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DW - S114X
9. Fine Focus Offset Adjustment
@ Objective
To optimize the DC offset voltage of the focus servo circuit.
@ Symptom when out of | The player does not focus in, sound broken and the RF signal is dirty.
adjustment
e@Measurementinstru-
| Connect the oscilloscope to
@ Player state
Spindle rotation frequency : Normal
ment connections
TP201 (CN601), Pin 1 (RF).
speed, focus ON, spindle ON,
tracking ON
Settings]
20 mV/division
I
és]
500 ns/division
@ Adjustment location
| VR6 (FE. OFS)
AC mode
@ Disc
YEDS-7
{Procedure]
1. Move the pickup to midway across the disc (R=35mm). Spindle rotation frequency : Normal speed, focus ON, spindle
ON and tracking ON put the player into play mode.
2. Adjust VR6 (FE. OFS) so that the eye pattern of TP201 (CN601), Pin | (RF) (the diamond shape at the center of the RF
signal) can be seen the most clearly.
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Out of adjustment
Optimum adjustment
49
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