Rf Sub-Contrast Adjustment; Analog Video Sub-Color And Sub Hue Adjustment - Sony TRINITRON KD-34XBR2 Service Manual

7-5. RF SUB-CONTRAST ADJUSTMENT

SET-UP CONDITION:
Picture mode: PRO
Color: Minimum
Picture: Maximum
Display mode: TWIN mode (P&P)
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 an RF (tuner) 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 "2103-1", item # 2 "SCON" (for the left side
picture) and "2103-2", item # 2 "SCON" (for the right side picture), 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.
White
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 RF sub-contrast adjustment.
Black
VR2
p-p
p-p
— 30 —
7-6. 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: TWIN mode (P&P)
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 an RF (tuner) input.
4. Select adjustment category "2103-1", item # 3 "SCOL" for the left side
picture, and "2103-2", item # 3 "SCOL" for the right side picture, and
adjust the data so that VB1 and VB4 in the waveform meets the spec.
shown below.
5. Select adjustment category "2103-1", item # 4 "SHUE" for the left side
picture, and "2103-2" item # 4 "SHUE" for the right side picture, 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 RF sub-color and sub-hue adjustment.
KD-34XBR2