Sony CDP-470 - CDP-270;470 Adjustments (Section 2); RF PLL Frequency Adjustment and Lock Check; Optical Pick-up Focus Bias Adjustment; Optical Pick-up E-F Balance Adjustment

SECTION 2
ADJUSTMENTS
ELECTRICAL ADJUSTMENTS
1. Perform adjustments in the order given.
2. Use YEDS-18 (Part No. 3-702-101-01) disc unless
otherwise indicated.
3. Use the oscilloscope with more than 10M{Q2 im-
pedance.
RF PLL Frequency Adjustment/Lock Frequency
Check
Procedure:
frequency counter
main board
ara.
TP (PCK) 0-——-—_O
TP (GND) o——+o
. Ground test point TP (ASY).
. Connect the frequency counter to the test points
TP (PCK) and TP (GND).
. Turn POWER switch on.
. Adjust RV205 so that the reading on the fre-
queny counter is 4.3218 MHz.
.. (RF PLL frequency adjustment)
5. Remove the grounding wire from TP (ASY).
6. Put the disc (YEDS-18) in and press p button.
. Confirm that the reading on the frequency counter
is locked at 4.3218 MHz.
E-F Balance Adjustment
This adjustment should be made after replacing
the Optical Pick-up Block.
Procedure: oscilloscope
(DC range)
main board C)
TP (TEO) O0-——-——__O+
TP (A GND) O—_——__,0 -
Focus Bias Adjustment
This adjustment should be made after replacing
the Optical Pick-up Block.
Procedure:
oscilloscope
(DC range)
main board
TP (RF) =a
TP (RFG) o_O --
1. Connect oscilloscope to the test points TP (RF)
and TP (RFG).
2. Turn POWER switch on.
3. Put the disc (YEDS-18) in and press > button.
4,
Adjust
RV202
for
an
optimum
waveform
eye
pat-
tern. Optimum eye pattern means that shape “©”
can be clearly distinguished at the center of the
-waveform.
XXX
WY Wy
(x)
7.1-—1.5 Vp-p
AWAY
ONY
~0.1—0.05V
_
1. Connect the oscilloscope to the test points TP
(TEO) and TP (A GND).
. Ground TP (ADJ) to set an adjustment mode.
. Turn POWER switch on.
. Put the disc (YEDS-18) in and press p> button,
nA F&F W bv
. Adjust RV201 so that the traverse waveform is
symmetrical above and below.
6. After adjustment, cancel the adjustment mode.
VOLT/DIV: 1V
TIME/DIV: 1ms