Focus Adjustment - Sony Trinitron KV-21FT250 Service Manual

Convergence Rough Adjustment
Before performing this adjustment, perform Horizontal and Vertical Static
Convergence Adjustment.
Input cross hatch pattern.
a) TLH
Adjust the horizontal convergence of red and blue dots by inserting
TLH Correction Plate to the DY pocket (left or right).
b) YCH
Adjust YCH to balance Y axis.
c) TLV
Adjust YCh to balance Y axis.
d) XCV
Adjust XCV to balance X-axis.
R B R B
TLH YCH
ON DY:
YCH
TLV
XCV
DY pocket
KV-21FT250
B
R
R
B
TLV
TLV
DY pocket
TLH Plate
XCV
Screen Corner Convergence Adjustment
Affi x a Piece A (90), Convergence Correct/Permaloy Assy Correction to
the misconverged areas.
XCV
a1~d1:Piece A (90), Convergence Correct

3-3. FOCUS ADJUSTMENT

FOCUS adjustment should be completed before White Balance
adjustment. (See 4-4. White Balance Adjustment)
1. Receive digital monoscope pattern.
2. Set Picture Mode to "DYNAMIC".
3. Adjust focus VR to obtain a just focus at the center of the screen.
4. Change the receiving signal to white pattern and blue back.
5. Confi rm magenta ring is not noticeable. In case magenta ring is
obvious, then adjust FOCUS VR to balance magenta ring and
FOCUS.
b
a-d : screen-corner
misconvergence
c
a1
d1
or
c1
Permaloy Assy Correction
FOCUS
SCREEN
KV-21FT250
a
d
b1
22