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Microwave Oven
R-1900J
Sharp R-1900J Service Manual
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R1900J
11
–
6
[3] Figure S-2. Switching
Power Supply Unit Circuit
4,5
Output
Input
R27
R26
IC21
C23
R23
PC1A
2
1
R24
R25
C22
+
R21
L21
ZD21
C13
CN21
2
1
C24
F21
D7
R1
1
C7
C9
+
C10
+
C8
PC1B
4
3
R7
R22
C21
T1
12
2
10
8
7
4
3
FB1
D6
R6
C6
R3
R4
R5
C5
+
C1
CN1
3
2
1
C14
C1
1
C12
R1
R2
TH1
R10
D5
IC1
5
3
2
1
4
6
8
7
NC
DRV
CS
FB
ADJ
VCC
HV
GND
VZ3
D21
D8
L1
D1
R9
D2
D4
D3
Q1
R8
ZD2
VZ1
ZD1
F1
12
VZ2
CD1
40
42
Table of Contents
Default Chapter
1
Microwave Oven
1
Table of Contents
2
Chapter 1. Before Servicing
3
Chapter 2. Warning to Service Personnel
4
Chapter 3. Product Description
5
Specifications
5
Appearance View
5
Installation Information
6
Chapter 4. Operation
7
Description of Operating Sequence
7
Description and Function of Components
8
Chapter 5. Troubleshooting Guide
10
Test Procedures
11
Chapter 6. Test Procedures A: Magnetron Test
12
B: Power Transformer Test
13
C: High Voltage Rectifier (1) And/Or (2) Test
13
D: High Voltage Capacitor (1) And/Or (2) Test
14
E: Secondary Interlock Switch (1) And/Or (2) Test
14
F: Primary Interlock System Test
14
G: Monitor Switch (1) And/Or (2) Test
14
I: Weak Point
15
J: Weak Point (in Noise Filter) Test
15
K: Temperature Fuse Test
15
L: Magnetron Thermistor Test
15
M: Exhaust Thermistor Test
15
N: Noise Filter Test
16
O: Key Unit Test
16
P: Control Unit Test
17
Q: Power Unit Test
17
R: Relay Unit Test
17
S: Antenna Sensor Test
18
T: Microwave Sensor Test
18
CHAPTER 7 . TOUCH CONTROL PANEL ASSEM- [3] Figure S-2. Switching Power Supply Unit
19
Special Function for Servicing
19
Touch Control Panel Assembly
19
Servicing for Brinted Wiring Boards
25
Chapter 8. Precautions for Using Lead-Free Solder
26
Chapter 9. Component Replacement and Adjustment Procedure Warnings
27
Adjustment Procedure 1] Warnings
27
Outer Case and Rear Cover Removal
27
Power Transformers (1) And/Or (2) Removal
28
Magnetrons (1) And/Or (2) Removal
28
Magnetron Thermistor Assembly Replacement
28
High Voltage Capacitor and High Voltage Rectifier Assembly Removal
28
Power Supply Cord Replacement
29
How to Release the Positive Lock Connector
29
Exhaust Fan Removal
29
Fan Motors Removal
30
Antenna Motors (Upper and Lower) Removal
30
Power Unit Removal
30
Control Panel Assembly and Control Unit Removal
30
Relay Unit Removal
30
Door Sensing Switch/ Secondary Interlock Switches (1), (2) and Monitor Switches (1), (2) Replacement
31
Door Sensing Switch/ Secondary Interlock Switches (1), (2) and Monitor Switches (1), (2) Adjustment
31
Door Replacement
31
Door Disassembly
32
Oven Lamp and Lamp Socket Removal
34
Chapter 10. Microwave Measurement
35
Oven Schematic
36
Circuit Diagrams
36
CHAPTER 11. CIRCUIT DIAGRAMS 1] Oven Schematic
36
Figure S-2. Switching Power Supply Unit Circuit
41
Figure S-3. Relay Unit Circuit
42
Sor/ Microwave Sensor Circuit
43
Figure S-5. Printed Wiring Board
44
Parts List
45
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Sharp R-1900J Specifications
General
Brand
Sharp
Model
R-1900J
Category
Microwave Oven
Language
English
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