SOI 12.06 FV
23/43
599 37 42-75
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
THERMISTOR
TEST
CARRY OUT 3D CHECKS
Disconnect the connector B from CPU unit. Measure the resistance of the
thermistor with an ohmmeter. Connect the ohmmeter leads to Pin No’s C1 and
C3 of the thermistor harness.
Room
Temperature
Resistance
20°C - 30°C
Approximately 359.9 k
Ω
- 152
k
Ω
If the meter does not indicate above resistance, replace the thermistor.
CARRY OUT 4R CHECKS
G
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.
Table: Thermal Cut-out Test
Denominazione parte
Temperatura in
condizione "ON"
(circuito chiuso). (°C)
Temperatura in
condizione "OFF"
(circuito aperto). (°C)
Indication of ohmmeter
(When room temperature
is approx. 20°C.)
Interr. termico TC01 145°C
This is not
reset able type
Above 125°C
Closed circuit
Interr. termico TC02 170°C
Below 155°C
Above 170°C
Closed circuit
Interr. termico TC03 170°C
Below 155°C
Above 170°C
Closed circuit
If incorrect readings are obtained, replace the thermal cut-out.
An open circuit thermal cut-out (MG) TC01 indicates that the magnetron has
overheated, this may be due to restricted ventilation, cooling fan failure.
An open circuit thermal cut-out (GRILL) TC02 indicates that the oven cavity has
overheated, this may be due to no load operation.
An open circuit thermal cut-out (CONV.) TC03 indicates that the convection fan
winding has overheated, this may be due to restricted ventilation or locked
cooling fan or locked convection fan motor.
CARRY OUT 4R CHECKS
