Pdr-04 – Pioneer PDR-04 User Manual

Page 69

Attention! The text in this document has been recognized automatically. To view the original document, you can use the "Original mode".

PDR-04

6.3.19 H F Amp. Gain Adjustment

Adjustment 2

' Objective

' Symptom when out

of adjustment

To correct the discrepancy in the HF level with the pickup.

Player does not record, track search is impossible.

• Measurement instru

ment connections

Connect the oscilloscope to
CN104(TP1), Pin8(HF).

[Settings] 50 mV/div.

500 nS/div.

DC mode

i Player state

• Adjustment

location

• Disc

Test mode, play

VR119(HF. GAIN)

(HEAD BOARD assy)

STD-903

[ Procedure ]

(1 ) Move the pickup to midway across the disc (R = 35mm) with the MANUAL / TRACK SEARCH FWD ►► or REV

keys.

(2) Press the FINALIZE key, the PLAY ► key, then the PAUSE ll key in that order to close the respective servos and put

the player into play mode.

(3) Line up bright line (ground) at the center of the oscilloscope screen and put the oscilloscope into DC mode.

(4) Adjust VR119 (HF. GAIN) so that the amplitude of waveform at CN104 (TP1 ), Pin 8 (HF) is 2.0V + 0.1 V.

Note : Adjust after checking that the DISPLAY OFF KEY LED is OFF.

2.0V ± 0.1V