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5-9

COMPONENTS

TEST PROCEDURE

RESULTS

HIGH VOLTAGE
CAPACITOR

HIGH VOLTAGE
DIODE

NOTE :
Some inexpensive meters
may indicate infinite
resistance in both direction.

Measure the resistance.
(Ohm-meter scale: Rx1000)
• Terminal to terminal.

Measure the resistance.
(Ohm-meter scale: Rx1000)
• Terminal to case.

Measure the continuity (Forward).
(Ohm-meter scale: Rx10000)

Measure the continuity (Reverse).
(Ohm-meter scale: Rx10000)

Normal: Momentarily indicates

several ohms, and
then gradually returns
to infinite.

Normal:

∞

Normal: Continuity.
Abnormal:

∞

Normal:

∞

Abnormal: Continuity.

NOTE: When testing the magnetron, be sure to install the magnetron gasket

in the correct position and be sure that the gasket is in good condition.

Antenna

Gasket

Chassis

Filament
Terminals

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Summary of Contents for M150TC

Page 1: ...P NO 3828W5S1800 April 2001 Printed in Korea MICROWAVE OVEN SERVICE MANUAL MODEL M150TC CAUTION BEFORE SERVICING THE UNIT READ THE SAFETY PRECAUTIONS IN THIS MANUAL...

Page 2: ...d sealing surfaces arcing wear and other damage 4 damage to or loosening of hinges and latches 5 evidence of dropping or abuse C Before turning on microwave power for any service test or inspection wi...

Page 3: ...CIRCUIT DESCRIPTION 4 4 SERVICE INFORMATION 5 1 TOOLS AND MEASURING INSTRUMENTS 5 1 MICROWAVE LEAKAGE TEST 5 1 MEASUREMENT OF MICROWAVE POWER OUTPUT 5 3 DISASSEMBLY AND ADJUSTMENT 5 3 INTERLOCK CONTIN...

Page 4: ...230 Volts AC 50 Hz 1 250 Watts 5 5 A Single phase 3 wire grounded 900 Watts full microwave power IEC60705 2 450 MHz 2M214 39F 2M218J 2M254J 99 min 50 sec 530 W x 322 H x 394 D mm 348 W x 232 H x 373 D...

Page 5: ...operation of the microwave oven requires that the magnetron be assembled to the waveguide and cavity Never operate the magnetron unless it is properly installed Be sure that the magnetron gasket is pr...

Page 6: ...at surface at least 10 cm 4 inches from the wall 7 Place the microwave oven as far away as possible from TV RADIO COMPUTER etc to prevent interference EARTHING INSTRUCTIONS This microwave oven is desi...

Page 7: ...ooking time WEIGHT Used to select the desired weight 7 COOK TIME Used to cook food for a desired time 8 STOP CLEAR Used to stop oven and clear all entries except time of day CHILD LOCK 9 POWER Used to...

Page 8: ...LESS Operating Sequence Clock Desired minute Start Desired hour Stop Clear Stop Clear Stop Clear Desired power level Desired cooking time Start Stop Clear Stop Clear Touch and Hold Stop Clear Stop Cle...

Page 9: ...SCHEMATIC DIAGRAM 4 3 OVEN THERMAL OVEN THERMAL CUT OUT CUT OUT MGT THERMAL MGT THERMAL CUT OUT CUT OUT...

Page 10: ...imately 2100 volts AC is generated in the secondary of the high voltage transformer which is increased by the action of the high voltage diode and charging of the high voltage capacitor The negative 4...

Page 11: ...ty of the microwave radiation leakage emitted by the microwave oven should not exceed 5 mW cm2 Always start measuring of an unknown field to assure safety for operating personnel from radiation leakag...

Page 12: ...han 1 inch sec 2 5 cm sec along the shaded area otherwise a false reading may result The test probe must be held with the grip portion of the handle A false reading may result if the operator s hand i...

Page 13: ...ature is 5 K The microwave power output P in watts is calculated from the following formula is measured while the microwave generator is operating at full power Magnetron filament heat up time is not...

Page 14: ...Discharge the high voltage capacitor 2 Disconnect the leadwire from magnetron high voltage transformer and capacitor 3 Remove the screw holding the high voltage transformer to the baseplate F FAN MOT...

Page 15: ...load Make sure that gasket is rigidly attached to the magnetron To prevent microwave leakage tighten the mounting screws properly making sure there is no gap between the waveguide and the magnetron L...

Page 16: ...OF THE LATCH BOARD TO THE OVEN ASSEMBLY Mount the latch board to the oven assembly Adjust the latch board in the arrow direction so that oven door will not have any play in it when the door is closed...

Page 17: ...closed meter should indicate an closed circuit When the secondary switch operation is abnormal make the necessary adjustment or replace the switch only with the same type of switch C MONITOR SWITCH TE...

Page 18: ...NENTS TEST PROCEDURE RESULTS HIGH VOLTAGE TRANSFORMER Wire leads removed MAGNETRON Wire leads removed 1 Measure the resistance Ohm meter scale Rx1 Primary winding Secondary winding Filament winding 2...

Page 19: ...e Rx1000 Terminal to case Measure the continuity Forward Ohm meter scale Rx10000 Measure the continuity Reverse Ohm meter scale Rx10000 Normal Momentarily indicates several ohms and then gradually ret...

Page 20: ...e Ohm meter scale R x 1000 POWER LEVEL 20 6 sec 16 sec 40 10 sec 12 sec 60 14 sec 8 sec 80 18 sec 4 sec 100 22 sec 0 sec Normal Abnormal or several Normal Approx 100 200 Abnormal or several NOTE A MIC...

Page 21: ...tatic charge built up in your body Micom model only CONDITION Microwave oven does not work Inserting many plug into one plug outlet and using them at the same time blown fuse or breaker Microwave oven...

Page 22: ...ng cooking cycle 11 Display time of day does not reappear when cooking is finished 12 Beep sound is not heard when correct key is touched 5 12 TROUBLE 1 The following visual conditions indicate a prob...

Page 23: ...P C B Assembly Check continuity of monitor switch with door closed Check continuity of primary switch with door opened Disconnect one side of the wire lead connected from transformer to the high volt...

Page 24: ...s all figures set but oven does not start cooking while desired program times are set and START pad is touched TROUBLE 4 Oven seems to be operating but little heat is produced in oven load NOTE Simple...

Page 25: ...unit Check high vol tage transformer Abnormal Defective circuit protector Replace circuit protector Normal Check circuit protector Abnormal Defective high voltage capacitor Replace high voltage capaci...

Page 26: ...nit NOTE Make sure the wire leads correct position When Removing the wire leads from the parts be sure to grasp the connector not the wires When removing the magnetron be sure to install the magnetron...

Page 27: ...DOOR PARTS LATCH BOARD PARTS CONTROL PANEL PARTS INTERIOR PARTS BASE PLATE PARTS OVEN CAVITY PARTS 6 1 EXPLODED VIEW INTRODUCTION EV...

Page 28: ...6 2 13552A 13213A 13352A 13581A 13720D 13806D 14970A 14026A 15006A 13536A DOOR PARTS EV...

Page 29: ...6 3 24781M 23506A 23572A 268711 WTP018 CONTROL PANEL PARTS EV...

Page 30: ...6 4 33052A 34960A 33390G 35889A 34370T 36549S WTP013 WTT010 WTT021 33112U OVEN CAVITY PARTS EV...

Page 31: ...6 5 43500A 466001 43501A WSZ085 466003 44510A 466001 LATCH BOARD PARTS EV...

Page 32: ...4 WSZ002 WTT028 WSZ062 WTP002 50FZZA WSZ002 WTT037 WSZ002 50CZZH 56324A 55262A 54810C 56851C 56851D 55900A 56549F 56411A 56201A 56930V 34930W 568771 54974S 56912B 948504 948505 948501 56930M 54810A WT...

Page 33: ...6 7 56170D 63302A 63303A WTT021 WSZ002 WSZ062 WTT030 647781 948503 948502 BASE PLATE PARTS EV...

Page 34: ......

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