MICROWAVE OVEN
Contents
1. QU p n x m 3 A 1 29 H V CAPACITOR TT i 1 4 1 oases BLU MONITOR FUSE 9 250V1 6A F FA a MAGNETRON nra ERE T POW ER RELAY SECONDARY INTERLOCK T MAIN POWER INRUSH GRILL DOOR SENSING Ys RELAY RELAY SW CONDITION OF OVEN 7 57 i DOOR IS OPENED 1 ie TUN COOK OFF EU 5 M P C B IN OUT POINT ASSY MAIN P CB WIRING COLOR BRN BROWN BLU BLUE Te WHT WHITE ORANGE z RED RED YEL YELLOW com j ELK NOj RG NO BLU BLK BLACK BLK BLK ORG BLK Y G YELLOW GREEN PRIM ARY LATCH DOOR SENSING MONITOR SWITCH SWITCH SWITCH MAGNETRON HIGH VOLTAGE DIODE HIGH VOLTAGE CAPACITOR O A H V FUSE SYMBOL COLOR BRN BROWN BLK BLACK RED RED BLU BLUE HIGH VOLTAGE TRANSFORM ER Samsung Electronics 9 12. Dee gs gm ea atte 1 i gE 7 gt 5V 1001 Lv 002 51 1 4 l o I pe 22 gt P40 18 Bee A Ot 1 21 046 i 33444 2 2K ROA co5 51 1 44 LED 10 1042 BAS LTC46386KC 06 E 2004 KA7533 AN j iXRESET 42 20 BEB SE 1 4 5 y 7 58 coy 7 co3 i PET x 4704 TZP 5 18 100uF M 15 GND ey ot N P43 21 MW E 22uF M 104 7 4 P50 22 E30 1 44 1 Q EUROPE TT Tarr TTT TTT THT R31 pph 51 1 4N eT ION T i d ctun damus e ctm CL e e cde E TE S 51 23 AN 00 e ge EDU IN if 5V m P52 24 if lt i 1 AINT 2 17 NR440271 M _ P32 12 7 n e 4 003 ROB 07 2204 L J22 ES gl gt AW f 1 3 16 9 La a 2 1 11 e e 5 cunore UDN6 4 OPTION 8 KSR1005 492 4 15 8 5 P30 10 2 1602 a 104 2 RUSSIAS y la ram P02 3 5 H V T 47x E Tr TT1 TT 22058 m LET RES EE MATE MERE S S P01 2 e 13 sere gies Nye BT CMM INDEFINITE pene gt
3. 11 7 12 a NS Yav u P sMy250 03 1 1 jj POWER Ww H 27 261 gt 8 Rio 3 9K i 10K R44 1 l KSR1005 m 10K H 25 P53 ANE TROB ii 005 1 y 209 ES 9 3 19 _ 7 qum i Oe oU 9 rr 004 N R14 cio gt 104 2 1 M Wy watt 04 21 9 T 7 i T AA 00957 010 47 Di2V Di3V T A Reo 777 10K 4448 iNA148M 1NA140M 1N4148M 1NA148M A AN Weed oes ED oS cot TTl d fete 008 n a T 26 P60 1NA148M MINE en 28 P52 DRINK POTATO PAST POWER 221 7 4 4 4 AUTO LI i POWER KG DEFROST 24 i A 4 4 4 4 D07 x MIN 40SEC 4 046 Dax TROB P23 9 8 42 d 4 X INAUSH 681005 KSR1005 CN04 8021 FCZ254 8SL 2220 E l Ae4aV __ 7 ______ 3 Samsung Electronics P C B Diagrams 8 2 P C B Parts List 2202 000780 2401 000247
4. MICROWAVE OVEN CE745GR SERVICE anaia 5 MICROWAVE OVEN 1 Precaution 2 Specifications 3 Operating Instructions 4 Disassembly and Reassembly 5 Alignment and Adjustments 6 Troubleshooting SAMSUNG 7 Exploded Views and Parts List 8 PCB Diagrams 9 Schematic Diagrams BWT PRECAUTIONS BE OBSERVED BEFORE AND DURING SERVICING 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 c Before turning on microwave power for any service test or inspection within the microwave generating 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 A Microwave leakage
5. Upper Hinge Screw Lower Hinge Screw Door C Door A Door E 0 BM NE E EN NM NE BE FL L L E E _ _ Samsung Electronics Disassembly and Reassembly 4 3 4 Removal of Key Door amp Spring Remove pin hinge from Door Detach spring from Door E and key door Door E N After replacement of the defective component parts of the door reassemble it and follow the instructions below for proper installation and adjustment so as to prevent an excessive microwave leakage When mounting the door to the oven be sure to adjust the door parallel to the bottom line of the oven face plate by moving the upper hinge and lower hinge in the direction necessary for Key Door Spring proper alignment 4 Adjust so that the door has no play between the inner door surface and oven front surface If the door assembly is not mounted properly microwave energy may leak from the space between the door and oven 5 Do the microwave leakage test 4 4 Replacement of Fuse 1 Disconnect the oven from the power source 2 Remove the 10A fuse in the Noise filter 3 When replacing the 10A fuse be sure to use an exact replacement part If new 10A fuse blows out again after replacement check the primary interlock switch door sensing switch and interlock monitor switch 4 When the above three switches operate prope
6. The high voltage capacitor remains charged about 30 seconds after disconnection Short the negative terminal of the high voltage capacitor to the oven chassis Use a screwdriver High voltage is maintained within specified limits by close tolerance safety related components and adjustments If the high voltage exceeds the specified limits check each of the special components Fig 1 1 Discharging the High Voltage Capacitor Samsung Electronics 2 Specifications 2 1 Table of Specifications M ODEL CE745GR TIM ER 99 M INUTES 90 SECONDS POW ER SOURCE 230V 50HZ AC POWER CONSUM PTION MICROWAVE 1 400W GRILL 1100W OUTPUT POWER FROM 85 TO 850W 10 LEVEL POW ER 705 TEST PROCEDURE OPERATING FREQUENCY 2 450M Hz M AGNETRON OM 75PH 31 COOLING M ETHOD COOLING FAN MOTOR OUTSIDE DIM ENSIONS 19 x 102 H x 143 0 NET WEIGHT 36 3 LBS SHIPPING W EIGHT 39 6 LBS 2 2 Comparison Chart M ODEL FEATURE CE745GR M ORE LESS o AUTO REHEAT o AUTO DEFROST TIM COOK POWER LEVEL INSTANT M EM ORY BOOST CHILD LOCK CLOCK o GRILL COM BI Samsung Electronics 2 1 3 Operating Instructions 3 1 Control Panel Auto Defrost Butten C BIC gt Kg g Button 02 Power Level Selection Button Hold Timer Button M emory Button gt Combi Instant Cook Button Auto Cook Butto
7. check diode and magnetron also Oven does not accept key input Program 1 Key input is not in Sequence 2 Open or loose connection of membrane key pad to Ass y PCB 3 Shorted or open membrane panel 4 Defective Ass y PCB Refer to operation procedure Replace PCB main Timer starts countdown but no microwave oscillation No heat while oven lamp and fan motor turn on 1 Off alignment of latch switches 2 Open or loose connection of high voltage circuit especially magnetron filament circuit NOTE Large contact resistance will bring lower magnetron filament voltage and cause magnetron to lower output and or intermittent oscillation 3 Defective high voltage components H V Transformer H V Capacitor H V Diode H V Fuse M agnetron 4 Open or loose wiring of power relay 5 Defective primary latch switch 6 Defective power relay or Ass y PCB Adjust door and latch switches Check high voltage component according to component test procedure and replace if it is defective Replace PCB main Samsung Electronics 6 1 Troubleshooting 6 1 Electrical Malfunction continued SYMPTOM CAUSE CORRECTIONS Oven lamp and fan motor turn on 1 Misadjustment or loose wiring of primary latch switch 2 Defective primary latch switch Adjust door and latch switches Oven can program but timer does not start 1 Open or loose wiring of secondary interlock switch 2 Off alignme
8. CONTROL PANEL ABS VH 080 W HT 1 C5 DE67 40002A WINDOW DISPLAY RESIN ACRYLIC T2 3 M 945 1 C 6 DE91 10377A ASSY P C B M AIN 230V50HZ NS V F D CE945G 11 A 7 5 Body Latch Parts List Ref No Parts No Description Specification Q ty Remarks Old Parts No B1 DE66 40001A LATCH BODY POM F20 02 40GR NTR 1 B 2 3405 000178 SWITCH M ICRO VP 533A OF PS T85 250V 15A 1 73579 203 207 B 3 3405 000175 SWITCH M ICRO VP 531A OF T85 250V 15A 20 1 73579 203 278 B 4 3405 000178 SWITCH M ICRO VP 533A OF PS T85 250V 15A 1 73579 203 207 85 DE66 90001A LEVER SWITCH P O M F20 02 2 6 NTR 2ND W 1 Samsung Electronics 7 3 Exploded Views and Parts List 7 6 Standard Parts List Parts No Description Specification Q ty Remarks Old Parts No DE60 10012A SCREW TAP TITE TH 3 M 4 L10 SWR10 ZPC2 NO FIL 10504 0002 00 DE60 10012A SCREW TAP TITETH 3 M 4 L10 SWR10 ZPC2 P CO E 10504 0002 00 DE60 10012A SCREW TAP TITETH 3 M 4 L10 SWR10 ZPC2 HI UPP 10504 0002 00 DE60 10122A SCREW TAP TH TAP TH 2 4X8 FE FN C CEIL 11128 240 085 DE60 10122A SCREW TAP TH TAP TH 2 4X8 FE FN DE60 10098A SCREW ASSY TAPTITE PH TC M 4X8 SW RCH18A 7 DE60 100821 SCREW A 25 4X12 FEFZY B HEAT 77128 240 085 M O DRI A0103 0010 OUT PN 77154 203 8201 DE60 100821 SCREW A 25 4X12 FEFZY B PLTE 77154 203 8201 DE60 10080A SCREW W ASHER M 5 12 25 M GT 77154 202 910 DE60 10080A SCREW W ASHER M 5 L12 25 HVT 77154 202 910 DE60 100
9. 100V 200mA 500mW 16 D5 20 0402 000559 DIODE RECTIFIER D4G 400V 1A T 1 3 D01 2 4 0501 000283 TR SM ALL SIGNAL KSA539 Y PNP 400mW 92 1 TRO1 0501 000388 TR SM ALL SIGNAL KSC815 Y NPN 400mW TO 92 1 TR03 2001 000003 R CARBON 3300hm 5 1 8W 1 8 3 2 2 R03 04 2001 000037 R CARBON S 3300hm 5 1 2W AA TP 2 4x6 4 1 R02 2001 000273 R CARBON 100Kohm 5 1 8W AA TP 1 8x3 2m 1 R12 2001 000290 R CARBON 10Kohm 596 1 8W AA TP 1 8x3 2mm 6 R9 10 14 15 16 43 2001 000429 R CARBON 1Kohm 5 1 8W AA TP 1 8x3 2mm 1 R05 08 17 19 2001 000613 R CARBON 3 9Kohm 5 1 8W AA TP 1 8x3 2m 1 R11132021222342 2001 000776 R CARBON 4700hm 5 1 2W AA TP 3 3x9mm 1 R01 2001 000786 R CARBON 47Kohm 596 1 8W AA TP 1 8x3 2mm 12 R30 41 2011 001043 R NETW ORK 47Kohm 5 1 8W A SIP 8P BK ARO1 PRP PP WP DP PP PP c 6 9 10 11 12 15 C04 C02 C05 RYOI RY04 RY02 03 CN02 CNOL CN03 ARO2 C7 8 16 19 TR2 4 8 TRO9 20123 CN04 X TAL VED I2 LVTI BUZI 01 26 E1 8 8 2 Samsung Electronics 9 Schematic Diagrams 9 1 Schematic Diagrams MGT AEST RORE REB a PRIM ARYS W 5 BLK e dd TIT THT BRN o gt BLK POWER HV DIODE CORD 230V 50HZ H V FUSE 0 75A CE745G 0 8 9456 1 1 1 230V40W 1 1 1 1
10. 2401 000353 2401 000914 2401 001412 3501 001014 3501 001015 3501 001016 3708 000528 3711 000203 3711 000881 A1018 0067 A1100 1049 A4060 0008 A4060 0009 A4106 0154 A6010 0461 B1283 0030 DE07 10081A DE09 30479A DE13 20009A DE26 20141A DE30 20016A DE39 60001A DE60 60012A DE61 90004A C CERAM IC M LC AXIAL UP050F104Z 100NF 80 C AL 15A1ANB107M AN 100UF 20 10V GP 6 3X C AL 1SA1HW B101M 100UF 20 50V GP 10X16X C AL CESSL1C220M 0511AA 22UF 20 16V GP 5 C AL 1SGIVFB477M AN 470UF 20 35V GP 10X1 RELAY POW ER OM 1 5 1241 24V 21 8M A 17A RELAY POW ER OZF S 124LM 1P 24V 21 8MA 16A RELAY M INIATURE V24 KT 24V 12 5M A 5A CONN ECTOR FPC FC PIC FCZ254 13S L BLK 13 CONNECTOR HEADER YW 396 03AV WHT STRAIGHT CONNECTOR HEADER SM W 250 03 W HT BOX 3P 1R R NETW ORK RN 1 8 X 6P 473 T MHR5A473J C CERAM IC CC OA CH 50V T 220 3 5X1 9 U TR W RESISTOR KSR1005 300M W 100M A 50V TR W RESISTOR KSR2005 300M W 100M A 50V DIODE ZEN ER TZP5 1B 5 1 5 7V 40M A T 1W CONNECTOR W AFER YW 396 04V W HT RESONATOR CERAM 4 19 HZ 4 19M STAR 2 CN V F DISPLAY SVM 4SM 03 GRN RSHORG 4 51 81 IC M CU KS56C671 43 DIP CE945G CE745G 7533 DIP TRANS L V SLV 945E 230V 50HZ AC17 2 9V BUZZER CBE2220BA STICK WIRE SO COPPER PIO 6 SN T 52M M EYELET ID2 1 002 5 L3 0 SN BSP T0 25 HOLDER DIGITRON N YLON 66 1 5 85 36 8GR B Parts No Description Specification Q ty Remarks 0401 001002 DIODE SW ITCHING 1N 4148M
11. V SAMSUNG SERVICE LTD MARSHAL ZHUKOU 1 OFFICE 201 123308 MOSCOW RUSSIA Service technicians should remove their watches while repairing an MWO To avoid any possible radiation hazard replace parts in accordance with the wiring diagram Also use only the exact replacements for the following parts Primary and secondary interlock switches interlock monitor switch Samsung Electronics 11 12 13 14 15 If the fuse is blown by the Interlock Monitor Switch Replace all of the following at the same time Primary and secondary switches as well as the Interlock Monitor Switch The correct adjustment of these switches is described elsewhere in this manual Make sure that the fuse has the correct rating for the particular model being repaired Design Alteration Warning Use exact replacement parts only i e only those that are specified in the drawings and parts lists of this manual This is especially important for the Interlock switches described above Never alter or add to the mechanical or electrical design of the MWO Any design changes or additions will void the manufacturer s warranty 10 Always unplug the unit s AC power cord from the AC power source before attempting to remove or reinstall any component or assembly Never defeat any of the B voltage interlocks Do not apply AC power to the unit or any of its assemblies unless all solid state heat sinks are correctly installed Some semiconduc
12. check to verify compliance with the Federal performance standard should be performed on each oven prior to release to the owner Samsung Electronics 1 Precaution Follow these special safety precautions Although the microwave oven is completely safe during ordinary use repair work can be extremely hazardous due to possible exposure to microwave radiation as well as potentially lethal high voltages and currents 1 1 Safety precautions A r9 p B pi m 99 repairs should be done in accordance with the procedures described in this manual This product complies with Federal Performance Standard 21 CFR Subchapter J DHHS Pacemaker wearers must consult a physician before attempting to service an MWO Notify the Central Service Center if the microwave leakage exceeds 5 mw cm Check all grounds Do not power the MWO from a 2 prong AC cord Be sure that all of the built in protective devices are replaced Restore any missing protective shields When reinstalling the chassis and its assemblies be sure to restore all protective devices including nonmetallic control knobs and compartment covers Make sure that there are no cabinet openings through which people particularly children might insert objects and contact dangerous voltages Examples Lamp hole ventilation slots In the event of suspected microwave energy leakage in excess of 5 51 please notify J
13. 031A FAN M OTOR SM F745EA 230V 50HZ ASSY FAN MO 1 M 16 DE47 20009A THERM OSTAT CS 7SA 160 60 187Y 250V7 5A 1 1 M 17 DE03 30035A M AGNETRON OM 75PH 31 ESS 1 11059 0034 00 M18 4713 001004 LAMP INCANDESCENT 230V 40W ORG 25x 1 M19 DE71 60010A COVER AIR PP TB53 T1 7 WHT 64G M745 1 M 20 DE61 50129A BRACKET M OUNTING SECC 8 W 24 L316 M 624 1 73013 0342 00 M 21 DE93 20001A ASSY BODY LATCH 2ND W 1 97G45 M 9745 1 M 22 DE66 90013A LEVER DOOR POM 20 01 NTR M W5630T 1 71533 0015 00 M 23 DE91 70061B ASSY H V FUSE THV060T 0750 H 5KV0 75A RE 1 79163 0252 01 M 24 DE61 50106A BRACKET HVC SECC T0 8 W 31 L125 8 1 73013 0194 00 M 25 DE91 70065A ASSY HVD BM P28 SEM A 12KV SUM 1 79169 0153 00 M 26 2501 001014 C OIL HCH212105C 1 05UF 2100V 35 54 85 2 1 27 DE26 10099A TRANS H V SHV 745EG1 230V 50HZ 2200V DPC 1 M 28 DE61 40017A FOOT PP A353 BLK M W5630T 2 73004 0007 00 M 29 DE80 10003A BASE PLATE SGCC1 Z T0 8 W 340 L550 M 745 1 M 30 DE31 10154A MOTOR DRIVE M 2H 49ZR02 ST 16 21V 5 6 1 M 31 DE47 20008A THERM 05 5 75 100 60 187 250V7 5A 10 1 M 32 DE71 60013A COVER CEILING MICA T0 5 1 52 L118 CE745G 1 M 33 DE61 80004A HINGE LOWER SCP1 T2 3 ZN COATING BLK 1 M 34 DE61 80005A HINGE UPPER SCP1 T2 3 BLK ZN COATING 1 M 35 DE47 20174A THERM OSTAT NT 101NA 8 120 110 23 8M M 1 M 36 DE65 20014A CABLE CLAM P DA 6N NY 66 1 76449 0003 00 M 37 ASSY DOOR PUSH WHT CE745GR
14. 1 38 ASSY CONTROL BOX 230V 50HZ CE745GR CIS 1 ea M 39 DE74 20102B TRAY COOKING GLASS 15 0 1288 7806 745 1 M 40 DE92 90436A ASSY GUIDE ROLLER M W 4370W 1 M 41 DE67 60002A COUPLER PPS 5GR BRN 97645 1 M 42 DE74 70071A RACK W IRE M SW PI230 HI80 SNC2 1 M 43 DE39 40409A ASSY WIRE HARNESS E 230V50HZ M 9645 CTW 1 79204 0381 00 M 44 DE39 40568A ASSY WIRE HARNESS A 230V50HZ CE745G CE94 1 Option Parts 7 2 A Warning A Electrostatically Sensitive Devices Samsung Electronics Exploded Views and Parts List 7 3 Door Parts List Ref No Parts Description Specification Q ty Remarks Old Parts No 1 DE64 40007A DOOR A ABS VH 080 T3 0 W HT 1 D2 DE64 40006A DOOR KEY POM TC3005 12 0 12GR BLK CE9 1160 D 3 DE61 70033A SPRING KEY ES HSWR10 P10 6 06 0 122 3 BL 1 72724 0040 00 D4 DE67 20004D SCREEN DOOR PC T1 5 W173 6 L373 5 WHT CE 1 A D5 DE92 50126B ASSY DOOR E COATING BLK 7456 1 D 6 DE64 40008B DOOR C PP T1 5 W LG BLK CE745G 1 D7 01 00003 FILM DOOR PC T0 2 W 143 L265 CE745G 1 7 4 Control Parts List Ref No Parts No Description Specification Q ty Remarks Old Parts No C1 DE66 20006A BUTTON PUSH RESIN ABS HR 0370U P WHT M 9 l e C2 DE61 70076A SPRING BUTTON HSWR 0 6 1 76674 239 310 DE34 10007C SWITCH M EM 230V50HZ W 89 7 1161 1 A C4 DE72 70003A
15. 69A SCREW TAP TH TH L10 FRFZY DE02 00029A TAPE SCOTCHPAR POLY ESTER 3M 893 W 50 DE60 10069A SCREW TAP TH TH 110 FRFZY DE60 10012A SCREW TAP 3 110 SWR10 2 2 DE60 10098A SCREW ASSY TAPTITE PH TC M 4X8 SW RCH18A Z DE60 10098A SCREW ASSY TAPTITE PH TC M 4X8 SW RCH18A Z DE60 10082 SCREW TAPPING TH 25 4 8 MSWR3 ZPC YELWS DE60 100821 SCREW A 25 4X12 FEFZY DE60 100821 SCREW 25 4 12 FEFZY DE60 10012A SCREW TAP 3 110 SWR10 2 2 DE60 10098A SCREW ASSY TAPTITE PH TC M 4X8 SW RCH18A Z DE60 10052A SCREW TAP PH PH M 4 L8 FEFZY DE60 10018A SCREW ASSY M ACHINE PH M 4X0 7P 8 M SWR10S DE60 10013A SCREW ASSY 25 4112 M SW R3 ZPC3 FI CV AIR 77128 540 101 TR CUS 70859 800 311 B UPP 77128 540 101 HI LOW 70504 0002 00 M EM PN A0103 0010 CV TCO A0103 0010 B HVC 77154 203 8401 BD LAT 77154 203 8201 CON PA 77154 203 8201 C GE M 70504 0002 00 M GT TC A0103 0010 GR TCO 77108 540 081 B EATH 70504 0019 00 CV BLW 70504 0004 00 N L3 NY wore fF AA HPN NY L3 7 4 Samsung Electronics 8 P C B Diagrams 8 1
16. KODEL CE745GR Secondary 10320 10 Filament Shows Continuity Primary 1 610 10 Primary Room temperature 20 C Terminals j 5 2 Low Voltage Transformer 1 The low voltage transformer is located on the Terminals Resistance control circuit board 2 Remove the low voltage transformer from the 1 2 Input 11490 PCB Ass y and check continuity 3 Normal resistor reading is shown in the table 4 5 Outputl IV 12 260 7 8 Output2 9V 2 5740 5 3 Magnetron 1 Continuity checks can indicate only an open agnetron Antenna filament or a shorted magnetron To diagnose an open filament or shorted magnetron 2 Isolate the magnetron from the circuit by disconnecting its leads 3 A continuity check across the magnetron filament terminals should indicate one ohm or less 4 A continuity check between each filament terminal and magnetron case should read open Gasket Plate Cooling Fins Samsung Electronics 5 1 Alignment and Adjustments 5 4 High Voltage Capacitor 1 Check continuity of the capacitor with the meter set at the highest resistance scale 2 Once the capacitor is charged a normal capacitor shows continuity for a short time and then indicates 9MQ 3 A shorted capacitor will show continuous continuity 4 An open capacitor will show constant 9MQ 5 Resistance between each terminal and chassis should read infinite 5 5 High Voltage Diode 1 Isolate the diode from the circuit by dis
17. RECAUTION 1 CHECK GROUNDING BEFORE CHECKING FOR TROUBLE 2 BE CAREFUL OF THE HIGH VOLTAGE CIRCUIT 3 DISCHARGE THE HIGH VOLTAGE CAPACITOR 4 WHEN CHECKING THE CONTINUITY OF THE SWITCHES OR TRANSFORMER DISCONNECT ONE LEAD WIRE FROM THESE PARTS AND THEN CHECK CONTINUITY WITHOUT THE POWER SOURCE ON TO DO OTHERWISE M AY RESULT IN A FALSE READING OR DAM AGE TO YOUR M ETER 5 DO NOT TOUCH ANY PART OF THE CIRCUIT OR THE CONTROL CIRCUIT BOARD SINCE STATIC DISCHARGE M AY DAM AGE IT ALWAYS TOUCH GROUND WHILE WORKING ON IT TO DISCHARGE ANY STATIC CHARGE BUILT UP 6 1 Electrical Malfunction SYMPTOM CAUSE CORRECTIONS Oven is dead 1 Open or loose lead wire harness Check fan motor when thermal cutout is defective Fuse is 2 Open thermal cutout M agnetron No display and no operation at all 3 Open low voltage transformer 4 Defective Ass y PCB Check Ass y PCB when LVT is defective No display and no operation at all Fuse is blown 1 Shorted lead wire harness 2 Defective primary latch switch NOTE 1 3 Defective monitor switch NOTE1 4 Shorted HVCapacitor 5 Shorted HVTransformer NOTE2 Check adjustment of primary interlock monitor door sensing switch NOTE 1 All of these switches must be rep refer to adjustment instructions Check continuity of power relay contacts and if it has continuity replace power relay also NOTE 2 When HVTransformer is replaced aced at the same time
18. a radiarion preventing device make a repair record for the measured values and keep the data 2 If the radiation leakage is more than 5 mW St after determining that all parts are in good condition functioning properly and the identical parts are replaced as listed in this manual notift that fact to J V SAMSUNG SERVICE LTD MARSHAL ZHUKOU 1 OFFICE 201 123308 MOSCOW RUSSIA 5 9 2 At least once a year have the microwave energy survey meter checked for accuracy by its manufacturer Samsung Electronics 5 3 Alignment and Adjustments 5 10 Microw ave Heat Distribution Heat Evenness The microwave heat distribution can be checked indirectly by measuring the water temperature rise at certain positions in the oven 1 Prepare five beakers made of Pyrex having 100 milliliters capacity each 2 Measure exactly 100milliliters off water load with a measuring cylinder and pour into each beaker 3 Measure the temperature of each water load Readings shall be taken to the first place of decimals 4 Put each beaker in place on the cooking tray as illustrated in figure below Start heating 5 After heating for 2 minutes measure the water temperature in each beaker 6 Microwave heat distribution rate can be calculated as follows Minimum Temperature Rise Heat Distribution X 100 Maximum Temperature Rise The result should exceed 65 Cooking Tray 5 4 Samsung Electronics 6 Troubleshooting P
19. ary Interlock Switch Primary switch and Monitor switch to the latch body is necessary N When mounting the Latch to the oven assembly adjust the Latch Body by moving it so Interlock M onitor that the oven door will not have any play in it Switch Check for play in the door by pulling the door assembly Make sure that the latch keys move smoothly after adjustment is completed Lever Door Completely tighten the screws holding the Latch Body Latch Body to the oven assembly d oe 4 Reconnect to Monitor switch and check the continuity of the monitor circuit and all latch switches again by following the components test Door Open Door Closed prosedures Primary switch oo 0 5 Confirm that the gap between the switch M onitor switch COM NC 0 ia housing and the switch actuator is no more than Door Sensing S W 0 0 5mm when door is closed 5 2 Samsung Electronics Alignment and Adjustments 5 8 Output Power of Magnetron CAUTION MICROWAVE RADIATION PERSONNEL SHOULD NOT ALLOW EXPOSURE TO MICROWAVE RADIATION FROM MICROWAVE GENERATOR OR OTHER PARTS CONDUCTING M ICROW AVE ENERGY The output power of the magnetron can be measured by performing a water temperature rise test Equipment needed Two 1 liter cylindrical borosilicate glass vessel Outside diameter 190 mm One glass thermometer with mercury column NOTE Check line voltage under l
20. connecting its leads 2 With the ohm meter set at the highest resistance scale measure across the diode terminals Reverse the meter leads and read the resistance A meter with 6V 9V or higher voltage batteries should be used to check the front to back resistance of the diode otherwise an infinite resistance may be read in both directions The resistance of a normal diode will be infinite in one direction and several hundred KQ in the other direction 5 6 Main Relay and Power Control Relay 1 The relays are located on the PCB Ass y Isolate them from the main circuit by disconnecting the leads 2 Operate the microwave oven with a water load in the oven Set the power level set to high 3 Check continuity between terminals of the relays after the start pad is pressed 5 7 Adjustment of Primary Switch Door Sensing Switch and Monitor Switch Precaution For continued protection against radiation hazard replace parts in accordance with the wiring diagram and be sure to use the correct part number for the following switches Primary and door sensing switches and the interlock monitor switch replace all together Then follow the adjustment procedures below After repair and adjustment be sure to check the continuity of all interlock switches and the interlock monitor switch When mounting Primary switch and Interlock 7e Monitor switch to Latch Body consult the figure No specific adjustment during installation of Prim
21. cuit board Lift up the control circuit board from the Ass y control box 4 When reconnecting the FPC connector make sure that the holes on the connector are properly engaged with the hooks on the Plastic Fastener 4 6 3 Removal of Window Display amp Membrane Panel Window display should not be disassembled as its mounting tabs will be broken If repair work is difficult replace with Ass y control panel N The membrane key board is attached to the escutcheon base with doublefaced adhesive tape Therefore applying hot air such as using of hair dryer is recommended for smoother removal When installing new membrane key board make sure that the surface of escutcheon base is cleaned sufficiently so that any problems shorted contacts or uneven surface can be avoided Window Display M embrane Panel Samsung Electronics 5 Alignment and Adjustments PRECAUTION 1 High voltage is present at the high voltage terminals during any cook cycle 2 It is neither necessary nor advisable to attempt measurement of the high voltage 3 Before touching any oven components or wiring always unplug the oven from its power source and discharge the high voltage capacitor 5 1 High Voltage Transformer 1 Remove connectors from the transformer terminals and check continuity 2 Normal resistance readings are as follows Filament Terminals
22. food with aluminum foil Use plastic wrap or cover with a lid Stir once or twice while cooking foods such as soup cocoa or milk Noise from the turntable motor when it starts to operate Noise may result from the motor Replace turntable motor Samsung Electronics 7 Exploded Views and Parts List 7 1 Exploded Views Samsung Electronics 7 1 Exploded Views and Parts List 7 2 Main Parts List Ref No Parts Description S pecification Q ty Remarks OLD PARTS NO M1 DE70 30032X PANEL OUTER T0 6 W 351 2 L1010 W HT COATIN 1 M 2 DE63 90150A CUSHION RUBBER DFA 20 2 W 100 L140 BLK 1 M 3 DE61 50323A BRACKET UPPER ALSTAR 10 6 W 385 L205 M 624 1 73011 0243 00 M 4 DE61 30008A SUPPORTER HEATER ALUM INA T12 CE745G 1 M5 DE61 70060A SPRING PLATE SK 5 10 5 1 76674 232 810 M 6 DE47 70072A HEATER GRILL 230V 1100W 47 0HM 6 25 1 M 7 DE60 40009B WASHER TEFLON SLOT ID22 2 0028 T1 2 TEFL 1 10534 0004 02 M 8 DE63 20017A GASKET HEATER BRASS 11 5 0030 5 ID22 5 1 73404 0014 00 M 9 DE61 50021A BRACKET FLANGE SECC1 0 8 32 32 1 10 DE61 50027A BRACKET HEATER BSS2 A T 1 0 W 51 L 55 1 M 11 DE61 50025A BRACKET EARTH BSS2 A T1 0 CE745G 1 12 DE39 20058C ASSY POWER CORD KKP 4819D B232 250V16A L 1 M 13 DE71 60298A COVER BACK SECC T0 6 W 273 L633 6045 1 73312 0184 001 14 DE91 40095A ASSY NOISE FILTER SN E10D N 250V 10A 2 1 M 15 DE31 30
23. ing the magnetron be sure to remount the magnetron gasket in the correct position and make sure the gasket is in good condition Fan M otor H V Trans 4 2 Replacement of High Voltage Transformer 1 Discharge the high voltage capacitor 2 Disconnect all the leads 3 Remove the mounting bolts 4 Reconnect the leads correctly and firmly PRECAUTION Servicemen should remov their watches whenever working close to or replacing the magnetron PRECAUTION There exists HIGH VOLTAGE ELECTRICITY with high current capabilities in the circuits of the HIGH VOLTAGE TRANSFORM ER secondary and filament terminals It is extremely dangerous to work on or near these circuits with the oven energized Bolts DO NOT measure the voltage in the high voltage circuit including filament voltage of magnetron H V Trans Samsung Electronics 4 1 Disassembly and Reassembly 4 3 Replacement of Door Assembly 4 3 1 Removal of Door Assembly Remove screws securing the upper hinge and lower hinge Then remove the door assembly 4 3 2 Removal of Door C Insert flat screwdriver into the gap between Door A and Door C to remove Door C Be careful when handling Door C because it is fragile 4 3 3 Removal of Door E Following the procedure as shown in the figure insert and bend a thin metal plate between Door E and Door A until you hear the tick sound 1 Insertion depth of the thin metal plate should be 0 5mm or less
24. n M ore Less Button S COD Clock Setting Button Grill Button Button Timer Setting Button Stop Button 6 I N Start Boost Button CE745GR 3 2 Features amp External Views Door Ventilation Slot Light Door Latches DWD gt OOO DOOD OOGO ass Plate G Guide Roller GRILL W IRE RACK Safety Interlock Holes Control Panel Open Door Push Button 200mm Samsung Electronics 365mm 4 Disassembly Reassembly 4 1 Replacement of M otor Assembly and Lamp Remove the magnetron including the shield case permanent magnet choke coils and 500pF capacitors all of which are contained in one assembly Cover Air Thermo S W 1 Disconnect all lead wires from the magnetron and lamp 2 Remove the bracket mounting 3 Remove the air cover 4 Remove screws securing the magnetron to the wave guide 5 Take out the magnetron very carefully 6 Remove screws from the back panel 7 Remove the assy noise filter 8 Take out the fan motor 9 Remove the oven lamp by pulling out from hole of air cover carefully 10 NOTE1 When removing the magnetron make Magnetron sure that its antenna does not hit any Capacitor adjacent parts or it may be damaged 11 NOTE2 When replac
25. nt of primary interlock 3 Defective secondary interlock S W Adjust door and interlock switches Microwave output is low Oven takes longer time to cook food 1 Decrease in power source voltage 2 Open or loose wiring of magnetron filament circuit Intermittent oscillation 3 Aging of magnetron Consult electrician Fan motor turns on when plugged in Loose wiring of door sensing switch Check wire of door sensing switch Oven does not operate and return to the plugged in mode Defective Ass y PCB Replace PCB main Loud buzzing noise can be heard 1 Loose fan and fan motor 2 Loose screws on Transformer 3 Shorted H V Diode Tighten screws of fan motor Tighten screws of H V Transformer Replace H V Diode Turntable motor does not rotate 1 Open or loose wiring of turntable motor 2 Defective turntable motor Check the wire of turntable motor Replace turntable motor Oven stops operation during cooking 1 Open or loose wiring of primary interlock switch 2 Operation of thermal cutout M agnetron Adjust door and latch switches Sparks 1 M etallic ware or cooking dishes touching on the oven wall 2 Ceramic ware trimmed with gold or Silver powder also causes sparks Inform the customer Do not use any type of cookware with metallic trimming Uneven cooking Uneven intensity of microwave due to its characteristics W rap thinner parts of the
26. oad Low voltage will lower the magnetron output Make all temperature and time tests with accurate equipment 1 Fill the one liter glass vessel with water 2 Stir water in glass vessel with thermometer and record glass vessel s temperature T1 10 1 3 After moving the water into another glass vessel place it in the center of the cooking tray Set the oven to high power and operate for 51seconds exactly 2 seconds included as a holding time of magnetron oscillation 4 When heating is finished stir the water again with the thermometer and measure the temperature T2 5 Subtract T1 from T2 This will give you the water temperature rise AT 6 The output power is obtained by the following formula 4 187 x 1000 x AT 0 88xMcx T2 To 49 25 Heating Time sec 49 25 4 187 Coefficient for Water i 1000 Water cc AT Temperature Rise T2 T1 Mc Cylindrical borosilicate glass weight To Room temperature Output Power 7 Normal temperature rise for this model is 9 C to 11 C at HIGH NOTE 1 Variations or errors in the test procedure will cause a variance in the temperature rise Additional power test should be made if temperature rise is marginal NOTE 2 Output power in watts is computed by multiplying the temperature rise step 5 by a factor of 85 times the of centigrade temperature 5 9 Leakage Measuring Procedure 5 9 1 Record keeping and notification after measurement 1 After adjustment and repair of
27. rly check if any other part such as the control circuit board blower motor or high voltage transformer is defective 4 5 Replacement of Drive Motor 1 Take out the glass tray guide roller and coupler from cavity Drive otor Turn the oven upside down to replace the drive motor Remove a screw securing the drive motor cover Disconnect all the lead wires from the drive motor AeA N Remove screws securing the drive motor to the cavity Remove the drive motor 7 When replacing the drive motor be sure to remount it in the correct position Drive M otor Cover Base Plate Connect all the leads to the drive motor Screw the deive motor cover to the base plate with a screw driver 10 Remount the coupler in the correct position Samsung Electronics 4 3 Disassembly and Reassembly 4 6 Replacement of Control Circuit Board 4 6 1 Removal of Control Box Assembly 1 Be sure to ground any static electric charge in your body and never touch the control circuit 2 Disconnect the connectors from the control circuit board 3 Remove screws securing the control box assembly 4 Remove the screw securing the ground tail of the keyboard Control Box 4 6 2 Removal of P C B Assembly 1 Pull the lever end of the plastic fastener and remove the Flexible Printed Circuit FPC of membrane panel N Remove screws securing the control cir
28. tor solid state devices are easily damaged by static electricity Such components are called Electrostatically Sensitive Devices ESDs Examples include integrated circuits and field effect transistors Immediately before handling any semiconductor components or assemblies drain the electrostatic charge from your body by touching a known earth ground Always connect a test instrument s ground lead to the instrument chassis ground before connecting the positive lead always remove the instrument s ground lead last 1 1 Pretaution 1 2 Special Servicing Precautions Continued 16 When checking the continuity of the witches 17 18 or transformer always make sure that the power is OFF and one of the lead wires is disconnected Components that are critical for safety are indicated in the circuit diagram by shading or A Use replacement components that have the same ratings especially for flame resistance and dielectric strength specifications A replacement part that does not have the same safety characteristics as the original might create shock fire or other hazards 1 3 Special High Voltage Precautions High Voltage Warning Do not attempt to measureany of the high voltages this includes the filament voltage of the magnetron High voltage is present during any cook cycle Before touching any components or wiring always unplug the oven and discharge the high voltage capacitor See Figure 1 1
Download Pdf Manuals
Related Search