R1900J
11 – 1
R1900J
Service Manual
CHAPTER 11.
CIRCUIT DIAGRAMS
[1] Oven Schematic
Figure O-1a Oven Schematic-OFF condition right after the oven is plugged in.
Figure O-1b Oven Schematic-OFF condition when the oven door is opened.
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED.
2. PLUGGED IN OVEN.
3. NOTHING APPEAR ON DISPLAY.
SCHEMATIC
NOTE: CONDITION OF OVEN
4. DOOR OPENED.
5. “0” APPEAR ON DISPLAY.
NEUTRAL
N
WEAK POINT (1)
WEAK POINT (2)
COOK
RELAY (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 MOT
O
R
(1)
ANTENNA MOT
O
R
(2)
ANT.
SENSOR (2)
MICROWAVE
SENSOR
SECONDARY INTERLOCK
SWITCH (1)
SECONDARY INTERLOCK
SWITCH (2)
EXHAUST
MOTOR
(DC24V)
POWER
TRANSFORMER (1)
POWER
TRANSFORMER (2)
H. V.
CAPACITOR (1)
CT1
H. V.
ASYMMETRIC
RECTIFIER (1)
H. V.
RECTIFIER (1)
MAGNETRON
(1)
H. V.
CAPACITOR (2)
CAPACITOR: 1uF
H. V.
ASYMMETRIC
RECTIFIER (2)
H. V.
RECTIFIER (2)
MAGNETRON
(2)
MONIT
OR
SWITCH
(2)
MONIT
OR
SWITCH
(1)
COOK
RELAY (2)
OVEN
TEMP.
FUSE
PRIMARY
INTERLOCK
RELAY
DOOR
SENSING
SWITCH
RELAY 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
RELAY (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 MOT
O
R
(1)
ANTENNA MOT
O
R
(2)
ANT.
SENSOR (2)
MICROWAVE
SENSOR
SECONDARY INTERLOCK
SWITCH (1)
SECONDARY INTERLOCK
SWITCH (2)
EXHAUST
MOTOR
(DC24V)
POWER
TRANSFORMER (1)
POWER
TRANSFORMER (2)
H. V.
CAPACITOR (1)
CT1
H. V.
ASYMMETRIC
RECTIFIER (1)
H. V.
RECTIFIER (1)
MAGNETRON
(1)
H. V.
CAPACITOR (2)
CAPACITOR: 1uF
H. V.
ASYMMETRIC
RECTIFIER (2)
H. V.
RECTIFIER (2)
MAGNETRON
(2)
MONIT
OR
SWITCH
(2)
MONIT
OR
SWITCH
(1)
COOK
RELAY (2)
OVEN
TEMP.
FUSE
PRIMARY
INTERLOCK
RELAY
DOOR
SENSING
SWITCH
RELAY 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)