Electrolux EI30BM55HB Technical & Service Manual page 35

Procedure
Letter
O
PROCEDURES TO BE TAKEN WHEN THE FUSE ON THE PRINTED WIRING BOARD
(PWB) IS OPEN.
To protect the electronic circuits, this model is provided with a fuse added to the primary on the
PWB.
1. Fuse check and repairs.
1) Disconnect the power supply cord.
2) Remove the covers.
3) Open the door and block it open.
4) Discharge high voltage capacitor.
5) If the Fuse is blown, replace power unit.
6) Make a visual inspection of the varistor. Check for burned damage. If the varistor has been
burned, replace the power unit.
7) Examine the touch control transformer with a tester for the presence of layer short-circuit
(check the primary coil resistance which is approximately 110Ù±10%). If any abnormal
condition is detected, replace the touch control transformer.
8) Reconnect all leads removed from components during testing.
9) Re-install the covers.
10) Reconnect the power supply cord after the covers are installed.
11) Run the oven and check all functions.
2. Follow the troubleshooting guide given below, if indicator does not light up after above
check and repairs are finished.
1) Disconnect the power supply cord.
2) Remove the covers.
3) Open the door and block it open.
4) Discharge high voltage capacitor.
5) Disconnect the leads to the primary of the power transformer.
6) Ensure that these leads remain isolated from other components and oven chassis by using
insulation tape.
7) After that procedure, re-connect the power supply cord.
STEP
The rated AC voltage is not present between
1
Pin No. 1 of the 3-pin con-nector (A) and the
cabinet side terminal of the relay RY1
The rated AC voltage is present at primary
2
side of touch control transformer.
8) Follow the troubleshooting guide given below for repair.
9) Disconnect the power supply cord, and then remove the covers.
10) Open the door and block it open.
11) Discharge high voltage capacitor.
12) Reconnect all leads removed from components during testing.
13) Re-install the covers.
14) Reconnect the power supply cord after the covers are installed.
15) Run the oven and check all functions.
Component Test
OCCURRENCE
3-13
Troubleshooting
CAUSE OR CORRECTION
Check supply voltage and oven power cord.
Touch control transformer or secondary circuit defective.
Check and replace the touch control transformer or
power unit.