Pioneer PD-M423 Manuale di servizio - Pagina 15

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PD-M423, PD-M403

8. ADJUSTMENTS

8.1. Adjustment Methods

If a disc player is adjusted incorrectly or inadequately, it may malfunction or not work at all even though there is

nothing at all wrong with the pickup or the circuitry. Adjust correctly following the adjustment procedure.

@ Adjustment items/Verification Items and Order

If the specified values cannot be obtained or no adjustment is possible by performing the verifications or adjustments

described in steps 1 — 4, the pickup block may be defective.

[sep [

mem —~—~S—*dCSSCeat

Point

|__Adlutnant Location

pe!) Focus offset verification

TP1, Pin6(FCS. ERR)

Tracking error balance verification

TP1, Pin2(TRK. ERR)

Pickue radial/tangential direction tilt

TP1, Pin 1(RF)

Radial as adjustment screw,

adjustment

Tangential tilt adjustment screw

;

Pani

TP1, Pin S(FCS. IN)

| Focus servo loop gain adjustment

TP1, Pin 6(FCS. ERR)

R152(FCS. GAN)

d a

a t

TP1, Pin3(TRK. IN)

ae Tracking servo loop gain adjustment

TP1, Pin2(TRK. ERR)

R151 (TRK. GAN)

@ Abbreviation table

FCS. ERR _ :Focus Error

TRK. ERR

:Tracking Error

FCS GAN _ :Focus Gain

TRK GAN:

Tracking Gain

FCS. IN

:Focus In

TRK.IN

—:Tracking In

@ Measuring Instruments and Tools

1. Dual trace oscilloscope (10:1 probe)

2. Low-frequency oscillator

3. Test disc (YEDS- 7)

4. Low pass filter (39k Q +0.001 u F )

5. Resistor (100 kQ )

6. Standard tools