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3-33. LISTA Linearity Adjustment and Waving Measurement (25M mode)
SPEC.
Linearity : less than 3
TEST POINT
! ATF (R/P-L)
" H SW (R/P-L)
# GND
VTR MODE
PLAYBACK
ADJ. MODE
SERVO ADJUSTMENT MENU: "A15: RPL LIN25"
ADJUST
S1 and T1 Post Height
TOOL
VFK1149 or VFK1149B (Post Driver)
TAPE
NTSC: VFM3581KM or VFM3581KL(LISTA)
(PAL: VFM3681KM or VFM3681KL(LISTA))
Linearity Adjustment Procedures
1.
Connect the each clips of LISTA cable to test points.
2.
Set the Lista software in 25M mode. 25M and 50M mode can be changed by "0" key.
3.
Set the VTR in Service Mode to open the servo menu and select the item of "A15: RPL LIN 25".
4.
Playback the LISTA Alignment Tape.
5.
Select the item "<2> Linearity Measurement" on the LISTA main menu, and then linearity waveform appears on
the screen.
6.
When the waveform as shown below is displayed on the screen, press the "BS (Back Space)" key to move the
waveform at the center of the scale on screen. Adjust S1 and T1 post height by using the post driver so that the
linearity waveform becomes as flat as possible, and it should be within the specification.
♦ Adjust linearity, to have waveform in between the red dot lines on the screen.
POINT :
The part of left side of waveform (entrance side) is adjusted by height of S1 post and the part of right side of
waveform (exit side) is adjusted by height of T1 post.
Lower part of above waveform of figure displays lead of Cylinder.
When the post driver is removed from upper part of post, linearity waveform may be changed.
After finishing this adjustment, eject the tape and insert the tape again to confirm the shape of linearity waveform
isn't changed.
7.
After finishing the Linearity Adjustment, measure the numerical value of linearity and waving.
µ
m, Waving : less than 1.5
TP6701 RF/CUE
TP233 SERVO (F1)
TG6001 RF/CUE
MECH-27
µ
m
Adjust linearity
into this area
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