Pioneer PD-M423 Service Manual - Page 20

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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

;

@ 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.

Phillips

screwdriver

Tangential

direction

Radial direction

Tangential direction

27 ©) 3

Disc

Figure 2

Radial direction

Adjustment locations