Sony CDP-70 - SECTION 2 ELECTRICAL ADJUSTMENTS; RF PLL Frequency Adjustment;Lock Frequency Check; E-F Balance Adjustment; Focus Bias Adjustment

CDP-770
SECTION 2
ELECTRICAL ADJUSTMENTS
1.
Perform
adjustments
in
the
order
given.
1.
Connect
oscilloscope
to
test
point
TP
(RF)
and
TP
(RFG),
2. Use YEDS-18
(Part No:
3-702-101-01)
disc
unless other-
2. Turn POWER
switch
on.
wise
indicated.
3.
Put
disc
(YEDS-18)
in
and
press
DP
button.
3.
Use
the
oscilloscope
with
more
than
10
MQ
impedance.
4.
Adjust
RV102
for
an
optimum
waveform
eye
pattern
or
so
that the
peak
is
maximum.
Optimum eye pattern
means
RF
PLL
Frequency
Adjustment/Lock
Frequency
Check
that
shape
“©”
can
be
clearly
distinguished
at
the
center
Procedure
:
of
the waveform.
frequency
counter
RF
signal
waveform
main board
\
KAKA
|
ee
pe
ANY
a
XA
.
Connect
test
point TP
(ASY)
to
ground
with
lead
wire.
XXX
AA
2.
Tum
POWER
switch
on.
NUN
3.
Connect
the
frequency
counter
to
test
point
TP
(PCK)
pene
a
and
TP (AG).
reo
wr
4. Adjust
RV201
so
that
the
reading
on
the
frequency
counter
is
43218MHz+30kHz.....
(RF
PLL
frequency
adjustment).
5.
Remove
lead
wire
connecting
TP
(ASY)
to
ground.
Adjustment
Location:
main
board
6. Put disc (YEDS-18) in and press > button.
7. Confirm that the reading on frequency counter is
4.3218MHz..... (Lock frequency check).
E-F Balance Adjustment
eee
:
:
EF
TEO
This
adjustment
should
be
made
when
replacing
TOP
(T
eatance
{
TE!
type
Optical
Pick-up).
ADJ
RV101
Procedure
:
oscilloscope
(DC
range)
it
FOCUS
RF
BIAS
RFG
AG
RF
PLL
ADJ
\RV102
PCK
FREQUENCY
,
ADJ/LOCK
‘d
main
boar
ere
FREQUENCY
TP
(TEO)
Om———-O
+
CHECK
TP (AG) Om—_——-0 ~
1. Connect test point TP (ADJ) and test point TP (TEI) to
ground with lead wire.
Connect oscilloscope to test point TP (TEO) and TP (AG).
Turn POWER switch on.
Put disc (YEDS-18) in and press > button.
Adjust RV101 so that the traverse waveform is symmetri-
cal above and below.
6. After adjustment, remove the lead wire connected in step
5.
VF wp
A=B
A (within 5%)
Bg VOLT/DIV: IV
TIME /DIV: Ims
Focus Bias Adjustment
This adjustment should be made when replacing TOP (T-
type Optical Pick-up).
Procedure:
oscilloscope
(DC
range)
main
board
Cc
a
TP (RF) O«———O +
TP (RFG)O—m——_—oO —