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Figure 38. TP47G waveform (B-W) only
5. Remove the jumpers (Preparation steps 4 & 5). Set
RGB Gamma register to "ON" (S3=1).
Tint/Color Adjustment
Service DAC Adjustment (B1) (B0)
Preparation:
1. Apply a rainbow color bar signal.
2. Preset the following controls:
• Brightness . . . . . . .Min.
• Color . . . . . . . . . . . .Center.
• Tint . . . . . . . . . . . . .Center.
• Picture. . . . . . . . . . .Max.
• Sharpness. . . . . . . .Min.
• y, ABL . . . . . . . . . . ."OFF"
3. Connect
(A-Board).
4. Connect a jumper from TPD2 to GND (
5.
Connect a jumper from IC101 pin 28 to GND (
Procedure:
1. In the Service Mode for making electronic
adjustments, select DAC Sub-Tint Adjustment
(B1). Adjust until the waveform measured is as the
one shown in Fig. 39.
TP47B (A-Board)
2. Connect the oscilloscope to TP47G (A-Board) or to
TP35.
3. Select DAC Sub-Color Adjustment (B0) and adjust
for peak-to-peak amplitude to be 0.9Vp-p ± 0.05V
as shown in Fig. 40.
TP47G (A-Board)
珍惜眼前人 搜集整理
2.8V
± 0.1V
p-p
1.0V - 1.5V
p-p
the
oscilloscope
probe
Figure 39. TP47B waveform
0.9Vp-p ± 0.05V
Figure 40. TP47G waveform
4. Remove the jumpers (Preparation steps 4 & 5).
Color Temperature Adjustment
(B/W Tracking)
Service DAC Adjust. (C0) (C1) (C2) (C3) (C4)
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 (C0) RED,
(C1) GRN, (C2) BLU and adjust the picture for
gray.
2. HIGH LIGHT areas – In Service Mode for making
electronic adjustments, select Drive (C3) RED,
(C4) 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 Service DACs for best results:
• C0 . . . . . . . . . . . . . 0 128
to
TP47B
• C1 . . . . . . . . . . . . . . . .64
• C2 . . . . . . . . . . . . . 0 128
).
• C3 . . . . . . . . . . . . . . . .64
).
• C4 . . . . . . . . . . . . . . . .64
1. Connect the oscilloscope to TP35.
2. In Service Mode for making electronic 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 Service Mode Sub-Bright DAC
(B2) level until a scanning period of 3.1V above DC
ground is measured, as indicated in Fig. 41.
5. Connect the scope to GRN Cathode (KG) on the
CRT-Board.
6. In the Service Mode for making electronic
adjustments, select the GREEN CUTOFF DAC
(C1).
7. Press the R-Tune key on the remote.
8. View scope trace at Horizontal rate and adjust the
Service Mode DAC (C1) level until a scanning
- 29 -
QQ:362399998
3.1V DC
Figure 41. TP35 Waveform
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