Oven Schematic; Test Procedure - Sharp R-630DKA Service Manual

SCHEMATIC
NOTE: CONDITION OF OVEN
1. DOOR CLOSED
2. CLOCK APPEARS ON DISPLAY
120V AC
60 Hz
PROCEDURE
LETTER
B POWER TRANSFORMER 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.)
THERMAL
MONITOR THERMAL
CUT-OUT (OVEN)
FUSE 20A CUT-OUT (MG.)
A2
(RY-1)
A1
CONTROL UNIT
COM.
GRN
OVEN TTM
OL FM
LAMP
TURN-
TABLE
MOTOR
SECONDARY
INTERLOCK
SWITCH
Figure O-1. Oven Schematic-Off Condition
TEST PROCEDURES
COMPONENT TEST
5
N.O.
N.O.
(RY-2)
PRIMARY
INTERLOCK
RELAY
COM.
B2 B1
DOOR
SENSING
MONITOR
SWITCH
SWITCH
FAN
MOTOR
R- 630DKA
R- 630DSA
R-630DWA
POWER
TRANSFORMER
RECTIFIER
MAGNETRON