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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RELEASED FOR PRODUCTION

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.
41545.0000E

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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, thermal 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, EXPRESS 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 option 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, BrewWISE, 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 configuration 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 Commerce 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.
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.
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

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G9 WD - Packaging & Shim Removal

WARNING
MUST BE COMPLETED BY AUTHORIZED SERVICE PERSONNEL.
DO NOT PLUG IN !
SEE INSTRUCTIONS BELOW BEFORE USING !

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 1

Figure 2

Figure 3

Figure 4

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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.
e
® Pad (c)
Pressing the copyright pad allows programming access.
a
Pads (d)
“Hidden” buttons used to navigate setup and programming menus.
Pads (e)
Press button to select small, medium or large batch size.

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.
P633

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.

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OPERATING CONTROLS (Continued)
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.

URN
ON
O
F
F

S
T
A
R
T

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.

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.

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 initiates a grind cycle.

P1028

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.

P1029

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OPERATING CONTROLS (Continued)

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.

PANTONE
430 CVC

PANTONE
432 CVC

PANTONE
354 CVC

PANTONE
Black C

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.
c

Model G9-2T DBC
Grind Pad (a)
d
Pressing initiates a timed grind cycle.
Stop Pad (b)
Pressing ends the operation of the grinder.
a
® PAD (c)
Pressing the ® pad allows programming access.

e
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.
8

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OPERATING CONTROLS (Continued)
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.

P2947

Batch Selector Switch
Select Small, Medium or Large batch by turning the round selector knob
on the left front of the grinder.

P2947

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 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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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 terminals 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

Probable Cause

Remedy

Grinder will not start.

1. No power or incorrect voltage

(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.

2. Off/On/Start switch

(A) Momentarily press the Off/On/
Start switch to the “START” position.
(B) Refer to Service - Off/On/Start
switch for testing procedures.

3. Circuit Breaker (Not applicable on Press the “Reset” button, located on
Model LPG with capacitor)
rear of the grinder. Listen carefully
for a “click”. This resets the motor
protection circuit and indicates that
an overload may have been encountered 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.

4. Timer

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TROUBLESHOOTING (cont.)
Problem

Probable Cause

Remedy

Grinder will not start. (Continued)

5. Motor

Each motor is equipped with a
temperature and current overload
protection feature which will immediately shut off the motor when
an overload has occurred. Check
the grinder for obstructions. Refer
to Service - Motor for testing procedures.

6. Relay

Refer to Service - Relay for testing
procedures.

7. Bag sensor or Cup Sensor

(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.

Grinder will not shut off.

(A) Place the switch in the “OFF”
upper position.

1. Off/On/Start switch

(B) Refer to Service - Off/On/Start
Switch for testing procedures.

2. Timer

Refer to Service - Timer for testing
procedures.

3. Relay
4. Bag Sensor or Cup Sensor

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.

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Problem

Probable Cause

Remedy

Grinder starts, but will not dispense
from hopper.

1. Hopper(s)

Begin each grind cycle by visually
inspecting the hopper(s) for ample
supplies of whole bean coffee.

2. Blockage of hopper(s)

Foreign materials must not block
the openings at the bottom of the
hopper(s).

3. Slide Gate Solenoids (Model LPG2E only)

Refer to Service - Solenoids for testing procedures.

4. Timer

Refer to Service - Timer for testing
procedures.

5. Off/On/Start switch

Refer to Service - Off/On/Start
switch for testing procedures.

6. Slide plates

(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.

Incorrect amount of coffee.

7. Solenoids

Refer to Service - Solenoids for testing procedures.

8. Solenoid Limit Thermostat

Refer to Service - Solenoids for testing procedures.

9. Shear Plate

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 damaged.

1. Timer adjustment

Refer to the Adjustment section
in the Installation and Operation
Manual.

2. Snubber

Refer to Service - Snubber for replacement procedures.

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TROUBLESHOOTING (cont.)
PROBLEM
Incorrect coffee grind dispensed.

PROBABLE CAUSE
1. Burr adjustment

REMEDY
Refer to the Adjustment section
in the Installation and Operation
Manual.

Excessive chaff

1. Dechaffer

Replace the dechaffer springs.
Replacement dechaffer springs are
provided in the literature package
accompnting the grinder.

Grinder only dispenses from one
hopper

1. Hopper selector switch (Model
LPG-2E only)

Refer to Service - Hopper selector
switch for testing procedures.

Timer will not display or displays
incorrectly.

1. Digital Timer

(A) Unplug the grinder. Wait a few
seconds and plug it in again.
(B) Refer to Service - Timer for testing procedures.

Incorrect weight of coffee dispensed

1. Grinder scale requires calibration.

Refer to GRINDER SCALE CALIBRATION procedure.

2. Funnel handle touched during
grinding.

Do not touch funnel or funnel handle 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 electrical equipment should be performed only by qualified
service personnel. The grinder should be unplugged
when servicing, except when electrical tests are required and the test procedure specifically states to
plug-in the grinder.

P1306

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.
P1307

P602

P1308

CAUTION

PERSONAL INJURY
HAZARD.
KEEP FINGERS AND
FOREIGN OBJECTS
OUT OF HOPPER
OR CHUTE OPENING.

P603

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SERVICE (Cont.)
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.

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 housing and secure with two #8-32 keps nuts.
6. Refer to Fig. 2 when reconnecting the wires.

P1704

FIG. 1 BAG SENSOR SWITCH
Location:
The bag sensor switch is located inside the lower
front of the grinder housing behind the coffee dispensing 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.

WHI/VIO from
Off/On/Start
Switch
WHI/ORA to
Terminal “A”
on Relay

FIG. 2 BAG SENSOR SWITCH TERMINALS

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P1705

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SERVICE (Cont.)

AC MOTOR AND GRIND CHAMBER

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 momentarily 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.
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 motor, 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 mounting bracket.
9. Remove motor out the rear of the grinder housing.
10. Remove the four .250”-20 cage nuts from the
motor mount.

P1704

FIG. 3 AC MOTOR AND GRIND CHAMBER

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.
3.

Disconnect the grinder from the power source and
place a coffee bag behind the dispense chute.
Remove the electrical access panel at the rear of
the motor.

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RELEASED FOR PRODUCTION
SERVICE (Cont.)
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.

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 bushing 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 assembly (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).

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)

FIG. 4 AC MOTOR TERMINALS

DIR Num: 41545.0000

P1310

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
AC MOTOR AND GRIND CHAMBER (cont.)

18 1
20 7 6

11 10 9 8

5
3

13
15

7
12
FIG. 5 GRIND CHAMBER COMPONENTS

P1708

9. Remove bushing (10) and shaft extension (11) from
grinder motor shaft. Inspect for wear. Replace if excessively 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 Operating Manual, and reset the burrs.

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 excessively 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 stationary 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.
18

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
DC MOTOR AND GRIND CHAMBER - G1MD ONLY
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 momentarily 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.
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.

P1706

FIG. 6 DC MOTOR AND GRIND CHAMBER
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 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.
3.

Disconnect the grinder from the power source and
place a coffee bag behind the dispense chute.
Remove the black wire from the rectifier (+) terminal and the red wire from the (-) terminal.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
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 (+)

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 motor 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 position 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.

FIG. 7 DC MOTOR TERMINALS

P1710

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 assembly.
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 excessively worn or damaged.
NOTE: Burrs are serviced in sets of two with hardware.
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).

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). Inspect adjusting screw w/bearing for wear. Replace
if excessively worn or damaged.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
14. Install the adjusting screw w/bearing (19) into the
grind selector dial plate (18).
15. Install grind selector dial plate (18) with adjusting 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.

DC MOTOR AND GRIND CHAMBER - G1MD ONLY
(cont.)
11. Install burr (7) on burr auger rotor/spring assembly (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).

11 10

22
4

21
20

1
16

7
13

FIG. 8 MOTOR AND GRIND CHAMBER REMOVAL

DIR Num: 41545.0000

P1711

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
MOTOR (Models LPG & FPG)

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.

FIG. 9 MOTOR

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. 10 MOTOR REMOVAL

P1049

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 components (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.
22

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
MOTOR (Models LPG & FPG)
8. Remove spacer plate (3) and set aside for reassembly.
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.

2
3

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 reassembly.
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.

5
6

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.

FIG. 11 SOLENOID AND GATES

P1050

1.
2.
3.
4.

Retaining Ring W/Hopper Gasket
Slide Plate, Solenoid Plunger and Spring
Spacer Plate
Mounting Ring, Solenoid and Solenoid Mounting
Plate
5. Setscrew, #8-32
6. Motor and Burr Housing

17. Slide spring retaining bushing (15) off the motor
shaft and set aside for reassembly.
18. Remove the two #10-32 binding head screws securing the upper burr (16) to the motor and housing
assembly (17).
19. Remove the upper burr (16) and set aside for reassembly.
NOTE: If burrs need to be replaced, they must be replaced in matched pairs.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
MOTOR (Models LPG & FPG)
13

MODEL LPG ONLY

10 11

13 14 15 16

FIG. 12 ROTOR/AUGER, BURRS AND MOTOR COVER

P1051

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.

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 housing 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 bottom.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
DECHAFFER (Models LPG & FPG)
2
1

3 2 1

FIG. 13 DECHAFFER

P1062

Location:
The dechaffer spring plates are located in the burr
housing cap.

OPTONAL EXTRA
FINE DECHAFFER
P1063

FIG. 14 DECHAFFER REMOVAL/REPLACEMENT
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 dechaffer 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.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)

MOTOR (Models G9, G9-2, MHG)
3.
4.
5.

6.
7.
8.
9.

FIG. 15 MOTOR

P1309

10.

Location:
The motor is located in the upper wrapper under the
hopper.

11.

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.

12.
13.

The entire wiring harness must be fed into the bottom
of the grinder housing through the hole in the motor
mounting plate.
Remove both 6-32 screws beneath the upper front
inspection panel.
Remove the six 10-32, hex head screws on top of the
motor mounting plate.
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.
Remove the four 5/16”-18 bolts and nuts to separate
the motor from the mounting plate.
Mount the new motor and tighten the four bolts and
nuts. They should be tightened approximately one full
turn past snug.
Slide the motor mounting plate into the rear of the
grinder housing.
Feed the wiring harness into the top of the housing
through the hole in the motor plate.
Reinstall the six 10-32 hex head screws through the
motor plate and the two 6-32 screws through the
housing.
Reattach the green wire to the 10-32 stud on the motor
mounting plate.
Refer to the Off/On/Start switch section when reconnecting the switch wires.
Refer to the illustration below when reconnecting the
motor wires.
WHI/ BLU to Snubber
WHI/BLU to Relay
WHI/BLK to Cordset
(120V models)
RED/BLK to Cordset
(230V models)

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.
3.
4.

WHI/BLK to Snubber
GRN to Chasis Ground
YEL to Snubber

Disconnect the grinder from the power supply.
Remove the electrical access panel at the rear of the
motor.
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.
Disconnect the grinder from the power supply.

FRANKLIN MOTOR

WHI/BLK to Snubber
YEL to Snubber
WHI/ BLU to Snubber
WHI/BLK to Cordset

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.
WHI/BLU to Relay
GRN to Chasis Ground

Removal and Replacement - MOTOR
1. Remove all wires from the Off/On/Start switch, motor,
and motor mounting plate.

MARATHON MOTOR
FIG. 16 MOTOR WIRING
26

DIR Num: 41545.0000

P621
41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
MOTOR (Models G9, G9-2, MHG)

2
1

1
2

0 15 14
13
12
11

3
4
5

1.
2.
3.
4.
5.

FIG. 17 MOTOR AND GRIND CHAMBER
6. Rotor
Indicator Adjustment Cap & Decal
7. Spring
Adjusting Screw
8. Burr (Rotating)
Burr Housing Cap
9. Burr (Stationary)
Rotor Cup
Shear Plate

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.

10
6 7 8

P1311

4. Inspect the grind chamber and remove any foreign 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.

NOTE: Burrs must be replaced as a set.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
SNUBBER (Models G9, G9-2, MHG)

BLY

E
FIN

EMPT UG

THORO

F T
O H
R IS
E
C
R OV
EA E
S S R.

SE
AR
CO

WHI/ BLU to Snubber
WHI/BLU to Relay
WHI/BLK to Cordset
(120V models)
RED/BLK to Cordset
(230V models)

E NG

COVRI BE

NOTI

EM E
H
HL OPPER BEFORE RAMB
YC
LEAN GRIND CH

WHI/BLK to Snubber
GRN to Chasis Ground
YEL to Snubber

P611

FIG. 18 SNUBBER
FRANKLIN MOTOR

Location:
The snubber is located at the back of the motor
attached to the right side of the wiring harness.

WHI/BLK to Snubber
YEL to Snubber
WHI/ BLU to Snubber
WHI/BLK to Cordset

Removal and Replacement:
1. Remove snubber wires from the motor terminals.
2. Cut the ties holding snubber to the wiring harness.
3. Refer to the following illustration when reconnecting the wires.
4. Fasten snubber to the wiring harness using new
ties.

MARATHON MOTOR

WHI/BLU to Relay
GRN to Chasis Ground
P621

FIG. 19 SNUBBER

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Grinder Scale (Model G9WD only)
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.
LEVEL 2 FUNCTIONS:

Press the hidden
(copyright) button for
3 seconds in “ENTER
PASSWORD” menu.

MACHINE TYPE
WEIGHT
TIMED

CALIBRATE SCALE ?
NO
YES

CALIBRATION OZ
(-)
8.00
(+)
MODIFY MAXBIT
NO SPREAD? YES

CALIBRATE SCALES
EXIT TARE
SHUToff Bits ##
(-)
DONE (+)
PLEASE WAIT
TARE
MaxBits read #
(-)
DONE (+)
PLACE 8.00 oz
EXIT DONE
Finished, returns
to main screen

PLEASE WAIT
CAL

DIR Num: 41545.0000

41545 072710

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Capacitor (Model LPG only)

F/ST
OF

into

1.
2.
3.

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.

rails

n.
el
sitio
funn
po
ide
RT"
d sl
TA
an
d.
"S
el
to
ishe
funn
itch
n fin
to
sw
r in
whe
the
filte
op
sh
ce
ly st
y pu
Pla
ical
taril
mat
en
to
Mom
ill au
rw
de
Grin

T
AR

FIG. 20 CAPACITOR

P1745

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 motor does not run, disconnect the capacitor wiring
harness from the main wiring harness. If the motor
now runs, replace the capacitor.

BLK

WHI/BRN

P1747

FIG. 21 CAPACITOR TERMINALS

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Circuit Breaker (Models LPG, LPG-2E, FPG, FPG-2 DBC)
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.

RED from Motor-LPG-2E
BLK from Start Switch-LPG

FIG. 22 CIRCUIT BREAKER

P1036

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.

BLK from Power Cord

FIG. 23 CIRCUIT BREAKER TERMINALS

P1037

Test Procedure:
1. Disconnect grinder from the power source.
2. Remove the wires from the circuit breaker.
3. Check for continuity between the terminals. Continuity 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.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Hopper Selector Switch (Model LPG-2E only)

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.

FIG. 24 HOPPER SELECTOR 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.

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.

WHI to OFF/ON/START Switch
BLU to Timer P1-4 (BLU)

If continuity is present as described proceed to #6.
If continuity is not present as described, replace the
switch.

P1038

FIG. 25 HOPPER SELECTOR SWITCH TERMINALS
(Viewed from rear)

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Hopper Selector Switch (Model G9-2 only)
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.

P594

FIG. 26 HOPPER SELECTOR SWITCH
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 terminals.

ORA to Timer P1-6
BLU to Timer P1-8
YEL to Timer P1-1
P787

FIG. 27 HOPPER SELECTOR SWITCH TERMINALS

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.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Off/On/Start Switch (Models LPG, LPG-2E, FPG, G-1,G-2,G-3, G9, G9-2, G2 trifecta)
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.
FIG 28 OFF/ON/START SWITCH

P594

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 reconnecting the wires.

Location:
The Off/On/Start switch is located to the left side on
the front of the housing above the upper front inspection 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).

VIO to timer P1-2
BLK to Cordset
BLK to timer P4-1

CORDSET CONNECTOR
Looking Strait-on
Black

WHI/RED timer to P4-6
BLU to SW2
PNK to Intf conn. 2

White

Ground

Grinders with Digital Timer

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 harness.

VIO to timer P1-2
BLK to Cordset

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.

WHI/RED timer to P4-6
BLK to timer P4-1
BLU to SW2
PNK to Intf conn. 2

Grinders with Analog Timer

If continuity is present as described, proceed to #6.
If continuity is not present as described, replace the
switch.

P606

FIG 29 OFF/ON/START SWITCH TERMINALS
34

DIR Num: 41545.0000

41545 072710

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Urn/Carafe Switch (Models G9, G9-2)
4. Place the switch in the “URN” position; check for
continuity across the orange and green wire terminals.
If continuity is present as described, the switch is
operating properly.
If continuity is not present as described, replace
the switch.

URN
ON
O
F
F

S
T
A
R
T

CARAFE

FIG 30 URN/CARAFE SWITCH

P1300

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.

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.

TAN

YEL

PNK

ORA

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.

GRN

P1318
P1318

FIG 31 URN/CARAFE SWITCH TERMINALS

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Batch Selector Switch (Model FPG)
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.

P2947

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 selection 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.

ORN to TIMER

TAN to POTENTIOMETER
GRY to POTENTIOMETER
PNK to POTENTIOMETER

P787

FIG 33 BATCH SELECTOR SWITCH TERMINALS

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Potentiometer (Model FPG)
SMALL

MEDIUM

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.

LARGE

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.

P2946

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.

DIR Num: 41545.0000

BRN to BRN WIRE
at TIMER

PNK to BATCH SELECTOR SWITCH
GRY to BATCH SELECTOR SWITCH
TAN to BATCH SELECTOR SWITCH

FIG 35 POTENTIOMETER TERMINALS

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Rectifier (Models G1 MD, FPG-2 DBC)
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 mounting 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. 36 RECTIFIER

P1706

FIG. 37 RECTIFIER TERMINALS

P1381

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 (-) terminals 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 operating properly.
If voltage is not present as described, refer to the
grinder wiring diagram and check the grinder wiring
harness.
38

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Relay (Early Model G-9)
4.
5.

ES
UT ATIC C
MIN-O-M 0 VA
NN 12
BU 2026

P/N

6.
Single set timer shown
Multi set timer (Urn/Carafe) similar

Remove the white/red and white/blue wires from
the relay contacts.
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.
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.

P1312

FIG 38 RELAY
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.

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.

ES
UT ATIC C
MIN-O-M 0 VA
NN 12
BU 2026

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.
P/N

WHI/BLU to Motor L1
WHI/GRN to Timer L4

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 harness.

WHI/RED to Timer TL1

FIG 39 RELAY TERMINALS

DIR Num: 41545.0000

P610

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)

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

6.
7.

FIG.40 RELAY

P1704

Location:
The relay is located on the grinder base inside the
lower housing.

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.

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.

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. Continuitymust 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. Connect 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 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.

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) 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 models.
c. 240 volts ac for two wire 240 volt 60 Hz models.
Disconnect the grinder from the power source.
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 models.
c. 240 volts ac for two wire 240 volt 60 Hz models.
Disconnect the grinder from the power source.

Remove the white/red wires from relay contacts
7 & 9.

If continuity is present as described, reconnect the
wires, the relay is operating properly.
If continuity is not present as described, replace the
relay.
40

DIR Num: 41545.0000

41545 072710

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
RELAY (cont.)
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.

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 to Main
Harness 120V (B)
RED/BLK to Main
Harness 240V (B)

WHI/VIO from
Switch to Relay
K-6

WHI to Main
Harness 120V(0)
RED/BLK to Main
Harness 240V(0)

WHI/BLU from
Motor to Relay
K-4

WHI/RED from
Switch to Relay
K-2 & K-8

WHI/ORN from Bag Sensor
WHI/RED from
Switch (A)
Switch to Relay
K-7 & K-9
120V AND 240 VOLT AC MODELS
WHI/VIO from
Switch to Relay
K-6
WHI/BLU from
Motor to Relay
K-4
WHI/RED from
Switch to Relay
K-7 & K-9
WHI/VIO from
Switch to Relay
K-6

WHI/ORN from Bag
Sensor Switch(1)

WHI/VIO from
Switch to Relay K-6
WHI/BLU from
Motor to Relay K-4

120V AND 240 VOLT AC MODELS

WHI to Main
Harness 120V (B)
RED/BLK to Main
Harness 240V (B)

WHI/ORN from Bag
Sensor Switch(1)

WHI to Main
Harness (0)

WHI/RED from
Switch to Relay
K-2 & K-8

WHI/ORN from Bag Sensor
Switch (A)

WHI/VIO from
Switch to Relay K-6
WHI/BLU from
Motor to Relay K-4
120 VOLT DC MODELS

120 VOLT DC MODELS
RED from Main
Harness (B)

RED from Main
Harness (0)

WHI/BLU from
Motor to Relay
K-4

WHI/ORN from Bag
Sensor Switch(1)

WHI/RED from
Switch to Relay
K-2 & K-8

WHI/RED from
Switch to Relay
K-7 & K-9

WHI/ORN from Bag Sensor
Switch (A)
230 VOLT AC 50 Hz MODELS

WHI/VIO from
Switch to Relay K-6
WHI/BLU from
Motor to Relay K-4

230 VOLT AC 50 Hz MODELS

P1707

EARLY MODELS

P3696

FIG. 41 RELAY TERMINALS

LATE MODELS

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Relay (Models MHG, FPG-2 DBC, Late Model G-9, G9-2, G9-2 DBC)
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.

FIG 42 RELAY
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.
FIG 43 RELAY TERMINALS

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.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Hopper Slide Plates (Models G9-2, G9-2 DBC)
M.
A.

A.
B.
C.
D.
E.
F.
G.
H.
I.
J.
K.
L.
M.

B.
C.
J.

G.
H.

Solenoid Coil
Fiber Washer
Spring
Spring Retaining Washer
Solenoid Plunger
Snap Ring
Short Link
Long Link
Slide Plate
Pivot Pin
Stop Block
Solenoid Mounting Plate
Solenoid Limit Thermostat

P608

FIG 44 HOPPER SLIDE PLATES
Location:
The slide plates are located on the solenoid mounting plate immediately beneath the hopper openings.
The slide plates must always remain flat for proper
operation.

Removal and Replacement:
1. Remove the hopper from the grinder.
2. Remove six slotted head screws holding the solenoid 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.

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.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Hopper Slide Plates (Models MHG)

A.
B.
C.
D.
E.
F.

Solenoid Coil
Slide Gate
Slide Gate Support
Collector
Collector Seal
Solenoid Mounting Plate

F.
B.
D.

D.
E.

FIG 45 HOPPER SLIDE PLATES
Location:
The slide plates are located on the solenoid mounting 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.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Solenoids (Models MHG, FPG-2 DBC, LPG-2, G9-2, G9-2 DBC)
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.

P608

FIG 46 SOLENOIDS
Location:
The solenoids are located on the mounting plate
immediately beneath the hoppers.

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 reconnecting the wires.

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 thermostat.
5. Check for continuity across the white/brown wires
on the suspect solenoid coil.

WHI/YEL to
Timer P4-5

RED/BLK to
Right Solenoid
RED/BLK to
Timer P4-7

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.

WHI/ORN to
Timer P4-4

Right
Left

FIG 47 SOLENOID TERMINALS
45

DIR Num: 41545.0000

RED/BLK to
Left Solenoid

P612
41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Timer (Model LPG-2E)
If voltage is present as described, proceed to step
#7.
If voltage is not present as described, replace the
timer.

FIG. 48 TIMER

7. Place the hopper selector switch in the right position.
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.

P1061

Location:
The timer is located inside the hopper housing just
behind the left solenoid.

If voltage is present as described, proceed to
step#10.
If voltage is not present as described, replace the
timer.

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.

10. Insert the positive (+) lead of a volt meter set to read
at least 120 volts DC, along side the black wire (terminal 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, proceed to step
#4.
If voltage is not present as described, refer to the wiring
diagram and check the grinder wiring harness.

If voltage is present as described the timer is operating
properly.
If Voltage is not present as described, replace the
timer.

4. Place the hopper selector switch in the left position.
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.

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.
46

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Timer (Model LPG-2E)
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.

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.

Timer (Models LPG, FPG)

FIG. 49 TIMER

If voltage is present as described the timer is operating
properly.
If Voltage is not present as described, replace the
timer.

P1748

Location:
The timer is located inside the rear access panel.
Adjustments can be made by removing the 2” hole
plug.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Timer (Model G9)
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.

Disconnect the grinder from the power supply.

S
UTEATIC C
MIN-O-M 0 VA
NN 12
BU 2026

P/N

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.

Single set timer shown
Multi set timer (Urn/Carafe) similar

FIG 50 TIMER

P1312

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).

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.

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. 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.
3. Disconnect the grinder from the power supply.

WHI/RED to Relay N.O.
WHI/RED to
Off/On/Start Switch

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.

WHI to Cordset (120 v)
RED/BLK to Cordset (240 v)

WHI/ORA to
Off/On/Start Switch

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.

M
B IN
P/NUNN UTE
5
26 -O-M S
20
- ATIC
12
0V
AC

WHI/GRN to Relay Coil
WHI/YEL to
Off/On/Start Switch

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 Wiring Diagram and check the grinder wiring harness.

Single set timer shown
Multi set timer (Urn/Carafe) connections are the same
P1313

FIG 51 TIMER TERMINALS
48

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Timer (Model G9-2)

DIS

E (Se
E TIM

s)
nd
co

DIS

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 operating properly.
If voltage is not present as described, replace the
timer.

cre

e
as

s.
ute
5 min
for ted
yed jus .
pla ad yed
dis ly be pla
l be on is dis
t wil can ut
ou er do
E
ad
Re Timile rea
LTAG
wh

Inc

rea

N IN

WAOUS
RD
ZA
HA

ER
IND G
GR VIN
UG MO
PL RE
UN RE
FO
BE

Digital Timer

TIME
SE S)
EN ND
SP
DI (SECO
10
2

1
.4

3.2

3
25

3.2

30
4

OFF

HT
RIG

LOW

3
25

LOW

OFF

H
HIG

HIG

2
15

T
LEF

G E
LTAG
N IN
VO

W OUS
RD
ZA
HA

LOW

ER
G

IND
GR VIN
UG MO
PL RE
UN RE
FO
BE

Analog Timer

P613

FIG 52 TIMER
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 position 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.

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 volume dispensed.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Control Board (Model MHG)
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 terminals.
4. Remove the bracket and control board by removing 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.

FIG 53 CONTROL BOARD
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.

J16

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.

J12

J13
J7

J5
MOV4
TH3
MOV3
TH2
MOV2
TH1
MOV1

FIG 54 CONTROL BOARD TERMINALS

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Control Board (Models FPG-2 & G9-2 DBC)
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
J1

TH1

J3
J4

TH2

TH3

J5
J8

J9
J6

J10 J7

FIG 56 CONTROL BOARD TERMINALS

FIG 55 CONTROL BOARD
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.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Membrane Switches (Model MHG only)
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 surface.
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.

FIG 57 MEMBRANE SWITCH
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.
TEST SWITCHES?
NO
YES

PRESS RIGHT
HIDDEN TO EXIT

NOTHING PRESSED

PRESSING ANY BUTTON
EXCEPT THE RIGHT HIDDEN
BUTTON WILL DISPLAY
THE BUTTON NAME
ON THE SCREEN

TEST FREQUENCY?
NO
YES

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Membrane Switches (Models FPG-2 & G9-2 DBC)
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 surface.
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.

ION

UT RY
CA INJU
AL .
SON ARD AND
PER HAZ ERS S

ECT
P FINGOBJPER .
KEE EIGNHOP NING
FOR OF OPE
OUT TE
CHU

FIG 58 MEMBRANE SWITCH
Location:
The membrane switch is located on the front of the
hopper housing.

To Control Board J6
SHIELD

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.
A1 - #5
A2 - #6
B2 - #10
C1 - #2
C2 - #3
C3 - #4
C4 - #9
C5 - #8
C6 - #7
- #1

SWITCH UNIT ASSY

FIG 59 MEMBRANE SWITCH

Grind
Stop
Hidden Button "Right"
Large Batch Size "Left"
Medium Batch Size "Left"
Small Batch Size "Left"
Large Batch Size "Left"
Medium Batch Size "Left"
Small Batch Size "Left"
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.
53

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
EMI Filter (Models FPG & FPG-2)
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.

FIG 60 EMI FILTER
118.0 kΩ - 118.5 kΩ
Across either pair

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)

FIG 61 EMI FILTER TERMINALS

If resistance is present as described the EMI Filter is
operating properly.
If resistance is not present as described, replace the
EMI Filter.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Funnel Sensing Coil (Models MHG & G9-2 DBC)
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.

FIG 62 FUNNEL SENSING COIL
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.

FIG 63 FUNNEL SENSING COIL TERMINALS

If this amount of resistance is not present, replace the
funnel sensing coil.

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Memory Clock Board (Model MHG)
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 component 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 64 MEMORY CLOCK BOARD
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.

J1-1

MEMORY
BOARD

+5VDC

J1-5

GRN
WHI
RED
BLK

J16-1

J16-5

FIG. 65 MEMORY CLOCK BOARD CONNECTORS

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
SERVICE (Cont.)
Display Board (Model MHG)
Removal and Replacement
1. Disconnect the grinder from the power supply.
2. Remove the two 6-32 screws attaching the membrane 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.
To Control Board J8

J10-1

Location:
The display board is located inside the hopper
housing behind the membrane switch.

J10-4

BLU
GRN
YEL
ORN

FIG 66 DISPLAY BOARD

J9-15

J9-10

J9-1

J9-5

DISPLAY BOARD

J9-1

FIG 67 DISPLAY BOARD TERMINALS

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
TRIAC MAP for MHG

MOV1
TH1 & MOV2
TH2 & MOV3
TH3 & MOV4

controls
controls
controls
controls

Transformer
Left Gate
Relay
Right Gate

@ J5-4,5,6
@ J5-3
@ J5-2
@ J5-1

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
TRIAC MAP for FPG-2 DBC and G9-2 DBC

TH1 & MOV1
TH2 & MOV2
TH3 & MOV3
MOV4

controls
controls
controls
controls

Left Gate
Relay
Right Gate
Transformer

@ J1-1
@ J1-2
@ J1-3
@ J1-4,5,6

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM
G9-2 DBC, G9-2T DBC W/SMART FUNNEL®

B
L
K

SOL

COIL

RIGHT GATE

LIMIT THERMOSTAT
SOL

WHI/ORA

W
H
I

J1-6

WHI/GRN
WHI/YEL
BLK
CONTROL PC BOARD

WHI
RED/BLK

J6-10

J8-1

J8-3

J1-6

J6-1

RELAY

LIMIT THERMOSTAT

J6-5

LEFT GATE

FUNNEL SENSOR
WHI/GRN
WHI/VIO
SHIELD
1

SWITCH UNIT ASSY
Models with RUN capacitor
START
RUN
CAPACITOR
CAPACITOR
RED
RED

120 OR 220-240
VOLTS AC 2 WIRE
SINGLE PHASE
50/60 HZ

Grind
Stop
Hidden Button "Right"
Large Batch Size "Left"
Medium Batch Size "Left"
Small Batch Size "Left"
Large Batch Size "Right"
Medium Batch Size "Right"
Small Batch Size "Right"

Switch Unit Assembly Codes
A1
A2
B2
C1
C2
C3
C4
C5
C6

BLK

WHI/BLU

RELAY
CONTACTS
33734.0000H 10/14 © 2001 Bunn-O-Matic Corporation

WHT

GRY
M

GRINDER MOTOR

DIR Num: 41545.0000

WHI

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM
G9-2 DBC, G9-2T DBC W/SMART FUNNEL™

B
L
K

SOL

COIL

RIGHT GATE

LIMIT THERMOSTAT
SOL

WHI/ORA

W
H
I

J1-6

WHI/GRN
WHI/YEL
BLK
CONTROL PC BOARD

WHI
RED/BLK
J8-3

J8-1

J6-10

J1-6

J6-1

RELAY

LIMIT THERMOSTAT

J6-5

LEFT GATE

FUNNEL SENSOR
WHI/GRN
WHI/VIO
SHIELD
1

On/Off
Grind
Stop
Hidden Button “Right”
Hot Coffee “Full”
Hot Coffee “Half”
Iced Coffee

Switch Unit Assembly Codes
A1
A2
A3
B2
C2
C3
C5

SWITCH UNIT ASSY
GRINDER MOTOR

120 OR 230 VOLTS AC
2 WIRE
SINGLE PHASE
50/60 HZ

BLK

WHI/BLU

WHI

RELAY
CONTACTS
33734.0003A 02/05 © 2005 Bunn-O-Matic Corporation

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM
G9-2TB DBC W/SMART FUNNEL®
LEFT GATE
RELAY

LIMIT THERMOSTAT
SOL

COIL

LIMIT THERMOSTAT

RIGHT GATE

SOL

WHI/ORA

W
H
I

J1-6

WHI/GRN
WHI/YEL
BLK
CONTROL PC BOARD

WHI
RED/BLK
J8-3

J8-1

J6-10

J1-6

J6-1

B
L
K

J6-5

FUNNEL SENSOR
WHI/GRN
WHI/VIO

SHIELD
1

SWITCH UNIT ASSY
Models with RUN capacitor
START
CAPACITOR

RED

RUN
CAPACITOR

RED

100 VOLTS AC
2 WIRE
SINGLE PHASE
50 HZ

Grind
Stop
On/Off
Large Batch Size "Left"
Medium Batch Size "Left"
Small Batch Size "Left"
Large Batch Size "Right"
Medium Batch Size "Right"
Small Batch Size "Right"

Switch Unit Assembly Codes
A1
A2
A3
C1
C2
C3
C4
C5
C6

WHI/BLU

BLK

RELAY
CONTACTS

WHT

GRY
M

WHI

GRINDER MOTOR

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS
L1

SCHEMATIC WIRING DIAGRAM MHG
GRN

B
L
K

GRN

LIMIT
THERMOSTAT

WHI

WHI P1

P1, P2, P3 & P4 ARE
PINS OF A POLARIZED
FOUR-PIN CONNECTOR

GRN

W
H
I

SOL

LIMIT
THERMOSTAT
SOL

RIGHT GATE
WHI/YEL
P2

WHI/YEL

LEFT GATE
WHI/ORN

WHI/ORN
P3

CONTROL PC BOARD

BLK

RELAY
WHI

J5-1

WHI/GRN

WHI

COIL

RIGHT HOPPER SENSOR

YEL

J5-5

J12-1

YEL
ORN
LEFT HOPPER SENSOR

J16-5

J16-1

J8-1

VIO

J8-4

ORN
VIO

WHI
FUNNEL SENSOR

RELAY
CONTACTS

RED
BLK

J10-1

MEMORY
BOARD
J10-4

WHI/BLU

BLU
GRN
YEL
ORN

BLK

GRN
WHI

GRINDER MOTOR

Switch Unit Assembly Codes
Grind
Stop
Hidden Button "Left"
Hidden Button "Right"
Large Batch Size "Left"
Medium Batch Size "Left"
Small Batch Size "Left"
Large Batch Size "Right"
Medium Batch Size "Right"
Small Batch Size "Right"
"Digital" Left Hidden Button
"Brewer" Center Hidden Button
"Control" Right Hidden Button

J9-10

J9-5

J9-1
1

STATIC SHIELD

100 VOLTS AC,
120 VOLTS AC,
240 VOLTS AC
2 WIRE
SINGLE PHASE
50/60 HZ

DISPLAY BOARD

A1
A2
B1
B2
C1
C2
C3
C4
C5
C6
D1
D2
D3

SWITCH UNIT ASSY

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM
MHG with WD CBA

LI N

EMI
FILTER

WHT

BLK

CONTROL PC BOARD

LINE
LOAD

MOTOR RELAY
GRY

LEFT GATE RELAY
GRY

A1
A2
B1
B2
C1
C2
C3
C4
C5
C6
D1
D2
D3

ORG

RIGHT GATE RELAY
GRY

SWITCH UNIT ASSEMBLY CODES

J1
RED
RED
VIO
GRY
ORG
YEL

VIO

YEL

RIGHT HOPPER
COIL
LEFT HOPPER
COIL

YEL

J12
1

YEL
ORG
ORG
VIO

FUNNEL COIL

VIO

GRIND
STOP
HIDDEN BUTTON "LEFT"
HIDDEN BUTTON "RIGHT"
LARGE BATCH SIZE "LEFT"
MEDIUM BATCH SIZE "LEFT"
SMALL BATCH SIZE "LEFT"
LARGE BATCH SIZE "RIGHT"
MEDIUM BATCH SIZE "RIGHT"
SMALL BATCH SIZE "RIGHT"
"DIGITAL' LEFT HIDDEN BUTTON
"BREWER" CENTER HIDDEN BUTTON
"CONTROL" RIGHT HIDDEN BUTTON

J6
1

LIMIT
THERMOSTAT

RIGHT GATE

J19
P2

SOL

WHT

WHT/YEL

K3
WHT/YEL

BLK

GRN

LIMIT
THERMOSTAT
WHT

LEFT GATE

WHT

WHT/ORG

SOL

WHT/ORG

BLK

GRN

Models with RUN capacitor
START
CAPACITOR

RUN
CAPACITOR
RED

RED

GRINDER MOTOR

BLK

WHT/BLU

WHT

GRY

STATIC
SHIELD

BLK

SWITCH UNIT ASSY

100 VOLTS AC, 120 VOLTS AC,
240 VOLTS AC
2 WIRE + Gnd
SINGLE PHASE, 50/60HZ
45151.0001B 10/14 ©2012 BUNN-O-MATIC CORPORATION

White Strip-Tac Plus
Black Ink
Finished Size: 4.0" x 4.25"
50% Reduction

DIR Num: 41545.0000

41545 110714

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS
SCHEMATIC WIRING DIAGRAM
LPG-2E, LPGB-2E

GRN
BLK

SELECTOR
SWITCH

3
AMP

WHI

GRN

TIMER ASSY.
(Hopper Slide
Gate Timer
Dial Wiring)
Right - Brown
Left - Orange

1
2
3
4
5
6
7
8
9
10

OFF/ON/START
SWITCH

WHI
BLU
YEL
WHI/BLK
BLK
RED
VIO
ORA

BLK GRINDER
WHI
M
RED
RED
RED
RT
SOL
SLIDE GATES

RED
RED

RED

LT
SOL

RED

YEL
WHI

100 VOLTS AC
120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS
SCHEMATIC WIRING DIAGRAM
LPG & LPG2
L1
B
L
K

GREEN
3
AMP

TIMER

BLK
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
GRN
BLK
RED
WHI/BRN
WHI/BLU

DC
MOTOR

BLK
WHI
RED
RED

120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ

P1
1
2
3
4
5
6
P2
1
2
3
4
5
P3
1
2
3
4

N
W
H
I

RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI

BLK
RED
WHI/BRN
WHI/BLU

BLK
WHI
RED
RED

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM
LPG-A
L1

B
L
K

GRN/YEL
3
AMP

TIMER

BLK
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
GRN
BLK
RED
WHI/BRN
WHI/BLU

DC
MOTOR

BLK
WHI
RED
RED

230 VOLTS AC
2 WIRE
SINGLE PHASE
50/60 HZ

P1
1
2
3
4
5
6
P2
1
2
3
4
5
P3
1
2
3
4

R
E
D

RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI

BLK
RED
WHI/BRN
WHI/BLU

BLK
WHI
RED
RED

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS
SCHEMATIC WIRING DIAGRAM
LPG W/Capacitor
L1

GREEN
BLK

TIMER

BLK
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
GRN
BLK

BLK

WHI/BRN

BLK
RED
WHI/BRN
WHI/BLU

DC
MOTOR

W
H
I

BLK
WHI
RED
RED

P1
1
2
3
4
5
6

RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI

P4
2
1

BLK
WHI/BRN

P2
1
2
3
4
5
P3
1
2
3
4

BLK
RED
WHI/BRN
WHI/BLU

BLK
WHI
RED
RED

120 VOLTS AC 2 WIRE
SINGLE PHASE 60 HZ

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS
SCHEMATIC WIRING DIAGRAM
LPG-B
L1
B
L
K

GREEN
3
AMP

TIMER

BLK
RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
GRN
BLK
RED
WHI/BRN
WHI/BLU

DC
MOTOR

W
H
I

BLK
WHI
RED
RED

100 VOLTS AC
2 WIRE
SINGLE PHASE
50-60 HZ

P1
1
2
3
4
5
6
P2
1
2
3
4
5
P3
1
2
3
4

RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI

BLK
RED
WHI/BRN
WHI/BLU

BLK
WHI
RED
RED

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM G1, G2, G3 & G2 trifecta
L1

100 VOLT AC
120 VOLT AC
230 VOLT AC
240 VOLT AC
2 WIRE + GRD
SINGLE PHASE
50/60 HZ

230V GRN/YEL

GRN or GRN/YEL

SW1
BLK

K-2 or K-7

WHI/RED

WHI/BLU
K-4

WHI/VIO

WHI

RED/BLK

WHI

RED/BLK

K-6
K-8 or K-9

SW2
WHI/VIO

WHI/ORA
1 or A

0 or B

White Strip-Tac Plus
Black Ink
Finished Size: 6" x 3"
~100% Reduction

DIR Num: 41545.0000

41545 072710

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM G9
GREEN

L1
BLK

WHI/RED

W
WHI/YEL
H
I
/
O
R
WHI/ORA
A
OPTIONAL KEY SW

120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ

WHI

WHI/RED
WHI/RED
WHI/GRN

WHI/BLU
L1

K1 N.O.

WHI
L2

1 2 3 4 5
TIMER

SCHEMATIC WIRING DIAGRAM
G9-URN/CARAFE
GREEN

L1
BLK

WHI/RED

WHI
WHI/RED

WHI/YEL
WHI/ORA

WHI/RED
WHI/GRN

K1 N.O.

1 2 3 4 5
TIMER
ORA

120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ

WHI/BLU

WHI
L2

BRN

ORA
PIN

YEL

GRN

URN

CARAFE

MULTI-SET SW
(OPTIONAL)

TAN

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM G9A HD
OPTIONAL POWER
INDICATOR LIGHT
RED/BLK
WHI/RED

L1
BLK

GREEN

WHI/RED

RED/BLK
WHI/RED

WHI/YEL
WHI/ORA

230 VOLTS AC
2 WIRE + GND
SINGLE PHASE
50 HZ

WHI/RED

WHI/GRN

WHI/BLU
L1

K1 N.O.

RED/BLK
L2

1 2 3 4 5
TIMER

SCHEMATIC WIRING DIAGRAM G9WD-RH
Models with RUN capacitor

START
CAPACITOR

RUN
CAPACITOR

N/L2

GRN

WHT

RED

BLK

GRY
BLK

BLK

WHT

BLK
L1

K1 N.O.

BLK

WHT
L2

GRINDER MOTOR

WHT

BrewWISE Models only

VIO

LINE

FUNNEL
SENSOR

VIO

YEL

LOAD
YEL

WHT

BLK

1 2

BLK
GRN
WHT
RED

LOAD
TRANSDUCER

J12

VIO

RED
RED
VIO
VIO

RED

4 5

J7
1

CONTROL CIRCUIT BOARD

J13

A1
A2
B1
B2
C1
C2
C3
D1
D2
D3

GRIND
STOP
HIDDEN BUTTON "LEFT"
HIDDEN BUTTON "RIGHT"
LARGE BATCH SIZE "LEFT"
MEDIUM BATCH SIZE "LEFT"
SMALL BATCH SIZE "LEFT"
"DIGITAL' LEFT HIDDEN BUTTON
"BREWER" CENTER HIDDEN
"CONTROL" RIGHT HIDDEN

73
White Strip-Tac Plus

Black Ink
DIR Num: 41545.0000

Finished Size: 5.5" x 6.0"

41545 072710

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM G9
GREEN

L1
BLK

WHI/RED

W
WHI/YEL
H
I
/
O
R
WHI/ORA
A
OPTIONAL KEY SW

WHI

WHI/RED
WHI/RED
WHI/GRN

WHI/BLU
L1

K1 N.O.

WHI

1 2 3 4 5
ORA
TAN
GRY

TIMER

120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ

PNK

1 2 3 4
OPTIONAL BREWER
INTERFACE CONNECTOR

OPTIONAL
MULTI-SET SW

SCHEMATIC WIRING DIAGRAM G9
GREEN

L1
BLK

WHI/RED

WHI

WHI/RED

OPTIONAL KEY SW

WHI/RED

WHI/YEL
WHI/ORA

WHI/GRN

WHI/BLU

K1 N.O.

WHI
L2

1 2 3 4 5

WHI/ORA

TAN

120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ

TIMER

GRY
PNK

OPTIONAL BREWER
INTERFACE CONNECTOR
1 2 3 4

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATICWIRINGDIAGRAMG9-2A HD
L1
OFF/ON/START
SW
BLK
PNK
BLU
HOPPER
SELECTOR SW
BLU

RT
OPTIONAL
MULTI-SET SW
BLU

BLK

230 VOLTS AC
2 WIRE
SINGLE PHASE
50 HZ

YEL

VIO
GRN
GRY
TAN
ORA
BLU

GRN/YEL

TIMER
1

RED/BLK
WHI/GRN
WHI/ORA
WHI/YEL

WHI/BLK
WHI/BLK

BLK
WHI/RED

LT
SOL
2

SOL
1

GRINDER INTERFACE
CONNECTOR
4
GRY
3
PNK
2
TAN
1

WHI
WHI/BLU
YEL

SNUBBER
WHI/BLK

WHI/RED

WHI/BLU

K1 N.O.

RED/BLK
L2

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM
FPG

GREEN

B
L
K

BLK

3
AMP

SELECT SW.

TIMER
A

RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI
GRN
BLK
RED
WHI/BRN
WHI/BLU

LG
BLK
WHI
RED
RED

DC
MOTOR

MED
SM

120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ

P2
1
2
3
4
5
6
P2
1
2
3
4
5
P3
1
2
3
4

N
W
H
I

RED
WHI/BLK
BLK
WHI/BLU
WHI/BRN
WHI

BLK
RED
WHI/BRN
WHI/BLU

BLK
WHI
RED
RED

SCHEMATIC WIRING DIAGRAM
FPGA
GREEN

B
L
K

3
AMP

SELECT SW.
2

White Strip-Tac
BLKPlus
Black Ink
RED
Finished Size:
4.5" x 5.0"
WHI/BLK
BLK
?0% Reduction
TIMER
A

BLK
RED
WHI/BRN
WHI/BLU

BLK
WHI
RED
RED

DC
MOTOR

230 VOLTS AC
2 WIRE
SINGLE PHASE
50/60 HZ

P2
1
2
3
4
5
P3
1
2
3
4

BLK
RED
WHI/BRN
WHI/BLU

BLK
WHI
RED
RED

DIR Num: 41545.0000

R
E
D

WHI/BLU
WHI/BRN
WHI
GRN

LG
MED

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM
FPG-2 DBC, FPGB-2 DBC

GRN

W
H
I

B
L
K

SOL

COIL

LIMIT THERMOSTAT
SOL

RIGHT GATE

W
H
I
/
B
L
K

J1-6

WHI/GRN
WHI/YEL
RED
CONTROL PC BOARD

WHI/BLK

J6-10

J1-6

J6-1

RELAY

WHI/ORA

J6-5

3
AMP

LIMIT THERMOSTAT

LEFT GATE

SHIELD
1

100 VOLTS AC
120 VOLTS AC
2 WIRE
SINGLE PHASE
60 HZ

Grind
Stop
Hidden Button "Right"
Large Batch Size "Left"
Medium Batch Size "Left"
Small Batch Size "Left"
Large Batch Size "Right"
Medium Batch Size "Right"
Small Batch Size "Right"

Switch Unit Assembly Codes
A1
A2
B2
C1
C2
C3
C4
C5
C6

SWITCH UNIT ASSY
RED

BLU
BLK

WHI

AC +
RECT
– AC

White Strip-Tac Plus
Black Ink
Finished Size: 3.5" x "4.25
55≈% Reduction

DIR Num: 41545.0000

41545 122209

20, January 2015

RELEASED FOR PRODUCTION
WIRING DIAGRAMS

SCHEMATIC WIRING DIAGRAM
FPG-2A DBC

RED

GRN
WHI/ORA
WHI/YEL
WHI

RED

GRN

WHI
EMI FILTER

RED
3
AMP

WHI

BLU
BLK

WHI

AC +
RECT
– AC

RED
RED
RELAY

RIGHT
GATE

COIL

SOL

WHI

WHI
WHI/ORA

LEFT
GATE

WHI/YEL

LIMIT
THERMOSTAT
WHI
WHI/BLK

RED

J6-5

J1-6

J6-1

CONTROL PC BOARD

WHI

LIMIT
THERMOSTAT
WHI
WHI

J6-10

SOL

J1-1

WHI/GRN

Switch Unit Assembly Codes
Grind
Stop
Hidden Button "Right"
Large Batch Size "Left"
Medium Batch Size "Left"
Small Batch Size "Left"
Large Batch Size "Right"
Medium Batch Size "Right"
Small Batch Size "Right"

SHIELD

230 VOLTS AC
2 WIRE
SINGLE PHASE
50 HZ

A1
A2
B2
C1
C2
C3
C4
C5
C6

SWITCH UNIT ASSY

NOT A PURCHASED SCHEMATIC
FOR REFERENCE ONLY

DIR Num: 41545.0000

41545 122209

20, January 2015

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History When                    : 2014:11:07 13:17:22-06:00
Format                          : application/pdf
Title                           : service, repair, Grinders Service and Repair Manual
Description                     : Service and Repair Manual for the MHG, FPG, FPG-2, LPG-2, G1, G2, G3, G2 trifecta, G9, G9WD, G9-2 and G9-2T DBC Grinders.
Subject                         : MHG, FPG, FPG-2, LPG-2, G1, G2, G3, G2 trifecta, G9, G9WD, G9-2 and G9-2T DBC. Grinders, Service Manual, Repair Manual, Coffee Bean Grinders
Producer                        : CIDEON PdfEditor V 3.1.119.0
Trapped                         : False
Keywords                        : ; MHG; FPG; FPG-2; LPG-2; G1; G2; G3; G2 trifecta; G9; G9WD; G9-2 and G9-2T DBC. Grinders; Service Manual; Repair Manual; Coffee Bean Grinders
Page Count                      : 79
Creator                         : Adobe InDesign CC 2014 (Macintosh)

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

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