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PD-xXS40M
9. ADJUSTMENTS
The adjustment items of this model should be performed
in the order as shown below.
e Adjustment and check Items
Tracking offset. focus offset and RF offset adjustments
RF level adjustment
LD (Laser Diode) output power confirmation
Focus lock and spindle lock confirmation
Grating adjustment
Tracking balance adjustment
Tangential adjustment
Focus gain adjustment
Tracking gain adjustment
. VCO free-run frequency adjustment
. Method to confirm S character
(FOCUS ERROR)
. MSB adjustment
KH
KB OMIA
WA
WH
| Ge
i e e a t e e ee
e n e i s
— N
Measuring
Equipment
Dual trace oscilloscope
Laser power meter
Test disc (YEDS7)
Tracking balance adjustment filter
Loop gain adjustment filter
Signal generator
Frequency counter
Other general tools
00)
SE ON
Oe
aR GN
@
VR5
(TRK.BAL)
CN11
VR7
(TRK. OFS)
6
1 TPI
[eeeeay CN101
(RF.OFS)
* Test
Mode
All the adjustments should be performed in Test Mode.
Test Mode setting and cancellation procedures
(1)
To set the Test Mode, turn the POWER
switch of the
player (S401) ON pushing the TEST MODE SWITCH
(S1).
(2)
To canacel the Test Mode, simply turn the POWER
switch of the player OFF.
The various key functions in the Test Mode are listed in
Table 9-1.
« Adjusting
Points
VRI: Laser power
VR7: Tracking offset (TRK.OFS)
VR3: Focus gain (FCS.GAN)
VR4: Tracking gain (TRK.GAN)
VRS: Tracking balance (TRK.BAL)
VR6: Focus offset (FCS.OFS)
VR8: VCO
adjustment (VCO.ADJ)
VR2: RF offset (RF.OFS)
al
=<
GO Girrkca
VR3
(FCS.GAN)
GND!
Leal ae
VRB
(VCO.ADJ)
=
1P2
oS
[
mode
switch
Fig. 9-1
Adjusting point
34
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