Vco Free-Run Adjustment; Traverse Adjustment; Focus Bias Adjustment - Sony CFD-K10 Service Manual

VGO Free-ru n Adjustment
Procedure :
PLCK GNO
:udio:cD { rP7o3
ooaro
(
Short between TP704 pin O and pin @ on the audio-CD
board.
Connect a frequency counter between TP703 pinO
(PLCK) and pin@ (GND).
Activate the test mode.
Set the CD DUB SPEED (5407) to NORMAL and adjust
RV703 so that the frequency counter reads 4.3218MH2+
10kHz. (normal speed)
Set the CD DUB SPEED (5407) to HIGH and adjust
RV704 so that the frequency counter reads 8.768MH2+
10kHz. (high speed)
5.
After adjustment, release the set from the test mode.
6.
Remove the short provided in step 1 from TP704.
Adjustment Location: audio-CD board (See page 39')
Traverse Adiustment
This adjustment should be made when the optical pick'up is
replaced or repaired.
Procedure :
TE.O VREF
oscilloscop€
(dc ra nge)
l'
Connect an oscilloscope between TP701 pinO ffREF)
and pin O (TE-0) on the audio-CD board.
2. Active the test mode.
3. Press >H/K<
keys to move the optical pick.up to the
center position.
4. Place the compact disc (YEDS-l8) and press D key. The
system starts focus search, turns on the focus mode and
enter the CLV pull mode. The tracking and sled modes
are tumed OFF. For tracking servo to ON, press the
DISPLAY key.
5. Adjust RV791 on the CD motor board so that the
waveform on the oscilloscope is vertically symmetrical
with respect to 0V.
6.
After this adjustment, release the set from the test mode.
A = B
C = 1 . 7 1 0 . 8 V
VOLT/DIV: 1V
T I M E / D I V : 1 m S
CD motor board (See page 39.)
Focus Bias Adjustment
This adjustment should be made when the optical pick-up is
replaced or repaired.
Procedure :
oscilloscope
(dc ra ngô)
CD motor board
TP (RF OUT)
VREF (CN791 Pin@)
Connect an oscilloscope between TP (RF OUT) and
CN791 pin@ on the CD motor board.
Activate the test mode.
Press ))|/K{
keys to move the optical pick-up to the
center position,
1 .
2 .
4. Place the compact disc (YEDS.l8) and press D key.
5. Adjust RV792 on the CD motor board so that the
waveform on the oscilloscope shows a clear eye pattern.
6. After this adjustment, release the set from the test mode.
o RF Signal Reference Waveform (Eye Pattern)
VOLT/DIV: 0.2V
TIME/DIV: 500nS
0.8-
1.svÈp
When observing the pattern, set an oscilloscope to AC range
and increase the vertical sensitivity. This makes the pattern
more easily visible.
Adjuetment Location : CD motor board (See page 39.)
Adjustment Location :