16.8 Color temperature adjustment
(B/W Tracking)
Service DAC Adjust.
(CUT R) (CUT G) (CUT B) (R DR) (B DR)

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Minor Touch-Up Method

OBSERVE low and high brightness areas of a B/W picture for proper tracking. Adjust only as required for “good gray scale and warm highlights”.

  1. LOW LIGHT areas - In service mode for making electronic adjustments, select CUT R, CUT G, CUT B and adjust the picture for gray.

  2. HIGH LIGHT areas - In service mode for making electronic adjustments, select drive R DR, B DR and adjust the picture for warm whites.

Complete adjustment

PREPARATION

  1. Turn the receiver “ON” and allow 30 minutes warm up at WHITE PATTERN.

  2. Apply a color bar pattern (with no color).

  3. Turn the SCREEN control (part of FBT T551) fully counterclockwise.

  4. Preset the following service DACs for best results:

    • BRIGH______________________1 D0

    • CUT R______________________0 00

    • CUT G______________________1 80

    • CUT B______________________0 00

    • R DR_______________________80

    • B DR_______________________80

    • PICTURE SETTINGS__________NORMALIZED

    • PICTURE MODE______________VIVID

PROCEDURE

  1. Connect the oscilloscope to KG (CRT-Board).

  2. In service mode for making electronic adjustment, select “BRIGH” DAC.

  3. Press RECALL button on the remote control to collapse the raster. (service SW).

  4. Connect oscilloscope to KG on L-Board and adjust service mode “CUT-G” DAC until 170±2V above DC ground is measured

  5. Remove the probe from KG.

  6. Turn screen clockwise slowly until color is slightly appeared.

  7. Then adjust “CUT R” and “CUT B” until line becomes white.

  8. Press RECALL button on the remote to restore the raster.

  9. Adjust “R DR” and “B DR” so the white seems like white and black like black

  10. Apply a normal signal and confirm that the image is normal and a good gray scale

  11. If correction is needed perform minor touch-up method.

    NOTE

    This adjustment (NTSC) will adjust automatically 480p and 1080i formats, no need to adjust for these formats


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