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R-430BK
R-430BW
R-430BD
Procedure Letter
Component Test
L.
Checking the Control Unit (Confinued)
6. Disconnect the wire leads to the primary of power transformer.
7. Ensure that these leads remain isolated from other components and oven chassis by using insu-
lated tape.
8. After that procedure, reconnect
the power supply cord.
9. Check the sensor cook operation proceed as follows:
A. Touch REHEAT pad once and touch Start pad.
B. The control panel is in the sensor cooking operation.
C. After approximately 20 seconds, push plunger of select switch for more than 3 seconds. This
condition is the same as judgment by AH sensor.
D. After approximately
3 seconds, the display shows "XX. XX' which is the remaining cooking
time, and the display counts down,
If the above is not the case, the control unit is probably defective.
If the above checks positive, the AH sensor is probably defective.
lO.Disconnect
the power supply cord, and then remove outer case cabinet.
11. Open the door and block it open.
12. Discharge the high voltage capacitor.
13.Disconnect the dummy resistor circuit from the sensor connector of control panel.
14Carry out the necessary repair.
15Reconnect
all leads removed from components during testing and repairing.
16.Re-install the outer case cabinet.
17.Reconnect the power supply cord after the outer case is installed. Run the oven and check all func-
tions.
18.Carry out the "Water load cooking test" again and ensure that the oven works properly.
F-l
+
TO CONNECTOR
(F)
ON CONTROL
UNIT
CONNECTOR
1
PLUNGER
J
COM
~--k-l
NC
NO
2
F-2
+
Ri
F-3
+
3
R2
RI, R2:
22&J + 1% ll2W
R3:
4.3ka + 5% 1/4W
R4:
1 MQ + 5% 1/4W
Figure A. Sensor Dummy Resistor Circuit
12
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