Sony TRINITRON PVM-8041Q Service Manual page 27

PVM-8041Q/8044Q
2. 4.43MHz VXO adjustment (CV102)
(1) Receive PAL colour bar signal.
(2) Connect +12V power line to 1009 pin-©.
(3) Connect frequency counter to 1013 pin-®. Adjust CV102
(443FO) for 4433619±20Hz.
(This adjustment can be alternatively done by observing screen as
below.)
Adjust colour synchronization by CV102(443FO).
Adjust so that colour stripes
disappear and the hue
change is stabilized extremely.
NTSC COMB FILTER ADJUSTMENT
(RV1,T1/CFM101 BOARD)
1. Receive NTSC 3.58 color bar signal.
2. Connect an oscilloscope to C202 - negative side.
3. Confirm the Y OUT is 0.78:10.5 Vp p.
4. Confirm the residual chroma is 32 m Vp-p below. If it is above 35
mVp p, adjust with RV1 andTl onCFM201 board while tracking.
2. NTSC 3.58MHz - COLOR adjustment (RV111)
(1) Receive NTSC 3.58 color bar signal.
(2) Connect an oscilloscope to 1024 pin-® (B-OUT).
(3) Adjust RV111 (358NT-COL) so that waveform peaks should have
the same level (most flat).
(Adjust so that the first and the 4th
' "OU ' peaks should have the same level.)
*
less than
ji 20mV p-p
3. NTSC 3.58MHz - COLOR (R-Y) adjustment (RV104, RV107)
(1) Receive the color bar signal.
(2) Connect an oscilloscope to the Q127 emitter (R-Y OUT), and
adjust RV104 (358NT-SHIFT) so that the output of the burst
section (B-Y axis signal output) becomes 0.
(3) Connect an oscilloscope to IC124 pin-® (R-OUT). Adjust RV 107
(358NT-COL (R-Y)) so that the level difference should be
minimum.
(R-OUT)
(Adjust for B=D. [less than 20mV] Also level difference
between B and C should be less than 60mV.)
NTSC COLOR DEMODULATION ADJUSTMENT
(RV114,RV111 ,RV104,RV107)
1. NTSC 3.58MHz - HUE adjustment (RV114)
(1) SupplyNTSCcolorbarsignalincludingburstandR-Ycomponent.
(For example, Tektronix 1410SG output color bar signal with B-
Y component removed.)
(2) Connect an oscilloscope to Q128 emitter (B-Y OUT).
(3) Adjust RV114 (358NT - HUE) so that all the waveform peaks
should have equal amplitude (look flat) except burst (Level
difference should be less than lOmV p-p.)
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