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(8) Adjustment of Focus Offset
Adjust it in the same condition as to focus gain in
the state of all the servos are operated by pushing
PAUSE
Button
except
the measuring
equip-
ment connections, °
@) Connection of measuring equipment
HF
Pin Q) of TP-102
Test point E
Pin (2) of TP-101
Pin © of TP-101
=a
Oscilloscope
Audio Oscillator
Set to 620Hz,
1.0Vp-p
Frequency
Counter
3) Adjustment
@ Set the output of audio oscillator to 620 Hz,
1.0 Vp-p(+0.1V).
@ Select
oscilloscope
input
mode
at "ALTER-
NATE" or "CHOPPER"
and set it to 50 mV/
div or 20 mV/div (use 10:1 probe).
Observe by setting the sweep time to 0.2 or 0.5
us/div range.
IW
AWS XY va
@
A waveform to observe in this time called "Eye
Pattern''.
@
Adjust VR-103 for a minimum jitter amount.
15
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