Garland Microwave Oven EM C180 User Manual

SERVICE MANUAL SUPPLEMENT

for Model EM-C180

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)

FORM # EM-C180 (02/05)

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CAUTION

For microwave energy emission

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.

On every service call. A check for micro-

wave energy emission must be made

according to the following manner.

NOTE: Periodically check to be sure that the probe tip

is not worn or dirty.

Measurement of energy emission

Measurement must be made with the microwave oven

operating at its maximum output and containing a load

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

ens:

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

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

21 CFR 1030.10, Performance Standard for Microwave

Ovens.

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.

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.

The cook tray must be in place when measuring

emission.

All microwave ovens exceeding the emission level of 4

mW/cm²must 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.

A properly operating door and seal assembly will nor-

mally register emission no greater than 4 mW/cm²to

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.

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.

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 RESPONSE, the movement of the detector

probe shall not exceed one (1) inch per second.

*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 interlock 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.

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- TABLE OF CONTENTS -

Adjustment Procedures............................................. 1

Test Procedures and Troubleshooting...............4 •`10

Disassembly Instructions .............................. 11•`14

Exploded View and Parts List ........................ 15•`22

Overall Circuit Diagram.................................23 •`25

Specifications............................................................ 2

Power output Measurement ...................................... 2

Precautions and Repair Service Tips ....................... 2

Circuit Diagram ......................................................... 3

1. ADJUSTMENT PROCEDURES

(All service adjustments must be made for minimum

microwave energy leakage readings.) (For Canada)

TO AVOID POSSIBLE EXPOSURE TO MICROWAVE

ENERGY LEAKAGE, THE FOLLOWING ADJUST-

MENTS OF THE INTERLOCK SWITCHES SHOULD

BE MADE ONLY BY AUTHORIZED SERVICE PER-

SONNEL.

NOTE: If the interlock monitor circuit operates and at

the same time the fuse blows with the door

open, be sure to replace the relay circuit board

, Interlock switch and monitor switch.

The service center should have the designated

detector to measure the microwave energy

leakage after the repair or adjustment.

NOTE: Detector to be used at the service center is

NARDA 8100, 8200 or the equivalent.

INTERLOCK SWITCH, INTERLOCK MONITOR

SWITCH AND DOOR SENSING SWITCH ADJUST-

MENT

Lever stopper

Interlock monitor

switch

(Figure 1)

(1) Loosen 2 screws securing the lever stopper.

(2) Adjust the lever stopper position so that it is pushed

up and pulled backwards until there is zero gap

between the latch lever and the switch body on the

interlock switch. At the same time there is zero gap

between the latch lever and the switch body on the

door sensing switch when the door latch is securely

locked.

Latch Lever

(3) Tighten the lever stopper screws securely.

(4) Make sure the interlock monitor switch closes

after the interlock switch opens when the door is

opened very slowly, according to “CHECKOUT

PROCEDURE FOR SWITCHES” on page 6.

(5) Make sure the interlock monitor switch opens

before the interlock switch closes when the door is

closed very slowly, according to CHECKOUT PRO-

CEDURE FOR SWITCHES” on page 6.

Interlock

switch (Secondary

interlock switch)

Latch Lever

(6)(i) Make sure the microwave energy leakage should

be no greater than 4 mW/cm²to allow to measure-

ment uncertainty when measured with a detector.

(All service adjustments must be made for mini-

mum microwave energy leakage readings.) (For US)

(6)(ii) Make sure the microwave energy leakage is

below the limit of 1 mW/cm²(at 275cc water load),

5 mW/cm²(at no load) and 5 mW/cm²(at 275 cc

water load without cabinet) when measured with a

detector.

Door sensing

switch

(Primary interlock

switch)

Screws

Figure 1

- 3 -

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2.SPECIFICATIONS

A. SINCE NEARLY 4,000VOLTS EXISTS IN SOME

CIRCUITS OF THIS MICROWAVE OVEN, RE-

PAIRS SHOULD BE CARRIED OUT WITH

GREAT CARE.

B.TO AVOID POSSIBLE EXPOSURETO MICRO-

WAVE ENERGY LEAKAGE,THE FOLLOWING

PRECATIONS MUST BETAKEN BEFORE SER-

VICING.

Microwave output ................ 1,800W to 180W

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

Power supply .......................208V, 60Hz

Rated current ...................... 13 Amp.

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

Thermal protector(Magnetron) 150°C(270°F)Open

(Thermostat)

Thermistor (Magnetron)

80°C(144°F)Close

200°C(360°F) Open

108°C(194°F)Close

(1) Before the power is applied.

(a) Open and close door several times to make

sure the interlock switch, door sensing switch

and interlock monitor switch operate properly.

(Listen for the clicking sound from switches.)

Make sure the interlock monitor switch is

closed after the interlock switch and door sens-

ing are open when the door is opened.

(See pages 1 and 6)

(b) Make sure the perforated screen and the choke

dielectric of the door are correctly mounted.

(2) After the power is applied.

(a) Open and close the door to see if the interlock

mechanism operates properly.

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 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 ...........................32Kg

(b) Check microwave energy leakage with a leak-

age detector and confirm the energy leakage

is below 5mW/cm²

3. POWER OUTPUT MEASUREMENT

NOTE: The power output specification, 1800W on this

model is measured with IEC measurement. The power

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

lent to 1800W in measurement with IEC, when mea-

sured with the following power output.

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

tively

(3) Do not operate the unit until it is completely

repaired of any of the following conditions.

(a) Door is not closed firmly against the cavity

front.

(b) The hinge is broken.

aged.

(d) The door is bent or warped, or there is any

other visible damage to the oven that may

cause microwave energy leakage.

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 temperature rise of water in each

beaker. Then calculate the average value of the two

temperature rises.( ƒ¢t)

Note: Always keep the seal clean.

(e) Make sure that there are no defective parts in

the interlock mechanism.

(f) Make sure that there are no defective parts in

the microwave generating and transmission

assembly. (especially wave guide).

(4) The following items should be checked after

the unit is repaired.

(a) The interlock monitor switch is connected cor-

rectly and firmly.

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

Average Temp. Rise

(b) The magnetron gasket on the magnetron is

properly positioned.

Minimum

Maximum

23.1°C

28.3°C

leakage of microwave energy).

Power output is affected by the line voltage under load.

(7) For correct Power output measurement, the line

voltage under load must be 208±2Volts.

(d) The door can be properly closed and the safety

switches work properly.

(e) The oven must be stopped when the door is

opened or the time is up.

The oven must not be operated with any of the above

components removed or bypassed.

4.PRECATIONS AND REPAIR SERVICE TIPS

PRELIMINARY

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6.TEST PROCEDURES AND TROUBLESHOOTING

PRIMARY

CAUTION

WINDINGS

-DISCONNECT THE POWER SUPPLY CORD FROM THE WALL

OUTLETWHENEVER REMOVINGTHE CABINET FROMTHE 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.

Secondary

Windings

Filament

Windings

(SEE FIGURE 3)

A.TEST PROCEDURES

Figure 3

COMPONENT

CHECKOUT PROCEDURE

RESULT

1) Check for resistance: Across the filament ter- Normal reading:

minal of the magnetron with an ohm - meter

on Rx1 scale.

Less than 1 ohm.

MAGNETRON

Figure 4

2) Check for resistance: Between each filament Normal reading:

terminal of the magnetron and the chassis

ground with an ohm-meter on highest scale.

Infinite ohms.

Figure 5

1) Measure the resistance:

With an ohm-meter on R x1 scale.

a. Primary winding;

Normal reading:

HIGH-VOLTAGE

TRANSFORMER

Approximately 1.0 ohms

Less than 1 ohm.

b. Filament winding;

c. Secondary winding;

Approximately 60 ohms

Normal reading:

2) Measure the resistance:

with an ohm-meter on highest scale.

a. Primary winding to ground;

b. Filament winding to ground;

Infinite ohms.

Figure 6

Note: Remove varnish of measured point.

- 6 -

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COMPONENT

CHECKOUT PROCEDURE

Measure the resistance: Across two terminals with Normal reading:

an ohm-meter on highest scale. Momentarily indicates several ohms, and

RESULT

HIGH-VOLTAGE

CAPACITOR

Including internal

bleeder

gradually to 10 meg-ohms.

Abnormal reading:

Indicates continuity or 10 meg-ohms

from the beginning.

resistor

Figure 7

Measure the resistance: Across two terminals with Normal reading:

an ohm-meter on highest scale. Indicate about middle position in one

HIGH-VOLTAGE

DIODE

direction (forward) and infinite ohms in

the reverse direction, using ohm meter

with a 9V battery.

NOTE

- Some digital meter may show more

than 0 ohms or infinite ohms even in a

forward direction because the low mea-

suring voltage of the meter does not

allow the meter to pass through the high

voltage diode. Use an ohm meter with

a 9V battery.

Abnormal reading:

Indicates continuity or infinite ohms in

both directions.

Figure 8

- 7 -

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COMPONENT

CHECKOUT PROCEDURE

RESULT

When

When not

Measure the resistance between terminals of

FPC connector after removing it from

S101.(Figure 10)

Resistance touched touched

TOUCH KEY

BOARD

Value

Less than More than

1 K ohms 1 meg ohms

NOTE

- When reconnecting the FPC connector, make

sure the holes on the connector are properly

inserted in hook of the plastic fastener in S101.

MATRIX CIRCUIT FOR

When checking the POWER key ,

connect the ohm-meter as illustrated

below.

TOUCH KEY BOARD

FPC CONNECTOR

TERMINAL OF FPC CONNECTOR

FIGURE 10

CHECKOUT PROCEDURE FOR SWITCHES

Disconnect the lead wires from the switches and check for the continuity of the switches, connecting an ohm-meter

to its terminals.

SWITCHES

(SEE Figure 1 on page 1)

CHECKOUT PROCEDURES

DOOR OPEN

DOOR CLOSED

INTERLOCK SWITCH

Terminals "COM" and "NO"

DOOR SENSING SWITCH

INTERLOCK MONITOR

SWITCH

Terminals "COM" and "NC"

CAUTION: After checking the switches, make sure that the interlock monitor switch is properly connected according

to the CIRCUIT DIAGRAM on page 3.

- 8 -

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WARNING:

Primary

Winding

When removing the cabinet, you must disconnect

the power supply cord from the wall oulet for your

safety. Only the checkout procedure below needs

the power supply on.TAKE GREAT CARE to avoid

possible electrical shock.

Primary

Winding

For your safety, proceed with the test only

after removing the wire leads from the pri-

mary winding of the high voltage transformer

Lower

Upper

COMPONENT

CHECKOUT PROCEDURE

RESULT

Normal reading:

Check voltage at S104 and S105 after remov-

ing each connector (female) from power circuit

board.

POWER

P.C.B

Connection

Pin No.,

S105

Voltage(V)

DC 12

Pin No.3 (Ground) and 4,5, 1,2 at S105.

Pin No.1 and 2 at S104.

#3 to #4

#3 to #5

#3 to #1

#3 to #2

DC 16

DC 30

DC 35

CAUTION:

For your safety, proceed with the test only

after removing the wire leads from the pri-

mary winding of high voltage transformer.

Test procedures:

a) Make sure that the power supply cord is not

plugged in.

S104

#1 to #2

AC 2.4

b) Remove the connector S104 and S105 from

the power circuit board.

c) Plug the power supply cord : back in.

d) And then, measure each voltage.

Measure the voltage: Between test points TP-1,

TP-2 ,TP-3 and ground (See figure 16 on page

23)

CONTROL

P.C.B

Test point

TP,

Voltage(V)

Note

TP-1

TP-2

TP-3

TP-4

DC - 5

DC - 12

DC - 16

DC - 35

- Proceed with the check of the control P.C.B to

see if any one of the measured values is differ-

ent from the specified values.

- 9 -

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B.TROUBLESHOOTING

CONDITION

TROUBLE

CHECK

RESULT

Shorted

REMEDY

Replace

Power with normal

voltage is applied. Place

a cup of water inside

microwave oven

Step down

Transformer

* “TIME”,”1”,”0” ,”0”

and “START” keys

are touched

Fuse(10A) blows

off immediately

Replace

H.V Capacitor

Shorted

Connection of FPC

from Touch key

board

Incorrect

Reconnect

No display

cooking time

Power circuit board

(See page 7)

Voltage

incorrect

Replace

Touch key board

(See page 6)

Resistance

incorrect

Voltage

incorrect

Control circuit

board

(See page 7)

Door sensing

switch

(See page 7)

No continuty

Replace

Cooking ope-

ration will not

start

Interlock switch

(See page 7)

Control circuit

board

(See pages 7 & 23)

Voltage

incorrect

Oven does not

heat up

See “HINT” on page

* Note:Oven will not accept settings of 60 through to 99 seconds.

TIME must be entered as 1 minute and 39 seconds for 99 seconds.

- 10 -

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CONDITION

TROUBLE

CHECK

RESULT

REMEDY

Low microwave

output

Magnetron

See “HINT”

on page 10

Poor

oscillation

Gear motor

Rotation has

stopped.

Uneven heating

Rotation of top or

bottom antenna

Repair or

replace

C. ERROR INDICATION

The Display will show an error indication for self-diagonosis as follows.

“E” means that a service technician is required .

“U” means that user can correct the operation.

Display

E-21

Trouble

Other Symptom

Solution

Oven stops heating.

Buzzer continuously beeps.

Blower motor will stop

immediately.

Thermistor (on duct) sensies

a temperature of 120°C or

higher.

Check and remove the cause of the cav-

ity fire or abnormal overheating.

This error function will be cancelled when

the power cord is unplugged.

Oven stops heating.

Buzzer does not beep.

Blower motor will stop

immediately.

Check for short-circuit of thermistor

itself or wire insulation of thermistor.

This error function be cancelled when the

power cord is unpluged.

Thermistor (on Magnetron) or

thermistor (on Duct) is

shorted.

E-31

E-32

Oven stops heating.

Buzzer does not beep.

Blower motor is operated.

Thermistor (on Magnetron) or

thermistor (on Duct) is opened.

Check for open-circuit of thermistor

itself or improper connection of wire

socket of thermistor.

This error function be cancelled when the

CLEAR key is touched.

Thermistor (on Magnetron)

senses a temperature of 200°C Buzzer continuously

or higher.

Oven stops heating.

Check and remove cause of abnormal

overheating (such as operation with

no food).

This error function will be cancelled when

the CLEAR key is touched.

U-10

U-50

beeps.

Blower motor will stop

immediately.

(Remark:

The key for “Start” is not

touched within 1 minute after

the door is opened or closed .

This error function will be cancelled

when the door is opened and closed.

The purpose of this func-

tion is to avoid accidental

operation while the user is

not attempting to operate

the oven.)

- 9 -

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THERMISTOR CHART

Duct

8000

7000

6000

5000

4000

3000

2000

1000

Magnetron

Thermistor connector

Temperature Ž

“HINT”

PROCEDURE FOR DETERMING WHETHER THE UPPER MAGNETRON CIRCUIT OR LOWER MAGNETRON

CIRCUIT IS DEFECTIVE.

SYMPTOM:One magnetron does not work giving less than normal heat.

Caution:

Make sure that cabinet (outer wrap) and rear plate are not removed from the oven for your safety.

1.Operate oven as follows.

1)Place a cup of water in the oven

2)Close the door.

3)Touch “CLEAR”, “TIME”, “5”, “0” and “START” keys to operate the oven for 50 seconds with full power level.

2. Determine if the Exhaust air is warm in the following positions..

1)Put your hand near the exhaust duct outside of the rear plate to feel the exhaust (Never remove

the cabinet and rear plate from the oven for your safety when you put your hand near exhausting duct.)

2)If air from the upper position of the duct is not warm,the upper magnetron circuit is defective.

If air from the lower position of the duct is not warm,the lower magnetron circuit is defective.

Cabinet(outer wrap)

Rear Plate

Upper position

Rear Plate

Lower position

Exhaust Duct

Figure 11

The H.V Transformer for

operating the upper Magnetron

is located on the inside of the

rear plate

The H.V Transformer for

operating the lower Magnetron

is located on the inside of the

rear plate

- 12 -

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7. DISASSEMBLY INSTRUCTIONS

- THE OVEN MUST BE DISCONNECTED FROM THE

ELECTRICAL OUTLET WHEN MAKING REPLACE-

MENTS, REPAIRS, ADJUSTMENT OR CONTINUITY

CHECKS. BEFORE PROCEEDING WITH ANY RE-

PAIR, WORK , WAIT AT LEAST 1 MINUTE, UNTIL

THE CAPACITOR INTHE HIGHVOLTAGE AREA HAS

FULLY DISCHARGED.

- If the interlock switch, the relay RL-3 and RL-4 or the

interlock monitor switch operate properly, determine

which of the following is defective : control circuit board,

high voltage transformer, high voltage capacitor, high

voltage diode or magnetron.

D. REMOVING DISPLAY CIRCUIT BOARD

(1) Disconnect all lead wires on the Control panel

from the Control PCB and Power PCB.

(2) Remove 4 screws securing the Control panel

Ass’y to the oven cavity.

A. REMOVING INTERLOCK SWITCH

(See Figure 1 on page 1)

(1) Disconnect all lead wires from the interlock

switches.

(2) Remove 2 screws securing the lever stopper.

(3) Remove 1 screw securing the switches.

Then pull out the switches.

(4) Make the necessary adjustment, and perform a

microwave energy leakage check according to

“1. ADJUSTMENT PROCEDURE FOR

SWITCHES” on page 1. Check proper operation

according to “CHECKOUT PROCEDURE FOR

SWITCHES” on page 6.

(3) Push up and pull out the Control panel Ass’y.

(4) Remove 4 screws securing the Display PCB.

(5) Take out the Display PCB and push up the lever

end of the plastic fastener and remove the FPC

connector from the connector socket S101.

CAUTION:

When replacing new Display PCB please ensure

that all 10 LED heads are positioned exacty into

the square holes of the control frame at once.

Never force any LED head into the PCB.

B.REMOVING INTERLOCK MONITOR AND DOOR

SENSING SWITCH

(See Figure on page 1)

(1) Disconnect all lead wires from the interlock moni-

tor switch and door sensing switch.

(2) Remove 1 screw securing the these switches.

Then pull out the switches.

(3) Make the necessary adjustments or replace-

ment of the switch by reversing step (2) and

check microwave energy leakage according to

“1. ADJUSTMENT PROCEDURE FOR

SWITCHES” on page 1. Check proper operation

according to “CHECKOUT PROCEDURE FOR

SWITCHES” on page 6.

E. REMOVING MAGNETRONS

(1) Remove 1 screw securing the thermal

protector .

(2) Disconnect 2 lead wires from the magnetron

terminals .

(3) Remove thermistor (lower magnetron) by

pulling horizontally.

(4) Remove 4 hex nuts (upper magnetron) or 2 hex

nuts (lower magnetron)securing to the

waveguide.

(5) Remove magnetrons.

(6) Take out the magnetron VERY CAREFULLY.

WHEN REPLACING ANY DOOR MICROSWITCH,

REPLACE ONLY WITH THE SAME SWITCH SPECI-

FIED ON THE PARTS LIST.

NOTES

- When removing the magnetron, make sure that its

dome does not hit any adjacent parts, or it may be

damaged.

- When replacing the magnetron, be sure to install the

magnetron gasket in the correct position and be sure

that the gasket is in good condition.

- After replacing the magnetron, check the microwave

energy leakage to ensure it is below the limit of

5mW/cm². (For US)

C. REMOVING FUSE

Remove the 10A fuse with screwdriver.

NOTES

- When replacing the 10A fuse, be sure to use the

exact repair part.

- If the 10A fuse blows immediately, check the primary

and secondary interlock switch, the relays RL-3 and

RL-4 (on the control circuit board) and the interlock

monitor switch according to “CHECKOUT PROCE-

DURE FOR SWITCHES” on page 6. Make sure to check

the microwave energy leakage according to “1. AD-

JUSTMENT PROCEDURE FOR SWITCHES” on page

1, when the primary and secondary interlock switches,

the relay RL-3 and RL-4 or the interlock monitor switch

is adjusted or replaced.

- After replacing the magnetron, be sure to check the

microwave energy with a leakage detector and

confirm it is below the limit of 1 mW/cm²(at 275cc

water load),5 mW/cm²(at no load) and 5 mW/cm²

(at 275 cc water load without cabinet) when measured

with a detector. (For CANADA)

- 13 -

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HINT FOR LAMP-CHANGE

NOTES

Before removing the bulb access panel, pull out

the main-plug. Change the faulty bulb and secure

the bulb access panel. Plug the cord back in and

check operation.

- After replacing the door, be sure to check that the

interlock switch, the door sensing switch

and the interlock monitor swich operate normally.

(See pages 1 and 6)

- After replacing the door, check for microwave ene-

rgy leakage with a leakage detector. Microwave

energy leakage must be below the limit of

5mW/c ‡u.(For US)

F. CHANGING POWER SUPPLY CORD

(See exploded view on page 15)

- After instaling the door, check for microwave

energy with a leakage detector and confirm that the

leakage is the below the limit of 1 mW/cm²(at 275cc

waterload),5 mW/cm²(at no load) and 5 mW/cm²

(at 275cc water load without cabinet) . (For CANADA)

(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).

I.HOW TO RESET THE MEMORY OF ACCUMU-

LATIVE COOKING TIME

1. Push the keys step by step as follows,

“ CLEAR “, “ TIME “, “ 8 “, “ 8 “, “ 8 “, “ 1 “

“ START “, “ START “.

WARNING:

For changing the power supply cord, never use

other than the following.

The display will show accumulative cooking time

in display window.

Key No. Order No.

Parts Name

Power cord Ass’y

Cord bush

617 140 1318

617 140 1332

617 140 1349

2. Then push the keys as follows.

“ 0 “, “ MEMORY “.

The Memory of Accumulative cooking time will be

cleared.

Bottom bracket

G. REMOVING CERAMIC TRAY ASS’Y

(See Fig.12 )

(1) Take off the cabinet.

(2) Put (insert) a screwdriver in the 9 mm diameter

hole located at the lower hinge of left side of the

oven cavity. Push the tray up with the screw-

driver.

(3) Open the door and take out the tray very care-

fully.

J.RELEASINGTYPE CONNECTOR

This oven is provided with locked type connectors.

When you remove a connector, pull the connector while

releasing the lock by pressing “A” point shown below.

Do not pull the wire of the connector.

Connector:

S1, S2, S102, S104, S105 (Figure 13)

Door

Hole

Figure 13

Figure 14

Pull connector case (Never pull the wire)

Screw driver

Figure 12

H.REMOVING DOOR

Remove 2 hex nuts securing the upper hinge,

remove 3 hex nuts securing the lower hinge and

remove 1 special screw securing the door arm

(located at the bottom of the door sash).

Figure 15

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K. ADDITIONAL FUNCTIONS

The following functions can be completed by the key operation described below.

The Accumulative cooking time and the number of door opening /closings can be observed.

The Type and level of the buzzer sound can be selected. The “display of remaining cooking time when

cooking is temporarily stopped due to door opening” can be selected. The “Accumulative cooking time

period” will inform the service technician of the life expectation of the magnetron or other parts.

Key Operation Step

OPERATION

KEY

DISPLAY WINDOW

•

Press CLEAR / STOP key.

CLEAR

STOP

LOW MED. HIGH

TIME

Press TIME key.

LOW

MED. HIGH

Press 8 three times.

LOW MED. HIGH

Key operations at Step 1 thru Step 3 are common to all functions. Proceed with the key

operation at Step 4 for your desired functions.

• Select the function to press the number key

1 ... Accumulative cooking time.

2 ... The number of door operations. (See “HINT” at Step 6)

3 ... Indication of remaining cooking time (when cooking

is interrupted by door opening).

4 ... To cancel remaining cooking time.

5 ... Tone of the buzzer on cooking completion. (Pip,

Pip, Pip)

6 ... Tone of the buzzer on cooking completion. (Peep)

LOW MED. HIGH

7 ... The buzzer off.

8 ... The buzzer on.

e.g. Number 1 key is pressed for “Accumlative cooking time

period”

•

Press START key.

All 4 digits will be flashing.

START

LOW MED. HIGH

•

Press START key again.

The number “215”shows total cooking time in hours.

When number key other than 1 or 2 is pressed at step 4,

“0” appears in display window and the setting has been

completed.

LOW MED. HIGH

Note:When number “2” is depressd at Step 4 above the

displayed figure shows the number of door operation ••100

e.g. “20” displayed=2000 door operations.

•

Press CLEAR / STOP key to clear the display for the

option 1 and 2. • The function is cleared and “0” will

appear in the display window.

CLEAR

STOP

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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 (See page 13 for more information), the following consumable components should

be replaced.

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

Light

1. Magnetron Tube, Part No. 415 002 6408

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 1370

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.

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8. 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.

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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.

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Main body Parts-2

NOTE: All component have special characteristics for safety and must be replaced usnig 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.

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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.

- 21 -

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