Pioneer PD-S802 Manuale di servizio - Pagina 28

Sfoglia online o scarica il pdf Manuale di servizio per Lettore CD Pioneer PD-S802. Pioneer PD-S802 36.

3. Pickup Radial/Tangential Direction 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

TPI, Pin 1 (RF).

@ Adjustment location

| Pickup radial tilt adjustment screw

[Settings]

20 mV/division

and tangential tilt adjustment screw

200 ns/division

AC mode

YEDS-7

[Procedure]

. Press the TRACK / MANUAL SEARCH FWD D> DDI or REV <ki <ki key to move the pickup to halfway across the

disc (R=35mm).

Press the PGM (PROGRAM) key, the PLAY [> key, then the PAUSE [ll] key in that order to close the respective

servos 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 shape

at the center of the RF signal) can be seen the most clearly (Figure 3).

. 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.

. 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

Radial direction

Tangential direction

eo C) 8

Disc

Figure 2

Adjustment locations