45
CONTRAST ADJUSTMENT (HDTV)
Notes: • Perform the following adjustments after completing the
Screen Voltage adjustment.
• Set the CONTRAST data in the Setup Menu to “00”.
• The value adjusted at the SO 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.
• When overscan data of a signal is changed, it is required
to re-adjust the underscan data of the same adjustment
signal.
— Standard value (SO) 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 SO01 in the Service Menu to set the voltage amplitude <A>
in the figure on the right to 30 V ± 2 V.
— 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 30 V ± 2 V.
9. Set the UNDER SCAN button on the front panel to ON so that the
scanning size is set to underscanning.
10. Adjust SM25 to set the voltage amplitude <A> to 30 V ± 2 V.
11. Press the UNDER SCAN button on the front panel to set the
underscan to OFF.
12. Vary the adjustment signal and adjustment data, and re-perform
adjustments in steps 5 to 11 above (see Table 1).
SIGNAL CONTRAST ADJUSTMENTS
1 Vertical interval
(V. sync)
<A>
30V ± 2V
Adjustment Signal Scanning Size Adjustment Data
COMMON
Overscan SO01
Underscan —
1080/60i
Overscan SI01
Underscan SM25
1080/24pSF
Overscan SJ01
Underscan SM28
720/60p
Overscan SK01
Underscan SM31
Table 1
Measuring Instruments Signal generator (Crosshatch signal)
Oscilloscope
Card (Slot) Component/RGB Input Card (Slot 1)
Test Points TP-47G [CRT SOCKET PWB]
TP-GND [CRT SOCKET PWB]
Adjustment Points S*01 (Overscan Contrast), SM** (Underscan Contrast) [Service Menu]
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