Daewoo KOC-9Q4T microwave
Contents
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3. 4 NS E en L ELT NOTE When electric parts are checked be sure the power cord is not inserted the wall outlet l Check wire harness wiring and connection of the terminals and power cord before check the parts listed below ze A l TROUBLE 1 Oven does not operate at all any inputs can not be accepted CONDITION CHECK RESULT CAUSE REMEDY Fuse blows gt Check continuity of gt Continuity HF Malfunction of gt Replace interlock monitor switch with Interlock door closed COMONC monitor switch COMONC L No continuity Check continuity of a No Malfunction of Replace both primary and secondary Continuity interlock switch interlock switch with door closed gt Continuity m Continuity gt Replace Check continuity of ie contacis primary interlock switch contact with Wi pe itch door partially open until interlock Were SWIG monitor switch contact close COMeNC close gt 0 Qor infinite gt l m Replace Check continuity of PA Defective low p primary winding of low voltage voltage transformer Approx transformer gt 5309 11300 normal gt Disconnect high voltage Fuse again gt Defective gt Replace fuse and operate the unit
4. D O M switch Check D C voltage m ov gt Defective touch gt gt Replace being supplied to control Circuit RELAY RY2 coil gt Approx Fault contacts Replace 12V DC of RELAY RY2 or open relay coil 23 TROUBLE 3 No microwave oscillation even though fan motor rotates CONDITION CHECK RESULT CAUSE REMEDY No gt Check continuity of gt No Defective gt Replace microwave high voltage fuse continuity high voltage oscillation fuse gt No microwave oscillation 17 Es Check continuity of gt Continuily gt Defective E O high voltage capacitor terminals high voltage with wires removed transformer Check continuity of TFT Continuity gt Defective high Replace gt high voltage rectifier in forward in backward voltage rectifier and backward direction direction with DC megger Connect megger leadsto gt Continuity Defective gt gt magnetron terminal and magnetron magnetron body Check D C voltage gt OV gt Defective Replace gt being supplied to touch control RELAY RY1 coil circuit Approx Faulty contacts of
5. GOBZJN MO d 018 Zis QMW aov qe m 5 M L 16 y UDy Aoy duo WI ET SI J C TEE IVA ve ZA bey uny 9 E IF ATO IE AKA LY IBA PA RS A A l NV3 ANO l SSINTIH 1 LP Dm 0 cid ZZ AL y EN ln M 1 001 SALE NV3 AVULd NWT I prim fenmi ferii aviv ena z OR nd o AOG ZAD 10 20 ea 0 sa e _ ax xol ri U RR Brom ei ONILIUM DA yds en a BP LONI ag 3 7 SOT hea TZ Ba oo peo ivan IVO NO DO f Tid Z i e ji LAY L Kf TP TIY dol 9 90d MALA er 918 gD BY LYN l f JQAZI vI 959 lid vz w E 1 EAN Gl GOd YORBLEODA ELA WBOLVUH BIV3HFANOO l w A 2 Yl 90d PRORA 7 ur ozy Lolo BYLIN Z K30 20 E 60 60 Y AAA Qld SZ MA e vAN Mog ye N 10d XBEL EOD 4 z MS Woa STOIYOLTBT8I OE EI H Pi Zr prta MA n OE 20 j bT 119 018 AL BH TAO t N 96EWA 91 oer a M dida Ted BZ am k O w lb bd 499Z LV 90 Bb LYNI sl ore SU 90 ZA ri ore vy or ra NW 6 Zrd 94d 3 oce CH Add lr Soc Na AW B Ird vid zh A ore E ee 128 nm CET ONVLFHOYBANL bal 43 PCB ASS Y PART LIST NO LOCATION PART CODE NAME SPECIFICATION Q TY 1 BZ1 3515600100 BUZZER BM 20K 1 2 CAI CN5XB 102M C ARRAY 6P 5 1000PF M 50V 1 3 C7 CCZF1H473Z C CERA 50V HIKF 0 047uF Z 1 4 C4 C6 CCZB1H102K C CERA 102K 50V AXIAL 2 5 C1 3 C5 C8 C9 CCZF1H104Z C CER
6. and holds the door when the door shuts If the door opens while the oven is operating the oven will stop operating immediately 2 DOOR SEAL Door seal prevents the microwave leakage from the oven cavity 3 DOOR VIEWING SCREEN Food inside of oven can be observed through the door viewing screen It is designed that the microwave cannot pass through the screen 4 TOP HEATER Top heater turns on if any of heater related mode operates 5 OVEN FRONT PLATE 6 CONVECTION INLET 7 OVEN LAMP Oven lamp turns on anytime the door opens and oven operates 8 SAFETY INTERLOCK SYSTEM 9 CONTROL PANEL 10 METAL RACK 11 COUPLER Coupler located at the center of the oven cavity and it couples between the motor and the glass tray 12 ROLLER GUIDE Roller guide must be used anytime with the glass tray 13 GLASS TRAY Glass tray is made of special heat resistant glass material It must be always properly fitted with the coupler and the roller guide 2 KOC 9Q4T Display Cooking time power level program indicators and present time are displayed MW m When blinking the oven is operating in MICROWAVE COOK mode Grill ra When blinking the oven is operating in GRILL mode Combi FN When blinking the oven is operating in COMBI mode Convection 1x1 When blinking the oven is 1 operating in CONVECTION mode Defrost xs When blinking the oven is operating in DEFROST mode Auto cook When blinking the oven
7. is 2 operating in AUTO COOK mode Warm amp When blinking the oven is operating in WARM mode Steam Cleaning 45 When blinking the 3 ovenis operating in STEAM CLEANING mode gram 5 When blinking the oven is operating in weight input mode Auto cook Used to cook or reheat aD Defrost Used to defrost foods 4 MW Used to set power level of the microwave Grill Used to select grill mode 6 Combi Used to select combi mode 43 7 Convection Used to select convection mode and selected temp Clock Used to set clock 9 STEAM CLEANING Used to clean the inside of the oven 0 Warm or Dish Warm Used to keep the food or dish warm Dial knob Used to set time weight and quantity I START SPEEDY COOK Used to start a program or a speedy start each press adds 30 seconds of microwave cooking time B STOP CLEAR Used to stop the oven Operation or to delete the cooking data 8 IROUBLESHOOTING GUIDE Following the procedure below to check if the oven is defective or not Check grounding before trouble checking Be carelul of the high voltage circuit Discharge the high voltage capacitor When checking the continuity of the switches fuse or high voltage transformer disconnect one load wire from these parts and check continuity with the AC plug removed To do otherwise may result in a false reading or damage to your meter PS wa 1 2 3
8. 1 O 0 nom WHHL 31 Refer to 6 Disassembly and assembly 2 CONTROL PANEL ASSEMBLY 1 DOOR ASSEMBLY Refer to 6 Disassembly and assembly 3 TOTAL ASSEMBLY KOC 9Q4T 2 SM WL l A KA ee i EM IT 7 eaa e DI SL AD LU ANA lt W O 960000 a 8 p o 35 v Caution In this Manual some parts can be changed for improving their performance without notice in the parts list So if you need the latest parts information please refer to PPL Parts Price List in Service Information Center http svc dwe co kr REF NO PART CODE PART NAME DESCRIPTION Q TY H01 3516119900 CAVITY AS KOC 9Q0T7S 1 H02 3511403800 COVER WAVE GUIDE MICA T0 35 1 H03 7113400810 SCREW TAPPING T1 BIN 4X8 STS430 MFZN 1 H04 3511414800 COVER LAMP PE0 1T 1 H05 3517413410 COUPLER TEFLON 1 H06 3966031800 MOTOR SYNCRO 49TYD 5C 1 H07 7122400611 SCREW TAPPING T2S TRS 4X6 MFZN 1 H08 3511801400 FAN CONVECTION AS KOC 9Q0T7S 1 H09 7113400810 SCREW TAPPING T1 BIN 4X8 STS430 MFZN 4 H10 3514801400 SENSOR TEMPERATURE PTM K312 D7 1 H11 75432X4081 SPECIAL SCREW TT3 TRS 4X8 SE MFZN 1 H12 3512783520 HARNESS MAIN KOC 9Q0T7S 1 H13 3513820520 LOCK PP 1 H14 3513702630 LEVER LOCK POM 1 H15 4415A17352 SW MICRO VP 533A OF SPNO 187 200G 1 H16 4415A66910 SW MICRO VP 531A OF SZM V16 FA 61 2 H17 3
9. 2 14 TZRC106M TR KRC 106M AUTO 5 35 Q6 TZTA1266Y TR KTA 1266Y AUTO 1015Y 1 36 Q8 10 13 TZTC3198GR TR KTC 3198GR AUTO 1015Y 3 37 LVT1 5EPV035308 TRANS POWER DMR 161FS 1 38 J4 5 8 10 15 21 24 85801052GY WIRE COPPER 1 0 52 TIN COATING 7 5mm 15 J29 31 33 34 39 J1 3 6 7 11 14 16 20 85801052GY WIRE COPPER 1 0 52 TIN COATING 10mm 19 J28 J32 35 37 40 M299 3514332520 PCB SUB BOARD 89x197 1 41 CN101 4CW215RBDO CONN WAFER HLEM15R 1 1 42 EN101 5S10302010 SW ROTARY RE012305PVB25FINB1 2 24PCE 1 43 SW101 SW111 5S50101Z93 SW TACT KPT 1115AM 11 44 J101 J102 85801052GY WIRE COPPER 1 0 52 TIN COATING 10mm 2 45 WF WSJ 159007 WIRE FLAT 1 25X15X90XC 1 44 S M NO OG DA WOO ELECTRONICS DAEWOO ELECTRONICS CORP 1 2 Jeo dong 1 il ga Jung gu Seoul Korea C P O BOX 8003 SEOUL KOREA TELEX DWELEC K28177 8 CABLE DAEWOOELEC PRINTED DATE Mar 2010
10. 518907020 THERMOSTAT OFF 120 ON 60 H 187 NB 1 H18 3513003410 HOLDER THERMOSTAT PP BK 1 H19 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 2 H20 3510317520 BASE SBHG T0 5 1 H21 3512101400 FOOT DASF 310 2 H22 3518303100 CAPACITOR HV 2100VAC 0 98UF 187 3 0 1 H23 3513003200 HOLDER HV CAPACITOR SECC T0 5 1 H24 3518400400 DIODE HV HVR 1X 3AB 12KV 187 1 H25 7S432X4081 SPECIAL SCREW TT3 TRS 4X8 SE MFZN 1 H26 3518702100 FUSE HV 5KV 0 7A T H V 060T 1 H27 3515201101 STOPPER HINGE U SCP 1 T2 5 1 H28 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 1 H29 3517304300 FOAM CR 15TX150X15 1 H30 75312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 6 H31 3513601600 LAMP BL 240V 25W T25 C7A H187 1 H32 4414H50000 FIXTURE AS KOG 36150S 2 H33 3518124400 TRANS HV R1S59E ES00 1 H34 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 4 H35 3516738700 CONTROL PANEL AS KOC 9Q4T7S 1 H36 7122401211 SCREW TAPPING T2S TRS 4X12 MFZN 1 H37 3511728330 DOOR AS KOC 9Q4T7S 1 H38 7272400811 SCREW TAPTITE TT3 TRS 4X8 MFZN 2 36 v Caution In this Manual some parts can be changed for improving their performance without notice in the parts list So if you need the latest parts information please refer to PPL Parts Price List in Service Information Center http svc dwe co kr REF NO PART CODE PART NAME DESCRIPTION Q TY H39 3512529400 GUIDE WIND AS KOC 9Q0T7S 1 H40 7122401211 SCREW TAPPING T2S TRS 4X12
11. A 50V HIKF 0 1uF Z 6 6 EC1 CEXE1H100A C ELECTRO 50V RSS 10MF 1 7 EC2 CEXF1E102V C ELECTRO 25V RSS 1000uF 1 8 JONI 3519150520 CONN WAFER YW396 02V 1 9 CN2 ACW215SBDO CONN FILM HLEM15S 1 1 10 CN3 30166M5030 CONN WAFER MOLEX 35312 0310 1 11 CN5 3519150540 CONN WAFER YW396 07AV 1 12 D1 D13 DZN4148 DIODE SWITCHING 1N4148 AUTO 52mm 13 13 D14 D15 DZN4004A DIODE RECTIFIER 1N4004A AUTO 52mm 2 14 IC1 13GL86FH47 IC MICOM TMP86FH47AUG TMP86CH47AUG 1 15 IC2 1K1A7033AP IC RESET KIA7033AP 1 16 VLI 1CPMC7805C IC REGULATOR MC7805C 1 17 DP1 DDDUA9QOT LED DISPLAY TOF 4422BMA B14 G 1 18 M298 3514332420 PCB MAIN BOARD 92 8x197 1 19 RA1 RA 87X104J R ARRAY 7P 6 1 8 100K J 1 20 RI R8 RD AZ331J R CARBON FILM 1 6 330 OHM 5 8 21 R12 18 25 26 33 RD AZ102J R CARBON FILM 1 6 1K OHM 5 5 22 R9 16 20 32 RD AZ472J R CARBON FILM 1 6 4 7K OHM 5 4 23 R11 19 R22 24 R27 29 RD AZ103J R CARBON FILM 1 6 10K OHM 5 8 24 R10 30 RD AZ473J R CARBON FILM 1 6 47K OHM 5 2 25 R17 RD AZ105J R CARBON FILM 1 6 1M OHM 5 1 26 R21 RD 4Z510J R CARBON FILM 1 4 51 OHM 5 SMALL 1 27 R31 RD 4Z101J R CARBON FILM 1 4 100 OHM 5 SMALL 1 28 R14 RN AZ1002F R METAL FILM 1 6 10K 1 1 29 R15 RN AZ1203F RMETAL FILM 1 6 120K 1 1 30 CRI SPAROOMTS RESONATOR CERA CRT4 00MS 1 31 RY1 3 5SC0101121 SW RELAY G5G 1A 1C 1P DC12V 2 32 RY2 4 5SC0101487 SW RELAY DY2 DC12 2 33 Q1 Q5 TZRA106M TR KRA 106M AUTO 5 34 Q7 9 11 1
12. AN MN R21 STATE POINT A POINT B RELAY 2 ON 5V DC GND RELAY 2 OFF GND 12V DG Check method 40 4 Case of no heating of top heater main When touching GRILL or COMBI or CONVECTION button oven lamp turns on and fan motor and turntable rotate and cook indicator in display comes on Cause RELAY 3 does not operate RY3 424 P11 GRILL m D7 STATE POINT A POINT B RELAY 3 ON 5V DC GND RELAY 3 OFF GND 12V DC 5 Case of no heating of top heater sub When touching GRILL or COMBI or CONVECTION button oven lamp turns on and Fan motor and turntable rotate and cook indicator in display comes on Cause RELAY 4 does not operate RY4 CONV HEATER l 25 P10 Ti o Dam STATE POINT A POINT B RELAY 4 ON 5V DC GND RELAY 4 OFF GND 12V DC 41 6 Case of no stopping of the count down timer When the door is opened during operation the count down timer does not stop vi A De l 1N4148 Q6 A1266V CN1 1 O MAN 28 P32 YW396 02V 2 v2 R9 4 7K R10 a 47K ie T D O M SW Check method POINT A B STATE DOOR OPEN OPEN 5V DG DOOR CLOSED CLOSE GND CHECK NO METHOD REMEDY 1 Check the stage ON OFF of the door open Replace door open monitor switch monitor switch by resistance measurement 42 13 P C B CIRCUIT DIAGRAM
13. ELAY RY3 coil gt Approx gt Faulty contacts of Replace 12V DC RELAY RY3 or open relay coil TROUBLE 5 1 Convection heater is not heated food will not become hot 2 Convection fan motor does no rotate CONDITION CHECK RESULT CAUSE REMEDY ann Malfunction of Adjust or 1 Sub heater y Check continuity of a No fo P is not primary interlock switch continuity primary Interlock replace heated switch 2 Convection fan and a Check continuity of I No gt Malfunction of gt Adjust or motor does DOM switch continuity DOM switch replace not rotate Check continuity of No Defective heater Replace gt heater or motor l continuitv or motor Check D C voltage gt oV IV Defective touch gt Replace gt being supplied to control circuit RELAY RY4 RY2 coil gt Approx gt gt Faulty contacts of gt Replace 12V DC RELAY RY4 RY2 or open relay coil 25 TROUBLE 6 The following visual conditions indicate a probable defective touch control Circuit or button P C B assembly Incomplete segments 1 segment missing 2 partial segments missing 3 digit flickering other than normal fluorescent slight flickering 2 A distinct change in the brightness of one or more numbers exists in the display One or more digits in the display are not on when they should be Display does not count down or up with time cooking or clock operation Oven is programmable and cooks normally but no display shows Displa
14. MFZN 1 H41 35113A5QJ5 CORD POWER AS 3X1 5 80X80 120 RTML 1 4M 1 H42 75312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 2 H43 3518003700 MAGNETRON 2M218JFL 6CF 1 H44 3516003700 SPECIAL SCREW TT3 HEX 4X8 FLG MFZN 3 H45 3512807530 HEATER T AS KOC 9Q0T7S 1 H46 3512525510 GUIDE AIR AS KOC 9Q0T7S 1 H47 7112401011 SCREW TAPPING T1 TRS 4 10 MFZN 2 H48 7113400810 SCREW TAPPING T1 BIN 4X8 STS430 MFZN 1 H49 3513304400 INSULATOR HEATER T SBHG T0 4 1 H50 3518903800 THERMOSTAT OFF 160 ON 115 V 187 1 H51 7121400611 SCREW TAPPING T2S PAN 4X6 MFZN 1 H52 75312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 2 H53 3510810800 CABINET AS KOC 9Q0T7S 1 H54 75312X40A1 SCREW SPECIAL T1 TRS 4X10 SE MFZN 5 H55 3517212000 TRAY RACK AS KOC 9Q0T7S 35MM 1 H56 3512512930 GUIDE ROLLER AS KOR 121Q3A XAREG 1 H57 441CD35011 TRAY GLASS DIA 325 1320G 1 37 12 PRINTED CIRCUIT BOARD CIRCUIT CHECK PROCEDURE 1 Low voltage transformer check The low voltage transformer is located on the P C B Measuring condition Input voltage 230V Frequency 50Hz een a eA De kn l NOTE 1 Secondary side voltage of the low voltage transformer changes in proportion to fluctuation of power source 1 9 8 7 3 voltage Ez A oro o uuu uu i i i i i 2 Voltage Check Terminal 7 8 9 Voltage load DC 13 5 V Voltage no load AC 37 V l 2 The allowable tolerance of the secondary voltage is within 5 of nominal voltage
15. Replace 12V DC RELAY RY1 or open relay coil Check resistance of primary PL 92 or oo gt Defective gt Replace and secondary coil of high high voltage voltage transformer transformer 1 Check continuity of filament gt No continuity gt Defective high gt Replace terminal of high voltage voltage transformer transformer 2 Check continuity of f No continuity gt Defective Replace magnetron heater with wires magnetron removed 24 TROUBLE 4 Grill heater upper heater is not heated food will not become hot CONDITION CHECK RESULT CAUSE REMEDY f Check continuity of No Malfunction of Adjust or Main heater gt primary interlock switch continuity gt primary Interlock gt replace is not heated switch gt Check continuity of gt No Malfunction of gt Adjust or DOM switch continuity DOM switch replace PP Check continuitv of No o A Defective heater gt Replace heater continuity Check D C voltage OV IV Defective touch Replace Se being supplied to control circuit R
16. S M No OC9Q3T 7S01 Service Manual Microwave Oven Model KOC 9Q4T V Caution In this Manual some parts can be changed for improving their performance without notice in the parts list So if you need the latest parts information please refer to PPL Parts Price List in Service Information Center http svc dwe co kr DA WOO gt G ELECTRONICS Mar 2010 2 SPECIFICATIONS MODEL KOC 9Q4T POWER SUPPLY 230V 50Hz SINGLE PHASE WITH EARTHING MICROWAVE 1400W POWER GRILL 1250W CONSUMPTION CONVECTION 1250W COMBINATION 2700W MICROWAVE ENERGY OUTPUT 900W IEC 705 MICROWAVE FREQUENCY 2450MHz OUTSIDE DIMENSIONS W X D X H 513X383X311mm 20 2X15 1X12 2 in CAVITY DIMENSIONS W X D X H 354X341X231mm 13 9X13 4X9 1 in NET WEIGHT Approx 16 6Kg 46 6 lbs TIMER 60 minutes FUNCTION SELECTIONS Microwave Grill Convection Combination POWER SELECTIONS 10 LEVELS CAVITY VOLUME 0 99 Cu Ft SPECIFICATION ARE SUBJ ECT TO CHANGE WITHOUT NOTICE 3 EXTERNAL VIEW 1 OUTER DIMENSION 2 KOC 9Q4T 2 FEATURE DIAGRAM E O O 0000000 O O O PF 43 a 1 DOOR HOOK Hook automatically locks
17. UT Microwave output power can be checked by indirectly measuring the temperature rise of a certain amount of water exposed to the microwave as directed below PROCEDURE 1 A oylindrical container of borosilicate glass is used for the test It has a maximum thickness of 3mm an external diameter of approximately 190mm and a height of approximately 90mm The mass of the container is determined 2 At the start of the test the oven and the empty container are at ambient temperature Water having an initial temperature of 10 C 1 C is used for the test The water temperature is measured immediately before it is poured into the container 3 A quantity of 1000g 5g of water is added to the container and its actual mass obtained The container is then immediately placed in the centre of the oven shelf which is in its lowest normal position The oven is operated and the time for the water temperature to attain 20 C 2 C is measured The oven is then switched off and the final water temperature is measured within 60s NOTE 1 The water stirred is before its temperature is measured NOTE 2 Stirring and measuring devices are to have a low heat capacity 4 The microwave power output is calculated from the formula P 4 187 mw T2 T1 0 55 mc T2 To t where P is the microwave power output in watts mw is the mass of the water in grams mc is the mass of the container in grams To is a
18. blows high voltage transformer 22 CONDITION CHECK RESULT CAUSE REMEDY Outlethas gt Check continuity of s No f Defective Replace proper magnetron continuity magnetron voltage fuse does not blow gt Check continuity of noise filter No Defective line Pena board continuity filter board p L gt Check continuity of No Open power A Replace power supply cord continuity supply cord No f Defective touch Replace continuity control circuit r I NOTE All these switches must be replaced at the same time please refer to 7 Interlock mechanism and I adjust for adjustment instructions TROUBLE 2 Display shows all figures selected but oven does not start cooking even though desired program and time are set and start button is tapped CONDITION CHECK RESULT CAUSE REMEDY Malfunction of i Turntable gt Check continuity of No A IR imo gt Adjust or motor and primary interlock switch continuily primary ee replace oven lamp switch do not turn on Check continuity of No Malfunction of Adjust or gt secondary interlock gt continuity secondary replace and D O M switch Interlock and
19. er and glass thermometer 100 C 212 F 2 Pour 275cc 15cc of tap water initially at 20 5 C 68 9 F in the 600 cc glass beaker with an inside diameter of approx 95 mm 3 5 in 3 Place it at the center of the tray and set it in a cavity 4 Close the door and operate the oven 5 Measure the leakage by using Microwave Energy Survey Meter with dual ranges set to 2450MHz 1 Measured radiation leakage must not exceed the value prescribed below Leakage for a fully assembled oven with door normally closed must be less than 4mW Cm2 2 When measuring the leakage always use the 5 cm 2 in space cone with probe Hold the probe perpendicular to the cabinet and door Place the space cone of the probe on the door cabinet door seem door viewing screen the exhaust air vents and the suction air vents 3 Measuring should be in a counter clockwise direction at a rate of 1 in sec If the leakage of the cabinet door seem is unknown move the probe more slowly 4 When measuring near a corner of the door keep the probe perpendicular to the areas making sure the probe end at the base of the cone does not get closer than 2 in from any metal If it does not erroneous reading may result 28 3 COMPONENT TEST PROCEDURE e High voltage is present at the high voltage terminal of the high voltage transformer during any cooking cycle e It is neither necessary nor advisable to attemp
20. mbient temperature in degrees Celsius Ti is the initial temperature of the water in degree Celsius T2 is the final temperature of the water in degrees Celsius t is the heating time in seconds excluding the magnetron filament heating up time The microwave power output is stated in watts rounded off to the nearest 50W ve CAUTION l I 1 Water load should be measured exactly to 1 liter l 2 Input power voltage should be exactiv specified voltage Refer to 2 SPECIFICATIONS l l 3 Ambient temperature should be 20 2 C 68 3 6 F l La a Heating time for power output T2 To A second 70 64 60 56 52 49 47 44 42 40 38 B W 600 650 700 750 800 850 900 950 1000 1050 1100 27 2 MICROWAVE RADIATION TEST Re Ee aR CRE at em PCI WARNING I I I I I unit under the test 1 Make sure to check the microwave leakage before and after repair of adjustment 2 Always start measuring of an unknown field to assure safety for operating personnel from microwave energy 3 Do not place your hands into any suspected microwave radiation field unless the safe density level is known 4 Care should be taken not to place the eyes in direct line with the source of microwave energy 5 Slowly approach the unit under test until the radiometer reads an appreciable microwave leakage from the TTT PROCEDURE 1 Prepare Microwave Energy Survey Meter 600cc glass beak
21. ontinuity checks can only indicate and open filament or a shorted magnetron To diagnose for an open filament or a shorted magnetron 1 Isolate magnetron from the circuit by disconnecting the leads 2 A continuity check across magnetron filament terminals should indicate 0 1 Qor less 3 A continuity check between each filament terminal and magnetron case should read open 5 Fuse If the fuse in the primary and monitor switch circuit is blown when the door is opened check the primary and monitor switch before replacing the blown fuse In case the fuse is blown by an improper switch operation replace the defective switch and fuse at the same time Replace just the fuse if the switches operate normally 29 10 WIRING DIAGRAM NOELINIWN 30010 NH UU NH ish tu HOLSINGSHL OQ YSNYOSSNYYL JILQA HOH HM ASSY 8 Md TOLNOD HOLIMS WO 0 li HOLIMS YOO THSINI ABYaNOISS AWD AO N3309 NO MOTISANS3H9 39 MN HOLIMS HOLINON YOOTWSIN 109 3M8 8 Aa Aa Hand LLE NI WWW H3LVAH dOL NMOWE 48 MOTZA IMA 08 8 JUHM HM 034 08 ae amp 3ly3H a ans YaLY3H dOL ens HOLOW FIEWLNENL NLL HOLOW NY NOLLOJANOO WO YOLON NJ NJ 440 00 ANY nano 70 039010 000 310N NOLLICNOO BINBOJSNYEL MI zu KOLON L E0103 HOLIMS YOO TWAIN Jou 3snj 88 ASS WBNS INN ANO y ISVHd F19NIS AlddfiS HIMOd
22. t measurement of the high voltage Before touching any oven components or wiring always unplug the oven from its power source and discharge the capacitor 1 High voltage transformer 1 Remove connections from the transformer terminals and check continuity 2 Normal readings should be as follows Secondary winding Approx 168 2 10 Filament winding Approx 0 Q Primary winding Approx 1 97 Q 2 High voltage capacitor 1 Check continuity of capacitor with meter on the highest OHM scale 2 A normal capacitor will show continuity for a short time and then indicate 10MW once the capacitor charged A shorted capacitor will show continuous continuity An open capacitor will show constant 10M Resistance between each terminal and chassis should be infinite ae re wa 3 4 5 3 High voltage diode 1 Isolate the diode from the circuit by disconnecting the leads 2 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 back resistance of the diode otherwise an infinite resistance may be read in both directions A normal diode s resistance will be infinite in one direction and several hundred kQin the other direction 4 Magnetron For complete magnetron diagnosis refer to Measurement of the Microwave Output Power C
23. y obviously jumps in time while counting down Display counts down noticeably too fast while cooking Display does not show the time of day when clear button is touched Oven lamp and turn table motor do not stop although cooking is finished Check if the RELAY RY2 contacts close and if they are close replace touch control circuit O ON DO OO CONDITION CHECK RESULT CAUSE REMEDY Display does Check each button for Normal gt Malfunction of Replace not show continuity of the button touch control control box programming circuit of control sub assembly at all even if box sub assembly keyboard is touched TROUBLE 7 When ERROR 2 ERROR 3 come on display CONDITION CHECK RESULT CAUSE REMEDY ERROR ce Check continuity of thermistor _ OQ or infinite __ Replace Replace ERROR 3 resistance of thermistor come on ispl ee Approx gt 200k 300kQ room temperature ur No Defective gt Repl ze Check continuity of heater continuity K ster eplace main sub gt gt y gt continuity Defective touch Replace control circuit 26 9 MEASUREMENT AND TEST 1 MEASUREMENT OF THE MICROWAVE POWER OUTP
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