Sony CDP-507ESD - SECTION 2 ADJUSTMENTS; Electrical Adjustments; Focus and Tracking Gain Adjustment

SECTION 2
CDP-227ESD/507ESD
ADJUSTMENTS
ELECTRICAL ADJUSTMENTS
1.
Perform
adjustments
in
the
order
given.
2. Use YEDS-18 (8-702-101-01) disc unless otherwise
indicated.
3.
Use
the
oscilloscope
with
more
than
10
MQ
im-
pedance.
Adjustment Mode
1. Connect main board test point ADJ and GND.
This is to prevent the disc table from opening
(cre though pits are not read, by making micro)
computer IC301 pin @) low.
2. Turn POWER switch on.
(To reset microcomputer.)
After
adjustment,
remove
the
lead
wire
connecting
test points ADJ and GND.
Adjustment Location: main board
‘CDP-227ESD/507ESD
Focus Bias Adjustment
This adjustment should be made when replacing
optical pick-up.
Procedure:
oscilloscope
(DC range)
digital board
oo
TP (RF)
o———o
TP (RFG)
1. Connect oscilloscope to test points RF and RFG.
. Put set into adjustment mode.
. Turn POWER switch on.
. Put disc (YEDS-18) in and press » button.
nA & W NY
. Adjust RV104 for an optimum waveform eye pat-
tern or so that the peak is maximum. Optimum
eye pattern means that shape ‘‘O” can be clearly
distinguished at the center of the waveform.
Adjustment Location: main board
$$
RF PLL Adjustment
Procedure:
frequency counter
digital board fee = oy
TP (PLCK) ot ae
TP (GND)
1. Connect main board test point ASY and GND.
2. Connect the frequency counter to main board test
points TP PLCK and TP GND.
3. Turn POWER switch ON (stop mode).
4. Adjust main board RV201 so that reading on
frequency counter is 4.3218 MHz +3 kHz.
5. Reconnect lead wires connected in adjustment
mode.
6. Put disc (YEDS-18) in and press » PLAY button.
7. Confirm that reading on frequency counter is
4.3218 MHz.
Adjustment Location: main board
4
-)
E-F Balance Adjustment
This adjustment should be made when replacing
optical pick-up.
Procedure:
. Put set into adjustment mode.
. Connect TP(TES) to ground.
. Turn POWER switch on.
. Put disc (YEDS-18) in and press » button.
an wn
. Adjust RV101 so that the traverse waveform is
symmetrical above and below.
7. After adjustment, cancel the adjustment mode.
VOLT/DIV: 1V
TIME/DIV: Ims
. Cnnnect oscilloscope to test points TEO and GND.
Focus/Tracking Gain Adjustment
A frequency response 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 adjustment.
Focus/tracking gain determines the pick-up follow-
up (vertical and horizontal) relative to mechanical
noise and mechanical 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 operates increases.
@ When gain is lowered, it is more susceptible to
mechanical shock and skipping occurs more easily.
@ When gain adjustment is off, the symptoms below
appear.
e The time until music starts
becomes longer for STOP
—> PPLAY or automatic
selection (K€ PPI buttons
pressed. (Normally takes
about 2 seconds.)
low or high
e Music does not start and
disc continues to rotate
for STOP >PPLAY or
automatic selection (#44
bPt buttons pressed.)
® Disc table opens shortly
after STOP >PPLAY.
low or high
e Sound is interrupted dur-
ing PLAY. Or time count-
er display stops progress-
ing.
e More poise during 2-axis
device operation.
6. Connect oscillo
7. Adjust RV304
the figure belo
The following is a simple adjustment method.
— Simple Adjustment —
Note: Since exact adjustment cannot be performed, remem-
ber the positions of the controls before performing the
adjustment. If the positions after the simple adjust-
ment are only a little different, return the controls to
the original position.
oscilloscope
(DC range)
Procedure:
main board
—_—
TP TEO O——7————O +
! | 7 ® Incorrect Exa
|
TP FEOQ- -7 lo
1. Keep the set horizontal.
If the set is not horizontal, this adjustment
(cannot be performed due to the gravity saint)
the 2 axis device.
2. Put set in adjustment mode.
3. Insert disc (YEDS-1) and press » PLAY button.
4. Connect oscilloscope servo board TP FEO. high tracking ga
5. Adjustment RV203 so that the waveform is as (higher funders
shown in the figure below. (focus gain adjustment)
VOLT/DIV: 100mV
TIME/DIV: 2mS
—-100mvVv
—ov
@ Incorrent Examples (DC level changes more than
i Adjustment Loca
on adjusted waveform)
low focus gain
VOLT/DIV: 100mVv
TIME/DIV: 2mS
—OoOv
high
focus
gain
VOLT/DIV:
100
TIME/DIV: 2mS