Sharp R-231NW - Table of Contents

PRECAUTIONS TO BE OBSERVED BEFORE
AND DURING SERVICING TO AVOID EXPOSURE
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
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 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] A: MAGNETRON ASSEMBLY TEST... ........8-1
[2] B: POWER TRANSFORMER TEST ............8-1
[3] C: HIGH VOLTAGE RECTIFIER TEST .......8-1
[4] D: HIGH VOLTAGE CAPACITOR TEST ......8-2
[5] E: THERMAL CUT-OUT (OVEN ) TEST ......8-2
[6] E: TEMPERATURE FUSE (OVEN)
TEST ...........................................................8-2
[7] F: SECONDARY INTERLOCK SWITCH
TEST ...........................................................8-2
[8] F: PRIMARY INTERLOCK SYSTEM
TEST ...........................................................8-3
[9] G: MOTOR SWITCH TEST .........................8-3
[10] H: BLOWN MINITOR FUSE TEST ..............8-4
[11] I: NOISE FILTER TEST ...............................8-4
[12] J: TOUCH CONTROL PANEL ASSEMBLY
TEST ...........................................................8-4
CONTENTS
[13] K: KEY UNIT TEST ..................................... 8-5
[14] L: RELAY TEST .......................................... 8-6
[15] M: DEFROST TEST ................................... 8-6
[16] N: FOIL PATTERN ON THE PRINTED
WIRING BOARD TEST .............................. 8-6
CHAPTER 9. TOUCH CONTROL UNIT ASSEMBLY
[1] OUTLINE OF TOUCH CONTROL UNIT ....... 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 REMOVAL
(HIGH VOLTAGE CAPACITOR AND HIGH
VOLTAGE RECTIFIER ASSEMBLY) ...........11-2
[5] POWER TRANSFORMER REMOVAL ........11-2
[6] POSITIVE LOCK CONNECTOR (NO-
CASE TYPE) REMOVAL .............................11-3
[7]
CONTROL PANEL ASSEMBLY REMOVAL ..11-3
[8] GRAPHIC SHEET AND MEMBRANE
SWITCH REPLACEMENT ..........................11-3
[9] POWER SUPPLY CORD REPLACEMENT ...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
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