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Sharp SYSTEM-CD555ZT(GY) - Cabinet Exploded View

Sharp SYSTEM-CD555ZT(GY)
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SYSTEM-CD555ZT
Is
the
spin
motor
running?
No
Yes.
(Runs
at
extremely
high
speed)
fs
an
eye
pattern
being
output
to
pin
3
(HF)
of
test
point
TP751?
(Even
an
unclear
waveform
is
allowable.)
No
Yes.
(Waveform
of
approximately
Vp-p
1.5
V)
Is
the
eye
pattern
of
Vp-p
1.5
V
being
output
to
pin
17
(HF)
of
(C780?
No
Yes
{C780
is
defective.
ts
the
output
of
pin
4
(TG1)
of
TP751
(tracking
error
signal)
normal
in
test
mode
3?
Error
Normal
AWKAAAH
Is
the
tracking
gain
adjusting
VR750
set
to
the
minimum
position?
Yes
No
.ls
there
any
tracking
output
to
pin
28
(TSOUT)
of
(C750
in
test
mode
4?
No
Yes
ts
there
any
output
between
pins
11
and
14
of
IC700?
No
.
Yes
When
test
mode
2
is
switched
to
test
mode
3,
does
voltage
generate
between
pins
11
and
14
of
1C720
for
approximately
0.3
-
1.5
seconds?
Yes
|
Faulty
spin
motor
or
disconnection
0.3
~
15sec
|
ae
|
The
1C780
or
microcomputer
section
is
No
|
defective.
a
0.3
~
1.5sec
When
test
mode
2
is
switched
to
test
mode
3,
is
pin
3
(PWM2)
of
1C780
at
a
high
level
for
0.3
-
1.5
seconds
and
then
does
a
pulse
generate?
Yes
Faulty
{C721
or
disconnection
Check
if
the
objective
lens
of
the
pickup
is
dirty.
If
so,
clean
it.
Check
the
connection
between
pin
11
(HF}
of
CFS700
and
pin
17
(HF)
of
IC780.
if
OK,
the
pickup
is
defective.
Check
the
PW6
pattern
and
C780.
Is
there
any
output
to
pin
9
of
Check
the
connection
between
the
CFS700?
No
|
CFS700
and
flexible
PWB.
If
OK,
the
pickup
is
defective.
Yes
Check
the
connection
between
pin
9
of
CFS700
and
pin
3
(TEIN)
of
1C750
(or
pin
4
(TG1)
of
TP751)
and
the
PWB
pattern.
Readjust
the
tracking
gain.
Check
the
peripheral
parts
of
[C750.
If
OK,
1C750
is
defective.
Check
the
peripheral
parts
of
{C700.
If
OK,
10700
is
defective.
Check
the
connection
between
the
IC700,
CFS700
and
flexible
PWB.
If
OK,
the
pickup
is
defective.
There
is
no
audio
output
from
both
L
and
R
channels.
No
Yes
ls
the
supply
voltage
of
IC810
normal?
Yes
No
Are
the
supply
voltages
of
IC811
normal?
Yes
~
is
the
signal
of
pins
1
and
8
of
[C810
being
output?
No
Yes
Check
the
C811,
Q811
and
Q812
along
the
signal
flow
and
then
the
connection
between
then.
Check
the
Q813
and
Q814
(for
muting).
Check
the
connection
between
the
pins
1
and
20
of
IC810
and
the
pins
6
and
7
of
CNP881.
Check
the
power
line
and
D901.
Check
the
power
line
and
the
power
circuit
of
the
main
unit.
Check
the
connection
between
the
1C780
and
IC781.
If
OK,
1C780
or
IC781
is
defective.
Is
the
digital
signa!
being
input
to
pins
1,
2
and
3
of
iIC810?
No
1C810
is
defective.
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