Sony Trinitron PVM-5041Q Operating Instructions Manual page 34

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NTSC 4.43MHz COLOR DEMODULATION
ADJUSTME~T(RV108,RV112,RV103,RV106)
I.
NTSC4.43MHz- COLOR adjustment (RV 108,RVJ 12)
(I) Receive NTSC 4.43 color bar signal (75% color bar).
(2) ConneCt an oscilloscope to 1Cl24 pin-@ (B-OUT).
(3) AdjustRV108 (443NT-COL) so that waveform peaks should have
thesamelevel(mostflat),
(B-OUT) (Adjust so that the first and t~e 4th
peaks should ha Ye the same level.)
f
J1hmthancpp
(4) When cyan and magenta have level difference, adjust RVl 12
(443NT-HUE)andRV108(443NT-COL)alternativelytoremove,
by tracking.
(B-OUT}
When cyan and magenta have
level difference, adjust RV112
and RV108 alternatively to remove.
2. NTSC 4.43MHz- COLOR (R-Y) adjustment (RV103, RV106)
(1) Receive theNTSC4.43 color bar signal (75%,chromacolorbar).
(2) Connect an oscilloscope to the Q127 emitter (R-Y OUT), and
adjust RVI03(443NT-SH!FT) so that the output of the burst
sec.(ion (B-Y axis signal output) becomes 0.
(3) ConnectanoscilloscopetolC124pin-@(R-OUT).AdjustRV106
(443NT-illL (R-Y))so that the level difftrn1ceshould beminimum.
(A-OUT)
less than 60mV
(Adjust for B=D. [less than 20mV] Also level difference
between Band C should be less than 60mV.}
PAL COLOR DEMODULATION ADJUSTMENT
(RV113,RV2/SEP101, RV110,RV105,RV205)
I. PAL PHASE Adjustment (RVl 13,RV2/SEP101)
(1)
Receive the special PAL color-bar.
(2) Connect a~ oscilloscope to emitter of Q127 (R-Y OUT).
(3) Adjust RV113 (PAL-PHASE) so that B-Y (0/180°) and-PAL
portion (in the R-Y demodulated output) becomes "0" (flat) as
following figure.
(R-YOUT)
The anti-PAL portion ha,s a smauCT--
level difference in every other
horizontal period. So, adjust so
that average becomes "O".
(4) Connect an oscilloscope to emitter of Ql 28 {B-Y OUT).
(5) Adjust RV2 inside SEPIOI so that R-Y (90°/90°) anti-PAL
portion (in B-Y demodulated output) becomes "O" (tlat) as following
figure.
R-Y (90°/90°)
(B-YOUT) a+ti-PALsignal
n
Fl-
The anti-PAL portion has a small
level difference in every other
horizontal period. So, adjust so
that average becomes "O".
(
For the adjustm~nts of (3) and (5), it is also possible to set the color)
level to MAX with the chroma adjusting knob of the unit and erase
the color of the anti-pal signal section.
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