Panasonic CT-27D10UB Service-Handbuch - Seite 25

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Panasonic CT-27D10UB Service-Handbuch
Service Adjustments (Electronic Controls, cont.)

Color Temperature Adjustment

(B/W Tracking)
Serviceman DAC Adjust. (C0) (C1) (C2) (C4) (C5)
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 (C0)
RED, (C1) GRN, (C2) BLU and adjust the picture
for gray.
2. HIGH LIGHT areas – In Serviceman Mode for
making electronic adjustments, select Drive (C4)
GRN, (C5) 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 C1-1 (CRT-Board).
2. In Serviceman
Mode for
adjustment, select the Sub-Bright DAC (B2).
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 (B2) level until a scanning period of 2.5V
above DC ground is measured, as indicated in
Fig. 22.
Figure 22. TP35 Waveform
5. Connect the scope to RED Cathode (KR) on the
CRT-Board.
6. In the Serviceman Mode for making electronic
adjustments, select the RED CUTOFF DAC (C0).
7. Press the R-Tune key on the remote.
8. View scope trace at Horizontal rate and adjust the
9. Connect the scope to the GRN Cathode (KG).
10. In Serviceman
11. Press the R-Tune key on the Remote
12. View the scope trace and adjust the Serviceman
13. Connect the scope to the BLU Cathode (KB).
14. In Serviceman
15. Press the R-Tune key on the Remote.
16. View the scope trace and adjust the Serviceman
17. Turn the Screen Control (part of FBT) slowly
18. With the other two colors Serviceman Mode DAC
19. Confirm that a good gray scale is established by
making electronic
20. In the Serviceman Mode for making electronic
21. EXIT the Serviceman Mode.
22. Adjust the Picture Menu Video Adjustments Bright
23. If correction is needed: Re-Enter the Serviceman
2.5V DC
24. Perform Sub-Brightness Adjustment procedure if
0V DC
- 25 -
Serviceman Mode DAC (C0) level until a scanning
period of 195V above DC ground is measured, as
indicated in Fig. 23.
Mode for
adjustments, select the GRN CUTOFF DAC (C1).
Figure 23. Cathode Waveform, Adjustment
Waveform Detail
Mode DAC (C1) for the scanning period to be 195V
above DC ground. (See Fig. 23)
Mode for
adjustments, select the BLU CUTOFF (C2).
Mode DAC (C2) for the scanning period to be 195V
above DC ground. (See Fig. 23)
clockwise until a color horizontal line appears.
CUTOFF adjustments (C0) RED, (C2) BLU;
increase the colors to create a white horizontal line.
viewing B/W color bar pattern.
adjustments select the DAC DRIVE adjustments
(C4) GRN, (C5) BLUE and adjust for warm white in
a white color bar pattern.
and Picture from low scale to high scale and check
Black and White tracking.
Mode and perform the Minor Touch – Up Method.
needed.
making electronic
195V DC
0V DC
(Ground)
making electronic