Table Of Contents - Sharp R-426LS Service Manual

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
[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 SCHEMATIC ............................... . .... 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 ASSEM-
BLY 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
OR THERMAL CUT-OUT TEST ............ . .... 8-2
[6] Procedure F: PRIMARY INTERLOCK
SWITCH TEST....................................... . .... 8-2
[7] Procedure F: SECONDARY INTER-
LOCK SYSTEM TEST ........................... . .... 8-3
[8] Procedure G: MONITOR SWITCH TEST ..... 8-3
[9] Procedure H: BLOWN MONITOR FUSE
TEST...................................................... . .... 8-4
[10] Procedure I: NOISE FILTER TEST ........ . .... 8-4
CONTENTS
[11] Procedure J: TOUCH CONTROL PANEL
ASSEMBLY TEST.................................. . .... 8-4
[12] Procedure K: KEY UNIT TEST .............. . .... 8-5
[13] Procedure L: RELAY TEST.................... . .... 8-6
[14] Procedure M: DEFROST TEST ............. . .... 8-6
[15] Procedure N: FOIL PATTERN ON THE
PRINTED WIRING BOARD TEST ......... . .... 8-6
[16] Procedure O: AH SENSOR TEST ......... . .... 8-7
CHAPTER 9. TOUCH CONTROL PANEL ASSEM-
BLY
[1] OUTLINE OF TOUCH CONTROL PAN-
EL .......................................................... . .... 9-1
[2] ABSOLUTE HUMIDITY SENSOR CIR-
CUIT....................................................... . .... 9-1
[3] SERVICING FOR TOUCH CONTROL
PANEL ................................................... . .... 9-2
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] WARNINGS ........................................... . ...11-1
[2] OUTER CASE REMOVAL ..................... . ...11-2
[3] POWER TRANSFORMER REMOVAL .. . ...11-2
[4] HIGH VOLTAGE RECTIFIER AND HIGH
VOLTAGE CAPACITOR REMOVAL....... . ...11-2
[5] MAGNETRON REMOVAL ..................... . ...11-2
[6] OVEN LAMP REMOVAL........................ . ...11-3
[7] POSITIVE LOCK CONNECTOR (NO-
CASE TYPE) REMOVAL ....................... . ...11-3
[8] CONTROL PANEL ASSEMBLY RE-
MOVAL................................................... . ...11-3
[9] GRAPHIC SHEET AND MEMBRANE
SWITCH REPLACEMENT..................... . ...11-3
[10] TURNTABLE MOTOR REMOVAL ......... . ...11-4
[11] COOLING FAN MOTOR REMOVAL...... . ...11-4
[12] DOOR SENSING SWITCH/PRIMARY
INTERLOCK SWITCH AND MONITOR
SWITCH REMOVAL............................... . ...11-5
[13] DOOR SENSING SWITCH/PRIMARY
INTERLOCK SWITCH AND MONITOR
SWITCH ADJUSTMENT........................ . ...11-5
[14] DOOR REPLACEMENT ........................ . ...11-5
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 List