JVC DT-V2000SU Service Manual page 43

DT-V2000SU
DEFLECTION CIRCUIT COMMON ADJUSTMENT TO ALL SIGNALS
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HORIZONTAL SHIFT, HORIZONTAL SIZE
Test equipment Signal generator (Cross-hatch circle pattern)
Test points
Adjustment locations
DO03 ( H. SHIFT), DO01 (H. SIZE)
1. Input the VGA480 line cross-hatch circle pattern signal to
the input C terminal.
2. Switch to the INPUT C.
Escutcheon
,,
----.._
3. Adjust the 0003 to the horizontal center agree with the
/ "
~
I
\
screen center.
\
4. Adjust the 0001 so that the picture size falls within the place
___.
..._
of 10mm or more from both sides of the escutcheon.
10mm 10mm
\
I
\
'
/
/
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VERTICAL SHIFT, SIDE PIN, TRAPEZOID, PARALLELOGRAM, V LIN, BARREL
Test equipment
Signal generator(Cross-hatch circle pattern)
Test points
Adjustment locations DO04(V SHIFT), DO0S(SIDE PIN)
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DO07(PARALLELOGRAM), DO08(TRAPEZOID), DO09(BARREL)
DO10(V LINEARITY), DO11(V LINEARITY)
1. Input the cross-hatch circle pattern of the VGA480 line
cross-hatch circle pattern signal to the input C terminal.
2.Adjust the 0004 to vertical center of the input signal agree
with the CRT center.
___.
A
V
'
I
'\
D ..._
3. Adjust the 0005 to correct the side pin distortion.
I Ir. \
I \
4. Adjust the 0007 to correct the parallelogram distortion .
.I
E .._
5. Adjust the 0008 to correct the trapezoidal distortion.
___.
B
6. Adjust the 0009 to correct the barrel distortion.
\ I
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7. Adjust in the above steps to equalize the length of A~ F
\
1n
I
___. C
I'- ' /
F ..._
shown in the right figure. /
8. Then adjust the 0010 to equalize the length of the G and H.
9. Adjust the 0011 to equalize the length of the I, J and K .
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No.515198 27