5
R- 630DKA
R- 630DSA
R-630DWA
Figure O-1. Oven Schematic-Off Condition
SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
120V AC
60 Hz
OVEN
LAMP
TURN-
TABLE
MOTOR
FAN
MOTOR
POWER
TRANSFORMER
MONITOR
SWITCH
RECTIFIER
MAGNETRON
SECONDARY
INTERLOCK
SWITCH
TTM
OL
FM
MONITOR
FUSE 20A
A1
A2
N.O.
COM.
COM.
N.O.
DOOR
SENSING
SWITCH
(RY-1)
(RY-2)
CONTROL UNIT
PRIMARY
INTERLOCK
RELAY
THERMAL
CUT-OUT (OVEN)
THERMAL
CUT-OUT (MG.)
GRN
F3
F1
F2
AH SENSOR
B2
B1
CAPACITOR 0.94
µ
F
AC 2200V
B
POWER TRANSFORMER TEST
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge the high voltage capacitor.
4. Disconnect the primary input terminals and measure the resistance of the transformer with an
ohmmeter. Check for continuity of the coils with an ohmmeter. On the R x 1 scale, the resistance of
the primary coil should be less than 1 ohm and the resistance of the high voltage coil should be
approximately 77 ohms; the resistance of the filament coil should be less than 1 ohm.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
(HIGH VOLTAGES ARE PRESENT AT THE HIGH VOLTAGE TERMINAL, SO DO NOT ATTEMPT TO
MEASURE THE FILAMENT AND HIGH VOLTAGE.)
