S Board Adjustments - Sony TRINITRON PVM-8041Q Service Manual

PVM-8041Q/8044Q
S BOARD ADJUSTMENTS
—S BOARD (COMPONENT SIDE)—
1. Receive SECAM color-bar.
2. Bell Filter Adjustment (T1101)
(1) Connect an oscilloscope to IC1101 pin-®.
(2) Adjust T1101 (Bell Filter) so that the chroma waveform becomes
smooth. (Uneven level should be minimum.)
(1) Connect an oscilloscope to pin-® (R-Y) of CN1101 connector.
(2) Adjust LI 102 (R-Y) so that the non-colored portion level becomes
flat.
(3) Connect an oscilloscope to pin-® (B-Y) of CN1101 connector.
(4) Adjust LI 103 (B-Y) so that the non-colored portion level becomes
flat.
| DEMODU LATION LEVEL ADJUSTMENT (RV1101 ,RV1102)~]
1. Receive SECAM color-bar.
2. Connect an oscilloscope to IC124 pin-® (B-OUT).
3. Adjust S board RV1101 (SEC-COL) so that waveform peaks
should have the same level (most flat).
less than 20mV p-p
*
t
Li
(Adjust so that the first and the 4th
peaks should have the same level.)
4. Connect an oscilloscope to IC124 pin-® (R-OUT).
5. Adjust S board RV1102 (SEC-COL (R-Y)) so that the level
difference should be minimum.
(R-OUT)
less than 60mV
r
*
B
C
D
r
less than 20mV
(Adjust for B=D. [less than 20mV] Also level difference
between B and C should be less than 60mV.)
(5) When adjusting the color level of the unit to MAX or MIN using
the chroma adjusting knob, check that the white balance of the
colorless section does not change.
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