Service manual

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 REMOVA
L .....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
Service_R-890SLM.indd 2 4/25/09 10:54:33 AM