ACP MenuMaster RFS Subway, Service Training Manual

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27
Troubleshooting
Trouble 3: Display shows all figures set, but oven does not start cooking while desired
program times are set and S TART pad is touched.
CONDITION CHECK RESULT CAUSE REMEDY
1.Setting time
does not count
down when
touching START
pad.
2. Blower motor
or oven lamp
do not turn on.
No continuity.
Continuity.
Continuity
No continuity
Check the con-
nection between
CN1 connector
and PCB
assembly.
Defective
secondary switch.
Replace
secondary switch.
Defective PCB
assembly.
Replace PCB
assembly.
Check continuity
of secondary
switch (with
door closed).
Check blower
motor.
Check oven lamp.
Abnormal.
Abnormal.
Normal.
Defective blower
motor.
Defective oven lamp.
Replace blower
motor.
Replace oven lamp.
Loose connection.
Connect them
tightly.
CONDITION CHECK RESULT CAUSE REMEDY
Output is low.
Lower than 90% of
rating voltage.
Normal.
Abnormal.
Measure the
output power.
Decrease in power
source voltage
with load.
Suggest customer
contact local
electric power
utility co. or
electrician.
Check the
power source
voltage.
Defective
magnetron.
Replace
magnetron.
Trouble 4: Oven seems to be operating but little heat is produced in oven load.