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R-1871TY
SCHEMATIC
NOTE: CONDITION OF OVEN
1. Door Closed
2. CLOCK APPEARS ON DISPLAY
HOOD FAN
THERMAL
CUT OUTS
(CONV SIDE)
H
120VAC
GND
C2
60Hz
R2
C1
N
C3
NOISE
FILTER
CIRCUITS SUBJECT TO CHANGE WITHOUT NOTICE
H
HOOD FAN
THERMAL
CUTOUTS
120VAC
GND
(CONV. SIDE)
NOISE
60Hz
RESISTOR
N
C2
C1
C3
NOISE
FILTER
Circuits / Wire colors subject to change without notice
1. Check AC power into CN101,
if none check Main Harness.
2. Check DC power across CN201 (DC15V),
if none replace Switching Power Supply Unit
3. Check for DC getting from Switching Power
Supply Unit to PSU/ CPU, if none check Main
Harness.
Switching Regulator
#1 (N)
#1 (+)
#2 (-)
MAGNETRON
TEMPERATURE
FUSE
B7
B5
C3
FUSE1
RY9
C9
NOISE
RESISTOR
C5
RY10
C7
HOOD
CAPACITOR
RY8
RY6
RY5
HOOD
A1
A3
C1
A5
D3
D5
MOTOR
HOOD
FM
LAMP
DM
HL
HL
SECONDARY
INTERLOCK
SWITCH
R-1871TY Oven Schematic - Off Condition
MAGNETRON
SECONDARY
TEMPERATURE
FUSE
A5
CONTROL UNIT
C3
FM
DM
C9
RY9
RY10
D5
D3
C5
C7
RY5
RY6
HOOD
RY8
CAPACITOR
C1
A1
A3
HOOD
B7
MOTOR
HOOD
B5
LAMP
HL
HL
B3
B1
#1(N)
#2(-)
#3(L)
#1(+)
SWITCHING
REGULATOR
R-1874TY & R-1875TY Oven Schematic - Off Condition
SWITCHING POWER SUPPLY TEST PROCEDURE
N.O.
N.O.
B3
B1
RY1
RY2
CONTROL UNIT
RY3
RY2
RY4
RY7
RY1
D1
D7
COM
COM
COM
N.O.
E1
E2
E5
RY1
RY2
RY3
RY3
DOOR
SENSING
TTM
SWITCH
THERMISTOR
CM
OL
HEATING
ELEMENT
INTERLOCK
SWITCH
CM
OL
DOOR
TTM
SENSING
THERMISTOR SWITCH
SWITCH
COM.
COM.
COM.
N.O.
E1
E2
E5
E6 E3
D1
D7
RY1
RY2
RY3
RY3
RY4
RY7
RY1
F1
F2
RY2
RY3
AH SENSOR
N.O.
N.O.
RY1
RY2
CN101
3
AH SENSOR
POWER
TRANSFORMER
F3
F1
F2
HIGH
E6
E3
E4
VOLTAGE
CAPACITOR
XXX µF
STM
DAMPER
SWITCH
HIGH
MONITOR
VOLTAGE
SWITCH
RECTIFIER
THIRD DOOR
SWITCH
MONITOR
SWITCH
DAMPER
STM
POWER
TRANSFORMER
E4
F3
HIGH
VOLTAGE
CAPACITOR
HIGH
VOLTAGE
RECTIFIER
R-1874TY
R-1875TY
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