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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 micro-

wave 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.

(c) Before turning on microwave power for any service test or inspection within the microwave generating com-

partments, 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) A microwave leakage check to verify compliance with the Federal Performance Standard should be

performed on each oven prior to release to the owner.

TABLE OF CONTENTS

PROPER USE AND SERVICE PRECAUTIONS

2

SPECIFICATIONS

3

NAMES AND FUNCTION OF PARTS

4

CONTROL PANEL

5

OPERATION

6

INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS

7

PRECAUTIONS FOR DISASSEMBLY AND REPAIR

9

DISASSEMBLY AND ASSEMBLY

10

TROUBLE SHOOTING GUIDE

18

MEASUREMENT

24

COMPONENT TEST PROCEDURE

26

WIRING DIAGRAM

27

SCHEMATIC DIAGRAM

28

EXPLODED VIEWS AND PARTS LIST

31

PRINTED WIRING BOARD

32

P.C.B. BOARD DIAGRAM

37

P.C.B. CIRCUIT DIAGRAM

39

P.C.B. ASS’Y PARTS LIST

40

Содержание KOC-872T0S

Страница 1: ...ment 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 A microwave leakage check to verify compliance with the Federal Performance Standard should be performed on each oven pri...

Страница 2: ... The oven should be placed as far from high temperature source and vapour as possible 3 The power supply cord is about 1 1m 3 6ft long Earthing is required when connecting the power source 4 Maximum power consumption of this oven is approximately 2 7Kw 230V It is suggested that the unit is operated on such power line about 13 amperes that can provide more power than this rating 5 Object must not b...

Страница 3: ...nch CAVITY DIMENSIONS W X D X H 310 12 2 X 320 12 6 X 229 9 0 mm inch NET WEIGHT 17 6 kg 38 9 Ibs TIMER 60 minutes SELECT FUNCTION Microwave Grill Convection Combination MICROWAVE POWER LEVEL 10 stages Specifications subject to change without notice 332 294 320 501 210 398 GRILL COMBI TEMP M W DEFROST PIE PROGRAM COOK 1 ROAST BEEF 2 ROAST PORK 3 ROAST CHICKEN 4 FISH FILLETS 5 VEGETABLE SPEEDY COOK...

Страница 4: ...tron tube will immediately stop operating Ø DOOR SCREEN ƒ Allows viewing of food Microwave cannot pass through perforations in screen Œ GRILL HEATER ƒ Turns on when grill and simulta neous cooking is selected º OVEN LAMPƒ Automatically turns on during oven operating SAFETY INTERLOCK SYSTEM CONTROL PANEL TURNTABLE TRAYƒ Rotates during cooking and ensure even distribution of Microwaves It can also b...

Страница 5: ...sed for more tan 1 3 seconds number is scrolled up automatically DIAL KNOB Used to enter the cooking time and weight input Stop Clear Button Used to pause or clear all information manually put into the oven When blinking the oven is operating in TIME DEFROST When blinking the oven is operating in weight input mode Temperature Button Used to set desired temperature If this button pressed for more t...

Страница 6: ...se all instruction except clock 2 Open the door You can restart the oven by closing the door and touching button ERASING INSTRUCTIONS Touch STOP CLEAR button to erase all instructions you set previously Opening the oven door during cooking dose not erase cooking instruction If you touch button during operation the cooking instructions is all erased NOTE Oven stops operating when door open ...

Страница 7: ...the leakage of microwave 1 Primary interlock switch When the door is closed the hook locks the oven door If the door is not closed properly the oven will not operate When the door is closed the hook pushes the primary interlock switch The hook press the button of the primary interlock switch to bring it under ON condition INTERLOCK MECHANISM FUNCTIONS AND ADJUSTMENTS Mounting screw Hook Primary in...

Страница 8: ...ock switch to bring it under ON condition Adjustment Interlock monitor switch When the door is closed the monitor switch should be opened before other switches close When the door is opened the monitor switch should be closed after other switches open Adjustment steps a Loosen the two mounting screws b Adjust the interlock switch assembly position c Make sure that the latch lever moves smoothly af...

Страница 9: ...t is earthed properly before beginning repair work 2 Warning about the electric charge in the high voltage capacitor For about 30 seconds after the operation stops electric charge remains in the high voltage capacitor When replacing or checking parts short between oven chassis and the negative high terminal of the high voltage capacitor by using a properly insulated screw driver to discharge 4 Whe...

Страница 10: ...the cabinet backward 2 To remove guide wind assembly Refer to Fig 2 1 Release two screws Ł 2 Remove back cover Ø 3 Pull the fan ºto the motor shaft 4 Release two screws which secure the motor shaded pole Œ 5 Reverse the above steps for reassembly DISASSEMBLY AND ASSEMBLY Fig 1 Fig 2 ...

Страница 11: ...sformer Refer to Fig 3 1 Remove four screws which secure the H V Transformer bracket to the base plate 2 Remove the H V Transformer Ł High voltage circuit wiring Fig 3 H V Trans H V Copacitor Mognetron H V Diode H V Fuse 2 1 ...

Страница 12: ...etron without the metallic gasket plate which is packed with each magnetron to prevent microwave leakage Whenever repair work is carried out on magnetron check the microwave leakage It shall not exceed 4mW cm2 for a fully assembled oven with door normally closed Magnetron antenna Wave guide Magnetron antenna Metallic gasket plate Metallic gasket plate Cooling fin Magnetron Filament terminal ...

Страница 13: ...ntrol panel 3 Remove buttons Ø Œ º 4 Remove the Window display Ł REF NO PART CODE PART NAME DESCRIPTION Q TY REMARK 1 3516716320 CONTROL PANEL ABS 1 2 3515501210 WINDOW DISPLAY PMMA 1 SMOG 3 3516905100 BUTTON FUNCTION ABS 1 4 3516906300 BUTTON FUNCTION ABS 2 5 3516906200 BUTTON FUNCTION ABS 1 6 3613404600 KNOB VOLUME ABS 1 7 3516314800 PCB SUB AS KOC 872T 1 8 7121030811 SCREW TAPPING T2S PAN 3X8 M...

Страница 14: ...ng 3 4 Remove the Barrier Screen 4 5 Remove the Handle 6 form the Frame door 5 2 1 REF NO PART CODE PART NAME DESCRIPTION Q TY REMARK 1 3511709000 DOOR SEAL AS KOC 871C0S 1 2 3513101300 HOOK POM 1 3 3515101300 SPRING HOOK PW1 1 4 3517004500 BARRIER SCREEN 0 TEMPERED GLASS 3 2T 1 5 3512203530 FRAME DOOR ABS XR 401 1 6 3512601510 HANDLE DOOR ABS SG 175 1 7 3515203600 STOPPER HINGE T AS KOC 970T1S 1 ...

Страница 15: ...oven body 3 and 4 are same as step 3 A B D C GRILL COMBI TEMP M W DEFROST PIE PROGRAM COOK 1 ROAST BEEF 2 ROAST PORK 3 ROAST CHICKEN 4 FISH FILLETS 5 VEGETABLE SPEEDY COOK STOP CLEAR START PROGRAM COOK Kg TEMP COOK PIE M W GRILL COMBI WEIGHT DEFROST TIME NOTE Small gap may be acceptable if the microwave leakage does not exceed 1mW cm2 NOTE The door on a microwave oven is designed to act as an elec...

Страница 16: ... to Fig 9 1 Cut the tray motor cover parts from the base plate Refer to Fig 9 2 Remove two screws 7 which secure the tray motor 6 and supporter to tray motor bracket 4 3 Remove three screws 1 and under heater assembly 2 in cavity Fig 9 1 2 3 4 5 6 7 ...

Страница 17: ...emove grill heater assembly Refer to Fig 10 1 Remove the cabinet 2 Release hex nut 3 Release two hex nuts Œ 4 Remove Heater bracket º and Top Heater Assembly 5 Remove Top heater Assembly Ø Heater holder Ł Fig 10 ...

Страница 18: ...f primary interlock switch contact with door partially open until interlock monitor switch contact close COM QNC close Replace Note 1 Shorted contacts of primary interlock switch Defective low voltage transformer Defective high voltage transformer Following the procedure below to check if the oven is defective or not 1 Check earthing before trouble checking 2 Be careful of the high voltage circuit...

Страница 19: ...No Continuity Malfunction of Primary Interlock Switch Adjust or replace Check continuity of secondary interlock switch No Continuity Malfunction of secondary interlock switch Replace Check continuity of heater No Continuity Defective heater Replace Check D C voltage being supplied to RELAY RY4 coil 0V Defective touch control circuit Replace Approx 15VDC Faulty contacts of RELAY RY1 or open relay c...

Страница 20: ... magnetron Connect megger leads to magnetron terminal and magnetron body Continuity Replace Defective high voltage transformer Check resistance of primary and secondary coil of high voltage transformer 0 Ω or Replace Defective magnetron Check continuity of magnetron with wires removed No Continuity Replace Defective high voltage transformer Check continuity of filament terminal of high voltage tra...

Страница 21: ...4 coil No Continuity Malfunction of Primary interlock switch Malfunction of secondary interlock and D O M switch Defective touch control circuit Faulty contacts of RELAY 4 or open relay coil Condition Check Result Cause Remedy Adjust or replace Adjust or replace Replace Replace Replace Under heater is not heated Check continuity of primary interlock switch Check continuity of secondary interlock s...

Страница 22: ...is touched 11 Oven lamp and turntable motor do not stop although cooking is finished Check if the RELAY 4 contacts close if they are close replace touch control circuit PROGRAM COOK Kg TEMP COOK PIE M W GRILL COMBI WEIGHT DEFROST TIME NOTE1 Before following the particular steps listed above in the trouble shooting guide for the membrane keyboard s failure please check for the continuity of each wi...

Страница 23: ...3 52 51 50 RA3 RGLD7X104J CA1 B7102M SW101 GRILL SW107 AUTO COOK SW103 min SW106 10sec SW109 STOP CLEAR SW108 START SW102 COMBI SW105 TEMP SW104 PIE SW111 DEFROST SW110 M W SW112 CLOCK 1 AUTO COOK button Between 4 and 10 2 DEFROST button Between 4 and 14 3 C TEMP button Between 8 and 12 4 MICROWAVE button Between 6 and 14 5 COMBI button Between 6 and 12 6 GRILL button Between 2 and 10 7 10 SEC but...

Страница 24: ...following formula T is actual temperature rise t is the heating time The power measured should be 900W 10 2 Electrical Continuity Check of Interlock Switch 2 1 Procedure 1 Primary Interlock Switch 1 Disconnect two connector from Primary Interlock Switch 2 Connect the ohm meter leads between the terminals of the primary interlock switch 3 Read the value of resistance between the terminals of the sw...

Страница 25: ...ain unit surface Measurements should be made with the oven operating at its maximum output and containing a load of 275 15 milliliters of tap water initially at 68 9 20 5 placed within the cavity at he center of the load carrying surface provided by the manufacture The water container should be a low from 600 milli liters beaker having an inside diameter of approximately 85mm 3 11 32 in and made o...

Страница 26: ...age diode is located on the base near the transformer A Isolate the diode from the circuit by disconnecting the leads B With the ohmmeter set on the highest resistance scale measure the resistance across the diode terminals Reverse the meter leads and again observe the resistance reading Meter with 6V 9V or higher voltage batteries should be used to check the front to back resistance may be read i...

Страница 27: ...ERMAL CUT OUT SECONDARY INTERLOCK SWITCH COM NC NO BK BL YW YW YW BK TOP HEATER UNDER HEATER BK BK WH NC RD RD RD RD COM NO WH WH INTERLOCK MONITOR SWITCH H V TRANSFORMER H V CAPACITOR H V FUSE H V DIODE MAGNETRON RD RD BL PRIMARY INTERLOCK SWITCH UPPER CONDITION 1 DOOR CLOSED 2 COOK OFF OL OVEN LAMP FM FAN MOTOR TTM TURNTABLE MOTOR RD RED WH WHITE BK BLACK YW YELLOW BR BROWN BL BLUE GN GREEN GE G...

Страница 28: ... GREEN GE GREEN YELLOW D O M DOOR OPEN MONITOR THERMAL CUT OUT H V FUSE IDLE CONDITION FM TTM OL POWER SUPPLY SINGLE PHASE ONLY L N BL BR FUSE LINE FILTER ASS Y GE RD BR BL GN RD WH WH L V TRANSFORMER FAN RELAY UNDER HEATER RELAY TOP HEATER RELAY D O M SWITCH MOTOR RELAY POWER RELAY CONTROL P W B ASS Y GN BL WH WH THERMISTOR SECONDARY INTERLOCK SWITCH COM NC NO BK BL YW YW YW BK TOP HEATER UNDER H...

Страница 29: ...LOW BR BROWN BL BLUE GN GREEN GE GREEN YELLOW D O M DOOR OPEN MONITOR H V FUSE GRILL COOKING CONDITION FM TTM OL POWER SUPPLY SINGLE PHASE ONLY L N BL BR FUSE LINE FILTER ASS Y GE RD BR BL GN RD WH WH L V TRANSFORMER FAN RELAY UNDER HEATER RELAY TOP HEATER RELAY D O M SWITCH MOTOR RELAY POWER RELAY CONTROL P W B ASS Y GN BL WH WH THERMISTOR SECONDARY INTERLOCK SWITCH COM NC NO BK BL YW YW YW BK TO...

Страница 30: ...TERLOCK SWITCH COM NC NO BK BL YW YW YW BK TOP HEATER UNDER HEATER BK BK WH NC RD RD RD RD COM NO WH WH INTERLOCK MONITOR SWITCH H V TRANSFORMER H V CAPACITOR H V DIODE MAGNETRON RD RD BL PRIMARY INTERLOCK SWITCH UPPER CONDITION 1 DOOR CLOSED 2 COOK OFF OL OVEN LAMP FM FAN MOTOR TTM TURNTABLE MOTOR RD RED WH WHITE BK BLACK YW YELLOW BR BROWN BL BLUE GN GREEN GE GREEN YELLOW D O M DOOR OPEN MONITOR...

Страница 31: ... 32 SW MICRO SZM V16 FA 63 5S762S10G0 2 33 SW MICRO SZM V16 FA 61 5S762310G0 2 34 LEVER LOCK POM 3513701300 1 35 SCREW SPECIAL T2S PAN 4X12 PW SE MFZN 7S341W40B1 2 36 SCREW SPECIAL T2S PAN 4X12 PW SE MFZN 7S341W40B1 1 37 SCREW SPECIAL TT2 TRS 4X8 SE MFZN 7S422X4081 1 38 HEATER T 230V 1100W R2837000X 3512803200 1 39 HOLDER HEATER BRASS C3604BD 3513002900 1 40 BRACKET HEATER U STS430 T0 6 3510603700...

Страница 32: ......

Страница 33: ...oportion to fluctuation of power source voltage NOTE 2 The allowable tolerance of the secondary voltage is within 5 of nominal voltage NO CHECK POINT REMARK 1 PIN 63 64 5VDC 5 2 PIN 29 32 62 0V 3 PIN 28 5VDC 4 PIN 45 5 PIN 30 31 NO MEASURE POINT WAVE FORM REMARK 1 MP 1 5V DC Replace Q3 ZD2 R25 C12 2 MP 2 12V DC Replace D2 D5 EC3 C11 3 MP 3 24V DC Replace D6 EC4 R28 R29 ZD4 NOTE Each measure point ...

Страница 34: ... Segment a 23 Segment b 22 Segment c 20 Segment d 19 Segment e 18 Segment f 16 Segment g 15 Lower bar h 5 Upper bar i 6 8 9 11 MICOM OUTPUT IN PIN NO 24 17 18 16 13 26 25 23 22 21 20 19 14 15 TROUBLE M W AUTO don t come on GRILL PIE don t come on COMBI TEMP COOK don t come on WEIGHT DEFROST Kg don t come on TIME DEFROST doesn t come on Segment a doesn t come on from G1 to G5 Segment b doesn t come...

Страница 35: ...2 When touching M W pad oven lamp dose not turn on Turntable motor dose not rotate but cook indicator in display comes on Cause Relay 4 RY4 dose not operate CHECK METHOD 3 When touching M W pad oven lamp turns on Fan motor dose not rotate but cook indicator in display comes on Cause Relay 5 RY5 dose not operate POINT A B STAGE RY1 ON 5VDC GND RY1 OFF GND 12VDC POINT A B STAGE RY4 ON 5VDC GND RY4 O...

Страница 36: ... heater When touching TEMP COOK COMBI pad oven lamp turns on Fan motor and turntable motor rotate and cook indicator in display comes on Cause Relay 2 RY2 dose not operate CHECK METHOD CHECK METHOD 6 When there is not lower heater When touching TEMP COOK PIE pad oven lamp turns on Fan motor and turntable motor rotate and cook indicator in display comes on Cause Relay 6 RY6 dose not operate ...

Страница 37: ...ETHOD 8 When comes on display CHECK METHOD POINT WAVEFORM A B C T 20ms 60 Hz POINT A B STAGE Door opened Open 5VDC Doop closed Closed GND NOTE Check the state of the secondary interlock switch T 20ms 50Hz CHECK METHOD if clock does not keep exact time you must check Diode D1 transistor Q2 ...

Страница 38: ...37 1 MAIN PCB M212 MP1 MP2 MP3 ...

Страница 39: ...38 2 SUB PCB M213 ...

Страница 40: ...39 P C B CURCUIT DIAGRAM ...

Страница 41: ...103J 4 14 R CABON FILM R2 13 19 20 26 1 6W 1K OHM J RD AZ102J 5 15 R CABON FILM R23 1 6W 510 OHM J RN AZ510J 1 16 R CABON FILM R12 1 6W 330 OHM J RD AZ331J 1 17 R CABON FILM R1 1 6W 100 OHM J RD AZ101J 1 18 R CABON FILM R22 1 4W 120K OHM F RN 4Z1203F 1 19 R CABON FILM R24 1 4W 10K OHM F RN 4Z1002F 1 20 DIODE SWITCHIN D1 1N4148M DZN4148M 1 21 DIODE ZENER D2 8 10 11 1N4002A DZN40022A 9 22 DIODE ZENE...

Страница 42: ...D0 1 37 TRANSISTOR Q1 KTA1270Y TZTA1270Y 1 38 TRANSISTOR Q2 3 KTC3198GR TZTC3198GR 2 39 TRANSISTOR Q4 6 8 9 KRC102M TZRC102M 5 40 RELAY RY1 RY2 G5J 1 TP M DT 12 5SC0101112 2 41 RELAY RY4 RY5 G5B 1 12V 5SC0101110 2 42 R ARRAY RA1 RA3 8P 7 1 8 100K J RA 88X104J 3 43 CONNECTOR FILM CN101 HLEM15R 1 4CW21RBD0 0 03 44 SW TACK SW101 108 110 111 KPT 1115AM 5S50101Z93 0 04 45 SW ROTARY SW109 SDB161VB17F 1 ...

Страница 43: ...AEWOO ELECTRONICS CO LTD 686 AHYEON DONG MAPO GU SEOUL KOREA C P O BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC FAX 02 590 6291 TEL 02 360 7114 590 6151 5 http www dwe daewoo co kr PRINTED DATE Mar 1998 ...

Страница 44: ...Service Manual Microwave Oven Model KOC 872T0S DAEWOOELECTRONICSCO LTD OVERSEASSERVICEDEPT ...

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