Panasonic AJ-D400P, Service Manual

Page: 83 / 867

1-35. LISTA Linearity Adjustment and Waving Measurement.
SPEC Linearity: Less than 3um, Waving: Less than 1.5um
MODE PLAY
TEST POINT TP601:ATF ERR (SERVO Board)
TP113:HSW (SERVO Board)
TG300:GND (SERVO Board)
ADJUSTMENT S1 and T1 Post Height
TAPE VFM3581KM, VFM3681KM
1. Confirm that the power is turned off and make a short-circuit between
TP902
,
TP116
and
TP101
to place the unit
in LISTA Linearity mode.
2. Turn on the power and playback an alignment tape.
3. Select the item “(2) Linearity Measurement” on the LISTA main menu and display the linearity waveform.
4. When the waveform as shown as below figure is displayed on the screen, press the “BS (back space)” key for
display the waveform to center of scale on the screen. And adjust height of S1 and T1 post by Post Driver so that
the linearity waveform is become flat as possible, and it should be in the specification.
%
Adjust linearity waveform in the red dot line on the screen.
&
& &
&
POINT:
The part of left side of waveform (entrance side) is adjusted by height of S1 post and part of right side of
waveform(exit side) is adjusted by height of T1 post.
Lower part of above waveform of figure is displayed lead on Cylinder.
When the post driver is remove from upper part of post, linearity waveform is changed.
After finish this adjustment, eject the tape and insert the tape again for confirm the shape of linearity
waveform does not changed.
5. After finish the linearity adjustment, measure the numerical value of linearity and waving.
Adjust linearity into this area