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Sharp CD-JX20X(GY) - Page 19

Sharp CD-JX20X(GY)
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between
pins
11
and
14
of
IC720
for
approximately 0.3
-
1.5
seconds?
Faulty
spin
motor
or
disconnection
0.3
-
1.5sec
No
When
test mode
2
is
switched to test
mode
3,
is
pin
5(PWM2)
of
IC780
at
No
+
The
1C780
or microcomputer section
is
defective.
a
high
level for
0.3
-
1.5
seconds and
then does
a
pulse generate?
0.3
-
1.5sec
.
Is
an
eye pattern
being
output
to
pin
3(HF)
of test point
TP751?
(Even
an
No
+
Check
if
the objective
lens
of
the pickup
is
dirty.
If
so,
clean
it.
unclear waveform
is
allowable.)
Check the connection between
pin
11
of
CNP700 and
pin
15(HF)
of
IC780.
If
OK,
the
NlCl
or
pickup
is
defective.
Yes.
(Waveform
of
approximately Vp-p
1.5
V)
Is
the eye pattern of
Vp-p
1.5
V
being
output to
pin
15(HF)
of
IC780?
1
Yes
Check the
PWB
pattern
and
C780.
IC780
is
defective.
I
HF
error
(tracking error
signal)
‘norr-nal
in
test
mode
3?
Is
the output
of
pin
4(TGl)
of
TP751
No
Check the
CNP700,
flexible
PWB
and
NICl.
If
OK,
the
pickup
is
defective.
Normal
I-
Is
the tracking
gain
adjusting
VR750
set
to
the
minimum
position?
Check the connection between
pin
9
of
CNP700
and
pin
3(TEIN)
of
IC750
(or
pin
4(TGl)
of
TP751)
and the
F
Readjust the tracking
gain.
Yes
1
F
Check
the
peripheral
parts
of
IC750.
If
OK,
IC750
is
defective.
No
Is
there any output between
pins
11
and
14
of
IC700?
Check the peripheral parts
of
IC700.
If
OK,
IC700
is
defective.
Check,the connection between the
IC700
and flexible
PWB.
If
OK,
the
pickup
is
defective.
There
is
no
audio
output.
There
is
no
audio output
from
both
L
and
R
channels.
LN~
Check
the
Q813
and
Q814
(for
muting). Check the connection between the pins
1
and
20
of
IC810
and the
CNP881.
1
Yes
I
S
the supply voltage
of
IC810
normal?
1
Yes
No
l
Check the power
line
and
IC814.
Are
the supply voltages of
lC811
and
IC813
normal?
No
.
Check
the
power
line
and the power
circuit
of the main
unit.
Yes
No
+
Check the connection
between the
IC780
and
IC781.
If
OK,
IC780
or
IC781
is
defective.
-25-

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