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46-1, LD Servo System Adjustment
1. LD Tracking Balance Adjustment (SV-33 Board)
1) Fecus balance adjustment
Note: Perform successively 1) and 2) adjustment
2 Tracking balance adjustment
Mode
Sail
Signal
Frame 2201 (GRAY) (REFSP)
MD adjustment cable
As
oes
Measurement Point
| TRKG ERR (X)]
Mode
Stil
i
(Pin © of CN108)
Signal
Frame 2001 (GRAY) (REFIPI
Measuring Equipment | Oscilloscope
MD adjustment cable
'Adjusting Element
| RVIOL
Measurement Point
| [TRKG ERR (X)]
Specified Value
AzS=0n01V
(Pin @ of CNI05)
Measuring Equipment | Oscilloscope
'Adjusting Element
R¥IO2
Specified Value
Maximum amplitude
Adjustment. metho
1) Select STILL 0) mode.
2) Search the frame 2201 (GRAY).
8) Turn the thread servo off, (MD adjustment cable
SLED SW OFF)
4) Turn the tracking servo off, (MD adjustment cable
TRKG SW OFF)
5) Adjust with RV102 so as td maximize the signal
'i
nn fy a
f i
tit ne
' oF :
AV/DIV Brose /DIY
Fig. 14,
Adjustment method
Note: Perform successively this adjustment after *1)
Focus balance adjustment" is completed.
6) Adjust with RV1O1 so that the center voltage of
ov,
Alb:
the 'tracking error signal becomes 0£0,1Vde,
Select" STOP (m) mode,
Turn the tracking servo on,
Turn the thread servo on,
F e l
le]
evil
ait
a
a UT
Ht ri AA Hr
Pe
nt
1V/01¥ Smsec/DIV
Fig. 725
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