Panasonic CT-27SL14 - 27" CRT TV, Service Manual

Page: 17 / 52

12.5.2. Vertical linearity(V-C), V-Size and
V-Position adjustment
PREPARATION
1. Apply a crosshatch pattern
2. Normalize the picture settings.
PROCEDURE
1. Enter service mode, select DAC adjustment
“V-POS” and adjust monoscope pattern to the
center vertical position of the CRT center mark.
2. Adjust linearity data “V-C” so that interval of “a” is
same as “b” (a=b).
3. If the v-position is not at the CRT center, adjust
V position “V POS” DATA again.
4. Apply a monoscope pattern.
5. Confirm that center horizontal line is in center mark
on CRT.
6. Adjust “VEAMP” register for correct vertical size by
making monoscope round circle leaving 4 marks off
the CRT edge.
Vertical centering adjustment.
12.5.3. V-S Correction adjustment
PREPARATION
1. Apply a crosshatch pattern
2. Normalize the picture settings.
PROCEDURE
1. Enter to service mode
2. Check a and b sizes, If b-a < -1.5mm (in top & bottom
extending case)
• • • • Increase “V-S” DATA by one step
NOTE
Repeat “a” and “b” until b-a ± 1.5mm
3. Confirm to make outermost circle of monoscope pattern
a correct circle
V-Adjustment
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