Sanyo EM C120 １ User Manual To The 2f2658e7 B806 4657 B241 8c6004f85999

User Manual: Sanyo EM-C120 to the manual

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FORM # EM-C120 (02/05)

SERVICE MANUAL SUPPLEMENT

for Model EM-C120

Microwave Oven

CAUTION

WARNING TO SERVICE

TECHNICIANS

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING

SERVICING TO AVOID POSSIBLE EXPOSURE TO

EXCESSIVE MICROWAVE ENERGY

(a) Do not operate or allow the oven to be operated with the door open.

(b) Make the following safety checks on all ovens to be serviced before activating the magnetron or other

microwave source, and make repairs as necessary:

(1)Interlock operation, (2) proper door closing, (3) seal and sealing surfaces (arcing, wear, and other

damage), (4) damage to or loosening of hinges and latches, (5) evidence of dropping or abuse.

compartments, check the magnetron, wave guide or transmission line, and cavity for proper alignment,

integrity, and connections.

(d) Any defective or misadjusted components in the interlock, monitor, door seal, and microwave generation

and transmission systems shall be repaired, replaced, or adjusted by procedures described in this manual

before the oven is released to the owner.

(e)(i) A microwave leakage check to verify compliance with the Federal performance standard should be

performed on each oven prior to release to the owner. (For U.S.A)

(e)(ii) A microwave leakage check to verify compliance with the Canadian Regulation, HEALTH AND WELFARE,

SOR/79-920 should be performed on each oven prior to release to the owner. (For CANADA)

SUPPLEMENT OF

SERVICE MANUAL Microwave Oven EM-C160US

REFERENCE NO.SM-640180

See the Service Manual of EM-C180US(SM-640179)

except the items described in this Service Manual.

PRODUCT CODE NO. 437-453-00

CAUTION

For microwave energy emission

On every service call. A check for micro-

wave energy emission must be made

according to the following manner.

Measurement of energy emission

Measurement must be made with the microwave oven

operating at its maximum output and containing a load

of 275±15 milliliters of tap water initially at 20°±5°

celsius (68±9°F) placed within the cavity at the center.

NOTE:The water container must be a 600 milliliter bea-

ker and made of an electrically none conduc-

tive material such as glass or plastic.

The cook tray must be in place when measuring

emission.

A properly operating door and seal assembly will nor-

mally register emission no greater than 4 mW/cm2 to

allow for measurement uncertainty with the cooking

shelf or tray in place.

All repairs must be performed in such a

manner that microwave energy emission

is minimal.

Follow the instructions supplied with the detector be-

ing used and perform an R.F. emission test around the

door front, and all edges and vent of the outer case.

The cabinet (wrapper) must be in place and the oven

fully assembled.

When performing an emission survey, with the meter

on FAST RESPONCE, the movemtnt of detector probe

shall not exceed one (1) inch per second.

In the area emitting the highest reading, switch the

meter to SLOW RESPONSE and take a reading for

minimum of three (3) seconds. We recommended the

pattern outline shown below when the door surface is

surveyed.

NOTE: Periodically check to be sure that the probe tip

is not worn or dirty.

The following U.S. standard applies to microwave ov-

ens:

21 CFR 1030.10, Performance Standard for Microwave

Ovens.

It requires that the power density of the microwave

radiation emitted by a microwave oven shall not ex-

ceed five (5) milliwatts per square centimeter at any

point 5 centimeters (about 2 inches) or more from the

external surface of the oven.

All microwave ovens exceeding the emission level of 4

mW/cm2 must be reported to Dept. of Service for mi-

crowave ovens and the manufacturer immediately .

The owner should be told not to use the microwave

oven until it has been repaired completely.

If a microwave oven is found to operate with the door

open, report to Dept. of Service, the manufacturer and

CDRH* immediately. Also tell the owner not to use the

oven.

*CDRH: Center for Device and Radiological Health.

The interlock monitor switch acts as the final safety

switch protecting the customer from microwave radia-

tion. If the interlock monitor switch operates properly

and the door interlocs switch fails, the fuse will blow.

If this happens, all interlock switches must be replaced.

The contacts of the interlock switches may be welded

together.

- 1 -

1. SPECIFICATIONS

Microwave output ................1,200W to 120W

Frequency ........................... 2,450MHz

Power supply ....................... 120V, 60Hz

Rated current ......................15 Amp.

Safety Device ......................

Thermal protector(Magnetron)

150°C(270°F) Open

(Thermostat) 80°C(144°F)Close

Thermistor (Magnetron) 200°C(360°F) Open

108°C(194°F)Close

Thermistor(Duct)................120°C(216°F) Open

Fuse (Cartridge Type) ................. 250V 10A

Micro switch, Relay

Interlock Switch

Interlock monitor Switch

Door sensing Switch and

Relay RL-3 and RL-4

Max. input time....................Electronic Digital, up to

Manual

10min./Memory 30min.

Overall Dimensions........422(W)x540(D)x335(H) mm

Oven cavity size ............330(W)x330(D)x230(H) mm

Effective Capacity of Oven Cavity.........19.1liters

Net weight ........................... 29Kg

NOTE: The power output specification, 1200W on this

model is measured with IEC measurement. The power

output is measured with two(2) liters water is equiva-

lent to 1200W in measurement with IEC, when mea-

sured with the following power output.

(1)1. Fill two beakers, one liter of tap water respec-

tively

2. Use an accurate thermometer and measure each

water temperature respectively.

(2) Place beakers side by side in center of the

ceramic tray.

(3) Close the door,set the “TIME” for two minutes.

Touch the “START” key and heat the water for

exactly two minutes.

(4)Take the beakers out, immediately stir the water

and measure the water temperatures respectively.

(5) Calculate the temperatures rise of water in each

beaker. Then calculate the average value of the two

temperature rises.(ƒ¢t)

(6) The teperature rise shall be in the following range;

Average Temp. Rise

Minimum 15.4°C

Maximum 18.8°C

Power output is affected by the line voltage under load.

(7) For correct Power output measurement, the line

voltage under load must be 120±2 Volts.

2. POWER OUTPUT MEASUREMENT

Power output Measurement ...................................... 1

Precautions and Repair Service Tips ....................... 1

Circuit Diagram ......................................................... 2

Test Procedures ............................................3

Disassembly Instructions............................... 3 •`4

Exploded View and Parts List......................... 5 •`12

Overall Circuit Diagram.................................13 •`16

- 3 -

4. TEST PROCEDURES AND TROUBLESHOOTING

CAUTION

-DISCONNECT THE POWER SUPPLY CORD FROM THE WALL

OUTLET WHENEVER REMOVING THE CABINET FROM THE UNIT.

PROCEED WITH TESTS ONLY AFTER DISCHARGING THE HIGH

VOLTAGE CAPACITORS AND REMOVING THE LEAD WIRES ON

THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORM-

ERS FOR LOWER AND UPPER MAGNETRONS.

(SEE FIGURE 3)

COMPONENT

HIGH-VOLTAGE

TRANSFORMER

1) Measure the resistance:

With an ohm-meter on R x1 scale.

a. Primary winding;

b. Filament winding;

c. Secondary winding;

2) Measure the resistance:

with an ohm-meter on highest scale.

a. Primary winding to ground;

b. Filament winding to ground;

CHECKOUT PROCEDURE RESULT

Normal reading:

Approximately 1.0 ohms

Less than 1 ohm.

Approximately 83 ohms

Normal reading:

Infinite ohms.

Note: Remove varnish of measured point.

PRIMARY

WINDINGS

Secondary

Windings

Filament

Windings

Figure 2

Figure 3

A. TEST PROCEDURES

F. CHANGING POWER SUPPLY CORD

(See exploded view on page 5)

(1) Unfasten 1 screw for ground and pull out the

2 wires of the power cord from the terminal plate.

(2) Remove 1 screw for the bottom bracket of the

cord bushing.

(3) Install the new power supply cord with the

reverse procedure of above (1) to (2).

WARNING:

For changing the power supply cord, never use

other than the following.

Key No. Order No. Parts Name

5 617 140 1561 Power cord Ass’y

6 617 140 1332 Cord bush

7 617 140 1349 Bottom bracket

5. DISASSEMBY INSTRUCTIONS

- 4 -

Maintenance:

The microwave ovens are designed, manufactured, and tested for years of dependable operation. However, the

oven may require service from time to time if the consumable components listed below are not replaced at the

appropriate time. For protection from unexpected service calls and undue inconvenience, we recommend that

the user has the listed parts replaced at the intervals below, (at customer cost).

This will avoid the trouble of repeated service calls after the expiration of the warranty period.

Consumable components:

When more than 1,250 hours of accumulative cooking time or more than 200,000 cycles of door opening/closing

is observed by key operations, the following consumable components will be replaced.

(Maintenance light in window display indicates when accumulative cooking time reaches 1,250 hours.)

Light

1. Magnetron Tube, Part No. 415 002 7702

2. Printed Circuit Board-Relay, Part No. 617 137 3844

3. Switch base Assembly, Part No. 617 205 1208

4. Door Latch, part No. 617 068 1087

When more than 2,000 hours of accumulative cooking time is observed, the following consumable compo-

nents should be replaced.

5. Blower motor, Part No. 617 140 1585

When slow rotating of blower motor is observed after removing dust from blower motor, blower motor must

be replaced.

6. Door hinge, Part No. 617 120 3028

When a worn door hinge is observed and proper door adjustments can not be made, the door hinge must

be replaced.

7. Door Assembly, Part No. 617 178 0734

When a worn door pin is observed and proper door adjustments can not be made, the door assembly must

be replaced.

- 5 -

6. EXPLODED VIEW AND PARTS LIST

Main body Parts-1

NOTE: All component have special characteristics for safety and must be replaced using parts listed in

this manual.

All service on M/W ovens should be performed by a qualified technician using approved testing

equipment. Customers should not attempt replace component marked with a symbol.

- 6 -

NOTE: All component have special characteristics for safety and must be replaced using parts listed

in this manual.

All service on M/W ovens should be performed by a qualified technician using approved testing

equipment. Customers should not attempt replace component marked with a symbol.

- 8 -

Main body Parts-2

NOTE: All component have special characteristics for safety and must be replaced using parts listed

in this manual.

All service on M/W ovens should be performed by a qualified technician using approved testing

equipment. Customers should not attempt replace component marked with a symbol.

- 9 -

NOTE: All component have special characteristics for safety and must be replaced using parts listed

in this manual.

All service on M/W ovens should be performed by a qualified technician using approved testing

equipment. Customers should not attempt replace component marked with a symbol.

- 16 -

Wiring of High voltage Circuit

Door sensing switch

Viewed from back

Brown(C Inside)

Orange(C)

Brown

White/

Wiring of Switches

Purple

Monitor switch

Blue(NC Inside)

Light

Blue

Interlock switch

Orange

White

Pink(NO Insde)

Red wire

Transformer

Red wire

Filament Winding

Lower

Magnetron

Upper

Capacitor

Lower

Upper

Pink/Light Blue

Black

Brown

Blue/Blue

(NO)

(NC)

Yellow

Black

FRONTFRONT

FRONT

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