Sanyo EM-D7750ECO Service Manual
Sanyo EM-D7750ECO Service Manual

Sanyo EM-D7750ECO Service Manual

Microwave oven with convection and grill

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SERVICE MANUAL
Read this manual carefully, especially precaution on microwave energy, and follow the procedure
strictly. Careless servicing and testing may expose yourself to the microwave energy leakage.
PRECAUTIONS TO BE OBSERVED BEFORE AND DURING SERVICING TO 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 if 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.
ENG 030
MICROWAVE OVEN WITH
CONVECTION AND GRILL
Co oki ng Ass
ista nt
DIR EC T
AC CE SS
1
2
3
4
1.
2.
3.
/
C
FOREWORD
PRECAUTIONS
FILE No.
EM-D7750ECO
Cooking Assistant
DIRECT
ACCESS
1
2
3
4
1.
2.
3.
/
Product Code No.
EM-D7750ECO
REFERENCE No.
C
43748906
SM
-850240

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Summary of Contents for Sanyo EM-D7750ECO

  • Page 1 FILE No. SERVICE MANUAL MICROWAVE OVEN WITH EM-D7750ECO CONVECTION AND GRILL Cooking Assistant DIRECT ACCESS Co oki ng Ass ista nt DIR EC T AC CE SS Product Code No. EM-D7750ECO 43748906 FOREWORD Read this manual carefully, especially precaution on microwave energy, and follow the procedure strictly.
  • Page 2: Table Of Contents

    TABLE OF CONTENTS Adjustment Procedures........1 Circuit Diagram............ 4 Specifications............2 Test Procedures and Troubleshooting....5-15 Power Output Measurement........ 2 Disassembly Instructions........16-17 Precautions and Repair Service Tips....2 Exploded View and Parts list........18-23 Oven Control Panel..........3 Control Circuit Board..........24 Overall Circuit Diagrams........25 CAUTION MICROWAVE ENERGY PERSONNEL SHOULD NOT BE EXPOSED TO...
  • Page 3: Specifications

    2. SPECIFICATIONS - EM-D7750 4.PRECAUTIONS AND REPAIR SERVICE TIPS PRELIMINARY Rated Power Consumption..Micro. 1450+15%W Conv. 1200+5/-10%W Grill 1100+5/-10%W A.SINCE NEARLY 4,000 VOLTS EXIST IN SOME CIRCUITS OF THIS MICROWAVE Dual 2550+15%W OVEN, REPAIRS SHOULD BE CARRIED (After 15mins.) Microwave Output...... 900W OUT WITH GREAT CARE Frequency........
  • Page 4: Oven Control Panel

    5. OVEN CONTROL PANEL Cooking Assistant DIRECT ACCESS Notes : A "beep tone" sounds when a "pad" on the control panel is touched, to indicate a setting has been entered. When setting the controls you can keep your finger on a key until the desired set- ting is reached.
  • Page 5: Circuit Diagram

    6.CIRCUIT DIAGRAM 230V ~ 50Hz EM-D7750 Continental Version. OVEN CONDITION DOOR : OPEN FUSE (8A T) L1,L2 = 1mH C1 = 0.22µF C2,C3 = 4700PF R = 1MΩ MTCO/ CFTCO TOUCH KEY BOARD S101 CONTROL CIRCUIT SHTCO BOARD HIGH VOLTAGE TRANSFORMER S102 HV FUSE MAGNETRON 2M-219H(B)
  • Page 6: Test Procedures And Troubleshooting

    7. TEST PROCEDURES AND TROUBLESHOOTING Filament Windings CAUTION - DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVING THE CABINET FROM THE UNIT. PROCEED WITH THE TESTS ONLY AFTER DISCHARGING Secondary Winding THE HIGH VOLTAGE CAPACITOR AND REMOVING THE LEAD WIRES FROM THE PRIMARY WINDING OF THE HIGH VOLTAGE TRANSFORMER.
  • Page 7 COMPONENT CHECKOUT PROCEDURE RESULTS 1) Measure the resistance : Normal readings : With an ohmeter on Rx1 scale. a. Primary Winding ; Approximately 1.7 ohms. b. Filament Winding ; Less than 1 ohm. c. Secondary Winding ; Approximately 92 ohms. 2) Measure the resistance : Normal readings : With an ohm-meter on highest scale.
  • Page 8 COMPONENT CHECKOUT PROCEDURE RESULT Measure the resistance: Between the Pin 1 and Normal Reading: Pin 3 of connector S103 after disconnecting Approximately THERMISTOR it from the control circuit board with an 1800K ohms @ 20˚C ohm-meter on the highest scale. 1400K ohms @ 25˚C Normal Reading: CONVECTION...
  • Page 9 COMPONENT CHECKOUT PROCEDURE RESULTS Measure the resistance : Across two terminals with an ohm-meter on its highest scale. Normal reading : Indicates continuity. HV FUSE Abnormal reading : Indicates infinite ohms. Figure 10 Measure the voltage : Between test points TP-1,TP-2 CONTROL and ground ( See control circuit board on page 24 ).
  • Page 10 CHECKOUT PROCEDURE FOR SWITCHES Disconnect the lead wires from the switches and check the continuity of the switches, connecting an ohm-meter to its terminals. SWITCH CHECKOUT PROCEDURES DOOR OPEN DOOR CLOSE Primary Interlock Connect an ohm-meters leads to terminals "COM" and "NO"...
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  • Page 17: Disassembly Instructions

    8.DISASSEMBLY INSTRUCTIONS C. REMOVING MAGNETRON (See exploded view on page 20 ) - OVEN MUST BE DISCONNECTED FROM ELECTRI- (1) Remove the antenna complete according to CAL OUTLET WHEN MAKING REPLACEMENTS, B. REMOVING THE ANTENNA. REPAIRS, ADJUSTMENTS, AND CONTINUITY (2) Disconnect the 2 lead wires from the magnetron. CHECKS BEFORE PROCEEDING WITH ANY REPAIR (3) Remove 1 screw securing the duct to the WORK AFTER DISCONNECTING.
  • Page 18 4. The hinge screws should then be tightened to hold the (3) Remove power cord from cavity assembly by door in place, and the feeler gauges removed. lifting cord bush, moving it to the left and pulling it 5. The door gap should then be checked again using feeler away from cavity rear plate.
  • Page 19: Exploded View And Parts List

    9. EXPLODED VIEW AND PARTS LIST CAVITY PARTS-A EM-D7750 Part No. Description Q'ty Part No. Description Q'ty 617 223 1198 Cavity Assembly 19 617 177 3231 Motor Complete 617 188 0595 Cabinet 20 617 202 4561 Thermostat, V122˚C 617 221 5433 Duct 21 617 177 3200 Heater Ass’y 617 202 4554 Thermostat, V150˚C 22 617 117 6698 Collar...
  • Page 20 CAVITY PARTS-B EM-D7750 Part No. Description Q'ty 617 177 3156 Antenna Complete 617 169 8930 Cavity Cover 617 212 8177 Thermistor Ass’y 617 206 5717 Frame Rear Plate 617 206 5083 Cook Net 617 206 5090 Cook Net 411 156 5601 SCR TPG PAN+F+S 4x10 411 165 0406 SCR TPG TRS 4x10 SUS 411 053 9306 NUT HEX +LFLC W/SRT 4 1 10 412 048 6508 SCR TPG TRS 4x10...
  • Page 21 SWITCHES AND MICROWAVE PARTS EM-D7750 Part No. Description Q'ty Part No. Description Q'ty 617 220 1764 Duct 411 156 5601 SCR TPG PAN+F+S 4x10 617 195 3428 Latch Lever 411 156 5502 SCR S-TPG PAN +F+S 4x10 617 189 0839 Lever Stopper 617 213 2990 Power Cord Ass’y...
  • Page 22 MICROWAVE PARTS EM-D7750 Part No. Description Q'ty 617 209 4557 Transformer 617 225 1721 Special Screw 617 220 7957 Bottom Plate ------------------ Gear Motor Cover 617 144 5435 Foot Cushion Assembly 617 166 7493 Bottom Hinge 411 156 5502 SCR S-TPG PAN+F+S 4x10 3 -21-...
  • Page 23 DOOR PARTS Inner Door Panel always O 2 @ @ @ @ @ 6 K ? O 2 @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 6 K O 2 @ @ @ @ @ @ @ @ @ @ @ @ @ 6 K ? W 2 @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ @ 6 K ? ? W &...
  • Page 24 CONTROL PANEL PARTS A u t D e f . D u a l G r i l l T i m S t a r 1 5 0 3 0 0 4 5 0 7 0 0 8 0 0 EM-D7750 Part No.
  • Page 25: Control Circuit Board

    10.CONTROL CIRCUIT BOARD EM-D7750 Model Version Spares No. M.Processor EM-D7750 Semo 617 220 8374 IC11 LM8856 -24-...
  • Page 26: Overall Circuit Diagrams

    11. OVERALL CIRCUIT DIAGRAM EM-D7750ECO IC 11 LM8856 -25-...
  • Page 27 Please Note All the information that appears in this service manual was correct at the time of production. SANYO Electric Manufacturing reserves the right to make changes to parts or processes in order to maintain their policy of continuing improvement.

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