Pioneer PD-M423 Manuel d'entretien - Page 19

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Également pour Pioneer PD-M423 : Manuel d'utilisation (16 pages)

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PD-M423, PD-M403

1. Focus Offset Verification

@ Objective

Verify the DC offset for the focus error amp.

@ Symptom when out of | The model does not focus in and the RF signal is dirty.

adjustment

@ Measurement instru-

| Connect the oscilloscope to

@ Player state

Test mode, stopped

ment connections

TPI, Pin

6(FCS. ERR)

(just the Power switch on)

10 ms/division

DC mode

@ Disc

None needed

[Procedure]

Verify the DC voltage at TP1, Pin 6 (FCS. ERR) is 0 + 50 mV.

Note : If the specified values cannot be obtained or no adjustment is possible by performing the

verifications or adjustments described in adjustment items 1 — 4, the pickup block may be defective.

2. Tracking Error Balance Verification

@ Objective

To verify that there is no variation in the sensitivity of the tracking photo diode.

@ Symptom when out of | Play does not start or track search is impossible.

adjustment

@ Measurement instru-

| Connect the oscilloscope to

@ Player state

Test mode, focus and spindle servos

ment connections

TP1, Pin 2(TRK. ERR). This

closed and tracking servo open

connection may be via a low

pass filter.

@ Adjustment location

| None

[Settings]

50 mV/division

5 ms/division

DC mode

[Procedure]

. Move the pickup to midway across the disc (R=35 mm) with the TRACK /MANUAL SEARCH FWD PtP. pp] or

REV KK. <klkey.

. Press the PGM (PROGRAM) key, then the PLAY/PAUSE [>/ []] key in that order to close the focus servo then the

spindle servo.

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

. 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

A2ZB,

When

A<B,

When there is a DC

When there is no DC

component