MICROWAVE OVEN
Troubleshooting & Technical Data
6-12
PROCEDURE
LETTER
COMPONENT TEST
TEST PROCEDURES
(CONTINUED)
CHECKING CONTROL UNIT
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 sensor connector that is mounted to control panel.
5.
Then connect the dummy resistor circuit (see fig.) to the sensor connector of control panel.
6.
Disconnect the leads to the primary of power transformer.
7.
Ensure that these leads remain isolated from other components and oven chassis by using insulation tape.
8.
Re-connect the power supply cord.
9.
Check the sensor cook operation proceed as follows:
a. Touch Timer/Clock pad once, the Power Level pad twice, the Start pad once and the Number pad once.
b. The control panel is in the sensor cooking operation.
c. After approximately 25 seconds, push plunger of select switch for more than 3 seconds. This condition
is same as judgement by AH sensor.
d. After approximately 3 seconds, the display shows "xx.xx" which is remaining cooking time, and the dis-
play count down.
1.
If the above is not the case, the control unit is probably defective.
2.
If the above is proper, the AH sensor is probably defective.
10. Disconnect power supply cord and remove outer cabinet case.
11. Open door and block it open.
12. Discharge high-voltage capacitor.
13. Reconnect the sensor connector that is mounted to control panel.
14. Carry out the necessary repair.
15. Reconnect all leads removed from components during testing.
16. Reinstall the outer cabinet case, then reconnect power supply cord.
17. Run the oven and check all functions.
18. Perform the Water Load Cooking Test described on previous page to ensure proper operation.
P
P
P
P
rr
rr
ii
ii
o
o
o
o
rr
rr
tt
tt
o
o
o
o
S
S
S
S
e
e
e
e
rr
rr
ii
ii
a
a
a
a
ll
ll
N
N
N
N
u
u
u
u
m
m
m
m
b
b
b
b
e
e
e
e
rr
rr
1
1
1
1
2
2
2
2
0
0
0
0
0
0
0
0
1
1
1
1
5
5
5
5
4
4
4
4
