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Toshiba 15V31B サービスマニュアル
2-6: FOCUS
1.
Receive a 70dB monoscope pattern.
2.
Turn the Focus Volume fully counterclockwise once.
3.
Adjust the Focus Volume until picture is distinct.
2-7: HORIZONTAL POSITION
1.
Receive the monoscope pattern from the Pattern
Generator.
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 (08) on the remote control to
select "H POSI (50)".
4.
Press the VOL. +/- button on the remote control until
the SHIFT quantity of the OVER SCAN on right and left
becomes minimum.
5.
Receive the monoscope pattern of NTSC. (Audio Video
Input)
6.
Using the remote control, set the brightness and
contrast to normal position.
7.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (39) on the remote control to
select "H POSI (60)".
8.
Press the VOL. +/- button on the remote control until
the SHIFT quantity of the OVER SCAN on right and left
becomes minimum.
2-8: VERTICAL SIZE
1.
Receive the monoscope pattern from the Pattern
Generator.
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 (11) on the remote control to
select "V SIZE (50)".
4.
Adjust by using the VOL. +/- button on the remote
control so that the Up/Down OVER SCAN Quantity
becomes equal to the Right/Left OVER SCAN Quantity.
5.
Receive a broadcast and check if the picture is normal.
6.
Receive the monoscope pattern of NTSC. (Audio Video
Input)
7.
Using the remote control, set the brightness and
contrast to normal position.
8.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (12) on the remote control to
select "V SIZE (60)".
9.
Adjust by using the VOL. +/- button on the remote
control so that the Up/Down OVER SCAN Quantity
becomes equal to the Right/Left OVER SCAN Quantity.
2-9: VERTICAL POSITION/VERTICAL LINEARITY
1.
Receive the monoscope pattern from the Pattern
Generator.
2.
Using the remote control, set the brightness and
contrast to normal position.
3.
Adjust the VR401 until the horizontal line becomes fit to
the notch of the shadow mask.
4.
Adjust the VR420 until the SHIFT quantity of the OVER
SCAN on upside and downside becomes minimum.
ELECTRICAL ADJUSTMENTS
D-2
2-10: BRIGHT CENT
1.
Receive the PAL black pattern*. (RF Input)
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 (17) on the remote control to
select "BRIGHT CENT".
5.
Press the VOL. +/- button on the remote control until
the screen begin to shine.
6
Receive the PAL black pattern*. (Audio Video Input)
7.
Set to the AV mode. Then perform the above
adjustments 2~5.
*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.
2-11: CONTRAST CENT
1.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (22) on the remote control to
select "CONTRAST CENT".
2.
Press the VOL. +/- button on the remote control until
the contrast step No. becomes "31".
3.
Receive a broadcast and check if the picture is normal.
4.
Set to the AV mode.
5.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (22) on the remote control to
select "CONTRAST CENT".
6.
Press the VOL. +/- button on the remote control until
the contrast step No. becomes "34".
7.
Receive a broadcast and check if the picture is normal.
2-12: 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.
3.
Connect the oscilloscope to TP022.
4.
Activate the adjustment mode display of Fig. 1-1 and
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 5 scales on the screen of the oscilloscope.
6.
Press the VOL. +/- button on the remote control until
the red color level is adjusted to 85 ± 10% of the white
level. (Refer to Fig. 2-1)
7.
Receive the PAL color bar pattern. (Audio Video Input)
8.
Set to the AV mode. Then perform the above
adjustments 2~6.
100%
85%
Fig. 2-1