B Board Adjustments; Primary Color Matrix Adjustment (1) (Rv115); Primary Color Matrix Adjustment (2) (Rv116, Rv123) - Sony TRINITRON PVM-8042Q Service Manual

5-2. B BOARD ADJUSTMENTS

2
IC109
8 1
IC106
RV102
10 16
RV101
CN104
5-2-1. Primary Color Matrix Adjustment (1)
(RV115)
Input signal: Component color bars signal
(75 % chroma color bars signal)
Switches: UNDER SCAN 8 Pull (OFF)
16 : 9
SYNC INT/EXT 8 EXT
LINE/RGB
1. Supply a sync signal from the test signal generator to
EXT SYNC IN connector of the rear panel.
2. Supply Y signal and R-Y signal from the test signal
generator to RGB/COMPONENT connector of the rear
panel.
3. Connect an oscilloscope to pin 30 (B OUT) of IC124.
4. Adjust RV115 (SUB HUE) to minimize (15 mVp-p or
less) the B signal level.
IC124
PIN-30
5-4
RV121 RV120
RV119 RV122
RV118 RV115
RV205 RV116
CFM101
+ _
C202
T1
RV1
0 ![
CN101
B Board Adjusting Components Location
8 Pull (4 : 3)
8 RGB
Minimum
(15 mVp-p or less)
IC124
RV125
RV123
$-
RV124
#;
#/
@]
SEP101
RV2
RV103
RV104
RV107
RV105 RV106
5-2-2. Primary Color Matrix Adjustment (2)
(RV116, RV123)
Input signal: Component color bars signal
(75 % chroma color bars signal)
Switches: UNDER SCAN 8 Pull (OFF)
16 : 9
SYNC INT/EXT 8 INT
LINE/RGB
1. Supply Y, R-Y, and B-Y signals from the test signal
generator to RGB/COMPONENT connectors.
2. Connect an oscilloscope to pin 30 (B OUT) of IC124.
3. Adjust RV116 (SUB COL) to minimize each peak level
(20 mVp-p or less). Adjust so that the 1st and the 4th
peaks should have the same level.
IC124
PIN-30
4. Connect an oscilloscope to pin 41 (R OUT) of IC124.
5. Adjust RV123 (MATRIX R-Y) so that the level
difference of R signal is shown below.
Specification:
Level difference of B and D = Minimum (20 mV or less)
Level difference of B and C = Minimum (30 mV or less)
A
IC124
B
PIN-41
RV111
RV108
RV110
RV114
RV112
RV113
RV109
!; 1
Q127
IC113
E
@- @; #/
Q128 E
8 Pull (4 : 3)
8 RGB
20 mV or less
30 mV or less
C
D
20 mV or less
MIC
S Chassis