SOI 01.05 FV
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599 36 78-06
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
E
SWITCH TEST
CARRY OUT 3D CHECKS.
Isolate the switch to be tested and using an ohmmeter check between the
terminals as described in the following table.
Table: Terminal Connection of Switch
Plunger Operation
COM to NO
COM to NC
COM; Common terminal
Released
Open circuit
Short circuit
NO; Normally open terminal
Depressed
Short circuit
Open Circuit
NC; Normally close terminal
If incorrect readings are obtained, replace the switch.
CARRY OUT 4R CHECKS.
F
THERMAL CUT OUT TEST
CARRY OUT 3D CHECKS
Disconnect the leads from the terminals of the thermal cut-out. Then using an
ohmmeter, make a continuity test across the two terminals as described in the
below.
CARRY OUT 4R CHECKS
Table: Thermal Cut-out Test
Parts Name
Temperature of
"ON" condition
(closed circuit).
(°C)
Temperature of
"OFF" condition
(open circuit).
(°C)
Indication of
ohmmeter
(When room
temperature is
approx. 20°C.)
Thermal cut-out
125°C TC01
This is not
reset able type
Above 125°C
Closed circuit
Thermal cut-out
125°C TC02
This is not
reset able type
Above 125°C
Closed circuit
If incorrect readings are obtained, replace the thermal cut-out.
An open circuit thermal cut-out (MG) TC02 indicates that the magnetron has
overheated, this may be due to restricted ventilation, cooling fan failure.
An open circuit thermal cut-out (OVEN) TC01 indicates that the oven cavity
has overheated, this may be due to no load operation.
G
BLOWN FUSE F8A (F1)
CARRY OUT 3D CHECKS
If the fuse F8A (F1) is blown when the door is opened, check the primary
latch switch, monitor switch and monitor resistor.
If the fuse F8A (F1) is blown by incorrect door switching replace the
defective switch(es) and the fuse F8A (F1).
CARRY OUT 4R CHECKS
CAUTION: Only replace fuse with the correct value replacement.
