Kenmore 721.63662 Service Manual page 33

(TROUBLE 2) Oven does not operate at all, Display window does not display any figures,
and no input is accepted.
CONDITION
1. Fuse blows.
2. Fuse does not
blow.
CHECK
Check continuity
of monitor
switch (with
door closed).
Replace fuse
Check continuity
of primary
switch (with
door opened).
Disconnect one
side of the lead
wires connected
from Inverter.
Check continuity
of thermostat.
Check continuity
of power supply
cord.
RESULT
Continuity.
No continuity.
Continuity.
No continuity.
Normal.
Fuse blows again
No continuity.
Continuity.
No continuity.
7-22
CAUSE
Malfunction of the
monitor switch.
Shorted contact at
the primary switch.
Defective door or
control PCB.
Defective Inverter.
Defective
thermostat.
Defective power
supply cord.
REMEDY
Replace fuse,
primary, monitor
switches, and
P.C.B Assembly.
Replace fuse,
primary, monitor
switches, and
P.C.B Assembly.
Replace door or
control PCB.
Replace Inverter.
Replace
thermostat.
Replace power
supply cord.