Pioneer PD-M603 Manual de serviço - Página 24

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| PD-M603

1. Focus Offset Verification

@ Objective

Verify the DC offset for the focus error amp.

Measurement instru-

| Connect the oscilloscope to

@ Player state

Test mode, stopped

ment connections

TP1, Pin 6 (FCS. ERR)

(just the Power switch on)

[Settings]

SmV/ divigicn

@ Adjustment location

None

10 ms/division

DC mode

@ Disc

None needed

[Procedure]

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

2. Tracking Error Balance Verification

@ Objective

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

[Settings]

50 mV/division

5 ms/division

DC mode

[Procedure]

4. Supposing that the positive amplitude of the tracking error signal at TP1, pin 2 (TRK ERR) is (A) and he negative

amplitude is (B), the following expression is satisfied.

When

A23B,

When

A<B,

When there is a DC

When there is no DC

component