Operating instructions

©2009 ACP Inc. 16400005 17
Troubleshooting Procedures (Electronic 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.
• 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.
Trouble 1: Oven does not operate at all, no inputs can be accepted.
CONDITION CHECK
Check continuity of interlock
monitor switch with door closed
Check continuity of of primary
interlock switch contact with door
partially open until interlock
monitor switch contact close
Malfunction of
interlock
monitor switch
Shorted
contacts of
primary
interlock switch.
RESULT
Continuity
No Continuity
Replace fuse
CAUSE REMEDY
Replace
NOTE 1
Fuse blows.
Replace
NOTE 1
Defective low
voltage
transformer
0 or infinite
Approx.
260~320
(normal)
Replace
Check continuity of primary
winding of low voltage
transformer
Defective high
voltage capacitor
Normal
Replace
Disconnect one side of the lead
wire connected form high
voltage transformer to the high
voltage capacitor and operate
the unit
Continuity
Defective high
voltage
transformer
Fuse again
blows
Replace
CAUTION
!