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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.
ez
Focus offset verification
;
TP1, Pin6(FCS. ERR)
aia
Tracking error balance verification
TP1, Pin2(TRK. ERR)
3
Pickup radial/tangential direction tilt
;
TP1, Pin 1(RF)
Radial le adjustment screw,
adjustment
Tangential tilt adjustment screw
RF level verification
TP1, Pin (RF)
None
o h ,
a e
TP1, Pin 5(FCS. IN)
Focus servo loop gain adjustment
TPI, Pin6(FCS. ERR)
VR152(FCS. GAN)
:
xiv
TP1, Pin3(TRK. IN)
tment
é
a4 Tracking servo loop gain adjustmen
TPI, Pin2(TRK. ERR)
VR151(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. Resistor (100 kQ2 )
5. Standard tools
25
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