Sanyo EM-D9750ECO Service Manual Download Page 9

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COMPONENT CHECKOUT PROCEDURE RESULTS

Measure the resistance : Across two terminals with an
ohm-meter on its highest scale.

Normal reading :
Indicates continuity.

Abnormal reading :
Indicates infinite ohms.

Measure the voltage : Between test points TP-1,TP-2
and ground. ( See control circuit board on page 24 ).

NOTE

Proceed with the check of the step down transformer, to
see if any one of the measured values is different from the
specified values

Figure 10

-8-

HV FUSE

Test TP-1 TP-2

point

Voltage -5V -15V

DC DC

CONTROL
CIRCUIT
BOARD
COMPLETE

Measure the resistance between terminals of FPC
connector after removing it from S101. ( See Figure
11).

NOTE

- When reconnecting the FPC connector, make sure
the holes on the connector are properly inserted in
hooks of the plastic fastener in S101.

MATRIX CIRCUIT FOR TOUCH
KEYBOARD FPC CONNECTOR

TOUCH KEY
BOARD

TERMINALS OF FPC CONNECTOR

Figure 11

When When not

Resistance touched touched

Value

Less than More than
1K Ohms 1 MEG

Ω

When checking the "START" key, con-
nect Ohmmeter as illustration below.

MICRO

POWER

BAKED

POTATO

CHICKEN

PIECES

CASSE-

ROLE

QUICK
START

CONVEC.

TEMP

GRILL

MORE/

LESS

BAKED

FISH

CHOPS/

STEAKS

COMBI-

NATION

START

SLOW
COOK

FROZEN

PIZZA

CLEAR/

STOP

KITCHEN

TIMER

AUTO

DEFROST

CAKE/

PUDDING

SNACKS

ROAST

JOINT

T OP

A3
A4
A5
C1
C2
C3

A1
A2

C4
C5

Ohm-meter

1
2

3
4
5
6
7
8

9
10

Summary of Contents for EM-D9750ECO

Page 1: ... W Y g7 0M I 0M I4 W 7 e7 e7 5 e H 7 1 H f 5g7 g g7 H he3 L 7 Hg J M V4 L J M I4 7 e e H e e gJ Hg g 5 g hfN 1 J 5 gW 0Y I4 1 7 Y I J L 5 e 5 e e J e J g7 g 5 f J H g hf 3 L W Y g7 0M I Y V4 7 1 H J H J e 7 5e L 7 g g H f 7 g J hf N 1 7 Hh M V L Y J e 7 e 7 e He 1 5f J f J g g 7 J g J 0Y V 1 J Y 3 7 J e 5e 5e eJ L Hf 7 f 7 g g 5 3 W hW M V 7 Y V J 7 5e He He e7 1 f f g 5g H N L hf 7 5 h7 Y V L H N...

Page 2: ...curely locked 3 Tighten the lever stopper screws securely 4 Make sure the interlock monitor is closed after the primary interlock switch opens when the door is opened very slowly according to CHECKOUT PROCEDURE FOR SWITCHES on page 9 5 Make sure the interlock monitor is open before the primary interlock and secondary interlock switches close when the door is closed very slowly according to CHECKOU...

Page 3: ...ING PRECAUTIONS MUST BE TAKEN BEFORE SERVICING 1 Before the power is applied a Open and close door several times to make sure the primary interlock switch the door sensing switch and the interlock monitor switch operate properly Listen for the clicking sound from switches Make sure the interlock monitor switch is closed after the primary interlock switch is opened when the door is opened See pages...

Page 4: ...ed set ting is reached 3 13 11 12 15 9 7 5 8 6 1 2 1 DISPLAY WINDOW 2 Function and Accessary Indicator KEYS 3 Direct Access menu keypad 4 Kitchen Timer 5 Auto Defrost 6 Time adjust for Auto Defrost and Direct Access 7 Grill only 8 Convection Temp only 9 Microwave Power 10 Slow Cook 11 Dual Cook 1 Convection Micro 2 Convection Grill 3 Micro Grill 12 Quick Start 13 Clear Stop 14 Start 15 Time and We...

Page 5: ... 1 3 3 1 hf J I4 1 W M e 3 hf hf3 e J V4 0Y Lh O hf f g3 Lh W g he 3 5heN Lhe 7 H f g g he J g Lhe J f N L he W 5g h he g g3 1 he J f he 3 3 hf W26X hJ MI Xg 3 hf W2 e L N N hf 7 I W Y 5 e N L he hfN Le 7 5 5 3 K f O2 hf f gV X gW g he N Hhe 3 X hJ 5g g Lg3 LheW L f 3 X h 7 g3 1 he 7 3 Hg3 5 h he g gN Lhe 7 f he N N Lhf 7 1 g W HeN X f N hf 7 5e 3 1 W2 g L hfW2 f Lhf N 7 0Y Lhf J H f 1 he 5hf 1eJ ...

Page 6: ...gnetron is operating correctly and producing any other power setting apart from full power 7 TEST PROCEDURES AND TROUBLESHOOTING CAUTION DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVING THE CABINET FROM THE UNIT PROCEED WITH THE TESTS ONLY AFTER DISCHARGING THE HIGH VOLTAGE CAPACITOR AND REMOVING THE LEAD WIRES FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER See Fig...

Page 7: ...tes several ohms and gradually returns to 10 Meg ohm Abnormal reading Indicates continuity or 10MΩ from the beginning Measure the resistance Across two terminals with an Normal reading ohm meter on its highest scale Indicates over 10MΩ 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 meters may show ...

Page 8: ...ading Approximately 300 ohms Normal Reading Approximately 180 ohms Normal Reading Approximately 16K ohms Measure the resistance After removing the lead wires from the convection heater with an ohm meter on R x 1 scale Measure the resistance After removing the lead wires from the grill heater with an ohm meter on R x 1 scale Measure the resistance After removing the lead wires from the blower motor...

Page 9: ...s of FPC connector after removing it from S101 See Figure 11 NOTE When reconnecting the FPC connector make sure the holes on the connector are properly inserted in hooks of the plastic fastener in S101 MATRIX CIRCUIT FOR TOUCH KEYBOARD FPC CONNECTOR TOUCH KEY BOARD TERMINALS OF FPC CONNECTOR Figure 11 When When not Resistance touched touched Value Less than More than 1K Ohms 1 MEG Ω When checking ...

Page 10: ...es connecting an ohm meter to its terminals Primary Interlock Door Sensing Connect an ohm meters leads to terminals COM and NO of switch Interlock monitor Connect an ohm meters leads to terminals COM and NC of switch CAUTION After checking the switches make sure that the interlock monitor switch is properly connected according to the CIRCUIT DIAGRAM on page 4 9 ...

Page 11: ...has blown see D REMOVING FUSE on page 16 0 230 0 Volt 0 230 230 Volt PROBLEM 1 b Control Circuit Board Check power supply voltage on control circuit board See page 8 Voltage incorrect Replace it if necessary Correct seating of connector S101 or replace control circuit board Replace touch keyboard Check resistance of touch keyboard See page 8 0 V 0 V Each Voltage OK 0 Check Resistance OK 0 Resistan...

Page 12: ...nector S102 between pins with the door closed after removing connector S102 from control cct board Check contact of connector S102 PROBLEM 3a Correct Seating Poor Contact Normal Contact Contact OK Normal Door Sensing Switch Touch START key and measure voltage between the two wire leads from primary windings of H V transformer after removing the wire leads from terminals of H V transformer Replace ...

Page 13: ...esistance of blower motor Approx 300 ohms No Operation Normal thermal protector for magnetron or thermal protector for cavity Normal Operation Temporarily short across terminals of thermal protector for magnetron or thermal protector for cavity by using jumper lead No Operation Normal Operation PROBLEM 3 b Check operation of blower motor when START key is touched Check resistance of each winding a...

Page 14: ...s down when key is touched for Grill Cooking a Normal control circuit board Replace Heater 52 Normal Resistance 0 Resistance Incorrect Runs 100 150 450 700 850 Auto Start Def Time 1000 Check resistance of heater Approximately 48 7Ω measured over both terminals Set power level at low Touch START key and measure voltage between leads for primary winding of H V transformer after removing the wire lea...

Page 15: ...counts down when key is touched for Convection Cooking a Replace Heater 52 Normal Resistance 0 Resistance Incorrect Runs Runs 14 Check resistance of heater Approximately 46Ω measured over both tubes Normal Heater PROBLEM 3 b Normal Operation Normal convec Motor Measure resistance of convec motor Approx 300 ohms No Operation Normal thermal protector for magnetron or thermal protector for cavity or ...

Page 16: ...n 3 of connector S201 after removing from control circuit board Normal Oven Thermistor 9 PROBLEM Overheating even if the display window shows 160C for preheating Check normal operation of control circuit board and power circuit board NOTES When the oven thermistor circuit is open the display window will continuously show 160C even if the unit becomes overheated by continuous ON of the heater When ...

Page 17: ... the waveguide Take out the magnetron VERY CAREFULLY NOTES When removing the magnetron make sure that its dome does not hit any adjacent parts or it may be damaged After replacing the magnetron be sure to check the microwave energy leakage with a leakage detector and confirm the leakage is below 5 mW cm2 D REMOVING FUSE A Remove the 8A fuse with a screwdriver When replacing the 8A fuse be sure to ...

Page 18: ... release the hooks one by one 4 To detach the glass door panel insert a thin flat blade screwdriver between the door panel and door cover and release the clips one by one NOTES The choke dielectric the glass door panel and the door cover may be damaged when they are removed When re installing them replace them with new ones if they are damaged After installing the door in place check for microwave...

Page 19: ...28 34 1 5 4 7 8 9 10 11 33 12 13 15 14 29 31 36 35 27 16 17 19 30 32 20 34 21 25 26 22 24 23 18 9 EXPLODED VIEW AND PARTS LIST CAVITY PARTS A 18 Key Part No Description Q ty No 19 617 075 1476 Fan Base 1 20 617 177 3231 Motor Complete 1 21 617 202 4561 Thermostat V122 C 1 22 617 177 3200 Heater Ass y 1 23 617 117 6698 Collar 1 24 617 177 3217 Heater Case Ass y 1 25 617 177 3255 Heat Ins 1 26 617 1...

Page 20: ... 1 9 617 149 3009 Lamp 1 10 617 214 3521 Response Switch 1 11 617 177 3408 Lamp BCT 1 12 617 177 3309 Cam 1 13 617 177 3293 Damper 1 EM D9750 Key Part No Description Q ty No 14 617 179 0771 Damper Bct 1 15 617 179 0757 Shaft 1 16 617 177 3149 Lamp Plate 1 17 617 183 1368 Cook Net 1 18 617 183 1375 Cook Net 1 19 411 156 5601 SCR TPG PAN F S 4x10 3 20 411 156 5502 SCR S TPG PAN F S 1 21 411 001 6005...

Page 21: ... g g g J g 7 g J 5 g 7 Y g J H g 7 5 g J H g 7 5 g Y g J H g 7 g J 5 g 7 H g J 5 g 7 H g g he g J he g 7 he g J 5 he g 7 Y he g 0M e Yhf g H hf g 5 g H g 5 g Y g hf g 5hf g Yhf g Y hf g Y g Y g H g J 5 g 7 Y g Y g H g J 5 g 7 Y g Y g H g J 5 g 7 Y g 0Y g g g g g g g g g g g g g g g g g g J g 7 g J 5 g 7 Y g J H g 7 5 g J H g 7 5 g Y g J H g 7 g J 5 g 7 H g J 5 g 7 H g g he g J he g 7 he g J 5 he g...

Page 22: ... f Y f H f J 5 f 7 Y f Y f H f J 5 f 7 Y f Y f H f J 5 f 7 Y f 0Y f f f f f f f f 2 4 7 5 8 1 3 6 MICROWAVE PARTS Key Part No Description Q ty No 1 617 221 1541 Bottom Plate 1 2 617 187 1241 Transformer 1 3 617 225 1721 Special Screw 2 4 Gear Motor Cover 1 5 617 144 5435 Foot Cushion Assembly 4 6 617 166 7493 Bottom Hinge 1 7 411 156 5502 SCR S TPG PAN F S 4x10 1 8 617 102 7495 Special Screw 2 21 ...

Page 23: ...2 617 177 1473 Door Panel 1 3 617 136 3890 Door Main Frame 1 4 617 103 8934 Hinge Ass y 1 5 617 102 7495 Special Screw 2 6 617 135 6243 Choke Di electric 1 7 617 136 3913 Door Panel 1 8 617 139 9530 Door Latch 1 9 617 135 8285 Spring 1 10 411 071 9104 Screw 3 617 222 5692 Door Ass y 1 22 EM D9750 ...

Page 24: ...1 064 2709 SCR TPG BIN 3x14 2 7 411 064 6608 SCR TPG BIN 3x8 1 8 617 135 8407 Latch Lever 1 9 617 188 3329 Spring 2 23 These items not illustrated CONTROL PANEL PARTS EM D9750 1 11 12 Key Part No Description Q ty No 10 617 220 1535 Handle Lever 1 11 617 197 4836 PCB Complete 1 12 617 198 5146 Knob Assembly 1 617 225 1813 Inst Manual French 1 617 225 1820 Inst Manual German 1 617 225 1837 Inst Manu...

Page 25: ...10 CONTROL CIRCUIT BOARD EM D9750 24 Model Version Spares No RL7 M Processor EM D9750 Semo 617 220 8305 Yes LM 8838 TP1 TP2 ...

Page 26: ...SS VSS C105 0 1u 25V P55 CNTR1 VCC VREF P42 INTO C103 0 01u 50V R125 10K D115 R140 10K C104 0 01u 50V R104 10K Q111 A564A R126 10K 24 5V 2 1 R202 8 45K R203 10K P61 AN1 OPEN 13 73 74 P46 OPEN 20 P44 OPEN 22 P45 21 2 2K 10K Q105 DTA123Y 2 2K 10K Q107 DTA143X 4 7K 10K Q110 DTA143X R126 R127 R128 R129 10K 100K 100K 100K 5V 80 1 2 VL3 VL2 VL1 5V 31 30 RS1 4MHZ XIN XOUT OPEN OPEN OPEN OPEN 34 35 28 29 ...

Page 27: ... 3 W Yg7 L J J 5 7 H 7 e He7 7 Hg g g J h g N L 7 H f J 1 7 W J H e e e L g 5 g g 7 g J 5h3 1 J 5gW L J L 7 L 7 e e 5e e 1 g H f J 5g 5g 7 HhN W Yg7 1 7 1 J 1 e 5e HeJ e f J g 7 Hg Hg h L 7 Y f J L J 0M f I4 7 5e He e7 e L J f 7 g gJ g h 3 1 J YgW 0M he I4 1 7 0M I4 J J HeJ eJ e 5 J X 7 5 f gJ g7 gJ 5 h N W Y g7 0M I 0M I4 W 7 e7 e7 5 e H 7 1 H f 5g7 g g7 H he3 L 7 Hg J M V4 L J M I4 7 e e H e e g...

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