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R-1900J
Sharp R-1900J Service Manual
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R1900J
11
–
1
R1900J
ServiceManual
CHAPTER 1
1.
CIRCUIT DIAGRAMS
[1] Oven Schematic
Figure O-1a Oven Schematic-O
FF
condition right after the oven is plugged in.
Figure O-1b Oven Schematic-OFF condition when the oven doo
r is opened.
SCHEMA
TIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. PLUGGED IN OVEN.
3. NOTHING APPEAR ON DISPLA
Y
.
SCHEMA
TIC
NOTE: CONDITION OF OVEN
4. DOOR OPENED.
5. “0” APPEAR ON DISPLA
Y
.
NEUTRAL
N
WEAK
POINT
(1)
WEAK
POINT
(2)
COOK
RELA
Y
(1)
MAGNETRON
TEMP
.
FUSE
(1)
MAGNETRON
TEMP
.
FUSE
(2)
MAGNETRON
THERMISTOR
(1)
MAGNETRON
THERMISTOR
(2)
EXHAUST
THERMISTOR
ANT
.
SENSOR
(1)
3A
FUSE
T1
RY1
RY4
D1
F1
F3
F4
H3
H2
H1
G7
G6
G4
G3
G2
G1
G5
F6
F8
F10
F26
F24
F22
F5
F7
F9
F11
F13
F15
F17
F19
F21
F23
F25
F12
(WEAK
POINT)
(WEAK
POINT)
F14
F18
F16
F20
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
E1
A3
A5
A1
C3
C1
E2
OVEN
LAMP
ANTENNA
MOTOR
(1)
ANTENNA
MOTOR
(2)
ANT
.
SENSOR
(2)
MICROWA
VE
SENSOR
SECONDARY
INTERLOCK
SWITCH
(1)
SECONDARY
INTERLOCK
SWITCH
(2)
EXHAUST
MOTOR
(DC24V)
POWER
TRANSFORMER
(1)
POWER
TRANSFORMER
(2)
H.
V
.
CAP
ACITOR
(1)
CT1
H.
V
.
ASYMMETRIC
RECTIFIER
(1)
H.
V
.
RECTIFIER
(1)
MAGNETRON
(1)
H.
V
.
CAP
ACITOR
(2)
CAP
ACITOR:
1uF
H.
V
.
ASYMMETRIC
RECTIFIER
(2)
H.
V
.
RECTIFIER
(2)
MAGNETRON
(2)
MONITOR
SWITCH
(2)
MONITOR
SWITCH
(1)
COOK
RELA
Y
(2)
OVEN
TEMP
.
FUSE
PRIMARY
INTERLOCK
RELA
Y
DOOR
SENSING
SWITCH
RELA
Y
UNIT
CONTROL
UNIT
EM
EF
FM
FM
OL
AM
AM
RY2
RY3
AC
230
-240V
50Hz
LINE
L
GRN
(WEAK
POINT)
SWITCHING
POWER
SUPPL
Y
UNIT
Noise
Filter
FAN
MOTOR
(DC24V)
EXHAUST
FAN
(DC24V)
FA
F
FA
F
NEUTRAL
N
COOK
RELA
Y
(1)
MAGNETRON
TEMP
.
FUSE
(1)
MAGNETRON
TEMP
.
FUSE
(2)
MAGNETRON
THERMISTOR
(1)
MAGNETRON
THERMISTOR
(2)
EXHAUST
THERMISTOR
ANT
.
SENSOR
(1)
3A
FUSE
T1
RY1
RY4
D1
F1
F3
F4
H3
H2
H1
G7
G6
G4
G3
G2
G1
G5
F6
F8
F10
F26
F24
F22
F5
F7
F9
F11
F13
F15
F17
F19
F21
F23
F25
F12
F14
F18
F16
F20
D2
D3
D4
D5
D6
D7
D8
D9
D10
D11
D12
D13
E1
A3
A5
A1
C3
C1
E2
OVEN
LAMP
ANTENNA
MOTOR
(1)
ANTENNA
MOTOR
(2)
ANT
.
SENSOR
(2)
MICROWA
VE
SENSOR
SECONDARY
INTERLOCK
SWITCH
(1)
SECONDARY
INTERLOCK
SWITCH
(2)
EXHAUST
MOTOR
(DC24V)
POWER
TRANSFORMER
(1)
POWER
TRANSFORMER
(2)
H.
V
.
CAP
ACITOR
(1)
CT1
H.
V
.
ASYMMETRIC
RECTIFIER
(1)
H.
V
.
RECTIFIER
(1)
MAGNETRON
(1)
H.
V
.
CAP
ACITOR
(2)
CAP
ACITOR:
1uF
H.
V
.
ASYMMETRIC
RECTIFIER
(2)
H.
V
.
RECTIFIER
(2)
MAGNETRON
(2)
MONITOR
SWITCH
(2)
MONITOR
SWITCH
(1)
COOK
RELA
Y
(2)
OVEN
TEMP
.
FUSE
PRIMARY
INTERLOCK
RELA
Y
DOOR
SENSING
SWITCH
RELA
Y
UNIT
CONTROL
UNIT
EM
EF
FM
FM
OL
AM
AM
RY2
RY3
AC
230
-240V
50Hz
LINE
L
GRN
(WEAK
POINT)
SWITCHING
POWER
SUPPL
Y
UNIT
Noise
Filter
FAN
MOTOR
(DC24V)
EXHAUST
FAN
(DC24V)
FA
F
FA
F
WEAK
POINT
(1)
WEAK
POINT
(2)
(WEAK
POINT)
(WEAK
POINT)
35
37
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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