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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
Test mode, play
ment connections
TPt, Pin 1 (RF).
Player state
Pickup radial tilt adjustment screw
and tangential tilt adjustment screw
@ Adjustment location
[Settings]
20 mV/division
200 ns/division
AC mode
12-cm disc.
(YEDS-7 can not be used.)
[Procedure]
1. Press the MANUAL SEARCH
FWD p> or REV <ki key so that the radial / tangential tilt screws can be adjusted.
Press the PROGRAM key, the PLAY > key, then the PAUSE J) 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.
we
~ . 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).
4. Adjust the radial 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.
Note:Radial and tangential mean the directions relative to the disc shown in Figure 4
Radial
direction
Phillips
screwdriver
Radial direction
Tangential direction
0,
eo ©
3
Phillips
screwdriver
Dise
Tangential
Figure 4
|
direction
Adjustment locations
44
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