Electrolux MC1751E Service Manual page 18

PROCEDURE
LETTER
H
NOISE FILTER TEST
CARRY OUT 3D CHECKS
Disconnect the leads from the
terminals of the noise filter.
Using an ohmmeter, check between
the terminals as described in the
following table.
If Incorrect readings are obtained, replace the noise filter unit.
CARRY OUT 4R CHECKS
I MOTOR WINDING TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the motor. Using an ohmmeter, check the
resistance between the two terminals as described in the table below.
If incorrect readings are obtained, replace the motor.
CARRY OUT 4R CHECKS.
LIVE TEST FOR MOTOR WINDING
CAUTION: The following procedure requires the oven to be connected
1. CARRY OUT 3D CHECKS.
2. Disconnect the leads from the primary of the high voltage transformer. Make
3. Connect the voltmeter, set to 250V AC, across the motor terminals. (Refer
4. Arrange the meter in a position where it can be read during the test.
5. Close the oven door.
6. Set the power level to 800W and set the relevant timer for about three (3)
7. Note the reading on the meter and carefully observe the motor under test to
8. CARRY OUT 3D CHECKS.
9. Remove the test meter leads.
10.Reconnect the leads to the primary of the high voltage transformer.
SOI 01.05 FV
TEST PROCEDURES
MEASURING POINTS
Between N and L
Between terminal N and WHITE
Between terminal L and RED
Table: Resistance of Motor
Motors
Fan motor
Turntable motor
to the supply and should only be used if the relevant "cold"
checks for the motor under test are inconclusive.
sure that the leads remain isolated from other oven components and
chassis (Use insulation tape if necessary) (See the pictorial diagram
page 33).
to the relevant motor test procedure or pictorial diagram for the correct
terminal numbers.)
(Do not touch the meter, meter leads or oven circuitry while the oven is
active.)
minutes.
see if it is turning.
COMPONENT TEST
INDICATION OF OHMMETER
Open circuit
Short circuit
Short circuit
Approximately 290
Approximately 12 - 15
18/33
Resistance
Ω
kΩ
599 36 78-06