Sony CDP-C8ESD - Electrical

CDP- C8ESD/C700/ C800
2-4. ELECTRICAL ADJUSTMENTS
1. Perform adjustments in the order given. 1. Put the set into test mode.
2. Use YEDS-18 (Part No: 3-702-101-01} disc unless other- 2. Connect oscilloscope to test point TP (RF) and test point
wise indicated. TP (RFG).
ad
Set disc (YEDS-18) and turn POWER switch on.
4. Adjust RV102 for an optimum waveform eye pattern or so
that the peak is maximum. Optimum eye pattern means
3. Use the oscilloscope with more than 10 MQ impedance.
RF
PLL
Frequency
Adjustment/Lock
Frequency
Check
that
shape
‘‘©”
can
be
clearly
distinguished
at
the
center
Procedure:
of
the
waveform.
frequency
counter
5. Turn
POWER
switch off.
RF signal waveform
ITN
\ WR |
MAXX AXA
Nt
main board
e07-e—C—
TP (PCK) oF +
TP (ASY) Qe——L -
Put the set into test mode.
Connect test point TP (ASY) to ground with lead wire.
Turn POWER switch on.
Connect the frequency counter to test point TP (PCK).
Adjust RV201so that the reading on frequency counter is
4.3218 MHz +30 kHz.
eae (RF PLL frequency adjustment) REFERENCE
Remove lead wire connecting TP (ASY) to ground. E
AXA
100000 \)
YXXXXK XK)
A=1.3+0.3 (Vp-p)
AkWN
6.
7.
Set
disc
(YEDS-18)
and
press
>
PLAY
button.
Focus/Tracking
Gain
Adjustments
8.
Confirm
that
the
reading
on
frequency
counter
is
A
frequency
responce
analyzer
is
necessary
in
order
to
4.3218
MHz.
perform this adjustment exactly.
However, this gain has a margin, so even if it is slightly off,
there is no problem. Therefore, do not perform this adjust-
ment.
Focus/tracking gain determines the pick-up follow up (verti-
cal and horizontal) relative to mechanical noise and shock
when the 2-axis device operate.
pon Seog (Lock frequency check)
9. Turn POWER switch off.
E-F Balance Adjustment
This adjustment should be made when replacing TOP (T-
type Optical Pick-up).
Procedure
:
ioe
ena)
However,
as
these
reciprocate,
the
adjustment
is
at
the
point
where
both
are
satisfied.
C)
¢
When
gain
is
raised,
the
noise
when
the
2-axis
device
oper-
main
board
ates
increases.
TP
(TEO)O————O
+
@When
gain
is
lowered,
mechanical
shock
and
skipping
TP
(ADO
|
oe
occurs
more
easily.
When
gain
adjustment
is
off,
the
symptoms
below
appear.
1.
Put
the
set
into
test
mode.
2.
Connect
test
point
TP
(TES)
to
ground
with
lead
wire.
lieing
ee
|
erat
Paring
«|
3.
Connect
oscilloscope
to
test
point
TP
(TEO).
4.
Set
disc
(YEDS-18)
and
turn
POWER
switch
on.
¢The
time
until
music
5.
Adjust
RV101
so
that
the
traverse
waveform
is
symmetrical
starts
becomes
longer
for
above and below.
Turn POWER switch off.
. After adjustment, remove the lead wire connected in step 5.
M@ STOP ~ PD PLAY or
automatic selection. (4,
>Pi buttons pressed.)
(Normally takes about 1
seconds.)
low low or high
Oo
A=8
A (within 5%)
@ Music does not start and
disc continues to rotate
for @ STOP — — PLAY - low
or automatic selection.
(Kd, PI buttons pressed.)
Bg VOLT/DIV: IV
TIME /DIV: Ims
Focus Bias Adjustment
This adjustment should be made when replacing TOP (T-
type Optical Pick-up).
eDisc table opens shortly
after M STOP ~p
PLAY.
low or high =
Procedure:
oscilloscope
,
(DC
range)
Sound
is
interrupted
dur-
ing
PLAY
or
time
counter
=
display
stops
progressing.
main
board
;
Z
,
——s
@More
noise
during
2-axis
TP (RF) O————-O + high high
TP (RFG)O-————_-o —
device operation.