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5. ADJUSTMENTS
@ Adjustment and Check Items
Perform the adjustment of this model in the order as
shown below.
1. VCO free-run frequency adjustment
2. Slider speed control offset adjustment
3. Playback power adjustment
4. Recording power adjustment
5. Focus offset adjustment
6. Main and Sub mix ratio adjustment
7. Tracking amp. gain adjustment
8. Tracking offset adjustment
9. Fine focus offset adjustment
10. Focus servo loop gain adjustment
11. Tracking servo loop gain adjustment
12. VCO free-run frequency verification
13. WBL offset adjustment
Measuring Equipment
1. Dual trace oscilloscope (10:1 probe)
2. Laser power meter
3. Test disc (YEDS - 7)
4. CDR disc with recorded
(Type No. CD- R63, manufactured by TDK.)
5. Low-pass filter (39k Q +1000pF)
6. Hight-pass filter (3.9k Q +180pF)
7. Signal generator
8. Frequency counter (measurable over 1OMHz)
9. Hexagonal screwdriver (1.5mm diagonal)
10. Other general tools
Adjustment Points and Their Names
VRI__
: WBL offset (WBL. OFS)
VR2__
: Tracking amp gain (TE. GAIN)
VR3__: Main and Sub mix ratio (MS. MIX)
VR4 _ : Tracking offset (TE. OFS)
VRS5 _ : Playback power (PB. PW)
VR6 _ : Focus offset (FE. OFS)
VRIOL : Slider speed control offset (SLD. OFS)
VR104 : Recording power (REC. PW)
VR601 : Focus servo loop gain (FCS. GAIN)
VR602 : Tracking servo loop gain (TRK. GAIN)
L603: VCO adjustment (VCO ADJ)
DW - S114X
HAMP
UNIT
TT
oa
D
VRS
SUB
UNIT
CN103
(TP1)
7
1
D
VR101
D
vR4
VR2
MAIN
UNIT
7
CN601
if (P2000
D vr6o2
CN1026
D vR6o1
(1P205)
4p creo
GMD 2
1B crP202)
coown BS
'a CN1004
Fig.1
Adjustment point
41
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