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R-9380
TEST
PROCEDURES
(CONT'D)
PROCEDURE
LETTER
COMPONENT
TEST
J
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 di-
vided into two units Control
Unit and Key Unit and troubleshooting
by unit replacement
is de-
scribed
according
to the symptoms
indicated.
I. Key Unit.
The following
symptoms
indicate
a defective
key unit. Replace the key unit.
a)
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
Unit
The following
symptoms
indicate
a defective
control
unit. Replace the control
unit.
2-l
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 up.
d)
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 ficker.
2-3 Other possible
troubles
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.
13
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