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PIP Sub-Contrast Adjustment (P03)
Procedure:
1. Connect the oscilloscope to TPY1.
2. Apply a color bar signal in main and PIP (PIP on).
3. In the Service Mode, select the DAC adjustment
(P03) for PIP Sub-contrast so that child (PIP) level
is 90% of parent (MAIN) signal (See Fig. 27)
A
Figure 27. Waveform
Color Temperature Adjustment
(B/W Tracking)
Service DAC Adjust.
(C00) (C01) (C02) (C04) (C05)
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 Cutoff (C00) RED,
(C01) GRN, (C02) BLU and adjust the picture for
gray.
2. HIGH LIGHT areas – In Service Mode for making
electronic adjustments, select Drive (C04) GRN,
(C05) BLU and adjust the picture for warm whites.
Complete Adjustment
Preparation:
1. Turn the Receiver "ON" and allow 30 minutes
warm up at high brightness.
2. Apply a color bar signal with color "OFF".
3. Turn the SCREEN control (part of FBT T551) fully
counterclockwise.
Procedure:
Preset the following Service DACs for best results:
• C0 . . . . . . . . . . . . . . 128
• C1 . . . . . . . . . . . . . 128
• C2 . . . . . . . . . . . . . . 128
• C4 . . . . . . . . . . . . . . 64
• C5 . . . . . . . . . . . . . . 64
1. Connect the oscilloscope to TPL1 (C-Board).
2. In Service Mode, select the Sub-Bright DAC (B02).
3. Press the R-Tune key on the remote.
4. Observe the oscilloscope waveform at Horizontal
rate and adjust the Service Mode Sub-Bright DAC
(B02) level until a scanning period of 2.4V above
DC ground is measured, as indicated in Fig. 28.
5. Press the R-Tune key on the remote.
Ax0.9
6. Connect the scope to RED Cathode (KR) on the
CRT-Board.
7. In the Service Mode, select the RED CUTOFF
DAC (C00).
8. Press the R-Tune key on the remote.
9. View scope trace at Horizontal rate and adjust the
Service Mode DAC (C00) level until a scanning
period of 170V above DC ground is measured, as
indicated in Fig. 29.
10. Press the R-Tune key on the remote.
11. Write the same C00 data to C01 and C02.
12. Press the R-Tune key on the remote.
13. Turn the Screen Control (part of FBT) slowly
clockwise until a slightly color horizontal line
appears.
14. Adjust DAC C01 and C02 until the horizontal line
becomes white.
15. Press the R-Tune key on the Remote
16. In the Service Mode select the DAC DRIVE
adjustments (C04) GRN, (C05) BLUE and adjust
for warm white in a white color bar pattern.
17. Apply a monoscope pattern and check for a good
picture.
18. Perform Minor Touch-Up Method if necessary.
19. EXIT the Service Mode.
- 31 -
2.4V DC
Figure 28. TPL1 Waveform
170±2V DC
0V DC
Figure 29. KR Waveform
0V DC
(Ground)
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