Panasonic AJSDX900P - 24P DVCPRO 50, Service Manual

Page: 71 / 421

MECH-30
1-33. LISTA Linearity Adjustment and Waving Measurement
SPEC Linearity : less than 3um, Waving : less than 1.5um
TEST POINT
ADJ. MODE
Refer to item “6. Table of Test Point for each adjustment item.”.
Click this button , then go to item “6. Table of Test Point for each adjustment item.”.
ADJUST S1 and T1 Post Height
TOOL VFK1149B (Post Driver)
SD 25M VTR PLAY (25M mode)
SD 50M VTR & CAM PLAY (25M and 50M mode)
VTR MODE
HD CAM PLAY (HD LP mode)
SD VTR & CAM NTSC: VFM3581KM(LISTA), PAL: VFM3681KM(LISTA)
TAPE
HD CAM VFM3781KML(LISTA)
1. Please adjust each items by following the flow chart to perform the LISTA adjustment. SD 50M model is
required adjustment by 25M and 50M mode. HD model is required adjustment by HD LP mode.
2. SD 50M model is required setting on LISTA software and unit to select 25M or 50M mode. 25M and 50M mode
can be changed by press “0” key on LISTA main menu about LISTA software. Please refer to item “6. Table of
Test Point for each adjustment item.” about how to select 25M and 50M mode in the Unit.
3. Set the adjustment mode.(Please refer to item “6. Table of Test Point for each adjustment item.” about how to
set adjustment mode).
Click this button , then go to item “6. Table of Test Point for each adjustment item.”.
4. Connect the each clips of LISTA cable to the test point.
5. Playback the LISTA Alignment Tape.
6. Select the item “<2> Linearity Measurement” on the LISTA main menu, and then linearity waveform appears on
the screen.
7. 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.
8. After finish the Linearity Adjustment, measure the numerical value of linearity and waving.
Adjust linearity
into this area
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 of Cylinder.
When the post driver is removed from upper part of post, linearity waveform may be changed.
After finish this adjustment, eject the tape and insert the tape again to confirm the shape of linearity waveform
isn’t changed.