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cDx-Miz2
3 Grating Adjustment-1(Fine adjustment)
¢ Purpose:
The grating may need adjustment in a replaced pick-
up unit.
«Maladjustment symptoms:
No disc playback, track jumping.
¢ Measuring equipment / jigs:
Oscilloscope, clock driver, two low-pass filters
¢ Measuring point:
E LPF output, F LPF output
* Test disc and setting:
SONY TYPE 4 (or ABEX TCD-782)
Test mode
« Adjustment position:
Pick-up grating adjustment hole
Waveform.1
X 20mvV / div.
Y 20mV / div.
5mS / div.
Waveform.2
0.5V/div.
Adjustment Procedure
0.5ys/div.
. Connect a low-pass filter as shown in the above di-
DC mode
agram.
. Press the Fe2 key to close focus.
(See Waveform.8 )
. Switch regulator OFF and remove the filters.
14
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