TEST PROCEDURES
PROCEDURE
LETTER
COMPONENT TEST
BLOWN FUSE F M8A
CARRY OUT 3D CHECKS
1. If the fuse M8A is blown, there could be shorts or ground in electrical parts or wire harness.
Check them and replace the defective parts or repair the wire harness.
2. If the fuse M8A is blown when the door is opened, check the 2nd. latch switch, monitor switch and
monitor resistor.
If the fuse M8A is blown by incorrect door switching replace the defective switch(s) and the fuse
M8A.
3. If the fuse M8A is blown, there could be a short in the asymmetric rectifier or
there could be a ground in wire harness. A short in the asymmetric rectifier may have occured due
to short or ground in H.V. rectifier, magnetron, power transformer or H.V. wire. Check them and re-
place the defective parts or repair the wire harness.
CARRY OUT 4R CHECKS
CAUTION: Only replace fuse M8A with the correct value replacement
TOUCH CONTROL PANEL ASSEMBLY TEST
The touch control panel consists of circuits including semiconductors such as LSI, ICs, etc. Therefore,
unlike conventional microwave ovens, proper maintenance cannot be performed with only a voltmeter
and ohmmeter. In this service manual, the touch control panel assembly is divided into two units,
Control Unit and Key Unit, and troubleshooting by replacement is described according to the symp-
toms indicated.
1 Key Unit
The following ^y p s m toms indicate a defective key unit. Replace the key unit.
aj When touching the pads. a certain pad produces no signal at all.
b) When touching a number pad, two figures or more are displayed.
c) When touching the pads, sometimes a pad produces no signal.
2. Control Panel
The following symptoms indicate a defective control unit. Replacing the control unit.
2-1 In connection with pads.
a> When touching the pads, a certain group of pads do not produce a signal.
b) When touching the pads, no pads produce a signal.
2-2 In connection with indicators
a) At a certain digit, all or some segments do not light up.
b) At a certain digit, brightness is low.
c) Only one indicator does not light.
dj The corresponding segments of all digits do not light up; or they continue to light up.
e) Wrong figure appears.
f) A certain group of indicators do not light up.
g) The figure of all digits flicker.
2-3 Other possible problems caused by defective control unit.
a) Buzzer does not sound or continues to sound.
b) Clock does not operate properly.
c) Cooking is not possible.
14
To Next Page
Loading...
Need help?
General
