Contrast Adjustment - JVC DT-V1710CG Service Manual

4.10.8 CONTRAST ADJUSTMENTS
CONTRAST ADJUSTMENT (HDTV)
Measuring Instruments
Card (Slot)
Test Points
Adjustment Points
Notes:
•
Perform the following adjustments after completing
the Screen Voltage Coarse adjustment.
•
Set the CONTRAST data in the Setup Menu to "00".
•
The value adjusted at the SR 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.
– Standard value (SR) adjustment –
(1) Apply the 1080/60i 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 SR01 in the Service Menu to set the voltage
amplitude <A> in the figure on the right to the voltage
shown in the Table 1.
– Other signals adjustments –
(5) Apply the 1080/60i crosshatch signal to INPUT A (Terminal
Y on the Component/RGB Input Card).
(6) Set the CONTRAST potentiometer on the front panel to
the center click position.
(7) Connect the oscilloscope across TP-47G and TP-GND.
(8) Adjust SI01 in the Service Menu to set the voltage
amplitude <A> in the figure on the right to the voltage
shown in the Table 1.
(9) Vary the adjustment signal and adjustment data, and
re-perform adjustments in steps 5 to 8 above (see Table
1).
1-48 (No. 52152)
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>
COMMON(1080/60i)
1080/60i SI01
1080/50i SK01
1080/24spF SL01
720/60p SM01
720/50p SN01
Table 1
SR1 30 V ± 2 V
30 V ± 2 V
32 V ± 2 V
33 V ± 2 V
32 V ± 2 V
32 V ± 2 V