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PD-M423, PD-M403
3. Pickup Radial/Tangential Tilt Adjustment
@ Objective
e@ Symptom when out of
{Sound broken;some discs can be played but not others.
adjustment
Connect the oscilloscope to
TPI, Pin | (RF).
@ Measurement instru-
Test mode, play
ment connections
@ Player state.
Pickup radial tilt adjustment screw
and tangential tilt adjustment screw
;
ae
@ Adjustment location
[Settings]
_20mV/division
200 ns/division
YEDS-7
[Procedure]
. 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 shape
at the center of the RF signal) can be seen the most clearly (Figure 3).
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.
5. When the adjustment is completed, lock the radial and tangential adjustment screw.
Note:Radial and tangential mean the directions relative to the disc shown in Figure 2.
NR
w
Phillips
screwdriver
Tangential
direction
Radial direction
Tangential direction
2,
27 ©) 3
Disc
Figure 2
Radial direction
Adjustment locations
30
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