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iv) Here, preset the CHROMA VR, and adjust the
CHROMA PRESET VR as well as the HUE
PRESET VR on the FRONT PANEL to obtain
the normal R waveform ..
@
VR503 (D .. B-Y LEVEL)
i) Connect the probe to TP3(BK) on the CRT
SOCKET BOARD and adjust VR503(D .. B-Y
LEVEL) so that the waveform of B OUTPUT
can be the normal B signal.
(If
the HUE is wrong, adjust it with this B
OUTPUT.)
@ Wave form Check
i) Check to see that the waveforms at TPl(RK),
TP2(GK) and TP3(BK) on the CRT SOCKET
BOARD are respectively the normal R, G and B
signals.
ii) In addition, make sure that the clamp voltage of
pedestal is stable at each channel when turning
the CONTRAST VR MIN to MAX.
• TP2(GK waveform)
_
...
,
......
,
....
• TP3(BK waveform)
@
L306, VR303 (DL MATCH)
i)
Select the PAL COLOR BAR of VIDEO Band
preset the CHROMA and the HUE.
Then, connect the probe to TP3(BK) on the
CRT SOCKET BOARD and adjust the chroma
level and line crawling with VR303 and L306
(DL MATCH)
ii) Here, input the ANTI PAL signal and make sure
that the waveforms at TPl, TP2 and TP3 are the
waveforms shown below ..
At ANTI PAL
inputting
• TP1(RK)
• TP2(GK)
• TP3(BK)
(J) Waveform Check in inputting Y/C signal
i) Select Y/C after inputting the NTSC COLOR
BAR to the Y/C input. Next, make sure that
level of each cathode on the CRT SOCKET
BOARD is the same when inputting
the
COMPOSITE signal.
(7) Adjustments of VIDEO System-·Level Adjust-
ment of YPBPR Input
(D
VRlOl (R-Y LEVEL)
i) After Inputting NlO or YPBPR signal which
meets the SMPTE standard to R/R-Y, G/Y and
B/B-Y inputs, select AUX.
Next, set Sl(RGB -
YPBPR) to "YPBPR"
position and connect the probe to TPl(RK) on
the CRT SOCKET BOARD.
ii) When setting the CHROMA VR to MIN posi-
tion, adjust the spacing between
®
of 75%
white and @ to 2cm on the oscilloscope with its
UNCALknob.
iii) Next, adjust VRlOl(R-Y LEVEL) so that@ can
be 2cm to the plus(+) side toward
®
when
setting the CHROMA VR to MAX position.
- 9 ·-
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