Panasonic PT-53X54J Service Manual page 54

4. Adjust DAC "BRIGH" data so that bar 1 becomes near black like
bar 0.
5. Apply an HD 1080i signal and repeat this adjustment for HD 1080i
mode.
6. To check ABL apply a white pattern and put user bright control
(BRIGHTNESS in Picture menu) control to max. and confirm that
reading on meter is 12.7 ± 0.8V.
17.10. Individual ABL Check (I-ABL)
Procedure:
1. In PICTURE menu set the picture to "NORMAL".
2. Apply a pure blue flat signal from a signal generator or another
source.
3. In service mode select "I-ABL" DAC from service menu.
4. Confirm that the 3 hex values that appear on screen (below the "I-
ABL" label) are close to 0, i.e. "00 00 00"
5. If the "I-ABL" values differ too much from 0, repeat bright and ABL
adjustment again.
17.11. Red, green & blue screen Cut-Off
1. Use either a no input signal condition or raster from the NTSC
generator.
2. Observing the green tube directly or via a reflective surface, adjust
the VR on focus pack for the green tube for minimum noise.
3. Adjust the noise level in the red and blue tubes to match the noise
level in the green tube.
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