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An open circuit thermal cut-out (MG) TC1 indicates that the magnetron has overheated, this may be
due to resistricted ventilation, cooling fan failure.
An open circuit thermal cut-out (GRILL) TC2 indicates that the oven cavity has overheated, this may
be due to no load operation..
An open circuit thermal cut-out (CONV.) TC3 indicates that the convection fan winding has overheated,
this may be due to resistricted ventilation or locked cooling fan or locked convection fan motor.
CARRY OUT 4R CHECKS.
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
H 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.
Table: Resistance of Motor
Motors Resistance
Fan motor Approximately 293 Ω
Turntable motor Approximately 15 kΩ
Convection fan motor Approximately 288 Ω
Damper motor Approximately 11 kΩ
J BLOWN FUSE F1 20A
I NOISE FILTER TEST
CARRY OUT 3D CHECKS.
Disconnect the leads from the terminals of noise filter.
Using an ohmmeter, check between the terminals as
described in the following table.
CARRY OUT 3D CHECKS.
If the fuse F1 20A is blown, there is a shorts or grounds in electrical parts or wire harness. Check them
and replace the defective parts or repair the wire harness.
CARRY OUT 4R CHECKS.
CAUTION: Only replace fuse
with the correct value replacement.
K BLOWN FUSE F2 F8A
CARRY OUT 3D CHECKS.
1. If the fuse F2 F8A is blown when the door is opened, check the monitored latch switch SW1 and
monitor switch SW3.
2. If the fuse F2 F8A is blown by incorrect door switching replace the defective switch(es) and the fuse
F2 F8A.
Cx
Cy
R2
R1
L
L
WHT
RED
20A
F8A
N
L
F1
F2
MEASURING POINTS INDICATION OF OHMMETER
Between N and L Approx. 680 kΩ
Between terminal N and WHITE Short circuit
Between terminal L and RED Short circuit
If incorrect readings are absorbed, replace the noise filter unit.
CARRY OUT
4R CHECKS.
L (min) Cx ± 20% Cy ± 20% R1 R2
1.0mH 0.22µF 4700pF 10MΩ 680kΩ
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