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MICROWAVE OVEN
PROCEDURE
LETTER
K
RELAY TEST
1.
Disconnect power supply cord and remove outer cabinet case.
2.
Open door and block it open.
3.
Discharge high-voltage capacitor.
4.
Disconnect the leads to the primary of the power transformer and ensure that these leads remain isolated
from other components and oven chassis by using insulation tape.
5.
Re-connect the power supply cord.
6.
Check voltage between Pin No. 1 of the 2 pin connector (A) and the common terminal of the relay RY1 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
NOTE: These relays are operated by D.C. voltage. Check voltage at the relay coil with a D.C. voltmeter
during the microwave cooking operation.
a. DC. voltage indicated ............. Defective relay.
b. DC. voltage not indicated ........ Check diode which is connected to the relay coil. If diode is good, control
RELAY SYMBOL
RY1
RY2
7.
Disconnect power supply cord and remove outer cabinet case.
8.
Open door and block it open.
9.
Discharge high-voltage capacitor.
10. Reconnect all leads removed from components during testing.
11. Reinstall the outer cabinet case, then reconnect power supply cord.
12. Run the oven and check all functions.
L
COMPU DEFROST TEST
WARNING: THE OVEN SHOULD BE FULLY ASSEMBLED BEFORE PERFORMING THE FOLLOWING PRO-
CEDURE.
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 and touch the number pad 5 twice; touch the start pad.
3.
The oven is in Compu Defrost cooking condition.
4.
The oven will operate as follows:
WEIGHT
0.5lb
5.
If improper operation is indicated, the control unit is probably defective and should be checked.
P P
r r
i i
o o
r r
t t
o o
S S
e e
r r
i i
a a
l l
P P
r r
i i
o o
r r
t t
o o
S S
e e
r r
i i
a a
l l
TEST PROCEDURES
COMPONENT TEST
unit is defective.
OPERATIONAL VOLTAGE
Approx. 24.0V D.C.
Approx. 23.0V D.C.
1ST STAGE
2ND STAGE
LEVEL
TIME
LEVEL
70%
30sec.
40%
N N
u u
m m
b b
e e
r r
1 1
2 2
0 0
0 0
1 1
5 5
4 4
N N
u u
m m
b b
e e
r r
1 1
2 2
0 0
0 0
1 1
5 5
4 4
Troubleshooting & Technical Data
CONNECTED COMPONENTS
Oven lamp / Turntable motor / Cooling fan motor
TIME
15sec.
6-9
Power transformer
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