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PD-S601
3. Tracking Error Balance Adjustment
@ Objective
To correct for the variation in the sensitivity of the tracking photodiode.
@ Symptom when out of | Play does not start or track search is impossible.
adjustment
@ Measurement instru-
| Connect the oscilloscope to
@ Player state
ment connections
TP, Pin 2(TRK. ERR). This
connection may be via a low
pass filter.
Test mode, focus and spindle servos
closed and tracking servo open
@Adjustment location
| RF Board Assembly
[Settings]
50 mV/division
VR102 (TRK. BAL)
5ms/division
DC mode
YEDS-7
[Procedure]
1. Move the pickup to midway across the disc (R=35 mm) with the MANUAL SEARCH FWD DD or REV <klkey.
2. Press the PROGRAM key, then the PLAY > key in that order to close the focus servo then the spindle servo.
3. Line up the bright line (ground) at the center of the oscilloscope screen and put the oscilloscope into DC mode.
4, Adjust VR102 (TRK. BAL) so that the positive amplitude and negative amplitude of the tracking error signal at TP!
Pin 2 (TRK. ERR) are the same (in other words, so that there is no DC component).
1
When there is a DC
When there is no DC
component
component
34
PD-S601
4, Pickup Radial/Tangential Tilt Adjustment
@ Objective
To adjust the angle of the pickup relative to the disc so that the laser beams are shone straight
down into the disc for the best read out of the RF signals.
@ Symptom when out of | Sound broken;some discs can be played but not others.
adjustment
@Measurement instru-
| Connect the oscilloscope to
@ Player state
Test mode, play
ment connections
TP, Pin 1 (RF).
@ Adjustment location
| Pickup radia! tilt adjustment screw
{Settings}
20 mV/division
and tangential tilt adjustment screw
200 ns/division
AC mode
12-cm disc.
(YEDS-~7 can not be used.)
[Procedure}
. Press the MANUAL SEARCH FWD b> or REV <Ki key so that the radial / tangential tilt screws can be adjusted.
Press the PROGRAM key, the PLAY > key, then the PAUSE (0 key in that order to close the focus servo then the
spindle servo and put the player into play mode.
:
. First, adjust the radial tilt adjustment screw with a Phillips screwdriver so that the eye pattern (the diamond
shape at the center of the RF signal) can be seen the most clearly.
. Next, adjust the tangential tilt adjustment screw with a Phillips screwdriver so that the eye pattern (the
diamond shappe at the center of the RF signal) can be seen the most clearly(Figure 5).
. Adjust the radia! tilt adjustment screw and the tangential tilt adjustment screw again so that the eye pattern can be
seen the most clearly. As necessary, adjust the two screws alternately so that the eye pattern can be seen the most
clearly.
. When the adjustment is completed, lock the radial and tangential adjustment screw.
Note:Radial and tangentia! mean the directions relative to the disc shown in Figure 4.
Radial
direction
Phillips
screwdriver
Radial direction
Tangential direction
2,
eo C)
Philfips
screwdriver
Tangential
direction
Adjustment locations
35
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