Sony D-555 - PLL Free Run Frequency Check;Adjustment

PLL Free Run Frequency Check and Adjustment
Check/Adjustment Procedure:
frequency counter
servo board
= as
os cuumee
.
Disconnect
the
jumper
point
@)
(EFM)
in
the
diagram below.
.
Connect
a
frequency
counter
to
servo
board
test
point
TP
(PLCK).
3.
Put
the
set
into
service
mode
(see
page
5);
.
Check
that
the
frequency
counter
reading
is
4.3218
+0.01
MHz.
If
not,
adjust
RV504
so
that
it
is
4.3218
+0.01
MHz.
.
After
adjustment,
release
service
mode
(see
page
St
6.
Short
the
jumper
point
shorted
in
step
1.
Cheek/Adjustment
Location:
servo
board
e
®eaeneee,
SXBL1T 2S
EFM solder jumper point
Disconnect for checking an
[eciestmen t. Short after
checking and adjustment.
6.04/25 (B)| 7 |S
2g0P/50 {SL}
ay PAde
EFM solder
jumper point
—— |
“F655 9S
050
5
| D-555/Z555
Tracking Balance Adjustment
Conditions:
The
set
should
be
placed
either
horizontally.
oscilloscope
Adjustment Procedure: (DC range)
servo board
TP
(TE) eS i +
VC
(1/2
Vec)
0m
—
(See page 6.)
1.
Connect
the
oscilloscope
to
servo
board
TP
(TE).
2.
Put
the
set
into
service
mode
(see
page
5).
3. Press the PPI and 44 keys to move the UPF to
the center.
4.
Insert
the
disc
(YEDS-18)
and
close
the
top
panel.
5. Press the PBN key.
It will go from focus search to focus on, and
CLV pull-in mode state. Tracking and sled are
OFF.
. Adjust RVS0O2 so that the oscilloscope waveform
is symmetrical on the top and bottom in relation
toOV.
Note: Take sweep time as long.as possible to obtain best
waveform.
A A
1.3—2.3 Vp-p9V
a | B
A=B A=8
.
Unplug
the
external
power
supply
to
stop
spindle
motor from rotating.
.
After
adjustment,
release service
mode
(see
page
SD
Adjustment Location: servo board
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