Service manual

SOI 03.06 FV 21/38 599 36 78-45
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
145°C TC01
Below 115°C Above 145°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 20A (F1)
CARRY OUT 3D CHECKS
If the fuse 20A (F1) is blown, there could be a short or a ground 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 20A with the correct value replacement.