Frigidaire GLBM188HB, Service Manual

Page: 24 / 47

Page 24
GLBM188HB
8 – 9
d) After approximately 3 seconds, the display shows “X X. X X “ which is the time for detecting moisture.
If the above is not the case, the control unit is probably defective.
If the above is proper, the humidity sensor is probably defective.
10)Disconnect the power supply cord, and then remove outer case.
11)Open the door and block it open.
12)Discharge high voltage capacitor.
13)Disconnect the dummy resistor circuit from the sensor connector of control panel.
14)Carry out necessary repair.
15)Reconnect 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 functions.
18)Carry out “Water load cooking test” again and ensure that the oven works properly.
R1,R2:22 Ω± 1% 1/2W
R3:4.3k Ω± ?5% 1/4W
R4:1M Ω± 5% 1/4W
Sensor Dummy Resistor Circuit
[17] Q: NOISE FILTER 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. Using an ohmmeter, check between the terminals as described in the following table.
If incorrect readings are obtained, replace the noise filter.
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.
MEASURING POINT INDICATION OF OHMMETER
Between N and H Approx. 470 K Ω
Between terminal N and LOAD Short circuit.
Between terminal L and LOAD Short circuit.
Plunger
NC
NO
COM
COM NO
NC
R3 R4
R1
R2
1
2
3
F-1
F-2
F-3
To connector (F)
on Control Unit.
CONNECTOR
MONITOR
FUSE
NOISE FILTER
NOISE SUPPRESSION COIL
LINE CROSS CAPACITOR
LINE BYPASS
CAPACITOR
0.0033μF / 250V
LINE BYPASS
CAPACITOR
0.0033μF / 250V
H
LOAD LOAD
N
RESISTOR
470 K