Sony CDP-X55ES - Page 6

SECTION 2
ELECTRICAL ADJUSTMENTS
ELECTRICAL ADJUSTMENTS
1. Perform adjustments in the order given.
2. Use YEDS-18 (Part No: 3-702-101-01) disc unless other-
wise indicated.
3. Use the oscilloscope with more than 10 MQ impedance.
RF PLL Lock Frequency Check
Procedure : frequency counter
main
board
ae
TP
(PLCK)
9-0
+
TP
(RFG)
a
Ground
TP
(ADJ)
for
adustment
mode.
Ground
TP
(ASY).
Connect
the
frequency
counter
to
TP
(PCK).
Turn
the
power
on.
.
Set
disc
(YESD-18)
and
play
5th
program.
.
Confirm
that
the
reading
on
frequency
counter
is
4.3218MHz.
Anson p
E-F Balance Check
This check should be made after replacing the optical pick-up
block.
Procedure : oscilloscope (DC range)
main board S
V mpmepetinomemme’
TP EO) aes
ie:
. Ground TP (ADJ) for adjustment mode.
. Ground TP (TES) with lead wire.
. Connect oscilloscope to TP (TEO).
. Set disc (YEDS-18) and press > PLAY button.
. Confirm that the traverse waveform is symmetrical about
aor, whd
OV -axis.
6 Turn the power off and remove the lead wire connected to
TP (ADJ) and TP (TES).
A
ov A=8
8 A+B21.5Vp-p
RF Level Check
This check should be made after replacing the optical pick-up
block,
Procedure: oscilloscope (DC range}
main board Se
YP (RF) o——-0 +
TP (VC) 0-0 —
. Ground TP (ADJ) for adjustment mode.
. Connect the oscilloscope to TP (RF) and TP (GND).
. Set disc (YEDS-18) and press PLAY button.
. Confirm that waveform eye pattern is clear and RF level
m® WO NM Fe
is optimum. The optimum eye pattern means that shape “©”
can be clearly distinguished at the center of the waveform.
5. Turn the power off.
RF signal waveform
ALLA K LKR)
RRR |
\
UXXXYXKXXXXXY)
FRI)
|
A=1.2+0.2 (Vp-p)
REFERENCE
Focus/Tracking Gain Adjustments
A frequency responce analyzer is necessary in order to
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.
However, as these reciprocate, the adjustment is at the point
where both are satisfied.
@ When gain is raised, the noise when the 2-axis device oper-
ates increases.
@When gain is lowered, mechanical shock and skipping
occurs more easily.
e When gain adjustment is off, the symptoms below appear.
ea |
ing PLAY or time counter
ment are only a little different, return the controls to
@The time until music
starts becomes longer for
mM STOP ~ p> PLAY or
automatic selection. (M4, low low or high
>P! buttons pressed.)
(Normally takes about 1
seconds.)
display stops progressing.
the original position.
@ Music does not start and
disc continues to rotate
for @ STOP ~ > PLAY low
or automatic selection.
® More noise during 2-axis
device operation.
The following is a simple adjustment method.
~Primary Adjustment —
Note: Since exact adjustment cannot be performed, remem-
(Kd, PPI buttons pressed.)
e Sound is interrupted dur-
ber the positions of the controls before performing the
adjustment. If the position after the primary adjust-
Procedure:
oscilloscope (DC range)
main board &
TP (FEO) 070+
TP (TEO) O=- -/ | oe