JVC DT-V1710CG Service Manual page 50

CONTRAST ADJUSTMENT (NTSC/PAL VIDEO)
Measuring Instruments
Card (Slot)
Test Points
Adjustment Points
Notes:
•
Ensure that the output waveforms from the NTSC/
PAL Video Input Cards are normal before proceeding
to the following adjustments.
•
Perform the following adjustments after completing
the 1080/60i signal Contrast Adjustment.
•
Set the CONTRAST data in the Setup Menu to "00".
•
The SO 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. (For
the adjustment of the 1080/60i signal, use the
Component/RGB Input Card.)
(1) Apply the NTSC crosshatch signal to INPUT C (Terminal
VIDEO1 on the NTSC/PAL Video 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 SA01 in the Service Menu to set the voltage
amplitude <A> in the figure on the right to the voltage shown
in the Table 3.
(5) Vary the adjustment signal and adjustment data, and re-
perform adjustments in steps 1 to 4 above (see Table 3).
1-50 (No. 52152)
Signal generator (Crosshatch signal)
Oscilloscope
NTSC/PAL Video Input Card (Slot 2)
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>
NTSC (VIDEO) SA01
PAL (VIDEO) SC01
Table 3
36 V ± 2 V
36 V ± 2 V