9
R-200BK
R-200BW
CK = Check / RE = Replace
RE CK
A B
C D E
F
F G H
RE RE CK
I/J
CK CK CK K
SHORT IN POWER CORD
SHORT OR OPEN WIRING
MAGNETRON
POWER TRANSFORMER
H.V. RECTIFIER ASSEMBLY
HIGH VOLTAGE CAPACITOR
MAGNETRON THERMAL CUT-OUT
PRIMARY INTERLOCK SYSTEM
SECONDARY INTERLOCK SWITCH
MONITOR SWITCH
C/T FUSE
OVEN LAMP OR SOCKET
COOLING FAN MOTOR
TURNTABLE MOTOR
CONTROL UNIT OR RELAY
WRONG OPERATION
LOW VOLTAGE
DIRTY OVEN CAVITY
FOIL PATTERN ON PWB.
Home fuse blows when power cord is
plugged into wall receptacle.
C/T fuse blows when power cord is
plugged into wall receptacle.
C/T fuse blows when the door is opened.
Fan motor does not operate. (All other
electric components function.)
Oven lamp does not light at all. (All other
electric components function.)
Turntable motor does not operate. (All other
electric components function.)
Oven does not go into cook cycle when
Light Up Dial is turned
Oven seems to be operating but little or
no heat is produced in oven load. (Food
incompletely cooked or not cooked at all
at end of cook cycle.)
Oven goes into a cook cycle but ex-
tremely uneven heating is produced in
oven load (food).
Oven lamp, turntable motor and fan mo-
tor do not operate.
TEST PROCEDURE
PROBLEM
CONDITION
OFF
CONDITION
COOKING
CONDITION
POSSIBLE CAUSE
AND
DEFECTIVE PARTS
A
MAGNETRON ASSEMBLY TEST
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge high voltage capacitor.
4. To test for an open filament, isolate the magnetron from the high voltage circuit. A continuity check
across the magnetron filament leads should indicate less than 1 ohm.
5. To test for a shorted magnetron, connect the ohmmeter leads between the magnetron filament leads
and chassis ground. This test should indicate an infinite resistance. If there is little or no resistance
the magnetron is grounded and must be replaced.
6. Reconnect all leads removed from components during testing.
7. Reinstall the outer case (cabinet).
8. Reconnect the power supply cord after the outer case is installed.
9. Run the oven and check all functions.
MICROWAVE OUTPUT POWER
The following test procedure should be carried out with the microwave oven in a fully assembled
condition (outer case fitted).
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
