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-CD20H
Servo Unit
All the semivariable resistors must be set in the iechanieal -center casition:
Test Stage
Adjusting Parts
Value/Adjusting Method
Test Mode 0
_ |
Pin 1 and Pin 2 of CNP701
_Pin 3 and Pin 4 of CNP701__
_Tracking offset
Test Mode 1 (Confirmation of laser lighting)
After loading the disc, set to Test Mode 2 (focus servo ON)
Test Mode 3 (Spin Servo ON)
* Tracking error balance
VR701
~ Test Mode 4 (Tracki ng Servo ON)
Pin 8 and pin 3 (Ground) of TP1
Adjust
to obtain
clear
and
max.
amplitude
of eye
pattern
(more
than 0.58 Vp-p) and min. jitter.
Pin 6 (CH1) and pin 7 (CH2):of TP1
Adjust to 'obtain the same waveform '
VA705
on CH1 and CH2. +*2
and ground
Adjust to obtain the same waveform
Pin 4 {CH1) and pin 5 {CH2) of TP1
. ERG RING Cain
is
on CH1 and CH2. >3
and ground
|
*2 [nput oscillation frequency: 1.5 kHz, 350 mV rms
*3 Input oscillation frequency: 1.5 kHz, 350 mV rms
fF __slCNP700
Symmetrical
Figure 20—1
6
[[everoe
|
Figure 20—2
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