Electrolux MCC4060E Service Manual page 27

PROCEDURE
LETTER
P PROCEDURES TO BE TAKEN WHEN THE FOIL PATTERN ON THE
PRINTED WIRING BOARD (PWB) IS OPEN
SOI 12.06 FV
TEST PROCEDURES
DC. voltage indicated .......... Defective relay.
DC. voltage not indicated .... Check diode which is connected to the relay coil. If
RELAY SYMBOL OPERATIONAL VOLTAGE
RY1
RY2
RY3
RY4
RY5
RY6
RY7
RY8
CARRY OUT 4R CHECKS
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.
CARRY OUT 3D CHECKS
STEPS OCCURRENCE
1 The rated AC voltage is not
present between Pin No. 1 - 3 of
the 4 pin connector (E)
2 The rated AC voltage is not
present at primary side of low
voltage transformer.
3 Only pattern at "a" is broken.
4 Pattern at "a" and "b" are broken.
NOTE: *At the time of these repairs,
make a visual inspection of
the varistor for burning
damage and examine the
transformer with tester for the
presence of layer short circuit
(check primary coil resistance).
If any abnormal condition is
detected, replace the defective
parts.
CARRY OUT 4D CHECKS
COMPONENT TEST
diode is good, control unit is defective.
Approx.18.0 V D.C.
Approx.18.0 V D.C.
Approx. 24.0 V D.C.
Approx. 24.0 V D.C.
Approx. 24.0 V D.C.
Approx. 24.0 V D.C.
Approx. 24.0 V D.C.
Approx. 24.0 V D.C.
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 (J1).
(CARRY OUT 3D CHECKS BEFORE
REPAIR)
27/43
CONNECTED COMPONENT
Oven lamp / Turntable motor
High voltage transformer
Grill (Top) heating element
Convection heating element
Touch control transformer
Fan motor
Convection motor
Damper motor
CAUSE OR CORRECTION
599 37 42-75