Picture Quality Adjustments; Dtv Sub-Contrast Adjustment; Dtv Sub-Color And Sub-Hue Adjustment - Sony TRINITRON KD-34XBR2 Service Manual

Perform these adjustments as necessary.
REQUIRED EQUIPMENT: NTSC generator with 100 IRE 100% color bar pattern or 75 IRE 75% color bar pattern (composite video and RF output).
NOTE: Throughout these adjustment procedures you will be instructed to "Write the data to memory". To do this, follow this procedure:
1. Press the "MUTE" button ("WRITE" appears in green letters at the top right corner of the screen).
2. Press the "ENTER" button ("WRITE" changes from green to red, then "WRITE" changes to "SERVICE").

7-1. DTV SUB-CONTRAST ADJUSTMENT

SET-UP CONDITION:
Picture mode: PRO
Color: Minimum
Picture: Maximum
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. Display the 1080i color bar pattern from the TV's internal pattern
generator as follows:
a) Turn the set on and select the VHF-UHF antenna.
b) Tune the TV to channel 2.1 ("two point one" not "twenty one").
Use the decimal point button on the remote. It's OK if there is
no signal on channel 2.1.
c) Turn the TV off.
d) Enter the service mode.
e) Select adjustment category "DTV"
f) Select adjustment item # 1 "PATN".
g) Change the data from "0" to "4". The 1080i color bar pattern will
appear in a few seconds. The 1080i pattern automatically forces
the TV into the FULL mode.
3. Select adjustment category "2150P-2", item # 1 "RGBS", and change
the data from 7 to 4 (this turns off the blue and green).
4. 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.
White
50mv/div.
5uS/div.
VR1
VR2
VR1 – VR2 = ∆ VR = 2.25 V ± 0.05 V
5. Write the data to memory.
SECTION 7. PICTURE QUALITY ADJUSTMENTS
Black
p-p
6. 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 DTV sub-contrast adjustment.
7-2. DTV 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
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. Display the 1080i color bar pattern from the TV's internal pattern
generator (refer to section 7-1. item 2).
3. 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.
4. 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.
SCOL: VB1 ≤ VB4 (=VB1 + 0 ~ 90mV)
SHUE: VB2 ≤ VB3 (=VB2 + 0 ~ 90mV
5. Write the data to memory.
This completes the DTV sub-color and sub-hue adjustment.
— 28 —
VB1 VB2 VB3 VB4
KD-34XBR2