R-890SLM - Sharp Home Appliance Service Manual (repair manual). Page 2

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CHAPTER 1. BEFORE SERVICING
CHAPTER 2. WARNING TO SERVICE PERSONNEL
CHAPTER 3. PRODUCT SPECIFICATIONS
[1]   SPECIFICATION .........................................3-1
CHAPTER 4. APPEARANCE VIEW
CHAPTER 5. OPERATION SEQUENCE
[1]   OFF CONDITION ........................................5-1
[2]   MICROWAVE COOKING CONDITION .......5-1
[3]   GRILL COOKING CONDITION ...................5-2
[4]   CONVECTION COOKING CONDITION .....5-2
[5]   COMBI COOKING CONDITION ..................5-2
[6]   ON/OFF TIME RATIO ..................................5-3
[7]   AUTO POWER CONTROL OPERATION ....5-3
CHAPTER 6. FUNCTION OF IMPORTANT COM-
PONENTS
[1]   DOOR OPEN MECHANISM ........................6-1
[2]   SWITCH ......................................................6-1
[3]   FUSE ...........................................................6-1
[4]   TC TRANSFORMER ...................................6-1
[5]   THERMAL CUT-OUT ...................................6-1
[6]   ASYMMETRIC RECTIFIER .........................6-1
[7]   NOISE FILTER ............................................6-2
[8]   MOTOR .......................................................6-2
[9]   HEATING ELEMENT ...................................6-2
[10]  CONVECTION COOKING SYSTEM ...........6-2
[11]  FIRE SENSING FEATURE ..........................6-2
[12]  OPEN JUDGE BY THERMISTOR ...............6-2
CHAPTER 7. TROUBLESHOOTING GUIDE
CHAPTER 8. TEST PROCEDURES
[1]   A: MAGNETRON TEST ...............................8-1
[2]   B: HIGH VOLTAGE TRANSFORMER
 
TEST ...........................................................8-1
[3]   C: HIGH VOLTAGE RECTIFIER TEST .......8-2
[4]   D: HIGH VOLTAGE CAPACITOR TEST ......8-2
[5]   E: SWITCH TEST ........................................8-2
[6]   F: THERMISTOR TEST ...............................8-2
[7]   G: THERMAL CUT-OUT TEST ....................8-3
[8]   H: MOTOR WINDING TEST. .......................8-3
[9]   I: NOISE FILTER TEST ...............................8-3
[10]  J: BLOWN FUSE (F1) 20A ..........................8-3
[11]  K: BLOWN FUSE F8A .................................8-3
[12]  L: GRILL HEATING ELEMENTS (TOP)
 
AND BOTTOM HEATING ELEMENT
 
TEST ...........................................................8-4
[13]  M: CONTROL PANEL ASSEMBLY TEST ....8-4
[14]  N: JOG SWITCH UNIT TEST ......................8-4
CONTENTS
[15]  O: RELAY TEST ..........................................8-5
[16]  P: PROCEDURES TO BE TAKEN
 
WHEN THE FOIL PATTERN ON THE
 
PRINTED WIRING BOARD (PWB) IS
 
OPEN ..........................................................8-5
CHAPTER 9. CONTROL PANEL ASSEMBLY
[1]   OUTLINE OF CONTROL PANEL ................9-1
[2]   SERVICING FOR CONTROL PANEL .........9-2
CHAPTER 10. PRECAUTIONS FOR USING LEAD-
FREE SOLDER
CHAPTER 11. COMPONENT REPLACEMENT AND 
ADJUSTMENT PROCEDURE
[1]   BEFORE OPERATING ................................11-1
[2]   OUTER CASE CABINET REMOVAL ..........11-1
[3]   HIGH VOLTAGE COMPONENTS 
 
REMOVAL ...................................................11-2
[4]   HIGH VOLTAGE TRANSFORMER 
 
REMOVAL ...................................................11-2
[5]   MAGNETRON REMOVAL ...........................11-2
[6]   FAN MOTOR REPLACEMENT ...................11-2
[7]   TURNTABLE MOTOR REPLACEMENT .....11-3
[8]   CONVECTION FAN MOTOR REMOVAL ....11-3
[9]   POSITIVE LOCK CONNECTOR 
 
REMOVAL ...................................................11-4
[10]  OVEN LAMP REMOVAL .............................11-4
[11]  POWER SUPPLY CORD REPLACE-
 
MENT ..........................................................11-4
[12]  TOP HEATING ELEMENTS REMOVAL ......11-4
[13]  BOTTOM HEATING ELEMENTS 
 
REMOVAL ...................................................11-5
[14]  CONTROL PANEL ASSEMBLY REMOVAL ....11-5
[15]  MONITORED LATCH SWITCH, MONITOR
 
SWITCH AND STOP SWITCH REMOVAL .....11-5
[16]  MONITORED LATCH SWITCH, STOP SWITCH
 
AND MONITOR SWITCH ADJUSTMENT ......11-5
[17]  DOOR REPLACEMENT ..............................11-6
CHAPTER 12. MICROWAVE MEASUREMENT
CHAPTER 13. CIRCUIT DIAGRAMS
[1]   Oven Schematic ..........................................13-1
[2]   Pictorial Diagram (Figure S-1) .....................13-6
[3]   Control Unit Circuit ......................................13-7
[4]   Printed Wiring Board of Control Unit ...........13-8
[5]   Printed Wiring Board of Power Unit .............13-9
[6]   Printed Wiring Board of Switch Unit ............13-10
Parts List
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