Pioneer PD-M602/KUXJ Instrukcja serwisowa - Strona 24
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1. Focus Offset Verification
@ Objective
Verify the DC offset for the focus error amp.
10 ms/division
[Procedure]
2. Tracking Error Balance Verification
@ Objective
To verify that there is no variation in the sensitivity of the tracking photo diode.
pass filter.
;
;
@ Adjustment location
| None
{Settings]
50 mV/division
5 ms/division
[Procedure]
1. Move the pickup to midway across the disc (R=35 mm) with the TRACK /MANUAL SEARCH FWD pp . DP or
REV KX). <kikey.
2. Press the PGM(PROGRAM) key, then the PLAY [> key in that order to close the focus servo then the spindle servo.
3. Line up the bright line (ground) at the center of the oscilloscope screen and put the oscilloscope into DC mode.
4. Supposing that the positive amplitude of the tracking error signal at TP1, pin 2 (TRK ERR) is (A) and the negative
amplitude is (B), the following expression is satisfied.
When
A2B,
When
A<B,