Sony D-99 - Electrical Adjustment Procedures; Tracking Balance Adjustment; RF Signal Reference Waveform; Focus Bias Adjustment

Tracking Balance Adjustment
Conditions :
The set should be placed either horizontally.
Adjustment Procedure :
oscilloscpe
(DC_range)
main board
———
TP9 (TE)
vc
Connect the oscilloscope to main board TP9 (IC501@).
Put the set into service mode (See page 4.)
Press the >| and Ké4 keys to move the UPF to the center,
Insert the disc (YEDS-18) and close the top panel.
Press the Dil key.
It will go from focus search to focus on, and CLV
OU AE on
pull-in mode state, Tracking and sled are OFF,
6. Adjust RV502 so that the oscilloscope wavaform is
symmetrical on the top and bottom in relation to OV.
time as lon ossible to obtain best wave-
Note : Take swee as
form.
A A
1-2Vpp OV .
OV B |
A=B Bose
7, -Unplug the external power supply to stop spindle motor
from rotating.
8. After adjustment, release service mode (see page4).
Focus Bias Adjustment
Conditions :
The set should be placed either horizontally.
Adjustment Procedure :
oscilloscope oscilloscope
(DC range) main board (DC range)
main board ye
aati \ca0e fae
TP10 i a a ad TP11 (FE) “T+
ve —__—_———o - ve -
1. Put the set into STOP state in service mode (See page
4),
2. Connect the oscilloscope to main board test point
TP10(CIC501@).
3. Press the bl and Kd key to move the UPF to the center,
(Move the UPF to the music area on the disc to enable
easy visibility of the eye pattern).
4, Insert the disc (YEDS-18) and close the top panel,
Press the Pll key.
or
D-99
6. Press the KEY-MODE button.
7, Adjust RV503 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 : 200mV
TIME/DIV : 500nS
Nain
RANMA
:
Wy "
O
WV
WY
44
RF
level
AYN
|
0,85-1,35V
NN
ue
When observing the eye pattern, set the oscilloscope
for AC range and raise vertical sensitivity.
8. Read the voltage on TP1l1 (1C502@),
+20mV to 50mV Adjust RV503 again for +50mV reading on oscilloscope,
+20mV to —20mV Adjust RV503 again for —20mV reading on oscilloscope,
9, Unplug the external power supply to stop spindle
motor from rotating.
Adjust RV503 again refering to the table followed.
10. After adjustment, release service mode (see page 4).
Adjustment Parts Location Diagram
RV801
(Battery Remains Indication
Adjustment
(MAIN BOARD)
—SIDE A-—
RV450
RV401 +3,6V Adjustment
(+3,9V Adjustment) ( sustnent)
RV402
(+3.4V Adjustment)
{ }1C503
ves L_]
1C801 © 16301
RV501 ;
(Tracking Gain Adjustment)
RV502
(Tracking Balance Adjustment)
RV505 .
(Focus Gain Adjustment)
03
(Focus Bias Adjustment)
RV504
(PLL Free Run Frequency Check
and Adjustment)