JVC DT-V1710CG Service Manual page 49

CONTRAST ADJUSTMENT (SDTV)
Measuring Instruments
Card (Slot)
Test Points
Adjustment Points
Notes:
•
Perform the following adjustments after completing
the 1080/60i signal Contrast adjustment.
•
Set the CONTRAST data in the Setup Menu to "00".
•
The SR value (see the description of the HDTV
Contrast Adjustment) becomes the reference value
for the following adjustments. When this data is
changed, it is required to re-adjust the data of all of
the adjustment signals (HDTV, SDTV and NTSC/PAL).
When re-adjusting the 1080/60i signal, use the SI.
(1) Apply the 480/60i crosshatch signal to INPUT A (Terminal
Y on the Component/RGB Input Card).
(2) Set the CONTRAST potentiometer on the front panel to
the center click position.
(3) Connect the oscilloscope across TP-47G and TP-GND.
(4) Adjust SE01 in the Service Menu to set the voltage
amplitude <A> in the figure on the right to the voltage
shown in the Table2.
(5) Vary the adjustment signal and adjustment data, and re-
perform adjustments in steps 1 to 4 above (see Table 2).
Signal generator (Crosshatch signal)
Oscilloscope
Component/RGB Input Card (Slot 1)
TP-47G [CRT SOCKET PWB]
TP-GND [CRT SOCKET PWB]
S*01 (Contrast) [Service Menu]
(V. sync)
1 Vertical interval
<A>
Adjustment Signal Adjustment Data Adjustment Voltage <A>
480/60i SE01
576/50i SF01
480/60p SG01
576/50p SH01
Table 2
36 V ± 2 V
36 V ± 2 V
35 V ± 2 V
35 V ± 2 V
(No. 52152) 1-49