Sharp R-239

CONTENTS
CHAPTER 1. BEFORE SERVICING
[1] GENERAL IMPORTANT INFORMATION.....1-1
[2] WARNING ..................................................1-1
[3] CAUTION MICROWAVE RADIATION ........1-2
CHAPTER 2. WARNING TO SERVICE PERSONNEL
CHAPTER 3. PRODUCT SPECIFICATIONS
CHAPTER 4. APPEARANCE VIEW
[1] OVEN .........................................................4-1
[2] TOUCH CONTROL PANEL........................4-1
CHAPTER 5. OPERATION SEQUENCE
[1] OFF CONDITION .......................................5-1
[2] MICROWAVE COOKING CONDITION ......5-1
[3] POWER OUTPUT REDUCTION................5-1
CHAPTER 6. FUNCTION OF IMPORTANT COMPO-
NENTS
[1] DOOR OPEN MECHANISM.......................6-1
[2] 1ST. LATCH SWITCH (SW1) AND 2ND.
INTERLOCK RELAY CONTROL SWITCH
(SW3) .........................................................6-1
[3] MONITOR SWITCH (SW2) ........................6-1
[4] FUSE (F1) T6.3A........................................6-1
[5] HIGH VOLTAGE FUSE (F2) .......................6-1
[6] TEMPERATURE FUSE (TF) 150C (OV-
EN) .............................................................6-1
[7] TURNTABLE MOTOR (TTM) .....................6-1
[8] FAN MOTOR (FM)......................................6-1
[9] NOISE FILTER ...........................................6-1
CHAPTER 7. TROUBLESHOOTING GUIDE
[1] FOREWORD ..............................................7-1
[2] CHART .......................................................7-1
CHAPTER 8. TEST PROCEDURES
[1] Procedure A : MAGNETRON (MG) TEST.....8-1
[2] Procedure B: HIGH VOLTAGE TRANS-
FORMER (T) TEST ....................................8-2
[3] Procedure C: HIGH VOLTAGE RECTIFI-
ER TEST ....................................................8-2
[4] Procedure D: HIGH VOLTAGE CAPACI-
TOR (C) TEST............................................8-2
[5] Procedure E: SWITCH (SW, SW2, SW3)
TEST ..........................................................8-3
[6] Procedure F: TEMPERATURE FUSE (TF)
TEST ..........................................................8-3
[7] Procedure G: MOTOR WINDING TEST.....8-3
[8] Procedure H: FUSE (F1) T6.3A..................8-3
[9] Procedure I: NOISE FILTER TEST.............8-3
[10] Procedure J: HIGH VOLTAGE FUSE (F2)
TEST ..........................................................8-4
[11] Procedure K: TOUCH CONTROL PANEL
ASSEMBLY TEST ......................................8-4
[12] Procedure L: SWITCH UNIT TEST ............ 8-4
[13] Procedure M: RELAY RY1, RY2) TEST..... 8-5
[14] Procedure N: PROCEDURES TO BE TAK-
EN WHEN THE FOIL PATTERN ON THE
PRINTED WIRING BOARD (PWB) IS
OPEN.......................................................... 8-5
CHAPTER 9. TOUCH CONTROL PANEL ASSEM-
BLY
[1] OUTLINE OF TOUCH CONTROL PANEL ..... 9-1
[2] DESCRIPTION OF LSI ............................... 9-1
[3] SERVICING FOR TOUCH CONTROL
PANEL ........................................................ 9-3
CHAPTER 10. PRECAUTIONS FOR USING LEAD-
FREE SOLDER
CHAPTER 11. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
[1] BEFORE OPERATING ..............................11-1
[2] OUTER CASE REMOVAL .........................11-1
[3] HIGH VOLTAGE TRANSFORMER RE-
MOVAL ......................................................11-1
[4] HIGH VOLTAGE RECTIFIER, HIGH
VOLTAGE FUSE AND HIGH VOLTAGE
CAPACITOR REMOVAL............................11-2
[5] MAGNETRON REMOVAL .........................11-2
[6] POSITIVE LOCK CONNECTOR (NO-
CASE TYPE) REMOVAL ...........................11-2
[7] TURNTABLE MOTOR REMOVAL .............11-2
[8] COOLING FAN MOTOR REMOVAL..........11-3
[9] POWER SUPPLY CORD REPLACE-
MENT.........................................................11-3
[10] CONTROL PANEL ASSEMBLY REMOV-
AL ..............................................................11-4
[11] 1ST. LATCH SWITCH, 2ND. INTERLOCK
RELAY CONTROL SWITCH AND MONI-
TOR SWITCH ADJUSTMENT ...................11-4
[12] 1ST. LATCH SWITCH, 2ND. INTERLOCK
RELAY CONTROL SWITCH AND MONI-
TOR SWITCH ADJUSTMENT ...................11-4
[13] DOOR REPLACEMENT ............................11-5
CHAPTER 12. MICROWAVE MEASUREMENT
CHAPTER 13. TEST DATA AT A GLANCE
CHAPTER 14. CIRCUIT DIAGRAMS
[1] Oven Schematic ....................................... 14-1
[2] Pictorial Diagram (Figure S-1) .................. 14-2
[3] Control Unit Circuit (Figure S-2) ............
... 14-3
[4] Printed Wiring Board ................................ 14-4
Parts Guide