Toshiba VTD1431 Service Manual page 24

2-10: CUT OFF
1. Set condition is AV MODE without signal.
2. Using the remote control, set the brightness and
contrast to normal position.
3. Place the set with Aging Test for more than 15 minutes.
4. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (00) on the remote control to
select "CUT OFF".
5. Adjust the Screen Volume until a dim raster is obtained.
2-11: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
1. Place the set with Aging Test for more than 15 minutes.
2. Receive the gray scale pattern from the Pattern
Generator.
3. Using the remote control, set the brightness and
contrast to normal position.
4. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "R DRIVE".
5. Press the LEFT/RIGHT button on the remote control to
select the "R DRIVE", "G DRIVE", "M R CUT OFF" or
"M G CUT OFF".
6. Adjust the LEFT/RIGHT button on the remote control to
whiten the R DRIVE, G DRIVE, M R CUT OFF, and M G
CUT OFF at each step tone sections equally.
7. Perform the above adjustments 5 and 6 until the white
color is looked like a white.
2-12: BRIGHT CENT
1. Receive the PAL black pattern*. (RF Input)
2. Using the remote control, set the brightness and
contrast to normal position.
3. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (17) on the remote control to
select "BRIGHT CENT".
4. Press the LEFT/RIGHT button on the remote control
until the screen begin to shine.
5. Receive the PAL black pattern*. (Audio Video Input)
6. Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 2~4.
*The Black Pattern means the whole black raster signal.
Select the "RASTER" of the pattern generator, set to
the OFF position for each R, G and B.
2-13: CONTRAST CENT
1. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (22) on the remote control to
select "CONT CENT".
2. Press the LEFT/RIGHT button on the remote control
until the contrast step No. becomes "30".
3. Receive a broadcast and check if the picture is normal.
4. Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 1~3.
ELECTRICAL ADJUSTMENTS
D-3
2-14: COLOR CENT
1. Receive the PAL color bar pattern. (RF Input)
2. Using the remote control, set the brightness, contrast
and color to normal position.
Connect the oscilloscope to TP803.
3.
Activate the adjustment mode display of Fig. 1-1 and
4.
press the channel button (25) on the remote control to
select "COLOR CENT".
5. Adjust the VOLTS RANGE VARIABLE knob of the
oscilloscope until the range between white 100% and
0% is set to 4 scales on the screen of the oscilloscope.
Press the LEFT/RIGHT button on the remote control
6.
until the red color level is adjusted to 90 ± 10% of the
white level. (Refer to Fig. 2-2)
7. Receive the PAL color bar pattern. (Audio Video Input)
8. Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 2~6.
2-15: Confirmation of Fixed Value (Step No.)
Please check if the fixed values of the each adjustment
items are set correctly referring below.
NO. FUNCTION
02 AGC GAIN
04 R CUTOFF
06 G CUTOFF
07 B DRIVE
09 V POSI 50
10 V POSI 60
18 BRIGHT MAX
19 BRIGHT MIN
20 TINT
21 SHARP
23 CONTRAST MAX
24 CONTRAST MIN
26 COLOR MAX
27 COLOR MIN
30 M B CUT OFF
31 CVBS OUT
32 APR THRESHOLD
33 BELL FILTER
34 BANDPASS
36 V POSI OSD
37 H POSI TXT
38 V POSI TXT
90%
100%
Fig. 2-2
STEP NO.
00
31
31
45
10
05
30
00
31
05
50
10
60
10
100
20
15
22
00
57
135
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