Color Temperature Adjustment (B/W Tracking); Complete Adjustment - Panasonic CT-32SX31E Service Manual

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)
A
Figure 29. Waveform
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
adjustment, select the Sub-Bright DAC (B02).
3. Press the R-Tune key on the remote.
Ax0.9
for making electronic
- 28 -
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.
Figure 30. TP35 Waveform
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
Figure 31. KR Waveform
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.
2.3±0.05V DC
0V DC
170±2V DC
0V DC
(Ground)