R-22JT
15
TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
be replaced with "monitor fuse and monitor switch assembly" part number FFS-BA033WRKZ, even
if the monitor switch operates normally. The monitor fuse and monitor switch assembly is comprised
of a 20 ampere fuse and switch.
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge two high voltage capacitors.
4. A continuity check across the temperature fuse terminals should indicate a closed circuit unless the
temperature of the temperature fuse reaches specfied temperature as shown below.
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TEMPERATURE FUSE TEST
5. Reconnect all leads removed from components during testing.
6. Reinstall the outer case (cabinet).
7. Reconnect the power supply cord after the outer case is installed.
8. Run the oven and check all functions.
CAUTION: IF THE TEMPERATURE FUSE INDICATES AN OPEN CIRCUIT AT ROOM TEMPERA-
TURE, REPLACE TEMPERATURE FUSE.
Magnetron (1) Failure:
Test magnetron (1) and Blower fan motor.
Magnetron (1), (2) Failure: Test magnetron (1), (2).
Check blower fan motor and ventilation opening.
Magnetron (2) Failure:
Test magnetron (2) and Blower fan motor.
Food has been burned in oven.
Temperature of oven inside is very high.
Oven temperature
fuse
Magnetron tempera-
ture fuse (2)
M a g n e t r o n t e m -
perature fuse (1)
150˚C
120˚C
Non resetable
type
EE1
EE3
EE2
Oven shut
off
Non resetable
type
Open
Close
Display or
temperature
temperature
Condition
Check point
1. Disconnect the power supply cord, and then remove outer case.
2. Open the door and block it open.
3. Discharge two high voltage capacitors.
4. Follow the procedures below for each thermistor.
4-1. MAGNETRON THERMISTOR TEST
Disconnect connector-H from the CPU unit. And disconnect the connector of the magnetron thermistor
from the switch harness. Measure the resistance of the thermistor with an ohmmeter. Connect the
ohmmeter leads to the leads of the thermistor.
Room Temp.
59˚F (15˚C)
68˚F (20˚C)
77˚F (25˚C)
Resistance
Approx. 373 k
Ω
Approx. 292 k
Ω
Approx. 231 k
Ω
If the meter does not indicate above resistance, replace the thermistor.
4-2. OVEN THERMISTOR TEST
Disconnect connector-B from the CPU unit. Measure the resistance of the thermistor with an ohmmeter.
Connect the ohmmeter leads to the leads of the thermistor.
Room Temp.
59˚F (15˚C)
68˚F (20˚C)
77˚F (25˚C)
Resistance
Approx. 373 k
Ω
Approx. 292 k
Ω
Approx. 231 k
Ω
If the meter does not indicate above resistance, replace the thermistor.
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THERMISTOR TEST
