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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)
i
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)
Eo
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
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