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ii) Input the COLOR BAR (BURST, CHROMA:
OFF)
or the
WINDOW
signal
(BURST,
CHROMA : OFF) to the R/PR input.
iii) Input the external SYNC signal and select EXT.
SYNC.
iv) Connect the probe to TPl(RK) inside the CRT
SOCKET BOARD and adjust VR601(R GAIN)
so that the white area of 100% can be 50Vp-p
when setting
CONTRAST VR to "MAX"
position ..
• TP1(RK)
X
• at CONT MAX
X=50Vp-p with 14, 20inch
• at CONT PRESET
14inch
X=35Vp-p
20inch
X=40Vp-p
j
-1
00% WHITE LEVEL
v) Preset CONTRAST and adjust the white area of
100% to 35Vp-p(40Vp-p) with the CONTRAST
PRESET VR in this stage.
(In the last stage, it
is to be adjusted to 120cd/ m
2
with a luminance
meter.)
@
VR104 (Y CLP .. LEVEL)
VR103 (Y. LEVEL)
i) Input the COLOR BAR(BURST, CHROMA
OFF) signal to the G/Y input and set Sl(RGB
-
YPBPR selector switch) on the VIDEO
BOARD to
"YPsPR"
position.
ii) Preset CONTR~ST as well as BRIGHTNESS
and connect the probe to TP102(GND : TP104),
then adjust VR104(Y CLP. LEVEL) until the
level at back porch part of waveform matches
the pedestal line.. (Range of an oscilloscope:
50mv/div, 10µ sec/div)
• TP102{Y waveform)
Adjustment of CLAMP LEVEL
\~
Back porch
- 7 -
iii) Connet the probe to TPl(RK)
on the CRT
SOCKET
BOARD
and adjust VR103 (Y.
LEVEL) until the white area of 100% reaches
35Vp-p.
(BRIGHTNESS, CONTRAST : PRESET)
@ L201 (N. TRAP)
L301(P. TRAP)
i) Input the NTSC SMPTE COLOR BAR signal to
VIDEO A input terminal and input the PAL
EBU COLOR BAR signal to VIDEO B input
terminal.
ii) Connect the probe to TP102 at a V rate, select
VIDEO A, and set the COMB/fRAP switch on
the FRONT PANEL to
"TRAP"
position.
Then, magnifying the non-correlative portion
between the scanning lines, that is, portion
where color changes in the vertical direction,
adjust L201(N TRAP) so that the carrier leak on
the portion can be minimized.
iii) Select VIDEO B and adjust L301(P TRAP)
until the carrier leak is minimized.
• TP102{Y waveform)
SUB CARRIER Leak
Magnifying
. .
.
.. .. . .
r• ./
Adjust so that the sub carrier leak
/\v~f\J.
.
>
on this portion can be minimized,
@ VR202 (COMB Y LEVEL)
VR301 (PAL Y LEVEL)
i) Input the NTSC COLOR BAR to VIDEO A and
input the PAL COLOR BAR to VIDEO B.
Then, connect the probe to TPl(RK) on the
CRT SOCKET BOARD.
After
selecting
VIDEO
A, adjust
VR202
(COMB Y LEVEL) so that the white area of
100% can be 35Vp-p.
In the case of selecting VIDEO B, adjust
VR301(PAL Y LEVEL) in a similar way.
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