Sharp SYSTEM-CD555ZT(GY) User Manual

SYSTEM-CD555ZT
CD SECTION
"Track
skipping
and/or
no
TDC(Table
Of
Contents)
may
be
caused
by
a
build
up
of
dust
other
foreign
matter
on
the
laser
pickup
lens.
Before
attempting
any
adjustment
make
certain
that
the
lens
is
clean.
If
not,
clean
it
as
mentioned
below.”
1. Turn the power off.
2.
Gently
clean
the
lens
with
a
lens
cleaning
tissue
and
a
small
amount
of
isopropyl
alcohol.
Note:
Do
not
touch
the
lens
with
the
bare
hand.
1. Preparation for Adjustment
Setting the Test Mode
TEST
MODE
0
Pressing
simultaneously
the
All
the
segments
light
for
1.5
“CLEAR”
and
“CALL”
buttons,
set
|
seconds
and
then
the
Test
Mode
the
function
switch
to
“CD”.
0
indication
appears.
“|
F
=
=]
TEST
MODE
1
TEST MODE 2
TEST MODE 3
TEST MODE 4
TEST MODE 5
After
TEST
MODE
5
the
PLAY
button
is
inoperative.
Even
when
it
is
pressed
(6th
time),
key
entry
is
not
accepted.
In TEST MODE 0 press once the
PLAY button. (1st)
Laser lights.
In TEST MODE 1 press once the
PLAY button. (2nd)
Focus start
(Servo ON)
Disc rotates.
(Spin servo ON)
(Use the disc.)
In TEST MODE 2 press once the
PLAY button. (3rd)
In TEST MODE 3 press once the
PLAY button. (4th)
Tracking servo ON
(Use the disc.)
Track No. and time are indicated.
(Use the disc.)
In TEST MODE 4 press once the
PLAY button. (5th)
*Unless
the
CD
lid
switch
SW961
is
tumed
on,
the
test
mode
is
not
set.
Button Operation in Test Mode
14.
When
the
STOP
button
is
pressed,
all
operations
stop.
At
this
time
the
optical
pickup
does
not
slide,
and
TEST
MODE
0
is
displayed.
2.
While
the
UP/CUE(DOWN/REVIEW)
button
is
pressed,
the
optical
head
moves
from
inside
to
outside
or
from
the
outside
to
the
inside.
*
Operation
is
possible
both
during
playing
and
stopping.
e
While
this
operation
is
executed,
the
TEST
MODE
indication
does
not
change.
After
the
optical
pickup
is
slided
from
the
outside
to
the
inside
and
the
optical
pickup
switch
is
turned
on,
the
slide
stops.
(At
the
same
time
TEST
MODE
Ois
set.)
Notes:
1. Any buttons other than those specified above are invalid.
2. Before operation be sure to connect all the connectors.
442
SYSTEM-CD5552ZT
Servo Unit
All the semivariable resistors must be set in the mechanical center position.
Adjusting Parts
Instrument Connection
i
Set
TEST
MODE
0,
and
move
the
pickup
to
the
center
i
Set
Test
MODE
1
(make
sure
that
the
laser
lamp
lights)
After
loading
a
disc,
set
to
TEST
MODE
2.
(Check
to
see
that
focus
servo
is
ON.:
The
disc
does
not
rotate,
and
a
whining
sound
is
heard.)
Set
TEST
MODE
3
(Spin
servo
is
turned
on,,
and
the
disc
rotates)
i
|
i
Tracking
error
balance
adj.
NVRA1
*4
(See
Fig.
12-1)
Pin
6
(1/2Vcc)
and
pin
4
(TG1)
of
TP751
Set
TEST
MODE
4
(Tracking
servo
is
turned
on.)
|
Check
the
HF
signal
waveform
_
Amplitude
of
1.5-2.0
Vp-p
|
Pin
3
(HF)
and
pin
7
(GND)
of
'
|
(See
Fig.
12-2.)
|
TP751
Focus
gain
adj.
VR751
Adjust
to
obtain
the
same
waveform
|
Pin
1
(FG1)
and
pin
5
(FG2)
of
|
on
CH1
and
CH2.
*2
TP751
and
ground
(The
relay
circuit
|
is used.) |
Adjust to obtain the same waveform | Pin 4 (TG1) and pin 2 (TG2) of i
|
Tracking gain adj. VR750
on CH1 and CH2. *3 TP751 and ground (The relay circuit |
is used.)
Check
again
the
HF
signal
waveform.
'
Set
TEST
MODE
5,
and
make
sure
that
track
No.
and
time
are
displayed.
Stick
black
tape
on
the
disc,
and
play
that
section
(Fig.
13-1).
(Any
mode
other
than
the
test
mode
is
acceptable.)
E28.
Focus
offset
adj.
VR700
*4
(Fig.
13-2)
Pin
6
(1/2Vcc)
and
pin
1
(FG1)
of
:
TP751
*5
Tracking
offset
adj.
VR710
Pin
6
(1/2Vcc)
and
pin
4
(TG1)
of
TP751
*7
*
4.
Adjust
to
obtain
vertically
symmetrical
waveform
(Fig.
12-1)
with
respect
to
reference
DC
level.
The
reference
level
is
1/2Vcc.
(Amplitude
of
0.5
to
1.5
Vpp)
* 2. Input oscillation frequency: 1.3 kHz, 100 mV rms
* 3. Input oscillation frequency: 1.5 kHz, 300 mV rms
*
4.
Watch
the
monitor.
Adjust
so
that
the
error
waveform
is
uniform
and
minimum
(Fig.
13-2)
and
the
audio
output
is
played
properly
without
noise
(track
jump
noise)
and
free
from
skips
and
pauses.
*
5.
The
appropriate
measuring
range
of
the
oscilloscope
is
50mV
and
0.5mS.
Connect
the
trigger
to
pin
14
(HFOK)
of
CNS700.
Trigger
the
coupling
at
DC
and
(—)
slope.
Observe
the
waveform
in
the
normal
trigger
mode.
*
6.
Watch
the
monitor.
Adjust
so
that
the
error
waveform
is
uniform
and
minimum
(Fig.
13-2)
and
the
audio
output
is
played
properly
without
noise
(track
jump
noise).
*
7.
The
appropriate
measuring
range
of
the
oscilloscope
is
0.1V
and
0.5mS.
The
trigger
is
the
same
as
*5.
(Reference)
When
the
noise
element
of
the
error
waveform
is
large
and
unclear,
observe
the
waveform
through
the
low-pass
filter
(Fig.
13-3).
| SSR RER
MANNS
DL ARR RARRRA
OP. O.O OP OP OG. AK
, Vp-p
Reference
FarERETUTNINA
Mm
|
Syma
evel
—
AT
ALLARERARV
A
uP
anc
down
1/2
Vec
et
ee
—0.5~1.5Vp-p
ms
verter deed
Pin 7
Figure
12-1
Figure
12-2
2405

Sharp SYSTEM-CD555ZT(GY) Specifications

General

Brand	Sharp
Model	SYSTEM-CD555ZT(GY)
Category	Measuring Instruments
Language	English