Sharp R-220KK, Service Manual

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CONTENTS
PRECAUTIONS TO BE OBSERVED BEFORE AND
DURING SERVICING TO AVOID POSSIBLE EXPO-
SURE TO EXCESSIVE MICROWAVE ENERGY
BEFORE SERVICING
CHAPTER 1. WARNING TO SERVICE PERSONNEL
[1] Before Servicing .........................................1-1
[2] When the testing is completed, ..................1-1
[3] After
repairing .............................................1-1
CHAPTER 2. MICROWAVE MEASUREMENT PRO-
CEDURE
[1] Requirements: ............................................2-1
[2] Preparation
for testing: ...............................2-1
[3] Leakage test: ..............................................2-1
CHAPTER 3. FOREWORD AND WARNING
[1] FOREWORD ..............................................3-1
[2] WARNING ..................................................3-1
[3] DANGER ....................................................3-1
CHAPTER 4. PRODUCT DESCRIPTION
[1] SPECIFICATIONS ......................................4-1
CHAPTER 5. GENERAL INFORMATION
[1] GROUNDING INSTRUCTIONS .................5-1
[2] OVEN DIAGRAM........................................5-1
CHAPTER 6. OPERATION
[1] DESCRIPTION OF OPERATING SE-
QUENCE ...................................................6-1
[2] OVEN SCHENATIC ....................................6-2
[3] DESCRIPTION AND FUNCTION OF
COMPONENTS..........................................6-3
CHAPTER 7. TROUBLESHOOTING GUIDE
[1] TROUBLESHOOTING CHART .................7-1
CHAPTER 8. TEST PROCEDURES
[1] Procedure A: MAGNETRON ASSEMBLY
TEST ..........................................................8-1
[2] Procedure B: POWER TRANSFORMER
TEST ..........................................................8-1
[3] Procedure C: HIGH VOLTAGE RECTIFI-
ER TEST ....................................................8-1
[4] Procedure D: HIGH VOLTAGE CAPACI-
TOR TEST ..................................................8-2
[5] Procedure E: TEMPERATURE FUSE
(OVEN) TEST .............................................8-2
[6] Procedure E: THERMAL CUT-OUT (OV-
EN ) TEST ..................................................8-2
[7] Procedure F: SECONDARY INTERLOCK
SWITCH TEST ...........................................8-2
[8] Procedure F: PRIMARY INTERLOCK
SYSTEM TEST...........................................8-3
[9] Procedure G: MONITOR SWITCH TEST.....8-3
[10] Procedure H: BLOWN MINITOR FUSE
TEST ..........................................................8-4
[11] Procedure I: NOISE FILTER TEST............. 8-4
[12] Procedure J: TOUCH CONTROL PANEL
ASSEMBLY TEST....................................... 8-4
[13] Procedure K: KEY UNIT TEST ................... 8-5
[14] Procedure L: RELAY TEST......................... 8-6
[15] Procedure M: DEFROST TEST .................. 8-6
[16] Procedure N: FOIL PATTERN ON THE
PRINTED WIRING BOARD TEST.............. 8-6
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
[1] Employing lead-free solder ....................... 10-1
[2] Using lead-free wire solder ....................... 10-1
[3] Soldering................................................... 10-1
CHAPTER 11. COMPONENT REPLACEMENT AND
ADJUSTMENT PROCEDURE
[1] WARNING..................................................11-1
[2] OUTER CASE REMOVAL .........................11-2
[3] MAGNETRON
REMOVAL .........................11-2
[4] HIGH VOLTAGE COMPONENTS RE-
MOVAL (HIGH VOLTAGE CAPACITOR
AND HIGH VOLTAGE RECTIFIER AS-
SEMBLY) ...................................................11-2
[5] POWER TRANSFORMER REMOVAL ......11-2
[6] POSITIVE LOCK CONNECTOR (NO-
CASE TYPE) REMOVAL ...........................11-3
[7] CONTROL PANEL ASSEMBLY REMOV-
AL ..............................................................11-3
[8] GRAPHIC SHEET AND MEMBRANE
SWITCH REPLACEMENT.........................11-3
[9] POWER SUPPLY CORD REPLACE-
MENT.........................................................11-4
[10] TURNTABLE MOTOR REMOVAL .............11-4
[11] COOLING FAN MOTOR REMOVAL..........11-4
[12] DOOR SENSING SWITCH/SECONDARY
INTERLOCK SWITCH AND MONITOR
SWITCH REMOVAL ..................................11-5
[13] DOOR SENSING SWITCH/SECONDARY
INTERLOCK SWITCH AND MONITOR
SWITCH ADJUSTMENT ...........................11-5
[14] DOOR REPLACEMENT ............................11-6
CHAPTER 12. CIRCUIT DIAGRAMS
[1] Pictorial Diagram (Figure S-1) .................. 12-1
[2] Control Panel Circuit (Figure S-2)............. 12-2
[3] Printed Wiring Board (Figure S-3) ............ 12-3
Parts Guide