Sony D-5 - Electrical Adjustment Procedures; Tracking Balance Adjustment; Sled Motor Offset Check and Adjustment; Focus Bias Adjustment

TRACKING BALANCE ADJUSTMENT
Conditions
The set should be placed either vertically or horizon-
ly. oscilloscope
tally (DC range)
Adjustment Procedure
main board C)
———
TPS Gem o y
(TE) l=
Connect the oscilloscope to main board TP9
(TE).
Put the set into service mode (see page 9-11). -
Press the ppl and Kg keys to move the FOP to
the center.
Insert the disc (YEDS-1) and close the top
panel.
Press the > Bikey.
(It will go from focus search to focus ON, and
CLV pull-in mode state. Tracking and sled are
OFF.)
Adjust RV1 so that the oscilloscope waveform
is symmetrical on the top and bottom in rela-
tion to 0 V.
Note: Take sweep time as long as possible to obtain
best waveform. \
. 3-7Y ss
ov
Bp.’
”Poville
A=B A=B8
Press the Ml key. Confirm that disc rotation
stops. If it does not, press the Mf key again,
longer.
After adjustment, release service mode (see
page 9-11).
Adjustment Location: main board
D-5/D-50
SLED MOTOR OFFSET CHECK AND
ADJUSTMENT
Conditions
precking balance adjustment should have been finish-
ed.
Close the top panel,
If the top panel is left open, natural light will enter
through the FOP objective lens, and adjustment will
not be correct. :
oscilloscope
Adjustment Procedure: (DC range)
main board C)
me
10505 (0) <0 +
(SLO) Le
Remove the sled motor +SD lead. (In this
adjustment, DC voltage is applied to the track-
ing amp inside IC501, so this prevents the sled
motor from running at abnormal-high speed if
RV504 is adjusted too far to the + or — side.)
Connect the oscilloscope to main board IC505
pin () (SLO).
Put the set into service mode (see page 9-11).
Press the MODE button (tracking and sled go
ON).
Press the > Bikey. (focus goes on).
(This should be made after step 4.)
Adjust RV504 so that the oscilloscope reading
is 0 +0.05 V.
Press the @ key.
Confirm that focus search operation stops. If
not, pressthe M key again, longer.
After adjustment, release service mode (see
page 9-11).
Reconnect the sled motor lead removed in
step 1.
Adjustment Location: main board, VR board
RV504 C505 (GQ) tSD_ Remove lead
VIO) for adjustment;
(VR
board)
(SLO)
(vio)
reconnect
afterward.
FOCUS BIAS ADJUSTMENT
Conditions
The set should be placed either vertically or horizon-
tally.
Adjustment Procedure: oscilloscope
(DC range)
main board C)
TN,
TP1 Om_—————_0 +
(RF) Le
Put the set into service mode (see page 9-11).
Connect the oscilloscope to main board test
point TP1 (RF).
Press the pp) and Kd keys to move the FOP
to the center. (Move the FOP to the music area
on the disc to enable easy visibility of the eye
pattern).
Insert the disc (YEDS-1) and close the top
panel.
Press the» &Bkey.
(It will go from focus search to focus ON, and
CLV pull-in mode state. Tracking and sled are
OFF).
Press the MODE button. (Tracking and sled go
ON).
Adjust RV2 so that the oscilloscope waveform
eye pattern is good. A good eye pattern means
that the diamond shape()in the center of the
waveform can be clearly distinguished.
@ RF Signal Reference Waveform (eye pattern)
VOLT/DIV: 200 mV
TIME/DIV: 500 nS
Pu i” V
RF level
When observing the eye pattern, set the
oscilloscope for AC range and raise vertical
sensitivity.
Press the ™ key. Confirm that disc rotation
stops. If not, press the Mj key again, longer.
After adjustment, release service mode (see
page 9-11).
Adjustment Location: main board
TP1 (RF)