Sanyo EM870FS Service Manual Download Page 3 | Manualshive

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Summary of Contents for EM870FS

Page 1: ...tivating 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 cl Before turning on microwave power for any service test or inspection within the microwave generating compartnlents check the magnetron wav...

Page 2: ...hed forward and pull backward until thele is about zero gap between the latch lever and the switch body On the primary interlock switch and at the same time there is about zero gap between the door latch and the switch body on the door sensing switch when the door latch is securely locked Tighten the lever stopper screws securely Make sure the interlock monitor switch closes after the primary inte...

Page 3: ...Rs SHOULD BE CARRIED OUT WITH GREAT CARE B TO AVOID POSSIBLE EXPOSURE TO MlCROWAVE ENERGY LEAKAGE THE FOLLOWING PRE CAUTIONS MUST BE TAKEN BEFORE SERVICING 1 Before the power is applied a Open and close door serveral times to make sure the primary interlock switch the interlock monitor switch and the door sensing switch operate proper ly Listen for the clicking sound from the switches Make sure th...

Page 4: ... CONNECTOR L i J I 5 S102 I i RELAY 1 R STEP 00WN FUSE DIOOE I TRANSFORMER _T I 10 I DOOR c SENSING DIODE I 0 97MF0 I CONTROL I SWITCH I CIRCUIT BOARD I I 10MEG OHM I I I c CONNECTOR I I J Slol I I 1 L J 1 BK I WIRING COLOR Notas Th sign Th parts markad with ar s rw i d high voltage which is xcaadad 250V BK BLACK BR BROWN Tha sign The Patts markad with hava special w WHITE GY GRAY charactcristia i...

Page 5: ...ors are heated by themselves at about 200 C when the oven is plugged in The thermistor in a dry air compartment is cooled by the influence of air temperature and the thermistor in an open compartment is cooled by not only the air temperature but also evapo ration of the moisture in the air around the sensor If the sensor is in a dry air the both thermistors in the sensor have the same resistance v...

Page 6: ... COOKl NG for cooking fresh or frozen fcxxk couRsE lFOOD CATEGORy COURSE l FOOD CATEGORY The oven automatically sets to medium if no selec ticm is made If you prefer to have your food reheated or cooked moore or less than the preset medium setting touch cne of the two DONENESS keys befcx tcuching START When a different doneness is chosen from the pres et medium 2 it is confirmed with a number l to...

Page 7: ...crcwave operation Make sure to use the correct food category or reh eat course for the food that is to be reheated or cooked The oven door must remain closed while display sh ows course indication C1 2 C2 2 A1 2 and so cm unless PAUSE appears in the display If the door is opened Err error will flash in the display This indicates the operation must be r reprogrammed into the oven NOTE The oven door...

Page 8: ...e moisture escaping from food to the sensor Air flow is shown by shaded arrows in Figure 5 The air from the blower motor goes into cavity inside and carries the moisture escaping from the food being reheated to the sensor CAUTIONS The stirrer cover inside of the oven cavity acts as an air partition between the air for rotating the stirrer fan and the air for carrying the moisture escaping from foo...

Page 9: ...ent terminals of the magnetron with an ohmm eter on R x i scale 1 r ohm meter w 2 Check for resistance Between each fila ment terminal of the magnetron and the chassis ground with an ohm meter on highest scale ohm meter G Q Figure 8 1 Measure the resistance With an ohm meter on R x 1 scale a Primary winding b Filament winding c Secondary winding 2 Measure the resistance With an ohm meter on highes...

Page 10: ...ified values RESULT Normal reading Momentarily indicates several ohms and gradually returns to 10 meg ohms Abnormal reading Indicates continuity or 10 megohms from the beginning Normal reading Indicates about the middle position in one direction forward direction and infinite ohms in the reverse direction using meter which is provided with a 9 volt battery NOTE Some digital meter may show over eve...

Page 11: ...key connect ohm meter as illustration below a G3 ohm meter Top F t TERMINALS OF FPC CONNECTOR Figure 13 CHECKOUT PROCEDURE FOR SWITCHES Disconnect the lead wires from the switches and check for the continuity of the switches connecting an ohmmeter to its termi nals 1 SWITCHES See Figure 1 on page 1 CHECKOUT PROCEDURES DOOR OPEN DOOR CLOSED I Primary Interlock Terminals COM and NO Door Sensing Q In...

Page 12: ...xh2r fw PROBLEM _ Magnetron __ I 14 1 240 vOlt I I I I b I Conlrol circuit board Check power supply voltage on control circuit board See page 9 Touch key board 000 000 000 Each voltage Check resistance of OK touch key board See page 6 1 l I I Each resistance Correct seating of Normal control I Runs OK connector S101 or circuit board I I replace control I circuit board I I I r I 000 000 000 I I Res...

Page 13: ...ho door Poor Correct Normal I cQntact seating contact closed after rerrtthrin connector S102 from _ _ control circuit board No AdjusI or replace Normal door 1 Rum continuity door sensing switch sensing switch i See page 11 1 3 PROBLEM Oven does not heat up I I 1 I L ti a I 3b AC 240 Volts I I I I I Touch START key and I measure voltage between 1 J white wire Iea l and black wire lead for primary I...

Page 14: ... i L c u L i LL z a u 1 U i f 1 6 l I 1 I 13 ...

Page 15: ...stire volfage bebA en at 50 white wire lead and black I wire lead for primary I winding of H V trans 240V Replace control Normal control 1 Runs former after removirq circuit board I the wire leads from circuit board terminals of H V I transformer I I I I I 1 6 PROBLEM I No buzzing by touching keys I and at the end of cooking I I I 1 I I I Check normal operation I Replace control Normal control I R...

Page 16: ... to l AD JUSTMENT PROCEDURES on page 1 after it is replaced with new one and check proper operation of it according to CHECKOUT PROCEDURE FOR SWITCHES on pagelo Lower Switch Stopper Figure 14 a Upper Switch Stopper B REMOVING PRIMARY INTERLOCK SWITCH AND INTERLOCK IMONITOR SWfTCfi See Figure b 1 2 3 Disconnect all wire leads from primary interlock and interfock monitor switch Pull the primary inte...

Page 17: ...e thermal protector Disconnect 2 lead wires from the magnetron Remove 3 screws securing the magnetron to the waveguide Take out magnetron VERY CAREFULLY NOTES When removing the magnetron its dome does not hit any adiacent be damaged make sure that parts or it may When replacing the magnetron be sure to install the magnetron gasket in the correct position and be sure that the gasket is in good cond...

Page 18: ...diode is defective replace not only the high voltage diode but also the fuse diode F REMOVING CONTROL CIRCUIT BOARD See exploded view on page 22 and Figure 17 1 2 3 4 5 Remove the connector S1 S102 and the connector for the relay 2 from the control circuit board Remove 1 screw securing the control panel com plete to the oven cavity Remove the FPC connector from the connector S101 while grasping UP...

Page 19: ...hin flat blade screwdriver between the door cover and door main frame Hooks Hooks Door Main I Choke Dielectric NOTES The choke dielectric may be damaged when it is removed When reinstalling it replace it with new ones if they are damaged Atter installing the door in the place check for microwave energy leakage with a leakage detector Microwave energy leakage must be below the limit of 5 mW cm2 J R...

Page 20: ...s Hd Tapping 4 x 10mm 11 Lockwasher External Tooth 4mm U 2 Own Cavity Not service Part 1 Bottom Plate 1 Plastic Foot with Canoe Clip 4 Bolt Hex Hd Machine with Spring Washer Bolt Washer 5x 14mm Zl 2 Hinge Lower 1 Washer 5mm U 1 SCR S TPG PAN 4 x 10mm 2 Gear Motor M2 LJ50ZA 12 1 Insulation Sheet 1 Key Part No No Description a ty 13 14 6171147162 Turn table Shaft 1 15 617 1242416 Roller 1 16 617 109...

Page 21: ...mplete 1 11 6171170023 Lead Wire Ass y with Diode 1 12 6171315868 Lead Wire Ass y Transformer to Capacitor 1 13 6171241334 Capacitor 8and 1 14 6171306934 High Voltage Capacitor including Resistor 0 97uf 2 4KV 1 15 6171241082 Space Partition Blower 1 16 6171306927 810wer Motor BM 800SAP 1 17 411 0772109 Screw Truss Hd Tapping 4 x 20mm Z1 1 2 18 6170751179 Blower Fan 1 G No 19 20 21 22 23 24 25 26 2...

Page 22: ...6469 2 6171246476 3 6171246414 I 4 6171246490 5 6171246483 Door Cover Door Panel Door Main Frame Also order Door Sheet when replacing Door Main Frame Choke Dielectric Door Sheet 1 1 1 1 1 6 411 0541903 Nut Hex Hd with Washer 5mm 2 1 Key No 7 8 9 10 11 Part No 6171240955 411 011 0802 6170806503 617101 1494 617101 1487 10 Description Q ty Hinge Upper 1 Bolt Hex Hd Machine with Spring Washer and Bolt...

Page 23: ...et when replacing Touch Key Board Control Plate Control Frame Lockwasher External Tooth 4mm 1 1 1 1 1 PRINTED MATTER Item Not Illustrated 1 ey I Part No Description I Q ty No 6171313277 Operating instructions 1 617138519 Carton Box 1 TECHNICANUSING PARTS IDENTIFIED Key Part No No Description Q ty 6 411 0825201 Screw Truss Hd Tapping I I 7 6171284089 8 6171305173 9 411 1295805 I 10 6170809559 11 61...

Page 24: ... ii CONTROL CIRCUIT BOARD Part No 617 130 5173 2 TP 4 TP 5 TP 6 TP TP 3 Ground TP 2 1 ...

Page 25: ... l ___ ___ _q _ _ _ I I h Ill _Yt I 1 I 7 E I t o w I I J _ _ l I B19BW1 t ol I 1 I I I I I I I I J IWW I 0 m N I t 3CJ I ii I_ __ __ l 1 m ...

Page 26: ...SANYO NEW ZEALAND LTD ...

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