Toshiba 20AF41 Service Manual - Page 10

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ELECTRICAL ADJUSTMENTS 2-7: HORIZONTAL SIZE NOTE: Adjust after performing adjustments in section 2-6. 1. Receive the monoscope pattern. 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 (06) on the remote control to select "H. SIZE". 4. Press the VOL. UP/DOWN button on the remote control until the SHIFT quantity of the OVER SCAN on right and left becomes 10 ± 2%. 2-8: VERTICAL POSITION NOTE: Adjust after performing adjustments in section 2-7. 1. Receive the center cross signal from the Pattern Generator. 2. Activate the adjustment mode display of Fig. 1-1 and press the channel button (05) on the remote control to select "V. POSI". 3. Press the VOL. UP/DOWN button on the remote control until the horizontal line becomes fit to the notch of the shadow mask. 2-9: VERTICAL SIZE NOTE: Adjust after performing adjustments in section 2-8. 1. Receive the crosshatch signal from the Pattern Generator. 2. Activate the adjustment mode display of Fig. 1-1 and press the channel button (07) on the remote control to select "V. SIZE". 3. Press the VOL. UP/DOWN button on the remote control until the rectangle on the center of the screen becomes square. 4. Receive a broadcast and check if the picture is normal. 2-12: CORNER CORR TOP 1. Receive the crosshatch signal 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 (25) on the remote control to select "COR TOP". 4. Press the VOL. UP/DOWN button on the remote control until the upper section of the both ends vertical lines are straight. 2-13: CORNER CORR BOTTOM 1. Receive the crosshatch signal 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 (26) on the remote control to select "COR BTM". 4. Press the VOL. UP/DOWN button on the remote control until the bottom section of the both ends vertical lines are straight. 2-14: OSD HORIZONTAL 1. Activate the adjustment mode display of Fig. 1-1. 2. Press the VOL. UP/DOWN button on the remote control until the difference of A and B becomes minimum. (Refer to Fig. 2-1) TV 2-10: PARABOLA 1. Receive the crosshatch signal 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 (23) on the remote control to select "PARABOLA". 4. Press the VOL. UP/DOWN button on the remote control until the right and left vertical lines are straight. 2-11: TRAPEZIUM 1. Receive the crosshatch signal 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 (24) on the remote control to select "TRAPEZIU". 4. Press the VOL. UP/DOWN button on the remote control until the both vertical lines of the screen become parallel. 00 OSD 15 A B Fig. 2-1 2-15: LEVEL 1. Receive a 70dB monoscope pattern. 2. Connect the AC voltmeter to TP901. 3. Activate the adjustment mode display of Fig. 1-1 and press the channel button (30) on the remote control to select "LEVEL". 4. Press the VOL. UP/DOWN button on the remote control until the AC voltmeter is 75 ± 2mV.

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ELECTRICAL ADJUSTMENTS
2-7: HORIZONTAL SIZE
NOTE:
Adjust after performing adjustments in section 2-6.
1.
2.
3.
4.
Receive the monoscope pattern.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of
Fig. 1-1
and
press the channel button
(06)
on the remote control to
select "H. SIZE".
Press the VOL. UP/DOWN button on the remote
control until the SHIFT quantity of the OVER SCAN on
right and left becomes 10
±
2%.
2-8: VERTICAL POSITION
NOTE:
Adjust after performing adjustments in section 2-7.
1.
2.
3.
Receive the center cross signal from the Pattern
Generator.
Activate the adjustment mode display of
Fig. 1-1
and
press the channel button
(05)
on the remote control to
select "V. POSI".
Press the VOL. UP/DOWN button on the remote
control until the horizontal line becomes fit to the notch
of the shadow mask.
2-9: VERTICAL SIZE
NOTE:
Adjust after performing adjustments in section 2-8.
1.
2.
3.
4.
Receive the crosshatch signal from the Pattern
Generator.
Activate the adjustment mode display of
Fig. 1-1
and
press the channel button
(07)
on the remote control to
select "V. SIZE".
Press the VOL. UP/DOWN button on the remote
control until the rectangle on the center of the screen
becomes square.
Receive a broadcast and check if the picture is normal.
2-10: PARABOLA
1.
2.
3.
4.
Receive the crosshatch signal from the Pattern
Generator.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of
Fig. 1-1
and
press the channel button
(23)
on the remote control to
select "PARABOLA".
Press the VOL. UP/DOWN button on the remote control
until the right and left vertical lines are straight.
2-11: TRAPEZIUM
1.
2.
3.
4.
Receive the crosshatch signal from the Pattern
Generator.
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of
Fig. 1-1
and
press the channel button
(24)
on the remote control to
select "TRAPEZIU".
Press the VOL. UP/DOWN button on the remote control
until the both vertical lines of the screen become parallel.
2-12: CORNER CORR TOP
1.
2.
3.
4.
Receive the crosshatch signal from the Pattern
Generator.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of
Fig. 1-1
and
press the channel button
(25)
on the remote control to
select "COR TOP".
Press the VOL. UP/DOWN button on the remote control
until the upper section of the both ends vertical lines are
straight.
2-13: CORNER CORR BOTTOM
1.
2.
3.
4.
Receive the crosshatch signal from the Pattern
Generator.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of
Fig. 1-1
and
press the channel button
(26)
on the remote control to
select "COR BTM".
Press the VOL. UP/DOWN button on the remote control
until the bottom section of the both ends vertical lines
are straight.
B
A
TV
00
OSD
15
Fig. 2-1
2-14: OSD HORIZONTAL
1.
2.
Activate the adjustment mode display of
Fig. 1-1
.
Press the VOL. UP/DOWN button on the remote control
until the difference of A and B becomes minimum.
(Refer to Fig. 2-1)
2-15: LEVEL
1.
2.
3.
4.
Receive a 70dB monoscope pattern.
Connect the AC voltmeter to
TP901
.
Activate the adjustment mode display of
Fig. 1-1
and
press the channel button
(30)
on the remote control to
select "LEVEL".
Press the VOL. UP/DOWN button on the remote
control until the AC voltmeter is 75
±
2mV.