Electrolux MC1751E Service Manual page 21

PROCEDURE
LETTER
M
PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE
PRINTED
WIRING BOARD (PWB) IS OPEN
To protect the electronic circuits, this model is provided with a fine foil pattern
added to the input circuit on the PWB, this foil pattern acts as a fuse. If the foil
pattern is open, follow the troubleshooting guide given below for repair.
Problem: POWER ON, indicator does not light up.
NOTE: *At the time of making these
CARRY OUT 4D CHECKS
SOI 01.05 FV
TEST PROCEDURES
STEPS OCCURRENCE
1 The rated AC voltage is not
present between Pin No. 5-1 of the
3 pin connector (A)
2 The rated AC voltage is not
present at primary side of low
voltage transformer.
3 Pattern at "a" and "b" are broken.
4 Pattern at "c" and "d" are broken.
repairs, make a visual
inspection of the varistor.
Check for burned damage. If
any abnormal condition is
detected, replace the
defective parts.
COMPONENT TEST
CAUSE OR CORRECTION
Check supply voltage and oven power
cord.
Low voltage transformer or secondary
circuit defective.
check and repair.
*Insert jumper wire J1 and solder.
(CARRY OUT 3D CHECKS BEFORE
REPAIR)
*Insert the coil code 5028 24 08-00/9
between "c" and "d
(CARRY OUT 3D CHECKS BEFORE
REPAIR)
21/33 599 36 78-06