Analog Video Sub-Contrast Adjustment - Sony TRINITRON KD-34XBR2 Service Manual

7-3. ANALOG VIDEO SUB-CONTRAST
ADJUSTMENT
SET-UP CONDITION:
Picture mode: PRO
Color: Minimum
Picture: Maximum
Display mode: FULL
INITIAL DATA:
Cat. 2150P-1, item #4 "RDRV", data = 45.
Cat. 2150P-1, item #7 "RCUT", data = 41.
PROCEDURE:
1. With set turned off, connect an oscilloscope to pin # 1 (R) of CN9001
on the C-board.
2. Enter the service mode.
3. Display a color bar pattern through the video-1 input.
4. Select adjustment category "2150P-2", item # 1 "RGBS", and change
the data from 7 to 4 (this turns off the blue and green).
5. Select adjustment category "2150P-4", item # 0 "SCON", and change
the data so that the voltage difference between the peak white level
and black level is 2.25 V +/- 0.05 V for 100 IRE color bars, or 1.7 V +/-
0.05 V for 75 IRE color bars.
50mv/div.
5uS/div.
VR1
100 IRE color bars
VR1 – VR2 = ∆ VR = 2.25 V ± 0.05 V
75 IRE color bars
VR1 – VR2 = ∆ VR = 1.7 V ± 0.05 V
6. Write the data to memory.
7. Select adjustment category "2150P-2", item # 1 "RGBS", and change
the data from 4 to 7 (this turns the blue and green on).
This completes the analog video sub-contrast adjustment.
White
Black
VR2
p-p
p-p
7-4. ANALOG VIDEO SUB-COLOR AND SUB-
HUE ADJUSTMENT
SET-UP CONDITION:
Picture mode: PRO
Color: Factory default (press the RESET button while in PRO mode
adjustment menu).
Picture: Maximum
Display mode: FULL
INITIAL DATA:
Cat. 2150P-1, item #4 "RDRV", data = 45.
Cat. 2150P-1, item #7 "RCUT", data = 41.
PROCEDURE:
1. With set turned off, connect an oscilloscope to pin # 5 (B) of CN9001
on the C-board.
2. Enter the service mode.
3. Display a color bar pattern through the video-1 input.
4. Select adjustment category "2150P-4", item # 1 "SCOL", and adjust the
data so that VB1 and VB4 in the waveform meets the spec. shown
below.
5. Select adjustment category "2150P-4", item # 2 "SHUE", and adjust
the data so that VB2 and VB3 in the waveform meets the spec. shown
below.
50mv/div.
5uS/div.
VB1 VB2 VB3 VB4
SCOL: VB1 ≤ VB4 (=VB1 + 0 ~ 90mV)
SHUE: VB2 ≤ VB3 (=VB2 + 0 ~ 90mV
6. Write the data to memory.
This completes the analog video sub-color and sub-hue
adjustment.
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KD-34XBR2