Operating instructions

©2010 ACP Inc. 16400009 15
Trouble 1: Oven does not operate at all, no inputs can be accepted.
Troubleshooting Procedures (Dial Models)
When you get a complaint from customers, evaluate the complaint carefully. If the following symptoms apply, instruct
the customer in the proper use of the microwave oven. This can eliminate an unnecessary service call.
CAUTION
!
• Verifypropergroudingbeforecheckingfortrouble.
• Becarefulofthehighvoltagecircuit.
• Dischargethehighvoltagecapacitor.
• Whencheckingthecontinuityoftheswitchesorofthehighvoltagetransformer,disconnectoneleadwirefrom
thesepartsandthencheckcontinuitywiththeACplugremoved.Todootherwisemayresultinafalsereadingor
damagetoyourmeter.
• Donottouchanypartofthecircuitonthecontroller,sincestaticelectricdischargemaydamagethecontrol
panel.Alwaystouchyourselftoearthwhileworkingonthispaneltodischargeanystaticchargebuiltupinyour
body.
Does the
fuse blow?
NO
NONO
Does the fan motor work when you
shut the door and turn the timer?
YES
If outlet has proper voltage, check
continuity of power supply cord.
Replace power supply cord.
NO Continuity
Check continuity of interlock
monitor switch with door shut.
Replace interlock
switch assembly
Continuity
YES(Refer to next page)
Both continuity
Replace fuse and check
continuity of both interlock
switch’s contact and monitor
switch’s contact with door
partially open until monitor
switch contact.
Replace primary, secondary interlock
switch and interlock monitor switch.
NO
Fuse again
Disconnect one side of the
lead wire connected from
transformer to the high
voltage capacitor, and operate
oven.
Replace high voltage capacitor.
Replace high voltage transformer
Normal