter to the BRN wire. Connect

the other lead from the meter to the TAN wire.

Turn the knob for the SMALL potentiometer all the

way counterclockwise. The meter should read <3K

ohm. Turn the knob all the way clockwise, the meter

should read between 94K and 116K ohms.

6. Connect an ohmmeter to the GRY wire. Connect

the other lead from the meter to the TAN wire.

Turn the knob for the MEDIUM potentiometer all

the way counterclockwise. The meter should read

<3K ohm. Turn the knob all the way clockwise, the

meter should read between 94K and 116K ohms.

7. Connect an ohmmeter to the TAN wire. Connect

the other lead from the meter to the TAN wire. Turn

the knob for the LARGE potentiometer all the way

counterclockwise. The meter should read between

13.5K and 19.5K ohms. Turn the knob all the way

clockwise, the meter should read between 108K

and 132K ohms.

FIG 35 POTENTIOMETER TERMINALS

Potentiometer (Model FPG)

BRN to BRN WIRE

at TIMER

PNK to BATCH SELECTOR SWITCH

GRY to BATCH SELECTOR SWITCH

TAN to BATCH SELECTOR SWITCH

If continuity is present at all positions, the potentiometer

switches are operating properly.

If continuity is not present at any position, replace the

potentiometer switches.

8. Refer to Fig 35 when reconnecting wires.

Removal and Replacement:

1. Disconnect the grinder from the power source.

2. Remove the four 8-32 screws attaching the rear

access panel and move aside.

3. Disconnect three wires to the batch selector switch

and the one wire to the timer.

4. Loosen the setscrews on the switch knobs and

remove the knobs.

5. Remove the three nuts and lockwashers attaching

the switches to the rear access panel.

6. Inspect and replace the adhesive backed sponge

washers on the rear access panel if necessary.

7. Install the new potentiometer switches and tighten

the lockwashers and nuts.

8. Replace the knobs and tighten the setscrews.

9.Refer to Fig. 35 when reconnecting wires.

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SERVICE (Cont.)

Removal and Replacement:

1. Disconnect the wires from the rectiﬁer.

2. Remove the #10-32 screw securing the rectiﬁer

to the motor mounting bracket.

3. Remove the rectiﬁer and discard.

4. Install new rectiﬁer on the rear of the motor mount-

ing bracket and secure with a #10-32 screw.

5. Refer to Fig. 37 and reconnect the wires.

BLK from Motor (+)

BLU to BLU from Motor (AC)

WHI from Main Harness (AC)

RED from Motor (-)

FIG. 37 RECTIFIER TERMINALS P1381

Rectiﬁer (Models G1 MD, FPG-2 DBC)

FIG. 36 RECTIFIER P1706

Location:

The rectiﬁer is located inside the grinder housing

mounted on the rear of the motor mounting bracket

for models G1 MD and on the component mounting

bracket for model FPG-2 DBC.

Test Procedures:

1. Disconnect the grinder from the power source.

2. Remove the red wire and the black wire from the

rectiﬁer.

3. Check the voltage across the (+) and (-) termi-

nals on the rectiﬁer with a voltmeter. Connect the

grinder to the power source and start the grinder

motor. The indication must be approximately 108

volts dc.

4. Disconnect the grinder from the power source.

If voltage is present as described, the rectiﬁer is op-

erating properly.

If voltage is not present as described, refer to the

grinder wiring diagram and check the grinder wiring

harness.

41545 122209

RELEASED FOR PRODUCTION

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SERVICE (Cont.)

Location:

The relay is located on the timer bracket in the

grinder base. The bracket can be removed by loosening

the two 8-32 screws beneath the timer dial.

Test Procedure:

1. Disconnect the grinder from the power supply.

2. Check the voltage across the white/red and white/

green wires of the relay coil with a voltmeter when

the Off/On/Start switch is placed in the “START”

(right) position and released. Connect grinder to

the power supply. The indication must be:

(a) 120 volts ac for two wire 120 volt models

(b) 240 volts ac for two wire 240 volt models for

the approximate setting on the timer.

3. Disconnect the grinder from the power supply.

If voltage is present as described, reconnect the

white/red and white/green wires to the relay coil, and

proceed to step 4.

If voltage is not present as described, refer to the

Wiring Diagrams and check the grinder wiring har-

ness.

4. Remove the white/red and white/blue wires from

the relay contacts.

5. Check for continuity across the relay contacts

when the Off/On/Start switch is placed in the

“START” (right) position and released. Connect

grinder to the power supply. Continuity must

be present for the approximate setting on the

timer.

6. Disconnect the grinder from the power supply.

If continuity is present as described, reconnect the

white/red and white/blue wires, the relay is operating

properly.

If continuity is not present as described, replace

the relay.

Removal and Replacement

1. Remove all wires from the relay terminals.

2. Remove the 6-32 screw fastening the relay to the

timer bracket.

3. Mount the new relay to the timer bracket and

tighten the screw.

4. Refer to the illustration below when reconnecting

the wires.

WHI/BLU to Motor L1

WHI/GRN to Timer L4

WHI/RED to Timer TL1 P610

MINUTES

BUNN-O-MATIC

P/N 2620- 120 VAC

MINUTES

BUNN-O-MATIC

P/N 2620- 120 VAC

P1312

Single set timer shown

Multi set timer (Urn/Carafe) similar

Relay (Early Model G-9)

FIG 38 RELAY

FIG 39 RELAY TERMINALS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SERVICE (Cont.)

Location:

The relay is located on the grinder base inside the

lower housing.

Test Procedure:

1. Disconnect the grinder from the power source and

place a coffee bag behind the dispense chute.

2. Check the voltage across the white/orange and

white or red/black wires on terminals A & B of the

relay with a voltmeter. Hold the Off/On/Start switch

in the “START” (lower) position and connect the

grinder to the power source. The indication must

be:

a. 120 volts ac for two wire 120 volt models.

b. 230 volts ac for two wire 230 volt models.

c. 240 volts ac for two wire 240 volt models

3. Disconnect the grinder from the power source.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the Wiring

Diagrams and check the grinder wiring harness.

4. Remove the white/red wires from relay contacts

7 & 9.

5. Check the voltage across the white wire or red/

black on terminal B and either white/red wire with

a voltmeter. Place the Off/On/Start in either the

“ON” (center) position or “START” (lower) posi-

tion. Connect the grinder to the power source. The

indication must be:

a. 120 volts ac for two wire 120 volt models.

b. 230 volts ac for two wire 230 volt 50 Hz mod-

els.

c. 240 volts ac for two wire 240 volt 60 Hz mod-

els.

6. Disconnect the grinder from the power source.

7. Check the voltage across terminal B and the

remaining white/red wire with a voltmeter. Place

the Off/On/Start switch in either the “ON” (center)

position or “START (lower) position. Connect the

grinder to the power source. The indication must

be:

a. 120 volts ac for two wire 120 volt models.

b. 230 volts ac for two wire 230 volt 50 Hz mod-

els.

c. 240 volts ac for two wire 240 volt 60 Hz mod-

els.

8. Disconnect the grinder from the power source.

If voltage is present as described, proceed to #9.

If voltage is not present as described, refer to the Wiring

Diagrams and check the grinder wiring harness.

9. Remove the white/violet wire from terminal 6 and

white/blue wire from terminal 4.

10. Check for continuity across terminals 7 & 4.

Connect the grinder to the power source. Continu-

itymust be present when the Off/On/Start switch

is momentarily placed in the “START” (lower)

position and a bag is in place behind the coffee

dispense chute.

11. Check for continuity across terminals 9 & 6. Con-

nect the grinder to the power source. Continuity

must be present when the Off/On/Start switch

is momentarily placed in the “START” (lower)

position and a bag is in place behind the coffee

dispense chute.

12. Disconnect the grinder from the power source.

If continuity is present as described, reconnect the

wires, the relay is operating properly.

If continuity is not present as described, replace the

relay.

Relay (Models G1, G2, G3, G2 trifecta)

FIG.40 RELAY

P1704

41545 072710

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SERVICE (Cont.)

WHI/BLU from

Motor to Relay

K-4

WHI/ORN from Bag Sensor

Switch (A)

FIG. 41 RELAY TERMINALS

P1707

RELAY (cont.)

WHI to Main

Harness 120V (B)

RED/BLK to Main

Harness 240V (B)

WHI/VIO from

Switch to Relay

K-6

WHI/RED from

Switch to Relay

K-7 & K-9

Removal and Replacement (120 Volt and 240V 60 Hz

Models):

1. Remove the wires from the relay terminals.

2. Remove the two #6-32 screws securing the relay

bracket w/relay to the grinder base and remove

bracket and relay as an assembly.

3. Remove the #6-32 screw securing the relay to

the bracket and remove relay and discard.

4. Install new relay to the mounting bracket using

one #6-32 screw,

5. Mount the new relay w/bracket to the grinder

base using two #6-32 screws.

6. Refer Fig. 41 when reconnecting the wires.

120V AND 240 VOLT AC MODELS

Removal and Replacement (230 volt 50 Hz Models):

1. Remove the wires from the relay terminals.

2. Remove the two #6-32 screws securing the relay

to the grinder base.

3. Remove relay and discard.

4. Install new relay to the grinder base using two

#6-32 screw.

5. Refer Fig. 41 when reconnecting the wires.

WHI/BLU from

Motor to Relay K-4

WHI/ORN from Bag

Sensor Switch(1)

WHI to Main

Harness 120V(0)

RED/BLK to Main

Harness 240V(0)

WHI/VIO from

Switch to Relay K-6

WHI/RED from

Switch to Relay

K-2 & K-8

120 VOLT DC MODELS

WHI/BLU from

Motor to Relay

K-4

WHI/ORN from Bag Sensor

Switch (A)

WHI to Main

Harness 120V (B)

RED/BLK to Main

Harness 240V (B)

WHI/VIO from

Switch to Relay

K-6

WHI/RED from

Switch to Relay

K-7 & K-9

WHI/ORN from Bag Sensor

Switch (A)

WHI/RED from

Switch to Relay

K-7 & K-9

WHI/BLU from

Motor to Relay

K-4

WHI/VIO from

Switch to Relay

K-6

RED from Main

Harness (B)

230 VOLT AC 50 Hz MODELS

EARLY MODELS

P3696

LATE MODELS

120V AND 240 VOLT AC MODELS

120 VOLT DC MODELS

230 VOLT AC 50 Hz MODELS

WHI/BLU from

Motor to Relay K-4

WHI/ORN from Bag

Sensor Switch(1)

WHI to Main

Harness (0)

WHI/VIO from

Switch to Relay K-6

WHI/RED from

Switch to Relay

K-2 & K-8

WHI/BLU from

Motor to Relay K-4

WHI/ORN from Bag

Sensor Switch(1)

RED from Main

Harness (0)

WHI/VIO from

Switch to Relay K-6

WHI/RED from

Switch to Relay

K-2 & K-8

41545 122209

RELEASED FOR PRODUCTION

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SERVICE (Cont.)

Location:

The relay is located either on the timer bracket or on

the component mounting bracket in the grinder base.

The bracket can be removed by loosening the two 8-32

screws beneath the timer dial.

Test Procedure:

1. Disconnect the grinder from the power supply.

2. Access the relay and remove the wires from all

terminals.

3. With an ohmmeter, check for continuity between

the 0 and 1 terminals.

4. With an ohmmeter, check that there is an open

circuit between terminals 2 and 4, and between

terminals 6 and 8.

If continuity is present as described, reconnect the

wires, the relay is operating properly.

If continuity is not present as described, replace the

relay.

Relay (Models MHG, FPG-2 DBC, Late Model G-9, G9-2, G9-2 DBC)

FIG 42 RELAY

FIG 43 RELAY TERMINALS

Removal and Replacement

1. Disconnect the grinder from the power supply.

2. Remove all wires from the relay terminals.

3. Remove the two 8-32 screws attaching the relay to

the mounting bracket.

4. Refer to Fig 43 when connecting relay wires.

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SERVICE (Cont.)

Location:

The slide plates are located on the solenoid mount-

ing plate immediately beneath the hopper openings.

The slide plates must always remain ﬂat for proper

operation.

Test Procedure:

With the solenoid mounting plate attached to the

hopper, push the solenoid plunger into the coil. The

slide plate must move freely in the assembly and snap

closed when the plunger is released. Repeat for the

other slide plate.

If the slide plates move as described, they are

operating correctly.

If the slide plates do not move as described, the

problem may be in any one or more of the linkage pieces,

springs, slide plates, and/or the solenoid mounting plate.

Disassemble the solenoid mounting plate assembly and

inspect all components for free movement.

Replace if excessively worn or damaged.

A. Solenoid Coil

B. Slide Gate

C. Slide Gate Support

D. Collector

E. Collector Seal

F. Solenoid Mounting Plate

Removal and Replacement:

1. Remove the hopper from the grinder.

2. Remove six slotted head screws holding the sole-

noid mounting panel to the hopper.

3. The slide plate with attached linkage can be lifted

off the pivot pin and removed with the solenoid

plunger.

4. Refer to the illustration above when reassembling

the components.

5. Inspect the slide plates after reassembly.

They must move freely.

Hopper Slide Plates (Models MHG)

FIG 45 HOPPER SLIDE PLATES

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SERVICE (Cont.)

Left

Right

WHI/ORN to

Timer P4-4

RED/BLK to

Right Solenoid

RED/BLK to

Timer P4-7

WHI/YEL to

Timer P4-5

RED/BLK to

Left Solenoid

P612

Location:

The solenoids are located on the mounting plate

immediately beneath the hoppers.

Test Procedure:

1. Unplug the grinder.

2. Connect a voltmeter across the left or right solenoid

coil terminals. Plug-in the grinder. Momentarily

press the Off/On/Start switch to “START” (lower)

position and release (hopper selector switch must

be corresponding to the suspect solenoid). The

indication must be 120 volts ac for 120V models

and 230 volts ac for 230V models.

3. Unplug the grinder.

If voltage is present as described, proceed to #4.

If voltage is not present as described, refer to the Wiring

Diagram and check the grinder wiring harness.

4. Separate the connectors on the white/brown wires

of the solenoids from the connectors on the grinder

wiring harness (RED/BLK) and the limit thermo-

stat.

5. Check for continuity across the white/brown wires

on the suspect solenoid coil.

If continuity is present as described, reconnect the

white/brown wires to the grinder wiring harness, and

proceed to #6.

If continuity is not present as described, replace the

solenoid.

6. Check for continuity across the terminals of the

limit thermostat.

P608

If continuity is present as described, reconnect the

wires, and proceed to #7.

If continuity is not present as described, replace the

limit thermostat.

7. Check the solenoid for coil action when the control

switch is momentarily pressed to the “START”

(lower) position and released. Plug-in the grinder.

Listen carefully in the vicinity of the solenoid for

a “clicking” sound as the coil magnet attracts and

after a period of time, repels the plunger.

8. Unplug the grinder.

If the sound is heard as described and the plunger

remains unable to move or move freely, refer to the

slide plate section.

If the sound is not heard as described, replace the

solenoid.

Removal and Replacement:

1. Remove the hopper assy from the grinder.

2. Remove the four 8-32 slotted-head screws holding

the solenoid coil to the solenoid panel.

3. Feed the white/brown wires through the hole in the

solenoid mounting plate and loosely install the new

solenoid coil.

4. Look through the collector on the bottom of the

assy and adjust the slide plate travel distance when

installing the solenoid coil.

5. Push the solenoid plunger into the solenoid coil

with your hand while moving the coil forward or

backward in its mounting holes.

6. Securely tighten the mounting screws when the

slide plate appears to have no metal showing in

the front or back of the hopper hole.

7. Refer to the following illustration when reconnect-

ing the wires.

Solenoids (Models MHG, FPG-2 DBC, LPG-2, G9-2, G9-2 DBC)

FIG 46 SOLENOIDS

FIG 47 SOLENOID TERMINALS

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SERVICE (Cont.)

Timer (Model LPG-2E)

P1061

Location:

The timer is located inside the hopper housing just

behind the left solenoid.

Test Procedure:

1. Disconnect grinder from the power source.

2. Insert the leads of a voltmeter set to read at least

120 volts AC, along side the red wire (terminal 8)

and the white wire (terminal 2) of the harness plug.

Place the Off/On/Start switch in the “ON” center

position. Connect the grinder to the power source.

The indication must be 120 volts AC.

3. Disconnect the grinder from the power source.

If voltage is present as described, proceed to step

#4.

If voltage is not present as described, refer to the wiring

diagram and check the grinder wiring harness.

4. Place the hopper selector switch in the left posi-

tion.

5. Insert the leads of a voltmeter set to read at least

120 volts AC, along side the red wire (terminal 8)

and the orange wire (terminal 10) of the harness

plug. Place the Off/On/Start switch in the “START”

lower position. Connect the grinder to the power

source. The indication must be 120 volts AC for the

set gate time and return to 0 volts.

6. Disconnect the grinder from the power source.

FIG. 48 TIMER

If voltage is present as described, proceed to step

#7.

If voltage is not present as described, replace the

timer.

7. Place the hopper selector switch in the right posi-

tion.

8. Insert the leads of a voltmeter set to read at least

120 volts AC, along side the red wire (terminal 8)

and the violet wire (terminal 9) of the harness plug.

Place the Off/On/Start switch in the “START” lower

position. Connect the grinder to the power source.

The indication must be 120 volts AC for the set gate

time and return to 0 volts.

9. Disconnect the grinder from the power source.

If voltage is present as described, proceed to

step#10.

If voltage is not present as described, replace the

timer.

10. Insert the positive (+) lead of a volt meter set to read

at least 120 volts DC, along side the black wire (ter-

minal 7) of the harness plug and insert the negative

(-) lead along side the white/black wire (terminal 6)

of the harness plug. Place the Off/On/Start switch

in the “START” lower position. Connect the grinder

to the power source. The indication must be 120

volts DC for the set gate time plus clean out time

and return to 0 volts.

If voltage is present as described the timer is operating

properly.

If Voltage is not present as described, replace the

timer.

Removal and Replacement:

1. Disconnect the main wiring harness plug from the

terminal block on the timer.

2. Remove the two timer dial knobs located on the

rear panel of the grinder.

3. Remove nut and internal tooth lockwasher securing

dials to the rear panel.

4. Loosen the two #8-32 pan head screws securing

the timer and timer mounting bracket to the motor

support plate.

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SERVICE (Cont.)

Timer (Model LPG-2E)

Timer (Models LPG, FPG)

P1748

FIG. 49 TIMER

Location:

The timer is located inside the rear access panel.

Adjustments can be made by removing the 2” hole

plug.

Test Procedure:

1. Disconnect grinder from the power source.

2. Insert the leads of a voltmeter set to read at least

120 volts AC, along side the red wire (terminal 1)

and the white/black wire (terminal 2) of the harness

plug. Place the Off/On/Start switch in the “ON”

center position. Connect the grinder to the power

source. The indication must be 120 volts AC for

120 volt models, 100 volts for 100 volt models,

and 230 volts for 230 volt models.

3. Disconnect the grinder from the power source.

If voltage is present as described, proceed to step

#4.

If voltage is not present as described, refer to the wiring

diagram and check the grinder wiring harness.

4. Insert the positive (+) lead of a volt meter set to

read at least 120 volts DC (157 volts DC on units

with capacitor), along side the black wire (terminal

3) of the harness plug and insert the negative (-)

lead along side the white wire (terminal 6) of the

harness plug. Place the Off/On/Start switch in the

“START” lower position. Connect the grinder to the

power source. The indication must be 120 volts DC

for 120 volt models (157 volts DC on units with

capacitor), 100 volts for 100 volt models, and 230

volts for 230 volt models for the set time and return

to 0 volts.

5. Disconnect the grinder from the power source.

If voltage is present as described the timer is operating

properly.

If Voltage is not present as described, replace the

timer.

5. Remove timer and timer mounting bracket from

the grinder.

6. Remove the four #6-32 keps nuts securing the timer

to the mounting bracket. Leave the four spacers on

the mounting bracket studs.

7. Place new timer over the studs on the mounting

bracket and secure with four #6-32 keps nuts.

8. Slip timer and timer mounting bracket under the

two screws on the motor support plate and tighten

screws.

9. Locate the left and right timer dials in their proper

place on the rear panel and secure with nuts and

internal tooth lockwashers.

10. Place timer knobs on timers.

11. Reconnect harness plug to the terminal block on

the timer board.

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SERVICE (Cont.)

Location:

The timer is located on the timer bracket in the

grinder base. The bracket can be removed by loosening

the two 8-32 screws beneath the timer dial(s).

Test Procedure:

1. Disconnect the grinder from the power supply.

2. Check the voltage across terminals TL1 & TL2 with

a voltmeter when the “Off/On/Start switch is placed

in the “START” (right) position and released. Con-

nect grinder to the power supply. The indication

must be:

(a) 120 volts ac for two wire 120 volt models.

(b) 240 volts ac for two wire 240 volt models.

3. Disconnect the grinder from the power supply.

If voltage is present as described, proceed to step 4.

If voltage is not present as described, refer to the Wiring

Diagram and check the grinder wiring harness.

4. Remove the white/orange and white/yellow wires

from terminals TL3 & TL5.

5. Check for continuity across the white/orange and

white/yellow wires when the Off/On/Start switch

is placed in the “START” (right) position.

If continuity is present as described, reconnect the

white/orange wire to terminal TL3 and the white/yellow

wire to terminal TL5, and proceed to step 6.

If continuity is not present as described, refer to the Wir-

ing Diagram and check the grinder wiring harness.

6. Check the voltage across terminals TL1 and TL4

with a voltmeter when the Off/On/Start switch

is placed in the “START” (right) position and

released. Connect grinder to the power supply.

The indication must be:

(a) 120 volts ac for two wire 120 volt models.

(b) 240 volts ac for two wire 240 volt models.

7. Disconnect the grinder from the power supply.

If voltage is present as described, the timer is operating

properly. Refer to the Adjustments section to vary the

amount dispensed.

If voltage is not present as described, replace the

timer.

Removal and Replacement:

1. Remove all wires from the timer terminals.

2. Remove the four 6-32 screws and nuts holding the

circuit board to the timer bracket.

3. Remove the two 6-32 screws and nuts holding the

dial plate to the timer bracket.

4. Install the new dial plate and circuit board to the

timer bracket.

5. Refer to the illustration below when reconnecting

the wires.

6. Refer to the Adjustments section to vary the amount

dispensed.

MINUTES

BUNN-O-MATIC

P/N 2620- 120 VAC

MINUTES

BUNN-O-MATIC

P/N 2620- 120 VAC

MINUTES

BUNN-O-MATIC

P/N 2620- 120 VAC

WHI/RED to Relay N.O.

WHI/RED to

Off/On/Start Switch

WHI to Cordset (120 v)

RED/BLK to Cordset (240 v)

WHI/ORA to

Off/On/Start Switch

WHI/GRN to Relay Coil

WHI/YEL to

Off/On/Start Switch

P1312

P1313

Single set timer shown

Multi set timer (Urn/Carafe) connections are the same

Single set timer shown

Multi set timer (Urn/Carafe) similar

Timer (Model G9)

FIG 50 TIMER

FIG 51 TIMER TERMINALS

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SERVICE (Cont.)

DISPENSE TIME (Seconds)

DISPLAY

IncreaseDecrease

Readout will be displaye d for 5 minutes.

Timer can only be adjus ted

while readout is d isplayed.

WARN ING

HAZARDOUS VOLTAGE

UNPLUG GRINDER

BEFORE REMOVING

RIGHT

DISPENSE TIME

(SECONDS)

3.2

15 20

3.2

.4.4

15 20

LEFT

HIGH

UNPLUG GRINDER

BEFORE REMOVING

WARN ING

HAZARDOUS VOLTAGE

HIGH

LOWLOW

OFF

Location:

The timer is located in the grinder base.

Test Procedure:

1. Unplug the grinder.

2. Connect a voltmeter across contacts 1 & 2 of the

larger connector (P4) on the timer board. Plug-in

the grinder. The indication must be 120 volts ac for

120V models and 230 volts ac for 230V models.

3. Unplug the grinder.

4. Connect a voltmeter across contacts 2 & 6 of the

larger connector (P4) on the timer board. Plug-in

the grinder. When the control switch is in any posi-

tion except “OFF” (center), the indication must be

120 volts ac for 120V models and 230 volts ac for

230V models.

5. Unplug the grinder.

If voltage is present as described, proceed to #6.

If voltage is not present as described, refer to the Wiring

Diagram and check the grinder wiring harness.

P613

Digital Timer

Analog Timer

6. Connect a voltmeter across contacts 3 & 7 of the

larger connector (P4) on the timer board. Plug-in

the grinder. Momentarily press the Off/On/Start

switch to “START” (lower) position and release. The

indication must be 120 volts ac for 120V models

and 230 volts ac for 230V models.

7. Unplug the grinder.

If voltage is present as described, proceed to #8.

If voltage is not present as described, replace the

timer.

8. Connect a voltmeter across contacts 4 & 7 of the

larger connector (P4) on the timer board. Plug-in

the grinder. Place the hopper selector switch to

the left position. Momentarily press the Off/On/

Start switch to the “START” (lower) position and

release. The indication must be 120 volts ac for

120V models and 230 volts ac for 230V models and

should remain for the approximate timer setting.

9. Unplug the grinder.

If voltage is present as described, proceed to #10.

If voltage is not present as described, replace the

timer.

10. Connect a voltmeter across contacts 5 & 7 of the

larger connector (P4) on the timer board. Plug-in

the grinder. Place the hopper selector switch to

the right position. Momentarily press the Off/On/

Start switch to the “START” (lower) position and

release. The indication must be 120 volts ac for

120V models and 230 volts ac for 230V models and

should remain for the approximate timer setting.

11. Unplug the grinder.

If voltage is present as described, the timer is operat-

ing properly.

If voltage is not present as described, replace the

timer.

Removal and Replacement:

1. Separate the grinder wiring harness connectors

from the timer circuit board.

2. Remove the relay from the timer bracket.

3. Attach the relay to the new timer bracket.

4. Refer to the following illustration when reattaching

the connectors.

5. Refer to the Adjustments section to reset the vol-

ume dispensed.

Timer (Model G9-2)

FIG 52 TIMER

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SERVICE (Cont.)

Control Board (Model MHG)

Location:

The control board is located on the component

mounting bracket mounted to the grinder base inside

the front access panel. The bracket can be removed by

loosening the two 8-32 screws securing the bracket to

the grinder base.

Test Procedure:

1. Press and hold the upper right hidden button to

enter the Programming menus.

2. Scroll to SERVICE TOOLS menu, and press the

button under "YES".

3. Press "YES" under TEST OUTPUTS and

proceed,through the menus to test the left and

right gates, and the grinder motor.

4. Then scroll to the TEST FREQUENCY menu and

press the button under "YES".

5. Observe the left, right and center frequency

screens, they should read between 124.0 and

126.0 khz.

6. Should any of the outputs or frequency tests fail,

ﬁrst check the continuity of the wiring between the

component and the control board. Then test the

individual component before replacing the control

board.

FIG 53 CONTROL BOARD

FIG 54 CONTROL BOARD TERMINALS

Removal and Replacement

1. Disconnect the grinder from the power supply.

2. Remove the front access panel.

3. Remove all wires from the control board termi-

nals.

4. Remove the bracket and control board by remov-

ing the two 8-32 screws securing the bracket to

the grinder base.

5. Remove the six 8-32 screws attaching the control

board the the component bracket.

6. Remove the six spacers from the old control board

and discard the control board.

7. Install the six spacers to the new control board

8. Attach the control board to the component bracket

using the six screws previously removed.

9. Position the bracket and control board assembly

in the grinder base and secure with the two 8-32

screws.

10. Reconnect the wires to the control board.

J12

J16 J8

MOV4

TH3

MOV3

TH2

MOV1

MOV2

TH1

J13

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SERVICE (Cont.)

Control Board (Models FPG-2 & G9-2 DBC)

Location:

The control board is located inside the hopper

housing behind the membrane switch.

Test Procedure:

1. Check the continuity of the wiring between the

component and the control board.

2. Test the individual components before replacing

the control board.

FIG 55 CONTROL BOARD FIG 56 CONTROL BOARD TERMINALS

Removal and Replacement

1. Disconnect the grinder from the power supply.

2. Remove the rear access panel.

3. Disconnect all harness plugs from the control

board.

4. Remove the two knurled nuts from the bottom of

the control board and remove the control board.

5. Refer to Fig 56 when connecting wires.

MOV4

MOV3

MOV2

MOV1 TH1

J10 J7

TH2

TH3

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SERVICE (Cont.)

Membrane Switches (Model MHG only)

Location:

The membrane switch is located on the front of the

hopper housing.

Test Procedure:

1. Press and hold the right hidden button to enter

programming.

2. Scroll through the menus to Service Tools and

select YES.

3. Select YES at Test Outputs and scroll through to

Test Switches by pressing NEXT.

4. Follow the chart below to test all switches.

If any of the switches indicate a fault, replace the

membrane switch.

FIG 57 MEMBRANE SWITCH

PRESSING ANY BUTTON

EXCEPT THE RIGHT HIDDEN

BUTTON WILL DISPLAY

THE BUTTON NAME

ON THE SCREEN

TEST SWITCHES?

NO YES

PRESS RIGHT

HIDDEN TO EXIT

NOTHING PRESSED

TEST FREQUENCY?

NO YES

Removal and Replacement

1. Disconnect the grinder from the power supply.

2. Remove the rear access panel.

3. Disconnect the membrane switch harness from the

control board.

4. Carefully peel the membrane switch from the front

of the switch bezel.

5. Remove any excess adhesive from the bezel sur-

face.

6. Remove the backing from the new membrane

switch.

7. Feed the membrane switch harness through the

openning and apply the new membrane switch to

the switch bezel.

8. Connect the switch harness to J9 on the display

board.

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PERSONAL INJURY

HAZARD.

KEEP FINGERS AND

FOREIGN OBJECTS

OUT OF HOPPER

OR CHUTE OPENING.

CAUTION

SERVICE (Cont.)

Membrane Switches (Models FPG-2 & G9-2 DBC)

Location:

The membrane switch is located on the front of the

hopper housing.

Test Procedures:

NOTE: Before continuing, check that the ribbon cable

is properly connected to the control board and not a

pin off in either direction.

1. Disconnect the dispenser from the power source.

2. Remove the rear panel and disconnect ribbon

cable.

3. Check for continuity of the switches using pin #1as

common.

FIG 58 MEMBRANE SWITCH

FIG 59 MEMBRANE SWITCH

Removal and Replacement

1. Disconnect the grinder from the power supply.

2. Remove the rear access panel.

3. Disconnect the membrane switch harness from the

control board.

4. Carefully peel the membrane switch from the front

of the switch bezel.

5. Remove any excess adhesive from the bezel sur-

face.

6. Remove the backing from the new membrane

switch.

7. Feed the membrane switch harness through the

openning and apply the new membrane switch to

the switch bezel.

8. Connect the switch harness to the control board.

SHIELD

SWITCH UNIT ASSY

A1 - #5 Grind

A2 - #6 Stop

B2 - #10 Hidden Button "Right"

C1 - #2 Large Batch Size "Left"

C2 - #3 Medium Batch Size "Left"

C3 - #4 Small Batch Size "Left"

C4 - #9 Large Batch Size "Left"

C5 - #8 Medium Batch Size "Left"

C6 - #7 Small Batch Size "Left"

- #1 Nuetral

If continuity is not present when the appropriate switch

is pressed, the Membrane Switch must be replaced.

If continuity is present, chech the short harness going

to J6 on the Control Board.

To Control Board J6

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SERVICE (Cont.)

EMI Filter (Models FPG & FPG-2)

FIG 60 EMI FILTER

FIG 61 EMI FILTER TERMINALS

Location:

The EMI Filter is located inside the rear cover of the

grinder housing.

Test Procedure:

1. Disconnect the dispenser from the power source.

2. Disconnect the two red wires and two white wires on

the EMI Filter from the EMI Filter wiring harness.

3. Check for resistance between the two red leads on

the EMI Filter. (Fig 61)

If resistance is present as described the EMI Filter is

operating properly.

If resistance is not present as described, replace the

EMI Filter.

Removal and Replacement:

1. Disconnect the wires from the EMI Filter.

2. Remove the two screws securing the EMI Filter.

3. Remove and discard EMI Filter.

4. Install new EMI Filter using two screws to secure

EMI Filter to its former location.

5. Refer to schematic when reconnecting the wires.

118.0 kΩ - 118.5 kΩ

Across either pair

GRINDER DBC

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SERVICE (Cont.)

Funnel Sensing Coil (Models MHG & G9-2 DBC)

Location:

The funnel sensing coil is located inside of the coil

cover.

Test Procedure:

1. Disconnect the grinder from the power supply.

2. Remove the two 6-32 screws attaching the coil

cover to the front of the grinder housing.

3. Pull slightly away from the housing and disconnect

the two wires from the coil.

4. With an ohmmeter, measure the resistance across

the pin terminals of the coil. The reading should be

5 to 7 ohms.

If this amount of resistance is not present, replace the

funnel sensing coil.

FIG 62 FUNNEL SENSING COIL

FIG 63 FUNNEL SENSING COIL TERMINALS

Removal and Replacement

1. Disconnect the grinder from the power supply.

2. Remove the two 6-32 screws attaching the coil

cover to the grinder housing.

3. Pull slightly away from the housing and disconnect

the two wires from the coil.

3. Remove the coil from the coil cover.

4. Place the new coil into the coil cover and attach the

two wires previously removed.

5. Secure cover with two 6-32 screws.

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SERVICE (Cont.)

Memory Clock Board (Model MHG)

Location:

The memory clock board is located on the component

mounting bracket mounted to the grinder base inside

the front access panel.

Test Procedure:

1. Disconnect the grinder from the power supply.

2. Disconnect the wiring harness on the memory

board.

3. Check for 5VDC on J1-4 and J1-5.

If voltage is not present as described the memory board

is operating properly.

If voltage is present as described, replace the memory

board.

FIG 64 MEMORY CLOCK BOARD

Removal and Replacement

1. Disconnect the grinder from the power supply.

2. Remove the front access panel.

3. Remove the two 8-32 screws securing the compo-

nent bracket to the grinder base and tilt forward to

gain access to the memory clock board.

5. Disconnect the harness from the memory clock

board.

6. Remove the two 6-32 nuts attaching the memory

clock board to the component bracket.

7. Remove the two spacers from the old board and

attach to the new board.

8. Install new memory board using two #6-32 nuts

to secure board to the component bracket.

9. Refer to Fig. 65 when reconnecting the wires.

FIG. 65 MEMORY CLOCK BOARD CONNECTORS

MEMORY

BOARD

GRN

WHI

RED

BLK

+5VDC

J1-1

J1-5

J16-1

J16-5

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Display Board (Model MHG)

Location:

The display board is located inside the hopper

housing behind the membrane switch.

Test Procedure:

1. Press and hold the upper right hidden button to

enter the Programming menus.

2. Scroll to SERVICE TOOLS menu, and press the

button under "YES".

3. Press "YES" under TEST OUTPUTS and proceed,

through the menus to test the left and right gates,

and the grinder motor.

4. Then scroll to the TEST SWICHES menu and press

the button under "YES". Test each button on the

conttrol panel, the button pressed will be displayed

on the screen.

SERVICE (Cont.)

FIG 66 DISPLAY BOARD

FIG 67 DISPLAY BOARD TERMINALS

Removal and Replacement

1. Disconnect the grinder from the power supply.

2. Remove the two 6-32 screws attaching the mem-

brane switch bezel to the hopper housing.

3. Tilt the bezel assembly forward.

4. Remove the four 8-32 screws attaching the board

cover bracket to the switch bezel and remove the

bracket.

5. Disconnect the wiring harness from the display

board.

6. Remove the four 8-32 screws attaching the display

board to the switch bezel and remove the board.

J9-10

J9-15

J9-5

J9-1

DISPLAY BOARD

J10-4

J10-1

ORN

YEL

GRN

BLU

J9-1 16

To Control Board J8

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TRIAC MAP for MHG

MOV1 controls Transformer @ J5-4,5,6

TH1 & MOV2 controls Left Gate @ J5-3

TH2 & MOV3 controls Relay @ J5-2

TH3 & MOV4 controls Right Gate @ J5-1

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TRIAC MAP for FPG-2 DBC and G9-2 DBC

TH1 & MOV1 controls Left Gate @ J1-1

TH2 & MOV2 controls Relay @ J1-2

TH3 & MOV3 controls Right Gate @ J1-3

MOV4 controls Transformer @ J1-4,5,6

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SCHEMATIC WIRING DIAGRAM

G9-2 DBC, G9-2T DBC W/SMART FUNNEL®N

LEFT GATE LIMIT THERMOSTAT

LIMIT THERMOSTAT

SOL

WHI/ORA

WHI/GRN

WHI/YEL

BLK

WHI

RED/BLK J1-6

J1-6

J8-3

J8-1

J6-10

J6-5

J6-1

CONTROL PC BOARD

COIL

RELAY

RIGHT GATE

SHIELD

FUNNEL SENSOR

WHI/GRN

WHI/VIO

SWITCH UNIT ASSY

GRINDER MOTOR

Models with RUN capacitor

START

CAPACITOR

RUN

CAPACITOR

WHI

BLK

WHT

RED

GRY

WHI/BLU

RELAY

CONTACTS

Switch Unit Assembly Codes

A1 Grind

A2 Stop

B2 Hidden Button "Right"

C1 Large Batch Size "Left"

C2 Medium Batch Size "Left"

C3 Small Batch Size "Left"

C4 Large Batch Size "Right"

C5 Medium Batch Size "Right"

C6 Small Batch Size "Right"

120 OR 220-240

VOLTS AC 2 WIRE

SINGLE PHASE

50/60 HZ

WIRING DIAGRAMS

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SCHEMATIC WIRING DIAGRAM

G9-2 DBC, G9-2T DBC W/SMART FUNNEL™ N

LEFT GATE LIMIT THERMOSTAT

LIMIT THERMOSTAT

SOL

WHI/ORA

WHI/GRN

WHI/YEL

BLK

WHI

RED/BLK J1-6

J1-6

J8-3

J8-1

J6-10

J6-5

J6-1

CONTROL PC BOARD

COIL

RELAY

RIGHT GATE

SHIELD

FUNNEL SENSOR

WHI/GRN

WHI/VIO

SWITCH UNIT ASSY

GRINDER MOTOR

M WHI

BLK WHI/BLU

RELAY

CONTACTS

120 OR 230 VOLTS AC

2 WIRE

SINGLE PHASE

50/60 HZ

Switch Unit Assembly Codes

A1 On/Off

A2 Grind

A3 Stop

B2 Hidden Button “Right”

C2 Hot Coffee “Full”

C3 Hot Coffee “Half”

C5 Iced Coffee

WIRING DIAGRAMS

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DIR Num: 41545.0000 20, January 2015

SCHEMATIC WIRING DIAGRAM

G9-2TB DBC W/SMART FUNNEL®

LEFT GATE LIMIT THERMOSTAT

LIMIT THERMOSTAT

SOL

WHI/ORA

WHI/GRN

WHI/YEL

BLK

WHI

RED/BLK J1-6

J1-6

J8-3

J8-1

J6-10

J6-5

J6-1

CONTROL PC BOARD

COIL

RELAY

RIGHT GATE

SHIELD

FUNNEL SENSOR

WHI/GRN

WHI/VIO

SWITCH UNIT ASSY

WHI

BLK WHI/BLU

RELAY

CONTACTS

Switch Unit Assembly Codes

A1 Grind

A2 Stop

A3 On/Off

C1 Large Batch Size "Left"

C2 Medium Batch Size "Left"

C3 Small Batch Size "Left"

C4 Large Batch Size "Right"

C5 Medium Batch Size "Right"

C6 Small Batch Size "Right"

100 VOLTS AC

2 WIRE

SINGLE PHASE

50 HZ GRINDER MOTOR

START

CAPACITOR

RUN

CAPACITOR

WHT

RED

GRY

Models with RUN capacitor

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

SCHEMATIC WIRING DIAGRAM MHG

RIGHT GATE

LEFT HOPPER SENSOR

LIMIT

THERMOSTAT

LIMIT

THERMOSTAT

WHI/YEL WHI/YEL

WHI/GRN

WHI/ORN WHI/ORN

YEL

ORN

YEL

ORN

BLK

WHI WHI

WHI

J5-5

J5-1

J12-1

J9-10

J9-5

J9-1

CONTROL PC BOARD

DISPLAY BOARD

RELAY

LEFT GATE

RIGHT HOPPER SENSOR

STATIC SHIELD

SWITCH UNIT ASSY

GRINDER MOTOR

WHI

BLK WHI/BLU

RELAY

CONTACTS

100 VOLTS AC,

120 VOLTS AC,

240 VOLTS AC

2 WIRE

SINGLE PHASE

50/60 HZ

Switch Unit Assembly Codes

A1 Grind

A2 Stop

B1 Hidden Button "Left"

B2 Hidden Button "Right"

C1 Large Batch Size "Left"

C2 Medium Batch Size "Left"

C3 Small Batch Size "Left"

C4 Large Batch Size "Right"

C5 Medium Batch Size "Right"

C6 Small Batch Size "Right"

D1 "Digital" Left Hidden Button

D2 "Brewer" Center Hidden Button

D3 "Control" Right Hidden Button

FUNNEL SENSOR

VIO

J10-4

J10-1

J8-4

J8-1

ORN

YEL

GRN

BLU

SOL

COIL

GRN

J16-5

J16-1

MEMORY

BOARD

RED

WHI

GRN

BLK

P1, P2, P3 & P4 ARE

PINS OF A POLARIZED

FOUR-PIN CONNECTOR

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

WIRING DIAGRAMS

1 5 10 16

J19

J12

STATIC

SHIELD

SWITCH UNIT ASSY

RIGHT HOPPER

COIL

LEFT HOPPER

COIL

FUNNEL COIL

LOAD

LINE

VIO

ORG

YEL

RIGHT GATE RELAY

LEFT GATE RELAY

LI N

SOL

LIMIT

THERMOSTAT

LIMIT

THERMOSTAT

RIGHT GATE

LEFT GATE

WHT

WHT/ORG WHT/ORGWHT

WHT WHT/YEL WHT/YEL

BLK

WHT/BLU

WHT

GRN

CONTROL PC BOARD

MOTOR RELAY

BLK

WHT

RED

VIO

YEL

ORG

GRY

GRY VIO

ORG

YEL

SWITCH UNIT ASSEMBLY CODES

A1 GRIND

A2 STOP

B1 HIDDEN BUTTON "LEFT"

B2 HIDDEN BUTTON "RIGHT"

C1 LARGE BATCH SIZE "LEFT"

C2 MEDIUM BATCH SIZE "LEFT"

C3 SMALL BATCH SIZE "LEFT"

C4 LARGE BATCH SIZE "RIGHT"

C5 MEDIUM BATCH SIZE "RIGHT"

C6 SMALL BATCH SIZE "RIGHT"

D1 "DIGITAL' LEFT HIDDEN BUTTON

D2 "BREWER" CENTER HIDDEN BUTTON

D3 "CONTROL" RIGHT HIDDEN BUTTON

100 VOLTS AC, 120 VOLTS AC,

240 VOLTS AC

2 WIRE + Gnd

SINGLE PHASE, 50/60HZ

SCHEMATIC WIRING DIAGRAM

MHG with WD CBA

White Strip-Tac Plus

Black Ink

Finished Size: 4.0" x 4.25"

50% Reduction

EMI

FILTER

GRINDER MOTOR

START

CAPACITOR

RUN

CAPACITOR

WHT

RED

GRY

Models with RUN capacitor

41545 110714

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

BUNN-O-MATIC CORPORATION

SCHEMATIC WIRING DIAGRAM

LPG-2E, LPGB-2E N

BLK

RED

WHI

100 VOLTS AC

120 VOLTS AC

2 WIRE

SINGLE PHASE

60 HZ

GRN

AMP

TIMER ASSY.

(Hopper Slide

Gate Timer

Dial Wiring)

Right - Brown

Left - Orange

YEL

WHI

BLU

YEL

WHI/BLK

BLK

RED

VIO

ORA

OFF/ON/START

SWITCH

RED

GRN

SELECTOR

SWITCH WHI

RED

WHI

BLK GRINDER

SLIDE GATES

SOL

RED RED

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

BLK

WHI

RED

BUNN-O-MATIC CORPORATION

SCHEMATIC WIRING DIAGRAM

LPG & LPG2

NL1

RED

WHI/BLK

BLK

WHI/BLU

WHI/BRN

WHI

GRN

RED

WHI/BLK

BLK

WHI/BLU

WHI/BRN

WHI

BLK

RED

WHI/BRN

WHI/BLU

P2 BLK

RED

WHI/BRN

WHI/BLU

MOTOR

BLK

WHI

RED

RED 4

GREEN

AMP

TIMER

BLK

120 VOLTS AC

2 WIRE

SINGLE PHASE

60 HZ

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

BLK

WHI

RED

BUNN-O-MATIC CORPORATION

SCHEMATIC WIRING DIAGRAM

LPG-A

L2L1

RED

WHI/BLK

BLK

WHI/BLU

WHI/BRN

WHI

GRN

RED

WHI/BLK

BLK

WHI/BLU

WHI/BRN

WHI

BLK

RED

WHI/BRN

WHI/BLU

P2 BLK

RED

WHI/BRN

WHI/BLU

MOTOR

BLK

WHI

RED

RED 4

GRN/YEL

AMP

TIMER

BLK

230 VOLTS AC

2 WIRE

SINGLE PHASE

50/60 HZ

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

BLK

WHI

RED

BUNN-O-MATIC CORPORATION

SCHEMATIC WIRING DIAGRAM

LPG W/Capacitor

RED

WHI/BLK

BLK

WHI/BLU

WHI/BRN

WHI

GRN

RED

WHI/BLK

BLK

WHI/BLU

WHI/BRN

WHI

BLK

RED

WHI/BRN

WHI/BRN WHI/BRN

WHI/BLU

P2 BLK

RED

WHI/BRN

WHI/BLU

MOTOR

BLK

WHI

RED

RED 4

GREEN

TIMER

BLK BLK

120 VOLTS AC 2 WIRE

SINGLE PHASE 60 HZ

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

BLK

WHI

RED

BUNN-O-MATIC CORPORATION

SCHEMATIC WIRING DIAGRAM

LPG-B

NL1

RED

WHI/BLK

BLK

WHI/BLU

WHI/BRN

WHI

GRN

RED

WHI/BLK

BLK

WHI/BLU

WHI/BRN

WHI

BLK

RED

WHI/BRN

WHI/BLU

P2 BLK

RED

WHI/BRN

WHI/BLU

MOTOR

BLK

WHI

RED

RED 4

GREEN

AMP

TIMER

BLK

100 VOLTS AC

2 WIRE

SINGLE PHASE

50-60 HZ

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

WHI/VIO

WHI/BLU

WHI/ORA

1 or A

GRN or GRN/YEL230V GRN/YEL

L1 N

SW1

BLK WHI/RED

SW2

0 or B

L1 L2

100 VOLT AC

120 VOLT AC

230 VOLT AC

240 VOLT AC

2 WIRE + GRD

SINGLE PHASE

50/60 HZ WHI

WHI

RED/BLK

K-2 or K-7

K-8 or K-9

K-6

K-4

White Strip-Tac Plus

Black Ink

Finished Size: 6" x 3"

~100% Reduction

SCHEMATIC WIRING DIAGRAM G1, G2, G3 & G2 trifecta

WIRING DIAGRAMS

41545 072710

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

WHI/GRN

BLK

WHI/BLU ML2L1

120 VOLTS AC

2 WIRE

SINGLE PHASE

60 HZ

L1 N

GREEN

K1 N.O.

SCHEMATIC WIRING DIAGRAM G9

TIMER

WHI/RED

WHI/YEL

WHI/ORA

WHI

WHI/RED

OPTIONAL KEY SW

54321

ORA URN CARAFE

WHI/GRN

BLK

WHI/BLU ML2L1

120 VOLTS AC

2 WIRE

SINGLE PHASE

60 HZ

L1 N

GREEN

K1 N.O.

SCHEMATIC WIRING DIAGRAM

G9-URN/CARAFE

TIMER

3245

WHI/RED

WHI/YEL

WHI/ORA

WHI

WHI/RED

TAN

MULTI-SET SW

(OPTIONAL)

GRN

YEL

BRN

ORA

GRN

YEL

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

WHI/GRN

BLK

WHI/BLU ML2L1

230 VOLTS AC

2 WIRE + GND

SINGLE PHASE

50 HZ

L1 L2

GREEN

K1 N.O.

SCHEMATIC WIRING DIAGRAM G9A HD

TIMER

WHI/RED

WHI/YEL

WHI/ORA

RED/BLK

WHI/RED

54321

OPTIONAL POWER

INDICATOR LIGHT

WIRING DIAGRAMS

41545 072710

BLK WHT

RED

VIO

BLK BLK

VIOVIO

K1 N.O.

BLK

WHT

L1 N/L2

L1 L2

1 4

CONTROL CIRCUIT BOARD

LOAD

TRANSDUCER

BLK

GRN

WHT

RED

GRN

SCHEMATIC WIRING DIAGRAM G9WD-RH

120 or 220-240 VOLTS AC

2 WIRE

SINGLE PHASE

50/60 HZ

BLK

VIO

LINE

LOAD

WHTBLK

RED

1 2

4 5

YEL

BLK

WHT

J13

1 5 10 16

FUNNEL

BrewWISE Models only

SENSOR

J12

1 5

VIO

Black Ink

Finished Size: 5.5" x 6.0"

~ 50% Reduction

White Strip-Tac Plus

A1 GRIND

A2 STOP

B1 HIDDEN BUTTON "LEFT"

B2 HIDDEN BUTTON "RIGHT"

C1 LARGE BATCH SIZE "LEFT"

C2 MEDIUM BATCH SIZE "LEFT"

C3 SMALL BATCH SIZE "LEFT"

D1 "DIGITAL' LEFT HIDDEN BUTTON

D2 "BREWER" CENTER HIDDEN

D3 "CONTROL" RIGHT HIDDEN

GRINDER MOTOR

START

CAPACITOR

RUN

CAPACITOR

WHT

RED

GRY

Models with RUN capacitor

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

4 3

WHI/GRN

BLK

WHI/BLU

120 VOLTS AC

2 WIRE

SINGLE PHASE

60 HZ

L1 N

GREEN

K1 N.O.

SCHEMATIC WIRING DIAGRAM G9

TIMER

3 2 4 5

WHI/RED

WHI/YEL

WHI/ORA

WHI

WHI/RED

GRY

1 2

OPTIONAL

MULTI-SET SW

OPTIONAL BREWER

INTERFACE CONNECTOR

PNK

TAN

ORA

PNK

OPTIONAL KEY SW

120 VOLTS AC

2 WIRE

SINGLE PHASE

60 HZ

4 3

WHI/GRN

BLK

WHI/BLU M

L2 L1

L1 N

GREEN

K1 N.O.

SCHEMATIC WIRING DIAGRAM G9

TIMER

3 2 4 5

WHI/RED

WHI/YEL

WHI/ORA

WHI

WHI/RED

GRY

1 2

OPTIONAL BREWER

INTERFACE CONNECTOR

PNK

TAN

OPTIONAL KEY SW

WHI/ORA

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

BLU

VIO

YEL

GRY

TAN

ORA

RED/BLK

WHI

WHI/GRN

WHI/ORA

WHI/YEL

RED/BLK

BLK

WHI/RED

WHI/BLU ML2L1

WHI/BLU

WHI/BLK

YEL

230 VOLTS AC

2 WIRE

SINGLE PHASE

50 HZ

L1 L2

K1 N.O.

SCHEMATICWIRINGDIAGRAMG9-2A HD

OFF/ON/START

HOPPER

SELECTOR SW

TAN

TIMER

P1 P4

GRINDER INTERFACE

CONNECTOR

GRY

PNK

BLU

GRN/YEL

OPTIONAL

MULTI-SET SW

BLU

PNK

BLK

GRN

BLK

WHI/RED

SOL

SNUBBER

WHI/BLK

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

WIRING DIAGRAMS

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

WIRING DIAGRAMS

BLK

WHI

RED

BUNN-O-MATIC CORPORATION

SCHEMATIC WIRING DIAGRAM

FPG

NL1

RED

WHI/BLK

BLK

WHI/BLU

WHI/BRN

WHI

RED

WHI/BLK

BLK

WHI/BLU

WHI/BRN

WHI

GRN

BLK

MED

RED

WHI/BRN

WHI/BLU

BLK

RED

WHI/BRN

WHI/BLU

MOTOR

BLK

WHI

RED

RED 4

GREEN

AMP

TIMER

SELECT SW.

BLK

120 VOLTS AC

2 WIRE

SINGLE PHASE

60 HZ

White Strip-Tac Plus

Black Ink

Finished Size: 4.5" x 5.0"

?0% Reduction

BLK

WHI

RED

BUNN-O-MATIC CORPORATION

SCHEMATIC WIRING DIAGRAM

FPGA

NL1

RED

WHI/BLK

BLK

WHI/BLU

WHI/BRN

WHI

GRN

BLK

MED

RED

WHI/BRN

WHI/BLU

BLK

RED

WHI/BRN

WHI/BLU

MOTOR

BLK

WHI

RED

RED 4

GREEN

AMP

TIMER

SELECT SW.

BLK

230 VOLTS AC

2 WIRE

SINGLE PHASE

50/60 HZ

NOT A PURCHASED SCHEMATIC

FOR REFERENCE ONLY

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM

FPG-2 DBC, FPGB-2 DBC N

LEFT GATE LIMIT THERMOSTAT

LIMIT THERMOSTAT

SOL

WHI/ORA

WHI/GRN

WHI/YEL

RED

WHI/BLK

J1-6

J6-10

J6-5

J6-1

CONTROL PC BOARD

COIL

RELAY

RIGHT GATE

SHIELD

SWITCH UNIT ASSY

WHI

RED

BLU

BLK

100 VOLTS AC

120 VOLTS AC

2 WIRE

SINGLE PHASE

60 HZ

Switch Unit Assembly Codes

A1 Grind

A2 Stop

B2 Hidden Button "Right"

C1 Large Batch Size "Left"

C2 Medium Batch Size "Left"

C3 Small Batch Size "Left"

C4 Large Batch Size "Right"

C5 Medium Batch Size "Right"

C6 Small Batch Size "Right"

–

RECT

AMP

GRN

White Strip-Tac Plus

Black Ink

Finished Size: 3.5" x "4.25

55≈% Reduction

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

WIRING DIAGRAMS

LEFT

GATE

LIMIT

THERMOSTAT

LIMIT

THERMOSTAT

SOL

WHI/ORA

WHI/GRN

WHI/YEL

RED

WHI

WHI/BLK

WHI

GRN GRN

WHI

J1-6

J1-1

J6-10

J6-5

J6-1

CONTROL PC BOARD

RELAY

RIGHT

GATE

SHIELD

SWITCH UNIT ASSY

WHI

RED

BLU

BLK

RED

Switch Unit Assembly Codes

A1 Grind

A2 Stop

B2 Hidden Button "Right"

C1 Large Batch Size "Left"

C2 Medium Batch Size "Left"

C3 Small Batch Size "Left"

C4 Large Batch Size "Right"

C5 Medium Batch Size "Right"

C6 Small Batch Size "Right"

–

RECT

AMP

GRN

SCHEMATIC WIRING DIAGRAM

FPG-2A DBC

EMI FILTER

230 VOLTS AC

2 WIRE

SINGLE PHASE

50 HZ

NOT A PURCHASED SCHEMATIC

FOR REFERENCE ONLY

SOL

COIL

41545 122209

RELEASED FOR PRODUCTION

DIR Num: 41545.0000 20, January 2015

Service, Repair, Grinders Service And Repair Manual Bunn Coffee Grinder LPG 2 41545.0000

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