Sony CDP-590 - RF PLL Frequency Adjustment;Lock Frequency Check; E-F Balance Adjustment; Focus;Tracking Gain Adjustments

SECTIOIM
2
ELECTRICAL ADJUSTMENTS
1.
Perform adjustments in the order given.
2. Use YEDS-18
(Part
No :
3-702-101-1)
disc
unless
otherwise
indicated.
3.
Use the
oscilloscope with more than
10
MQ impedance.
RF PLL Frequency Adjustment/Lock Frequency Check
Procedure :
frequency
counler
Main board
'
TP
(PCK) --I
ot
1.
Connect test point
TP (ASY) to ground with lead wire.
2.
Turn POWER switch
on.
3. Connect the frequency counter to test point TP (PCK).
4.
Adjust RV20I
so
that the reading on frequency counter
is 4.3218 MHz±30 KHz.
(RF PLL frequency adjustment)
5. Remove lead
wire
connecting TP (ASY) to ground.
6.
Set disc (YEDS-18) and press
t>
PLAY button.
7.
Confirm that the reading on frequency counter is 4.3218
MHz.
(Lock frequency check)
8.
Turn POWER switch off.
E F Balance Adjustment
This adjustment should
be made
when replacing TOP
(T-lype Optical Pick-up).
Procedure :
oscilloscope
(DC range)
TP
(TEO)
0
j-o*
1. Connect test point TP (ADJ) to ground and TP (TES) to
TP
(VC)
with lead wire.
2.
Connect
oscilloscope
to test
point TP (TEO).
3.
Set
disc (YEDS-18) and turn
POWER switch on.
4.
Adjust
RVIOI
so
that the traverse
waveform is
symmetrical above and below.
5.
Turn POWER
switch off.
6. After
adjustment, remove the lead
wire connected in step
1
.
A^D
”
(wiihin S%)
„
VOLT/DIV;lV
°
TIME/DIVtIms
Focus Bias
Adjustment
This adjustment
should be
made
when
replacing
TOP
(T-type
Optical
Pick-up).
Procedure :
oscilloscope
(DC
range)
main
board
TP
(RF)
TP (RFC)
o
l-o-
1. Connect oscilloscope to
test point TP (RF) and test point
TP (RFC).
2. Set disc (YEDS-18)
and turn POWER switch on.
3.
Adjust RV102
for an optimum waveform
eye
pattern or
so that the peak is maximum. Optimum eye pattern means
that
shape “0”can be clearly distinguished at the center
of the waveform.
4.
Turn POWER switch off.
RF
signal waveform
A=l.3±0,3
(Vpp)
[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
adjustment,
Focus/tracking
gain determines the pick-up follow
up
(vertical and horizontal) relative
to mechanical noise and
sliock when
the 2-axis device operate.
However,
as these
icciprocatc,
the adjustment is
at the point
wlicre
both are satisfied.
•
When gain is raised, the noise when
the 2-axis device
operates increases.
•
When gain
is
lowered,
mechanical shock and skipping
occurs moie easily.
•
When
gain adjustment is off, the symptoms below
appear.
^
Gain
Symptoms
^
—
Focus Tracking
•
The time until music starts
becomes longer for BSTOP-*
t>
PLAY
or
automatic selection.
(Hi
FM
buttons pressed.) (Normal-
ly
lakes about 1 seconds.)
low low or high
•
Music does
not start and
disc
continues
to
rotate for BSTOP
-»[>PLAY or automatic selection.
(Hi
H
buttons pressed.)
-
low
• Sound is
interrupted
during
PLAY or
time counter
display
slops
progressing.
-
low
•
More noise during 2-axis
device
operation.
high high
-
4
-