Pioneer PDR-04 - Manual (Page 69)

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
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