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R-820BK
Sharp R-820BK Service Manual
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R-820BK
R-820BW
'98 SHARP CORP. (5S2.530E) Printed in U.S.A
COPYRIGHT © 1998 BY SHARP CORPORATION
ALL RIGHTS RESERVED.
No part of this publication may be repro-
duced, stored in retrieval systems, or trans-
mitted in any form or by any means, elec-
tronic, mechanical, photocopying, record-
ing, or otherwise, without prior written per-
mission of the publisher.
47
Table of Contents
Table of Contents
1
Precautions to be Observed before and During Servicing to Avoid Possible Exposure to Excessive Microwave Energy
2
Before Servicing
2
After Repairing
3
Warning to Service Personnel
3
Requirements
4
Preparation for Testing
4
Leakage Test
4
Microwave Measurement Procedure
4
Grounding Instructions
6
Specification
6
General Information
6
Oven Diagram
7
Touch Control Panel
7
Description of Operating Sequence
8
Off Condition
8
Microwave Cooking Condition
8
Operating Sequence
8
Top and Bottom Heater Mode
9
Top Heater Mode
9
Convection Time Cooking Condition
9
Convection Cooking Condition with Preheat
9
On/Off Time Ratio
10
Fire Sensing Feature (Microwave Mode)
10
Roast Cooking Condition
10
Oven Schematic-OFF Condition
11
Oven Schematic-Microwave Cooking Condition
11
Oven Schematic-Grill Cooking Condition
12
Description and Function of Components
14
Door Open Mechanism
14
Turntable Motor
14
Cooling Fan Motor
14
Bottom Heater
15
Convection Cooking System
15
Troubleshooting Guide
15
Test Procedure
16
Test Procedures
17
Magnetron Assembly Test
17
Microwave Output Power
17
Power Transformer Test
17
High Voltage Rectifier Test
18
High Voltage Capacitor Test
18
Thermal Cut-Out Test 170˚C (Oven)
18
Secondary Interlock Switch Test
19
Primary Interlock System Test
19
Door Sensing Switch
19
Primary Interlock Relay (Ry2)
19
Insulation Resistance
20
Resistance of Heater
20
Top Heaters and Bottom Heater Test
20
Blown Monitor Fuse Test
20
Thermistor Test
21
Checking Temperature in the Convection Mode
21
Touch Control Panel Assembly Test
21
Key Unit Test
22
Relay Test
23
Compu Defrost Test
24
Foil Pattern on the Printed Wiring Board Test
24
Outline of Touch Control Panel
26
Description of Lsi
27
Servicing of Touch Control Panel
31
Precautions for Handling Electronic Components
31
Shapes of Electronic Components
31
Servicing
31
Warning against High Voltage
32
Warning for Wiring
32
Outer Case Removal
32
Component Replacement and Adjustment Procedure
32
Power Transformer Removal
33
High Voltage Rectifier Assembly and High Voltage Capacitor Removal
33
Magnetron Removal
33
Control Panel Assembly Removal
33
Turntable Motor Removal
34
Connector (No-Case Type) Removal
34
Oven Lamp and Lamp Socket Removal
34
Cooling Fan Motor Removal
35
Convection Motor Removal
35
Thermistor Removal
36
Power Supply Cord Replacement
36
Gril Heater (Top Heater) Removal
36
Bottom Heater Removal
36
Pictorial Diagram
36
Door Replacement
37
Latch Switch Adjustments
37
Door Disassembly
37
Control Panel Parts
43
Electric Parts
43
Cabinet Parts
43
Power Unit Circuit
43
Cpu Unit Circuit
43
Parts List
43
Oven Parts
44
Door Parts
44
Miscellaneous
44
Screws,Nuts and Washers
45
How to Order Replacement Parts
45
Packing and Accessories
45
Oven and Cabinet Parts
46
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Sharp R-820BK Specifications
General
Brand
Sharp
Model
R-820BK
Category
Microwave Oven
Language
English
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