Advertisement
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 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 compart-
ments, 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.
Microwave Oven
Foreword
PRECAUTIONS
EM-C1900 (GERMANY)
Pro.Code No. Model No.
437 623 01
EM-C1900SD
REFERENCE NO.
SM-6410022-00
Advertisement
Related Manuals for Sanyo EM-C1900
Summary of Contents for Sanyo EM-C1900
- Page 1 SERVICE MANUAL EM-C1900 (GERMANY) Microwave Oven Pro.Code No. Model No. 437 623 01 EM-C1900SD Foreword 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.
-
Page 2: Table Of Contents
- TABLE OF CONTENTS - Adjustment Procedures ..........1 Test Procedures and Troubleshooting ....4-10 Specifications ............2 Disassembly Instructions ........11-14 Power output Measurement ........2 Exploded View and Parts List ......15-22 Precautions and Repair Service Tips ......2 Overall Circuit Diagram........23-24 Circuit Diagram ............ -
Page 3: Specifications
(1) Before the power is applied. 2.SPECIFICATIONS (a) Open and close door several times to make sure Microwave output ....1,900W to 190W the door interlock switch and interlock monitor Frequency ......2,450MHz switch operation properly. (Listen for the click- Power supply ....... -
Page 4: Caution
FUNCTION OF KEY SWITCHES Please read each function key below. Power Key Memory Key Start Key Clear Key Time Key Primary Secondary 6. TEST PROCEDURES AND TROUBLESHOOTING Winding windings CAUTION -DISCONNECT THE POWER SUPPLY CORD FROM THE WALL OUTLET WHENEVER REMOVING THE CABINET FROM THE UNIT. - Page 5 COMPONENT CHECKOUT PROCEDURE RESULT 1) Measure the resistance: With an ohm meter on Rx1 scale. Normal reading: HIGH-VOLTAGE a. Primary winding; a. Approximately 1.0 ohms. TRANSFORMER b. Filament winding; b. Less than 1 ohm. c. Secondary winding; c. Approximately 60 ohms. 2) Measure the resistance: With an ohm meter on highest scale.
- Page 6 COMPONENT CHECKOUT PROCEDURE RESULT When When not Measure the resistance between terminals of touched touched Resistance FPC connector after removing it from TOUCH KEY Less than More than Value S101.(Figure 9) BOARD 1K ohms 1M ohms NOTE - When reconnecting the FPC connector, make When checking “...
- Page 7 Primary WARNING: winding When removing the cabinet, you must disconnect the power supply cord from the wall outlet for your safety. Only the checkout procedure below needs the power supply on. TAKE GREAT CARE to avoid possible shock. Primary For your safety, proceed with the test only after re- winding moving the wire leads from the primary winding of the high voltage transformer.
-
Page 8: Control Circuit Board
B. TROUBLESHOOTING CONDITION TROUBLE CHECK RESULT REMEDY Power with normal voltage is applied. Place Replace a cup of water inside Shorted S t e p d o w n microwave oven Transformer “ ”,“ 1 ”,“ 0 ”,“ 0 ” and “... - Page 9 CONDITION TROUBLE CHECK RESULT REMEDY Low microwave Poor Replace Magnetron output oscillation Gear motor Repair or Rotation of top or Uneven heating rotation has replace bottom antenna stopped. C. ERROR INDICATION The Display will show an error indication for self diagnosis as follows. "E"...
- Page 10 Thermistor Chart Thermistor connector Duct 8000 7000 6000 5000 4000 3000 Magnetron 2000 1000 Temperature (°C) “HINT” PROCEDURE FOR DETERMING WHETHER THE UPPER MAGNETRON CIRCUIT OR LOWER MAGNETRON CIRCUIT IS DEFECTIVE. SYMPTOM:One magnetron does not work giving less than normal heat. Caution: Make sure that cabinet (outer wrap) and rear plate are not removed from the oven for your safety.
- Page 11 7. DISASSEMBLY INSTRUCTIONS interlock switch, the relay 3 and 4 (on the control circuit - OVEN MUST BE DISCONNECTED FROM ELECTRI- board) and the interlock monitor switch according to CAL OUTLET WHEN MAKING REPLACEMENTS, RE- “CHECKOUT PROCEDURE FOR SWITCHES” on page PAIRS, ADJUSTMENT AND CONTINUITY CHECKS 6.
- Page 12 F. CHANGING POWER SUPPLY CORD I.HOW TO RESET THE MEMORY OF ACCUMULATIVE (See exploded view on page 15) COOKING TIME (1) Unfasten 1 screw for earth and pull out 2 wires of power cord from terminal plate. 1. Push the keys step by step as follows, (2) Remove 1 screw for bottom bracket of cord bushing.
- Page 13 L. ADDITIONAL FUNCTIONS The following functions can be completed by the key operation described below. The Accumulative cooking time and the number of door opening/ closings can be observed. The Type and level of the buzzer sound can be selected. The “display of remaining cooking time when cooking is temporarily stopped due to door opening”...
- Page 14 Maintenaunce: The microwave ovens are designed, manufactured, and tested for years of dependable operation. Howevre, the oven may require service from time to time if the consumable components listed below are not replaced at the appropriate time. For protection from unexpected service calls and undue inconvenience, we recommend that the user has the listed parts replaced at the intervals belows,(at customer cost).