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Procedure:
1.
Connect the oscilloscope to TPY1.
2.
Apply a color bar signal in main and PIP (PIP on).
3.
In the Serviceman Mode for making electronic
adjustments, select the DAC adjustment (P03) for
PIP Sub-Subcontrast so that child (PIP) level is
90% of parent (MAIN) signal (See Fig. 29)
Color Temperature Adjustment
(B/W Tracking)
Serviceman 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 Serviceman Mode for
making electronic adjustments, select Cutoff (C00)
RED, (C01) GRN, (C02) BLU and adjust the
picture for gray.
2.
HIGH LIGHT areas – In Serviceman 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 10 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 Serviceman DACs for best results:
• C0 . . . . . . . . . . . . . . 128
• C1 . . . . . . . . . . . . . . 128
• C2 . . . . . . . . . . . . . . 128
• C4 . . . . . . . . . . . . . . . 64
• C5 . . . . . . . . . . . . . . . 64
1.
Connect the oscilloscope to TP37 (L-Board).
2.
In Serviceman Mode for making electronic
adjustment, 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 Serviceman Mode Sub-Bright
DAC (B02) level until a scanning period of
2.3±0.05V above DC ground is measured, as
indicated in Fig. 30.
5.
Press the R-Tune key on the remote.
6.
Connect the scope to RED Cathode (KR) on the
CRT-Board.
7.
In the Serviceman Mode for making electronic
adjustments, 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
Serviceman Mode DAC (C00) level until a
scanning period of 170±2V above DC ground is
measured, as indicated in Fig. 31.
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 Serviceman Mode for making electronic
adjustments 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. EXIT the Serviceman Mode.
A
Ax0.9
Figure 29. Waveform
0V DC
Figure 30. TP35 Waveform
2.3±0.05V DC
Figure 31. KR Waveform
170±2V DC
0V DC
(Ground)
