Calex CME28GT Service Manual

Summary of CME28GT

  • Page 1

    Microwave oven cme28gt service manual microwave oven contents 1. Precaution 2. Specifications 3. Operating instructions 4. Disassembly and reassembly 5. Alignment and adjustments 6. Troubleshooting 7. Exploded views and parts list 8. Pcb diagrams 9. Schematic diagrams calex.

  • Page 2: 1. Precaution

    1. Precaution 1-1 safety precautions ( ) 1-1 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. ...

  • Page 3

    17. When checking the continuity of the switches or transformer, always make sure that the power is off, and one of the lead wires is disconnected. 18. Components that are critical for safety are indicated in the circuit diagram by shading, or . 19. Use replacement components that have the same rati...

  • Page 4: 2. Specifications

    2. Specifications 2-1 table of specifications 2-1 model cme28gt item timer 99 minutes 90 seconds power source 230v/50hz, ac power consumption microwave : 1,500w,grill : 1,300w output power from100 to900w (6 level power) (iec-705 test procedure) operating frequency 2,450mhz magnetron om75p(31) coolin...

  • Page 5: 3. Operating Instructions

    3-1 clock setting time setting stop/cancel button microwave mode selection grill mode selection dual cook selection combi mode selection standing time setting instantreheat/ cook selection auto defrost selection weight selection start button 3. Operating instructions 3-1 control panel 3-2 features &...

  • Page 6

    4. Disassembly and reassembly 4-1 replacement of magnetron, motor assembly and lamp 4-1 remove the magnetron including the shield case, permanent magnet, choke coils and capacitors (all of which are contained in one assembly). 1. Disconnect all lead wires from the magnetron and lamp. 2. Remove the b...

  • Page 7

    4-3 replacement of door assembly 4-2 disassembly and reassembly 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. Then remove the door assembly. Following the procedure as shown in the figure, insert and be...

  • Page 8

    4-3 1. Disconnect the oven from the power source. 2. When 15a fuse blows out by the operation of interlock monitor switch failure, replace the primary interlock switch, door sensing switch, monitor switch and power relay. 3. When the above three switches operate properly, check if any other part suc...

  • Page 9

    4-6 replacement of control circuit board 4-6-1 removal of control box assembly 4-4 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. Rem...

  • Page 10: 5. Alignment and Adjustments

    5. Alignment and adjustments 5-1 high voltage transformer 5-2 low voltage transformer 5-3 magnetron 5-1 1. Remove connectors from the transformer terminals and check continuity. 2. Normal resistance readings are as follows: (room temperature = 20˚c) 1. Continuity checks can indicate only an open fil...

  • Page 11

    5-4 high voltage capacitor 5-5 high voltage diode 5-6 main relay and power control relay 5-7 adjustment of primary switch, door sensing switch and monitor switch 5-2 1. Check continuity of the capacitor with the meter set at the highest resistance scale. 2. Once the capacitor is charged, a normal ca...

  • Page 12

    5-3 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...

  • Page 13

    5-4 alignment and adjustments 1) pour 275±15cc of 20±5˚c(68±9˚f) water in a beaker which is graduated to 600cc, and place the beaker in the center of the oven. 2) start to operate the oven and measure the leakage by using a microwave energy survey meter. 3) set survey meter with dual ranges to 2,450...

  • Page 14: 6. Troubleshooting

    6. Troubleshooting 6-1 precaution 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 wi...

  • Page 15

    6-2 troubleshooting symptom cause corrections oven lamp and fan motor turn on 1. Misadjustment or loose wiring adjust door and latch switches. Of primary latch switch 2. Defective primary latch switch oven can program but timer 1. Open or loose wiring of secondary adjust door and interlock switches....

  • Page 16

    7. Exploded views and parts list 7-1 exploded views 7-1 c1 c2 c3 c4 c5 c6 c7 m36 m35 d6 d1 d2 d3 d5 d4 d10 d7 d9 d8 m1 m2 m21 m22 m23 m24 m45 m25 m26 m37 m38 m39 m15 m14 m16 m18 m19 m41 m20 m3 m4 m5 m6 m7 m8 m9 m10 m12 m13 m46 m11 m44 m42 m17 m4o b1 b2 b2 b3 b4 nc no com m27 m28 m29 m43 m30 m32 m31 ...

  • Page 17

    7-2 main parts list 7-2 exploded views and parts list ref. No. Parts no. Description specification q'ty remarks m 1 de70-30001a panel-outer secc,t0.6,360,1128,epoxy-coati 1 m 2 de63-90035g cushion-rubber dfa20,t2,w190,l100,blk 1 m 3 de61-50575a bracket-upper secc,t0.5,-,-,-,3rd 1 m 4 de47-00001a hea...

  • Page 18

    7-3 7-3 door parts list ref. No. Parts no. Description specification q'ty remarks d 1 de64-40326r door-a abs(hr0370),-,-,-,wht,cme 28gt,ce2933t 1 d 2 de64-40328b door-sub pcabs,-,-,-,blk,ce2933 1 d 3 de94-00075b assy door-e 3rd-1.0,blk,coating 1 d 4 de64-40012a door-c resin-pp(tb53),t2.0,ce945gf,bl ...

  • Page 19

    Parts no. Description specification q'ty remarks de60-10012a screw-tap tite th,+,3,m4,l10,swr10,zpc2,tooth 1 n-f-ea de60-10012a screw-tap tite th,+,3,m4,l10,swr10,zpc2,tooth 1 p-c-ea de60-10012a screw-tap tite th,+,3,m4,l10,swr10,zpc2,tooth 1 s-m-ea de60-10013a screw-assy tap th,2s,4,l12,mswr3,zpc3,...

  • Page 20: 8. P.C.B Diagrams

    8. P.C.B diagrams 8-1 p.C.B diagrams 8-1.

  • Page 21

    8-2 no. Parts no. Description specification q'ty remarks p 1 3501-001050 relay-miniature 24vdc,200mw,5a,1forma,10ms,5ms 2 ry02,ry03 p 2 3501-001062 relay-power 24vdc,523.2mw,16a,1forma,15ms 1 ry01 p 3 3501-001068 relay-power 24vdc,523mw,16a,1forma,15ms,10 1 ry04 p 4 3601-001126 fuse-ferrule 250v,1.6...

  • Page 22: 9. Schematic Diagrams

    9. Schematic diagrams 9-1 schematic diagrams 9-1 condition of oven door is opened brn : brown wht : white red : red blk : black y/g : yellow green blu : blue org : orange yel : yellow cook off wiring color 1.Input : 230v 2.Door : open 3.Lamp : on 4. : p.C.B pattern 5. : p.C.B in/out point magnetron ...