5-16
(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.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
1.Setting time does
not count down
when touching
START pad.
2. Fan motor or
oven lamp
do not turn
on.
No continuity.
continuity.
No continuity.
Continuity.
Check the con-
nection between
connector and
P.C.B assembly.
Defective
secondary switch.
Replace
secondary switch.
Defective P.C.B
assembly.
Replace P.C.B
assembly.
Check continuity
of secondary
switch (with
door closed).
Check fan motor.
Check oven lamp.
Abnormal.
Abnormal.
Normal.
Defective fan
motor.
Defective oven
lamp.
Replace fan
motor.
Replace oven
lamp.
Loose connection.
Connection then
tightly.
CONDITION
CHECK
RESULT
CAUSE
REMEDY
Output is low.
Lower than 90% of
rating voltage.
Normal.
Normal.
Abnormal.
Abnormal.
Measure the
output power.
Disconnect the
wire leads from
relay 2 and check
on and off time
with multitester.
Defective P.C.B
assembly.
Replace P.C.B
assembly.
Decrease in power
source voltage
with load.
Suggest customer
contact local
electric power
utility co. or
qualified
electrician.
Check the
power source
voltage.
Defective
magnetron.
Replace
magnetron.
NOTE: Simple test of power output-conducted by heating one liter water for one min. if available.
Summary of Contents for MC-7684B
Page 9: ...SCHEMATIC DIAGRAM 4 3 ...
Page 30: ...6 2 15006A 13552A 14890A 13213A 13720D 14026A 14970A WTP018 13581A 13650A DOOR PARTS EV ...
Page 33: ...6 5 WSZ085 466001 43501A 466003 466001 44510A 43500A 466001 LATCH BOARD PARTS EV ...
Page 35: ...6 7 63302A 56170D 63303A WSZ002 WTT021 647781 WTT030 BASE PLATE PARTS EV ...
Page 36: ......