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[9] I: WEAK POINT (FOR FAN MOTOR) TEST
CARRY OUT 3D CHECKS.
If the weak point is blown, the fan motor or exhaust fan could be locked or there could be a shorts in the fan motor or exhaust fan. Check them and
replace the defective parts.
CARRY OUT 4R CHECKS.
CAUTION: Only replace weak point with the correct value replacement.
[10] J: WEAK POINT (IN NOISE FILTER) TEST
CARRY OUT 3D CHECKS.
If the weak point is blown, there could be 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 weak point with the correct value replacement.
[11] K: TEMPERATURE FUSE TEST
1. CARRY OUT 3D CHECKS.
2. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the temperature of the temperature fuse reaches
specified temperature as shown below.
Open temperature
Magnetron tempera-
ture fuse (1)
Magnetron tempera-
ture fuse (2)
Magnetron tempera-
ture fuse (1), (2)
Oven temperature fuse
3. CARRY OUT 4R CHECKS.
CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERATURE, REPLACE TEMPERATURE FUSE.
[12] L: MAGNETRON THERMISTOR TEST
1. CARRY OUT 3D CHECKS.
2. Disconnect the connector of the magnetron thermistor from the harness. Measure the resistance of each thermistor with an ohmmeter. Connect
the ohmmeter leads to the connector of each thermistor.
Room temperature
20°C
If the meter does not indicate above resistance, replace the thermistor.
3. CARRY OUT 4R CHECKS.
[13] M: EXHAUST THERMISTOR TEST
The exhaust thermistor can be checked by using the Special function (SF-6). Check the exhaust thermistor, referring to the pages of the Exhaust ther-
mistor check (SF-6).
If the display shows "OH", the exhaust thermistor is normal. If the display shows "no", the exhaust thermistor is abnormal and it should be replaced.
Close temperature
150°C
Non resetable type
120°C
Non resetable type
Resistance
Approx. 750KΩ
Display or
Condition
Magnetron (1) Failure:
EE1
Test magnetron (1) and fan motor.
Magnetron (2) Failure:
EE2
Test magnetron (2) and fan motor.
Magnetron (1), (2) Failure: Test magnetron (1), (2).
EE3
Check fan motor and ventilation opening.
Food has been burned in oven.
Oven shut off
Temperature of oven inside is very high.
6 – 4
R1900J
Check point
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