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R - 5 0 1 F K
R-501FW
PROCEDURE
LETTER
8
P OP C OR N
K
RELAY 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. Disconnect the leads to the primary of the power transformer.
5. Ensure that these leads remain isolated from other components and oven chassis by using insulation
tape.
6. After that procedure, re-connect the power supply cord.
7. Remove the outer case and check voltage between the normal open terminal of the relay RY1 and the
normal open terminal of the relay RY2 on the control unit with an A.C. voltmeter.The meter should
indicate 120 volts, if not check oven circuit.
RY1 and RY2 Relay Test
These relays are operated by D.C. voltage
Check voltage at the relay coil with a D.C. voltmeter during the microwave cooking operation.
DC. voltage indicated ............. Defective relay.
DC. voltage not indicated ........ Check diode which is connected to the relay coil. If diode is good,
RELAY SYMBOL
RY1
RY2
8. Disconnect the power supply cord, and then remove outer case.
9. Open the door and block it open.
10. Discharge high voltage capacitor.
11. Reconnect all leads removed from components during testing.
12. Re-install the outer case (cabinet).
13. Reconnect the power supply cord after the outer case is installed.
14. Run the oven and check all functions.
L
COMPU DEFROST TEST
WARNING : The oven should be fully assembled before following procedure.
(1) Place one cup of water in the center of the turntable tray in the oven cavity.
(2) Close the door, touch the " DEFROST " pad once.
(3) Touch the number pad "2" and then touch the number pad "5".
(4) Touch the start pad.
(5) The oven is in Compu Defrost cooking condition.
(6) The oven will operate as follows. (in case of Steak/Chops 0.5lb)
(7) If improper operation is indicated, the control unit is probably defective and should be checked.
TEST PROCEDURES
7
6
5
4
2
1
5
DE F R OS T
4
8
C OOK
7
0
R E HE AT
Key Unit
control unit is defective.
OPERATIONAL VOLTAGE
Approx. 12.0V D.C.
Approx. 11.0V D.C.
WEIGHT
1ST STAGE
0.5lb
LEVEL
TIME
60% 1min 3sec.
COMPONENT TEST
3
2
1
S T AR T
T IME R
9
C LOC K
S T OP
3
C LE AR
P OWE R
MINUT E
6
LE V E L
P LUS
CONNECTED COMPONENTS
Oven lamp / Turntable motor / Cooling fan motor
Power transformer
2ND STAGE
LEVEL
TIME
40%
24sec.
16
Pin
Pin
No. G1
No. G14
Key unit ribbon cable
Key unit (Membrane Switch) front view
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