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3.-Sub Contrast adjustment (AVC Center)
This adjustment is only necessary if picture contrast seems to be
deficient, memory initialization was done without making a note
of the settings, or if the IC I001(main micon) or I003 (EEPROM)
were changed.
Adjustment codes to be used
SUB CONTRAST(M) **
Main picture sub-contrast adjustment code
SUB CONTRAST(S)
**
Sub picture sub-contrast adjustment code
Adjustment signal to be used
RF input NTSC
100% White raster
100 IRE video level = 0.714Vdc
40 IRE sync level = -0.286Vdc
No setup voltage
Black level = 0Vdc
Adjustment equipment
40MHz minimum bandwidth Oscilloscope with probe
Adjustment point location
FC/MSC
module
PSY
P50FP
Adjustment preparation
1. Remove the 7 screws from the top cover case.
2. Turn on the TV set for at least 20 minutes before the
adjusment.
3. After the 20 minutes heat-run, turn off the PDP TV set, remove
the AVC20 top cover and turn the set back on by activating the
adjustment mode (Check page 30). Press MENU key once after
activating the Adjustment Mode to reach the sub-contrast codes.
4. Input the RF adjustment signal through antenna A
(Recommended channels, VHF 03 or 04)
5. Connect the oscilloscope probe to the 5th pin if sub-picture
adjustment, or 1st pin if main picture adjustment of PSY or PSY2
free connector terminals in the AV PWB. You can reach this
adjustment points by entering the probe between the FC/MSC
module and the U102 tunner unit.
6. Set SPLIT PIP mode with the remote control and receive the
adjustment signal in both pictures, main and sub.
BACK TO ADJUSTMENTS
AV PWB
PSY2
Adjustment procedure
1. Set the oscilloscope to display one horizontal period.
2. Adjust the amplitude of the signal with SUB CONTRAST(_)
code value, to have 1.38Vdc between black level and white level.
0V
46
PT2-E/G AVC1-U
1.38Vdc
1H
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