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SERVICE MANUAL Microwave Oven

SioEM870FS (Nevuealand)

Jan 221992

/

/

Product Code No. 432-328-51

Foreword

Read this manual carefully, especially precaution on microwave energy, and follow the procedure strictly. Careless servicing and

testing may expose yourself to the microwave energy leakage.

PRECAUTIONS

PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO AVOID POSSIBLE EXPOSURE TO EX-

CESSIVE 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.

(cl Before turning on microwave power for any service test or inspection within the microwave generating compartnlents.

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 trans.

mission systems shall be repaired, replaced. or adjusted by procedures described in this manual before the oven is released

to the owner,

REFERENCE NO. WM-fMo 208

P .,., ,

– TABLE OF CONTENTS -

Adjustment Procedures . . . . . . . . . . . . . . . . . . . . . . 1 Automatic Reheat Operation . . . 0 . . 0 . . . . . . , 4-7

Specifications . . . . . . . . . . . . . . . . . . . . . . . . . ...2 Test Procedures and Troubleshooting , . . . . . . . . . 8-14

Power Output Measurement . . . . . . . . . . . . . . . . . . . 2 Disassembly Instructions . . . . . . . . . . . . . . . . . .15-18

Precautions and Repair Service Tips . . . . . . . . . . . . . . 2 Exploded View and Parts List . . . . . . . . . . . . . . .19-24

Circuit Diagram . . . . . . . . . . . . . . . . . . . . . . . . ...3 Overall Circuit Diagram . . . . . . . . . . . . . . . . . . . 25

CAUTION

MICROWAVE RADIATION

PERSONNEL SHOULD NOT BE EXPOSED TO THE

MICROWAVE ENERGY WHICH MAY RADIATE

FROM THE MAGNETRON OR OTHER MICRO-

WAVE GENERATING DEVICE IF IT IS impro-

perly USED OR CONNECTED. ALL INPUT AND

OUTPUT MICROWAVE CONNECTIONS, WAVE-

GUIDES FLANGES, AND GASKETS MUST BE

sECURE. NEVER OPERATE THE DEVICE WITH-

OUT A MICROWAVE ENERGY ABSORBING

LOAD ATTACHED. NEVER LOOK INTO AN

OPEN WAVEGUIDE OR ANTENNA WHILE THE

DEVICE IS ENERGIZED.

1. ADJUSTMENT PROCEDURES

TO AVOID POSSIBLE EXPOSURE TO MICROWAVE

ENERGY LEAKAGE, THE FOLLOWING ADJUSTM-

ENTS OF THE INTERLOCK SWITCHES SHOULD

BE MADE ONLY BY AUTHORIZED SERVICE

PERSONNEL.

PRIMARY INTERLOCK SWITCH, INTERLOCKMONITOR SWITCH AND DOOR SENSING SWITCH

ADJUSTMENT

(Figure 1)

[1)

(2)

\

(3)

(4)

(5)

(6)

Loosen 2 screws securing the lever stopper.

Adjust the lever stopper position so that it is pushed

forward and pull backward until thele is about zero

gap between the latch lever and the switch body

On the primary interlock switch and at the same

time there is about zero gap between the door latch

and the switch body on the door sensing switch

when the door latch is securely locked.

Tighten the lever stopper screws securely.

Make sure the interlock monitor switch closes after

the primary interlock switch opens when the door

is opened very slowly, according to “CHECKOUT

PROCEDURE FOR SWITCHES” on page 6.

Make sure the interlock monitor switch opens

before the primary interlock switch closes when the

door is closed very slowly, according to “CHECK-

OUT PROCEDURE FOR SWITCHES” on page 6.

Make sure the microwave energy leakage is below

the limit of the regulation (5 mW/cm2 ) when

measured with a detector.

(AI{ service adjustments must be made for minimum

micro wave energy leakage readings. )

NOTE:

-1

/

,rews

/= --

--

If the interlock monitor circuit operates

arsd at the same time the fuse blows with

the door opened, be sure to replace the

control circuit board because relay 2 on

the control circuit board, the door sensing

switch and the electric circuit related on

the door sensing switch, which act as

Secondary Interlock Switch.

DoorLatch

‘1 / !-ever Stopper

F j’”/x

DoorSensing

\ , Switch

‘w~= Swich

InterlockMonitor

/) Latch Lever Primary

InterlockSwitch

Figure 1

–l–

2. SPECIFICATIONS

Rated Power Consumption . . .

Microwave Output . . . . . . .

Frequency . . . . . . . . . . . . . .

Power Supply . . . . . . . . . . .

Rated Current . . . . . . . . . . .

Safety Devices . . . . . . . . . . .

Timer . . . . . . . . . . . . . . . . .

Overall Dimensions . . . . . . . .

Oven Cavity Size . . . . . . . . .

Turn Table Diameter . . . . . . .

Effective Capacity of

Oven Cavity . . . . . . . . . . .

Net Weight . . . . . . . . . . . . .

1400W

700W

(Adjustable 155W through

700W)

2,450 MHz f 50 MHz

230- 240V50HZ

6.0 Amp.

Thermal Protector, Open

at 135°C for Magnetron

Fuse (Cartridge Type 8A)

Primary Interlock Switch

Door Sensing Switch and

Relay 2

Interlock Monitor Switch

Electronic Digital, up to

99 min. 99 sec.

550(W) x 453(D) x 309(H) mm

375(W)X 404(D) x 237(D) mm

360 mm

31 liter

Approx. 20 kg

3. POWER OUTPUT MEASUREMENT

(1) Fill two beakers (glass or plastic) with each one liter

of taP water (about 20° C) and measure the water

temperature. (Use a thermometer with a 1/10

degree gauge. )

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

glass tray.

(3) Close the door, set the “TIME” for two minutes.(.,2 O(y? in the display window. ) Touch the

“START” key and heat the water exactlv for two

minutes.

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

and measure the water temperature respectively.

(5) Calculate the temperature rise of water in each

beaker. Then calculate the average value of two

temperature rises.

Output power can be calculated by the equation;

Power output (W) = 70 x At

Where At is an average temperature rise in degrees

Centigrade.

(6) Output shall be in the following range:

Average temperature rise Power output

Minimum 9.O”C 630W

Maximum 11.5°c 805W

(7) Power output is affected by the line voltage under

load. For correct power output measurement, the

line voltage under load must be 240t 1 volts.

4. PRECAUTIONS

PRELIMINARY

A. SINCE NEARLY

AND REPAIR SERVICE TIPS

4,OOO VOLTS EXISTS IN SOME

CIRCUITS OF THIS MICROWAVE OVEN, REPAIRs

SHOULD BE CARRIED OUT WITH GREAT CARE.

B. TO AVOID POSSIBLE EXPOSURE TO MlCROWAVE

ENERGY LEAKAGE, THE FOLLOWING PRE-

CAUTIONS MUST BE TAKEN BEFORE SERVICING.

(1) Before the power is applied:

(a) Open and close door serveral times to make sure the

primary interlock switch, the interlock monitor

switch and the door sensing switch operate proper-

ly. (Listen for the clicking sound from the switches. )

Make sure the interlock monitor switch closes after

the primary interlock switch is opens when the door

is opened.

(See pages 1 and 6)

(b) Make sure the perforated screen and the choke di-

electric of the door are correctly mounted.

(2)

(a)

(b)

(3)

(a)

(b)

(c)

(d)

(e)

(f)

(4)

(a)

(b)

(c)

(d)

(e)

The

After the power IS applied:

Open and close the door to see if the interlock

mechanism operates properly.

Check microwave energy leakage with a leakage

detector and confirm the energy leakage is below 5

mW/cm2.

Do not operate the unit until it is completely re-

paired, if any of the following conditions exists.

Door does not close firmly against the cavity front.

The hinge is broken.

The choke dielectric or the door seal is damaged.

The door is bent or warped, or there is any other

visible damage to the oven that may cause micro-

wave energy leakage.

NOTE: Always keep the seal clean.

Make sure that there are no defective parts in the

interlock mechanism.

Make sure that there are no defective parts in we

microwave generating and transmission assembly.

(especially waveguide)

The following items should be checked after the

unit is repaired:

The interlock monitor switch is connected correctly

and firmly.

The magnetron gasket on the magnetron is properly

positioned.

Waveguide and oven cavity are intact (no leakage of

microwave energy).

The door can be properly closed and the safety

switches work properly.

The oven must be stopped when the door is opened

or the time is up.

oven must not be operated with any of the above

components removed or bypassed.

–2–

,,!

5. CIRCUIT DIAGRAMPoWER SUPPLY

9 =

-$l!

-1 [-

FUSE I I I

8A(T) I L–=–-J 1II

i

7t5”c

II CAVITY LAMP

wBK f

I I

I

I

w

THERMAL PROTECTOR

5

FOR MAGNETRON OPEN

J“ { ‘ C*’

GEAR MOTOR

GMBK

\

r-W~.__——-—\ ~~NNECTOR

.—-— — ——-

1 2

@ LwTr’&k?K\

SWITCH@ !’fwwci

o SWITCH

NC

4+BLOWER MOTOR

CONNECTORHIGH VOLTAGE TRANSFORMER

f————-—— —- —____ __mS201 w i

A.+

i BK-—— . . .

I

[J--I

El I

I

i

:OM

\NO

.) RELAY 2 (

II 3

I CONNECTOR L —-—— ——

- -i

——- — —— < )- J

I 5 S102

. Ii RELAY 1

●

RSTEP 00WN

FUSE DIOOE

I TRANSFORMER~——–_T

I10 I DOOR

‘ c.

, SENSINGDIODE

I

0.97MF0

ICONTROL

ISWITCH

ICIRCUIT

/ BOARD II

10MEG.OHM

I/II

,\ c

CONNECTORI I

JSlol

II1-

L ———— - J-—— ———— ———— ——— —

1 BK I

WIRING COLORNotas: Th.sign @ - Th. parts markad with ❑ ar. s.rw,i.d

high voltage which is ●xcaadad 250V.

BK : BLACK BR : BROWN Tha sign @ - The Patts markad with @ hava special

w : WHITE GY : GRAY charactcristia important for microwav-

o : ORANGE BL : BLUEIoakage. When replacing sny of thase parts

R : REDuse only manufactur,’s spacifiad parts.Figure 2

–3-

6. AUTOMATIC REHEAT OPERATION

Automatic reheat is controlled by a humidity sensor.

Power level, reheating time, doneness temperature and

quantity of food donot need to beset.

The humidity sensor detects moisture asit escapes from

the food being reheated.

The microprocessor on the circuit board receives the

signals from the sensor and controls the power level and

the reheatng time automatically.

A. HOW THE HUMIDITY SENSOR WORKS FOR “AUTO-

MATIC REHEAT”

The humidity sensor is located on the left rear ofOven Cavitv. (Figure 5)

This sensor detects an amount of moisture as it escapes

from the food and the amount of moisture is closely

related to the doneness of the food being reheated.

The sensor is composed of two thermistors. One is

sealed in a dry air compartment and the other is in an

open compartment. (Figure 4)

The both thermistors are heated by themselves at about

200°C when the oven is plugged in. The thermistor in

a dry air compartment is cooled by the influence of air

temperature and the thermistor in an open compartment

is cooled by not only the air temperature but also evapo-

ration of the moisture in the air around the sensor.

If the sensor is in a dry air, the both thermistors in the

sensor have the same resistance value, regardless of the

air temperature.

But if it is in a moist air, the thermistor in an open com-

partment will be cooled more by evaporation of the

moisture and the resistance value will increase, compared

with the thermistor in a dry air compartment.

This develops a difference between both thermistors in

resistance value.

The sensor sends that information to the micro com-

puter, which calculates and automatically adjusts the

power level and remaining operating time.

J=ii3=-o---

==0:=-=- _-0.

Q

Outside of

Humidity Sensor

Figure 3

Thermistor Thermistor

\ Moist Air /

Dry Air- Open’

Compartment Compartment

Inside of

Humidity Sensor

Figure 4

–4–

.

B . EASY USE CHART 2 DONENESS KEYS1. Touch CLEAR

2. Touch a Categcxy Key

REHEAT l(for A 1) mREHEAT2(fof A2)

3. Touch a Dcneness Key

LOW M HIGH if desired

4. Touch START

Note: About 5minutes after the oven is first Plugg-

ed for stable operation of a humidity sensor.

Use ‘Automatic Reheat- after waiting 5minutes.

-CATEGORY

8 AUTOMATIC SENSOR COOKING COURSES ‘

a) 2 COURSES OF AUTOMATIC SENSOR REHEA -

-.

TING fcr heating pecooked focds.

~

REHEAT 1:Preccoked Rcorn Temperature

and Refrigerated Temperature Food..

REHEAT 2:Preccmked Frozen Dense Fo-A2 ~s

b) 6 COURSES OF AUTOMATIC SENSOR COOKl-

NG for cooking fresh or frozen fcxxk.

couRsE# lFOOD CATEGORy ]COURSE#l FOOD CATEGORY

The oven automatically sets to medium if no selec-

ticm is made.

If you prefer to have your food reheated or cooked

moore or less than the preset medium setting, touch

cne of the two DONENESS keys befcx tcuching START.

When a different doneness is chosen from the pres-

et medium (2), it is confirmed with a number(l to 3)

in the course indication display.

The indication ‘Al -2-for-REHEAT 1- changes as a

different doneness is entered.

Dcmeness Setting Ccurse Indication

LOW -Al-l-

medium ‘Al -2-

(preset position)

HIGH ‘Al -3-

The indication ‘C4-2”for-Rl CE- changes as a dif -

ferent doneness is entered.

1 Doneness Setting Course Indicationt

LOW -C4-1 “medium ‘C4-2-

( preset position)

HIGH “c4-3-

Imml

–5–

C. POINT TO REMEMBER

● Before using Auhxnatic Sensw Programs...

The oven should be plugged into power supply for

more than five minutes.

Wipe off any noticeable moisture or spillovers fr-

om the wen.

If the inside of the oven is very warm, wait until

it cools down.

Automatic Sensor may not operate properly if the

room temperature is higher than 95”F(35°C ).

● Do not touch STOP/CLEAR, once cooking starts.

This will void the Automatic.

Sensor program and the food will need to be finis-

hed by using regular micrcwave operation.

● Make sure to use the correct food category or reh-

eat course for the food that is to be reheated or

cooked.

. The oven door must remain closed while display sh-

ows course indication (- C1-2-, -C2-2., -A1 -2-

and so cm) unless ‘PAUSE- appears in the display.

If the door is opened, -Err- (error) will flash in

the display. This indicates the operation must be r-

reprogrammed into the oven. NOTE: The oven door may

be opened when time countdown appears in the disp-

lay.

. Automatic sensor cannot be used with other functi-

ons such as Time, temperature probe, Auto Defrost.

When the Temperature Probe is plugged in and Auto-

matic Sensor Cooking is started, the word ‘Probe”

will flash and the oven will not work.

–6–

7. INTERNAL AIR FLOW

The blower motor always runs during cooking or reheating. The air from the blower divides into two ways as shown in

Figure 5. This prevents the sensor from being affected by the warm air which has no relation with the doneness of food

being reheated.

(1) Air flow for rotating the stirrer fan

Air flow is shown by solid arrows in Figure 5.

The air from the blower cools the magnetron and

becomes warm. The warm air goes into a stirrer

compartment to rotate the stirrer fan.

(2) Air flow for carrying the moisture escaping from

food to the sensor

Air flow is shown by shaded arrows in Figure 5.

The air from the blower motor goes into cavity

inside and carries the moisture escaping from the

food being reheated to the sensor.

CAUTIONS:

- The stirrer cover inside of the oven cavity acts as an airpartition between the air for rotating the stirrer fan and

the air for carrying the moisture escaping from food to

the sensor. The stirrer cover must be secured p,”operly.— The oven cabinet (outer wrap) acts as an air wide. The

stirrer fan may not rotate properly and the sensor may

not detect the moisture escaping from the food properly

while the oven cabinet is removed.

AirHumidity Sensor

Exhaust/

Figure 5

–7–

Air

Intake

I Blower

?\, , RFilament Windings

8 .TEST PROCEDURES AND TROUBLESHOOTING /“1

rc””’’””~DISCONNECT THE POWER SUPPLY CORD

FROM THE WALL OUTLET WHENEVER RE-

MOVING THE CABINET FROM THE UNiT, PRO-

CEED WITH THE TESTS ONLY AFTER DIS-

CHARGING THE HIGH VOLTAGE CAPACITOR

AND REMOVING THE LEAD WIRES FROM THE

PRIMARY WINDING OF THE HIGH VOLTAGE

TRANSFORMER. (SEE FIGuRE 6 )

A. TEST PROCEDURES

COMPONENT

MAGNETRON

HIGH-VOLTAGE

TRANSFORMER

s

CHECKOUT PROCEDURE

1) Check for resistance: Across the filament

terminals of the magnetron with an ohmm-

eter on R x i scale.

1 r

ohm-meter

w

2) Check for resistance: Between each fila-

ment terminal of the magnetron and the

chassis ground with an ohm-meter on

highest scale.

ohm-meter

G

Q

Figure 8

1 ) Measure the resistance:

With an ohm-meter on R x 1 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.

ohm-

Note:

measured point.

Figure 6

RESULT

Normal reading:

Less than 1 ohm.

Normal reading:

Infinite ohms.

Normal readings:

Approximately 1.4 ohms.

Less than 1 ohm.

Approximately 87 ohms.

Normal readings:

Infinite ohms.

Infinite ohms.

–8–

‘COMPONENT

HIGH-VOLTAGE

CAPACITOR

including

BLEEDER

RESISTOR

HIGH-VOLTAGE

DIODE

t-

FUSE DIODE

CONTROL

CIRCUIT BOARD

CHECKOUT PROCEDURE

Measure theresistance: Across two terminals

with an ohm-meteron highest scale.

Figure 10

Measure the resistance. Across two terminals

with an ohm-meter on highest scale.

ohm-metern

a

bFigure 11

Measure the resistance: Across two terminals

with an ohm-meter on highest scale.

Ohm-metern

Measure the voltage: Between test points

TP-1, TP-2, or TP.3 and ground between TP-

4, TP-5 and TP-6 (See control circuit bo-

ard on page 24)

NOTE

Proceed with the check of the step-down

transformer, to see if any one of the measur-

ed values is different from the specified

values.

RESULT

Normal reading:

Momentarily indicates several ohms, and

gradually returns to 10 meg-ohms.

Abnormal reading:

Indicates continuity or 10 megohms from

the beginning.

Normal reading:

Indicates about the middle position in one

direction (forward direction) and infinite

ohms in the reverse direction, using meter

which is provided with a 9-volt battery.

NOTE

– Some digital meter may show over even

in a forward direction because low measur-

ing voltage of meter does not allow the

meter current to pass through the high

voltage diode.

Abnormal reading:

Indicates continuity or infinite ohms in both

directions.

Normal reading:

Indicates infinite ohms in both directions.

Abnormal reading:

Indicates continuity in both directions or

continuity in one direction and infinite

ohms in reversed direction.

Test

Point‘P-4’ TP-6

‘p” ‘ ‘P-2 ‘P.3 TP-5

–5V –12V –30V 2.OV +1.5VVoltage Dc DC Dc Ac Dc

–9-

-. ,’

.

COMPONENT

TOUCH KEY

BOARD

CHECKOUT PROCEDURE

Measure the resistance between terminals of

FPC connector after removing i\ from SIO1.

(Figure 13)

NOTE

When reconnecting the FPC connector,

make sure the holes on the connector are

properiy inserted in hooks of the

fastener in S101.

MATRIX CIRCUIT FORTOUCH KEY BOARD

FPC CONNECTOR

plastic

---- —— —.. — —-—— ——— ——— . -ii

-1

I

I

I

IIIII

RESULT I

EEEazaWhen checking “START” key, connect ohm-

meter as illustration below.

aG3ohm-meter

Top \\-

F-/t---TERMINALS OF FPC CONNECTOR

Figure 13

CHECKOUT PROCEDURE FOR SWITCHES

Disconnect the lead wires from the switches and check for the continuity of the switches connecting an ohmmeter to its termi.

nals.

1SWITCHES

(See Figure 1 on page 1)CHECKOUT PROCEDURES DOOR OPEN DOOR CLOSED I

Primary InterlockTerminals “COM” and “NO”

Door Sensing

Q @;

Interlock Monitor Terminals “COM” and “NC”

I

a @!

CAUTION: After checking the switches,make sure that the interlock monitor switch is ProPerl Y connec[ed according tO [h s

CIRCUIT DIAGRAM on page 3.:

m“

–lo–

,; !:

B. TROUBLESHOOTING ,..,....!. ...

. ,

.....1,, .... . ...’.!

STEP SEQUENCE RESULT

1) PROBLEMI

10 display or mis.display in

II

~edisplay window by touch,

I m

I ,1,

0 24019 the keys.

@

I

t @It

Ja o Vol

o–1vCheck continuity. of Replace it i Runs

thermal protector for if necessary. I

magnetron and AC Power1

cord. If the fuse is below.I

See “F. REMOVINGII

FUSE” on page 17. I1

Check 240 VAC power supply ithrough fuse (8A) and

t!wrnd pr9bxh2r fw[ PROBLEM

.- ..= ..._

Magnetron,.—...— . . __ -.. . .- . .. . . . . .. . . . . ....= ----- . ..

I 14?1’

240 vOltI

I

I

I

,,’

:

‘.

,,,,

.:,,,.,

,’.‘,,,,

,;’,

,,:.

‘.’.,,

,., -..; ‘.*.’.

,,.. .

.,

:.’,.

,>

. . .,

,,

.,,,:

bI

Conlrol

circuit board

Check power supply voltage

on control circuit board.

(See page 9)

Touch key board

? *000000000

Each voltage Check resistance of

OK touch key board,

(See page 6)

1

@

l,’

I‘@I

Each resistance Correct seating of Normal control I Runs

OK connector S101 or circuit board II

replace control I

circuit board. III

r I

@

000000000 I

I

Resistance Replace touch key Normal touchII Runs

incorrect board, key board I

(ON or OFF)IIII

@

I*”‘@II

Voltage Replace control Normal control ~ Runs

Incorrect circuit board. circuit board IIII

,..,.,..’,,,

,:

.,,,

.’, .

.,,,.‘.‘.,,.,.:,,.,

,!

,,.

. . . .

.:.

.

}..

., ..;.,,

‘,,

,.:,.

“. ,,,:.,, :.:,.;

9

CTcn RF~ll FNCF RESULT

,,‘,, .,., ,

.,.;.

.;

,,

,,, ,

.“, :,,.,,.:.

. . .,.

,.

,.

..:. :

,’,’,,.’...,.,,

i,

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.,, ,.,,,..,

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.,,,.’.

,,.’,’,,,.,,,. ,.,. ,,..

:,.‘, .’... ,... ,,.’. .

Ih)

I

oiLr --------- --

2) PROBLEMII

hoking operation will notII

tart. I

CHECK: 1. Power Supply to OvenI

a2, Primary Interlock Switch

I

3 Thermal Protector for Magnetron

-a

II PROBLEM

3-alb

ContactI1

OK II

i

Door sensing switch1

Continuity Check contactI

D

Io OK of connector

-a—@-a

1~1,

●S102. I

Check continuity of con.I‘@

nector S102 between Pins

(0 W( DL) wilh tho door

Poor Correct NormalI

cQntact seating, contactclosed after rerrtthrin~connector S102 from

‘-’-” ‘-” ‘“’ :

.._. _@ (–). .~@

control circuit board.No AdjusI or replace Normal door 1 Rum

continuity door sensing switch. sensing switch i(See page 11 1

(3) PROBLEM

,

Oven does not heat up.

II1,

I ~~~~L~ti

a I 3b

AC 240 Volts

IIIII

Touch START key and

:I ~)

measure voltage between

@

1

J@

.

white wire Iea[l and blackwire lead for primary

I

winding of H.V. trans.I

o volts Replace control Runs

tormer afler removingNormal control I

——. —.. —..the wire le~ds from

circuit board, circuit board

termtnals of H,V. trans.

:I—.—

former. I—— I,, .:’,.’ . . . I

“-

}..iLc..,.:uLiLLz:au1-U

-i-f

-------—

----

----------

‘1

-.—.

.--—+

+-—

-------

---------

----

6‘--lI\/

.-

1I

–13-

‘,..,,

SEQUENCE RESULT

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,,,

‘, :

,,,,,.

.’,.,,,.’.

,, .’,,

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. . . ..,..

UVLV

I5) PROBLEM‘he magnetron operates on

I

Iigh level when a lower cook

I

I}ower is selected. I

Ia

m

No problem.

Measure water

‘u

temperature

aH.V. transformer. rise exactly.

E&

Voltage cycleson and off.

iII

mI

Towh START key andI

@

I a’.: ‘tSet fmwei level fiie~stire volfage bebA@en

‘“” - ‘“”” ‘“- ‘“--”” -

. . ..—.-. . -,.

at “50”. white wire lead and black ‘@I

wire lead for primary I

winding of H.V. trans- 240V Replace control Normal control 1 Runs

former after removirq circuit board. I

the wire leads fromcircuit board ,

terminals of H.V.I

transformer.III

II1

[6) PROBLEM I

No buzzing by touching keys I

and at the end of cooking. I

~-

!II1II

@

: *’”.

I‘@

Check normal operation

I

Replace control Normal control I Runs

of control circuit board. Icircuit board. circuit board I

II

:

. ,, .,

.’, , ,.:~ :.,, . . ... It

I

‘1,,

Ell

9. Dl$AssEMf3LY INSTRUCTIONS

●

●

A.

OVEN MUST BE DISCONNECTED FROM ELECT-

RICAL OUTLET WHEN MAKING REpLACEMENTS,

REPAIRS, ADJUSTMENTS AND CONTINUITY

CHECKS BEFORE PROCEEDING WITH ANY RE-

REPAIR WORK AFTER DISCONNECTING. WAIT AT

LEAST I MINUTE, UNTIL THE CAPACITOR IN THE

HIGH-VOLTAGE AREA HAS FULLY DISCHARGED.

WHEN REPLACING ANY DOOR MICROSWITCH,

REPLACE WITH THE SAME TYPE SWITCH SPECIFIC

ED ON THE PARTS LIST.

REMOVING DOOR SENSING SWITCH

(Figures 1 on page 1, 14-a)

(1)

(2)+.7 )

.. ““

(4)

(5)

Disconnect all wire leads from the door sensing

switch. (Figure 1 on page 1)

Remove 2 screws securing the lever stopper.

Push the door sensing switch upward while pressing

adjacent upper switch stopper of lever stopper and

lower switch slopper down (Figure 14-a).

Then remove it by lightly pressing the switch to-

ward you. (Figure 14-a).

Make necessary adjustments or replacements of the

door sensing switch by reversing step (3) and check

microwave energy leakage according to ‘“l. AD-

JUSTMENT PROCEDURES” on page 1, after it is

replaced with new one, and check proper operation

of it according to “CHECKOUT PROCEDURE

FOR SWITCHES” on pagelo.

-.

Lower”SwitchStopper Figure 14-a

UpperSwitchStopper

..

B. REMOVING PRIMARY INTERLOCK SWITCH AND

INTERLOCK IMONITOR SWfTCfi

(See Figure }+b) -

(1)

(2)

(3)

Disconnect all wire leads from primary interlock

and interfock monitor switch.

Pull the primary interlock switch or interlock

monitor switch upward at the same time while

pushing the switch stoppers to allow a space be-

tween the switch body and catches.

Make necessary adjustments or replacement of

switch by the reversing step (2) and check micro-

wave energy leakage according to “1. ADJUST-

MENT PROCEDURES” on page 1, after it is re-

placed with new one, and check proper operation

of it according to “CHECKOUT PROCEDURE

FOR SWfTCHES’” on pageltl

Switch Stoppers

x--I fcterlockMonitor

, Switch

%/ I PrimaryInterlock

11 ,1 Switch

Switch stoppers

Figure 14-b

~

Interlock Swilch Replacement – when replacing

faulty switches be sure sw]tch mounting tabs are not

bent, broken or o:herwlse deflclent In their ablllty

to secure the switches in place.

-15–

C. REMOVING BLOWER MOTOR

(Figures 15 (TOP View) and 16)

(1) Remove screw securing the stay.

(2) Disconnect all lead wires from the blower motor

and H.V. capacitor.

(3) Remove 2 screws securing the blower base and

disengage 3 hooks from the rear plate of cavity

(Figure 15).

(4) Remove 1 screw securering the blower motor with

the blower base.

D. REMOVING MAGNETRON

(Figure 15 (TOP View))

After removing the blower motor:

(1)

(2)

(3)

(4)

(5)

Remove duct (msg. intake) and duct (msg. exhaust).

Remove 2 screws securing the thermal protector.

Disconnect 2 lead wires from the magnetron.

Remove 3 screws securing the magnetron to the

waveguide.

Take out magnetron VERY CAREFULLY’

NOTES

When removing the magnetron,

its dome does not hit any adiacent

be damaged.

make sure that

parts, or it may

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, be sure to check

the microwave energy leakage with a leakage detec-

tor and confirm the leakage is below 5 mW/cm2.

Duct (msg. exhaust)Blower base

\ I

L , / IStay I$uct (msg. intake)

Figure 15 (TOP view)

... .

Screw\

&~’r;:::;.::::;..::::;::..........................-.....................4/4/:..::::....:....-.::.::::............Z..

.:::- . . . . . . . . . . ..::::::......:::::--.::.<::. . . . . . . . . . . . . . . . .: . . . . . .. . . . . . . . . .: :::::::..:::::::::~

:::....:::;. .::::.:----............. ......................... ...::::... lb3 Hooks.:: :..- ...-.. . . .. ... . . .......... ....

Blower Motor \Screws

Figure 16

.-.

..

E. REMOVING FUSE

Remove the 8A fuse with a screwdriver.

NOTES

— When replacing the 8A fuse, b+?sure to use an

exact repair part.

If the 8A fuse blows immediately, check the

primary interlock switch, the relay 2 (on the control

circuit board) and the interlock monitor switch

according to “CHECKOUT PROCEDURE FOR

SWITCHES” on pagel O. And make sure to check the

microwave energy leakage according to “1. AD-

JUSTMENT PROCEDURES” on page 1, when the

primary interlock switch, the relay 2 or the inter-

lock monitor switch is adjusted or replaced.

– If the primary interlock switch, the relay 2 and

the interlock monitor switch operate properly,

determine which of the followings is defective:

control circuit board, blower motor, high voltage

transformer, high voltage capacitor, high voltage—diode or magnetron.

– If the high voltage diode is defective, replace not

only the high voltage diode but also the fuse diode,

F. REMOVING CONTROL CIRCUIT BOARD

(See exploded view on page 22 and Figure 17)

(1)

(2)

(3)

(4)

(5)

Remove the connector S1, S102 and the connector

for the relay 2 from the control circuit board.

Remove 1 screw securing the control panel com-

plete to the oven cavity,

Remove the FPC connector from the connector

S101 while grasping UP both lever

plastic fastener.

Remove 3 screws securing the control

to the control base.

Lift up the control circuit board from

and take it out from the control base.

ends of the

circuit board

its lower side

G. REMOVING TOUCH KEY BOARD

(Figure 18)

After removing the control circuit board;

(1)

(2)

(3)

Remove control base while lifting it up at the right

side and take it out from the control frame.

Remove control sheet which is glued to touch key

board.

Remove the touch key board which is held on the

control base bracket with the adhesive tape.

Control Base

Control Frame

Figure 17

Control Sheet

TouchKey Board

–17–

H. REMOVING DOOR

1.

(1) Remove 2 hex nuts seturing the upper hinge.

(2) Tilt the top of the door toward you.

(3) Lift up the door to remove it.

NOTES

- After replacing the door, be sure to check that

the primary interlock switch, the door sensing

switch and, the interlock monitor switch operate

normally. (See page 1)

- After replacing the door, check for microwave

energy leakage with a leakage detector. Microwave

energy leakage must be below the limit of 5 mW/

cmz.

DISASSEMBLING DOOR

(Figure 19)

(1)

(2)(3)

(4)

Insert a thin flat-blade screwdriver between the

choke dielectric and the door main frame and lift

up the choke dielectric to release hooks one by

one. (Figure 191

Remove the choke dielectric.

To detach the doot cover, Insert a thin flat-blade

screwdriver between door cover and the door panel

and release the projections inside door cover.

To detach the door panel, Insert a thin flat-blade

screwdriver between the door cover and door main

frame.Hooks

Hooks

DoorMain I

ChokeDielectric

NOTES

– The choke dielectric may be damaged when it is

removed. When reinstalling it replace it with new

ones if they are damaged.

- Atter installing the door in the place, check for

microwave energy leakage with a leakage detector.

Microwave energy leakage must be below the limit

of 5 mW/cm2.

J. REMOVING STIRRER FAN

(Figure 20)

(1) Release the 3 hooks of stirrer cover while pushing

them downward at the front of the cavity toP.

(2) Remove the stirrer cover from the hooks at the rear

side of the cavity top pulling it toward you.

Stirrer A’ssy

/ \,

\Stirrer Cover

Figure 20

K. REMOVING TURNTABLE MOTOR COVER

(Figure 21)

(1)

(2)

(3)

(4)

Turn over the oven on its back.

Cut the 6-joints of the bottom plate using diagonal

pliers (nipper).

Separate the motor cover from bottom plate.

Remove 2 screws securing turntable motor to the

cavity and take it out.

Note: Bent the cut joints inside slignt[y for safety

and be careful of sharp edge.

Motor Cover

6 Joints / Bottom Plate

\ /

Figure 21

–18–

. . .i

8. EXPLODED VIEW AND PART LIST

CAVITY PARTS

21

a

16 II //

—

*** ALL SERVICE ON MICROWAVE OVENS SHOLJLD BE PERFORMED BY A QUALIFIED TECHNICIAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED

BY ATRIPLE ASTER ISK(***)

icyNo.1

234

5

6

7

8

9

10

11

12—

Part No.

6171246377

411 0825201

411 0654102

6171307450

6171246391

6170561600

411 0110802

6171240795

4110892500

411 001 4704

6171305616

617 120 B481

Description Q’ty

Cabinet (Also order Circuit Diagram-

when replacing Cabinet. J 1Screw, Truss Hd. Tapping, 4 x 10mm 11

Lockwasher, External Tooth, 4mm, U 2

Own Cavity*** (Not service Part) 1

Bottom Plate” ● “ 1Plastic Foot with Canoe Clip 4

Bolt, Hex. Hd. Machine with

Spring Washer & Bolt Washer,

5x 14mm, Zl *** 2Hinge Lower” ● ” 1

Washer, 5mm, U 1SCR S-TPG PAN 4 x 10mm 2Gear Motor M2 LJ50ZA 12 1Insulation Sheet 1

KeyPart No.

No.Description a’ty

13

14 6171147162 Turn table Shaft 115 617 1242416 Roller 116 617 1098372 Rotating Tray 117 61712 B1149 Ouct, Humidity Senser 118 617 1269994 Humidity Sensor 119 411 0076900 Screw, Pan Hal., Tapping, 3 x 6mm,

C2-2 120 617 1307481 Stirrer Cover 121 617 1265484 Stirrer A’ssy 122 617 1325720 Insulation Sheet 1

. 617 1385182 Name Plate 1

. 6171385175 Circuit Diagram 1

Items not illusmated.

–19–

SWITCHES AND MICROWAVE PARTS

Notes: The sign

The sign

Pam marked withvoltaga which is

parts marked with

10

—characteristics important for microwave

.

leakage. When repl=mg any of these partsuse only manufacturer’s specified pare.

““” ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNICAN USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEMPT TO REPLACE PARTS IDENTIFIED BY

A TRIPLE ASTERISK””*)

KeyPart No.

NO.Description Q’ty

1 411 0825201 Screw, Truss Hd. Tapping, 4 x 10mm 52 6171305661 Power Supply Cord Complete 1

3 6171306941 High Voltage Transformer, H5T-

800SAP 1

4 6171289718 Duct, Meg. Inlet 1

5 6171246582 Stay, Cavity & Magnetron 1

6 411 0076900 Screw, Pan Hd. Tapping, 3 x 6mm

C2-2 2

7 6171241259 Thermostat, Magnetron, 135C0 1

8 4150019301 Magnetron, 2M218H(N)””” 1

9 1111111111 Fuse, 250V 8A 1

10 6171343212 P.C. B Complete 1

11 6171170023 Lead Wire Ass’y with Diode 1

12 6171315868 Lead Wire Ass’y (Transformer to

Capacitor) 1

13 6171241334 Capacitor 8and 1

14 6171306934 High Voltage Capacitor including

Resistor, 0.97uf 2.4KV 1

15 6171241082 Space Partition (Blower) 1

16 6171306927 810wer Motor BM-800SAP 1

17 411 0772109 Screw, Truss Hd. Tapping,

4 x 20mm, Z1-1 2

18 6170751179 Blower Fan 1

GNo.19

20

21

22

23

24

25

26

27

28

29

30

31

32

33

34

Part No.

411 011 5609

6171241075

6171103618

6171241280

6171241181

6171242294

6170045575

6171124583

6171241174

6171241198

411 1102608

4120182004

411 0081607

411 0014704

411 0541903

6171325713

Description

Bolt HEX C-SCT 4 X 20

Duct, Msg. Exhaust

Lamp, 240V 25W

Lamp Socket

Latch Lever*”*

Micro Switch, PrimaW Interlock

V-5130D*””

Micro Switch, Interlock Monitor

V-5220DZ* “ “

Micro Switch, Door Sensing

V-523 OD-1O3”*”

Lever Stopper**”

Latch Lever*””

Screw, Pan Hd. Tapping + TW,

4x 12mm, Zl

Bolt Hax C-SCT 5 x 16

Spring Washer 4mm

Screw, Pan Hd. Tapping,

4 x 10mm, Z1

Nut Hex + FLG WISRT 5

Insulation Sheet

Q’ty

3

1

1

1

1

1

1

1

1

1

2

2

1

1

2

1

-.—AJ—

. . ..fi

DOOR PARTS

1*’\

‘“A

““” ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED TECHNIC IAN.+ USING

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT ATTEIVIPT TO REPLACE PARTS IDENTIFIED

BY A TRIPLE ASTERISK**’)

KayPart No.

NO.Description Q’ty

1 6171246469

2 6171246476

3 6171246414

I4 6171246490

5 6171246483

Door Cover*””

Door Panel” ““

Door Main Frame”” ● (Also order

Door Sheet when replacing Door

Main Frame)

Choke Dielectric* ““

Door Sheet” ● ”

11

1

1

1

6 411 0541903 Nut. Hex. Hd. with Washer, 5mm 21 [

Key

No.

7

8

9

10

11

Part No.

6171240955

411 011 0802

6170806503

617101 1494

617101 1487

/“’”

10 ...

Description Q’ty

Hinge, Upper”** 1

Bolt, Hex. Hd. Machine with

Spring Washer and Bolt Washer,

5x14mm, Zl ”** 2

Rivet*”* 2

Spring”** 1

Door Latch ● ● ” 1

–21–

----‘.

CONTROL PANEL PARTS

● ☛✎

.,.*’\‘N

9

\ 11 ● **

ALL SERVICE ON MICROWAVE OVENS SHOULD BE PERFORMED BY A QUALIFIED

APPROVED TESTING EQUIPMENT. CUSTOMERS SHOULD NOT AITEMPT TO REPLACE

BY A TRIPLE ASTERISK**”)

,

t-’-Key

Part No.NO.

1 6171313215

2 617131 3222

K!ME

Description Qty

Control Sheet (Also order Touch IKey Board when replacing Control

Sheet) 1

Touch Key Board””” (Also order

Control Sheet when replacing

Touch Key Board)

Control Plate”””

Control Frame**”

Lockwasher, External Tooth,4mm

1

1

111

PRINTED MATTER (Item Not Illustrated)1

‘ey I Part No. \ Description I Q’tyNo.

6171313277 Operating instructions 1

617138519~ Carton Box 1

TECHNICANUSING

PARTS IDENTIFIED

KeyPart No.

No.Description Q’ty

6 411 0825201 Screw, Truss Hd. Tapping,II

7 6171284089

8 6171305173

9 411 1295805

I10 6170809559

11 6171246612

4x 10mm, U1-1

Control Base**”

Control Circuit Board Complete

Screw. Bind Hd. Tapping,

3 x 10mm, ZK-1

Spring, Ooor Release Lever”*”

Door Release Lever”” ●

111

2

2

2

–22–

<., “ii

CONTROL CIRCUIT BOARD

(Part No. 617-130-5173)

2.

TP-4

TP-5

TP-6

TP.

— TP-3

— Ground

— TP-2

—1

.,

l———

——

—--

-——

—___

____q–.

_._.--_.

–---.---,

IIh

Ill ...

..

.,..

._Y

t‘

I1.

I:

;:7

;E,

I

t--

~o.

!w”..!:

:~

..

..

..

..

..

..

..

..

II

.-J.

_--_-l

.,,,I

B19BW1

t~olI1IIIIIIII

-J

““IWW

-I“’“‘

0mN

It

3CJ

,I

iiI_–__-__

–------l,.-

.-1.

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,...

SANYO NEW ZEALAND LTD