Sharp R-CD1200M

CONTENTS
PRECAUTIONS TO BE OBSERVED BEFORE
AND DURING SERVICING TO AVOID POSSIBLE
EXPOSURE TO EXCESSIVE MICROWAVE ENER-
GY
CHAPTER 1. WARNING TO SERVICE PERSON-
NEL
[1] Before Servicing.......................................... 1-1
[2] When the testing is completed,................... 1-1
[3] After repairing.............................................. 1-1
CHAPTER 2. MICROWAVE MEASUREMENT
PROCEDURE
CHAPTER 3. FOREWORD AND WARNING
CHAPTER 4. PRODUCT DESCRIPTION
[1] SPECIFICATIONS ...................................... 4-1
[2] GROUNDING INSTRUCTIONS.................. 4-1
[3] OVEN DIAGRAM ........................................ 4-2
CHAPTER 5. OPERATION
[1] DESCRIPTION OF OPERATING SE-
QUENCE .................................................... 5-1
[2] OVEN SCHEMATIC .................................... 5-2
[3] DESCRIPTION AND FUNCTION OF
COMPONENTS .......................................... 5-3
CHAPTER 6. TROUBLESHOOTING GUIDE
CHAPTER 7. TEST PROCEDURES
[1] A: MAGNETRON ASSEMBLY TEST.......... 7-1
[2] B: POWER TRANSFORMER TEST ........... 7-1
[3] C: HIGH VOLTAGE RECTIFIER (1)
AND/OR (2) TEST ...................................... 7-1
[4] D: HIGH VOLTAGE CAPACITOR (1)
AND/OR (2) TEST ...................................... 7-2
[5] E: SECONDARY INTERLOCK SWITCH
(1) AND/OR (2) TEST ................................. 7-2
[6] F: PRIMARY INTERLOCK SYSTEM
TEST........................................................... 7-2
[7] G: MONITOR SWITCH (1) AND/OR (2)
TEST........................................................... 7-3
[8] H: BLOWN MINITOR FUSE TEST ............. 7-3
[9] I: FUSE 12A (1) (2) TEST ........................... 7-4
[10] J: TEMPERATURE FUSE TEST ................ 7-4
[11] K: MAGNETRON THERMISTOR TEST..... 7-4
[12] L: EXHAUST THERMISTOR TEST ............ 7-4
[13] M: NOISE FILTER TEST ............................ 7-5
[14] N: KEY UNIT TEST..................................... 7-5
[15] O: CONTROL UNIT TEST .......................... 7-6
[16] P: POWER UNIT TEST .............................. 7-6
[17] Q: RELAY UNIT TEST ................................ 7-6
[18] R: ANTENNA SENSOR TEST .................... 7-7
[19] S: MICROWAVE SENSOR TEST ............... 7-7
CHAPTER 8. TOUCH CONTROL PANEL ASSEM-
BLY
[1] SPECIAL FUNCTION FOR SERVICING..... 8-1
[2] SERVICING FOR BRINTED WIRING
BOARDS..................................................... 8-4
CHAPTER 9. PRECAUTIONS FOR USING LEAD-
FREE SOLDER
CHAPTER 10. COMPONENT REPLACEMENT
AND ADJUSTMENT PROCEDURE
[1] WARNINGS .............................................. 10-1
[2] OUTER CASE AND REAR COVER RE-
MOVAL...................................................... 10-1
[3] POWER TRANSFORMERS (1) AND/
OR (2) REMOVAL ..................................... 10-2
[4] MAGNETRONS (1) AND/OR (2) RE-
MOVAL...................................................... 10-2
[5] MAGNETRON THERMISTOR ASSEM-
BLY REPLACEMENT ............................... 10-2
[6] HIGH VOLTAGE CAPACITOR AND
HIGH VOLTAGE RECTIFIER ASSEM-
BLY REMOVAL ......................................... 10-2
[7] POWER SUPPLY CORD REPLACE-
MENT........................................................ 10-3
[8] HOW TO RELEASE THE POSITIVE
LOCK CONNECTOR. ............................... 10-3
[9] EXHAUST FAN REMOVAL....................... 10-4
[10] FAN MOTORS REMOVAL ........................ 10-4
[11] ANTENNA MOTORS (UPPER AND
LOWER) REMOVAL ................................. 10-4
[12] POWER UNIT REMOVAL......................... 10-4
[13] RELAY UNIT REMOVAL........................... 10-4
[14] CONTROL PANEL ASSEMBLY AND
CONTROL UNIT REMOVAL..................... 10-4
[15] DOOR SENSING SWITCH/SECOND-
ARY INTERLOCK SWITCHES (1), (2)
AND MONITOR SWITCHES (1), (2) RE-
PLACEMENT ............................................ 10-5
[16] DOOR SENSING SWITCH/SECOND-
ARY INTERLOCK SWITCHES (1), (2)
AND MONITOR SWITCHES (1), (2) AD-
JUSTMENT............................................... 10-5
[17] DOOR REPLACEMENT ........................... 10-6
[18] DOOR DISASSEMBLY ............................. 10-7
CHAPTER 11. CIRCUIT DIAGRAMS
[1] Figure S-1. Pictorial Diagram.....................11-1
[2] Figure S-2. Switching Power Supply Unit
Circuit.........................................................11-4
[3] Figure S-3. Relay Unit Circuit ....................11-5
[4] Figure S-4. Control Unit/ Antenna sen-
sor/ Microwave Sensor Circuit ...................11-6
[5] Figure S-5. Printed Wiring Board ...............11-7
Parts List