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PD-41,PO-93700

6. ADJUSTMENTS

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 pick up or the circuitry. Adjust correctly following the adjustment procedure.

6-1. Adjustment items / verification item and order

Item

Test point

Adjustment location

Focus offset adjustment

TP 1, Pin6(FCS.ERR) | VR 103(FCS.OFS)

Grating adjustment

TP 1, Pin 2(TRK.ERR) | Grating adjustment slit

Tracking error balance adjustment

TP 1, Pin2(TRK.ERR)

| VR 102(TRK. BAL)

4 | Pick up radial/tangential direction tilt | TP 1, Pin 1(RF)

Radial

tilt

adjustment

screw,

adjustment

Tangential tilt adjustment screw

| 5 | RF level adjustment (RF level)

TP 1, Pin 1(RF)

VR 1(RF level)

Focus servo loop gain adjustment

TP 1, Pin 5(FCS.IN)

VR 152(FCS.GAN)

TP 1, Pin 6(FCS.ERR)

7 | Tracking servo loop gain adjustment

TP 1, Pin 3(TRK.IN)

VR 151(TRK.GAN)

TP 1, Pin 2(TRK.ERR)

Focus error signal verification

TP 1, Pin 6(FCS.ERR)

@ Abbreviation table

FCS.ERR

: Focus Error

FCS.OFS_: Focus Offset

TRK.ERR : Tracking Error

TRK.BAL

: Tracking Balance

FCS.GAN : Focus Gain

TRK.GAN:

Tracking Gain

FCS.IN _ : FocusIn

TRK.IN — : Tracking In

6-2. Measuring

instruments

and _ tools

Dual trace oscilloscope (10 : 1 probe)

Low-frequency oscillator

Test disc (YEDS-7)

Low-pass filter (39 k2+ 0.001 uF)

Resistor (100 ki)

Standard tools