Sears 721.62252200, Manual

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(TROUBLE 3) Display shows all figures set, but oven does not start cooking while desired
program times are set and START pad is touched.
(TROUBLE 4) Oven seems to be operation but little heat is produced in oven load.
1.Setting time
does not count
down when
touching START
pad.
2. Fan motor or
oven lamp do
not turn on.
No continuity.
Continuity.
Defective
secondary switch. Replace
secondary switch.
Check continuity
of secondary
switch (with
door closed).
Check the con-
nection between
CN1 connector
and PCB
assembly.
Continuity
No continuity
Abnormal
Abnormal
Normal
Defective fan motor.
Defective oven lamp.
Defective PCB
assembly.
Loose connection.
Output is low.
Lower than 90% of
rating voltage.
Normal.
Decrease in power
source voltage
with load. Suggest customer
contact local
electric power
utility co. or
qualified
electrician.
Check the
power source
voltage.
Disconnect the
wire leads from
relay 2 and
check on and off
time with
multitester.
Measure the
output power.
Abnormal.
Abnormal.
Normal.
Defective PCB
assembly.
Defective
magnetron.
Replace PCB
assembly.
Replace
magnetron.
Replace PCB
assembly.
Connect them
tightly.
Replace fan motor.
Replace oven lamp.
Check fan motor.
Check oven lamp.
CONDITION CHECK RESULT CAUSE REMEDY
CONDITION CHECK RESULT CAUSE REMEDY
NOTE: Simple test of power output-conducted by heating one liter water for one min. if available.
Minimum 8.5
o C temperature rise is normal condition.