Toshiba VTV1400S, Service Manual

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ELECTRICAL ADJUSTMENTS
D3-2
(TV SECTION)
2-4: CONSTANT VOLTAGE
1.
2.
3.
4.
Connect the digital voltmeter to TP501.
Set condition is AV MODE without signal.
Using the remote control, set the brightness and
contrast to normal position.
Adjust the VR502 until the digital voltmeter is 134
±
1V.
2-5: FOCUS
1.
2.
3. Receive a broadcast.
Turn the Focus Volume fully counterclockwise once.
Adjust the Focus Volume until picture is distinct.
2-6: HORIZONTAL POSITION
1.
2.
3.
4.
5.
6.
Receive the monoscope pattern 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 (08) on the remote control to
select "H POSI (50)".
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on right
and left becomes minimum.
Receive the monoscope pattern of NTSC. (Audio Video
Input)
Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 2~4.
2-9: VERTICAL LINEARITY
Adjust after performing adjustments in section 2-8.
After the adjustment of Vertical Linearity, reconfirm
the Vertical Position and Vertical Size adjustments.
1.
2.
3.
Receive the monoscope pattern from the Pattern
Generator.
Using the remote control, set the brightness and
contrast to normal position.
Adjust the VR401 until the SHIFT quantity of the OVER
SCAN on upside and downside becomes minimum.
NOTE: Adjust after performing adjustments in section 2-7.
2-8: VERTICAL SIZE
Receive the monoscope pattern 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 (11) on the remote control to
select "V SIZE (50)".
Adjust by using the VOL. UP/DOWN button on the
remote control so that the Up/Down OVER SCAN
Quantity becomes equal to the Right/Left OVER SCAN
Quantity.
Receive a broadcast and check if the picture is normal.
Receive the monoscope pattern of NTSC. (Audio Video
Input)
Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 2~4. 1.
2.
3.
4.
5.
6.
7.
2-10: OSD HORIZONTAL
1.
2.
3.
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 (31) on the remote control to
select "H POS OSD".
Press the VOL. UP/DOWN button on the remote control
until the difference of A and B becomes minimum.
(Refer to Fig. 2-2)
31 H POS OSD 35
A B
Fig. 2-2
2-11: CUT OFF
1.
2.
3.
4.
5.
Set condition is AV MODE without signal.
Using the remote control, set the brightness and
contrast to normal position.
Place the set with Aging Test for more than 15 minutes.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (00) on the remote control to
select "CUT OFF".
Adjust the Screen Volume until a dim raster is obtained.
( PAL)
TV
2-3: RF AGC
1.
2.
3.
4.
5.
Place the set with Aging Test for more than 15 minutes.
Receive the UHF (63dB).
Connect the digital voltmeter between the pin 5 of
CP603 and the pin 1 (GND) of CP603.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select "RF AGC".
Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 2.3
±
0.1V.
2-7: VERTICAL POSITION
1.
2.
3.
4.
5.
6.
7.
8.
Receive the monoscope pattern 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 (09) on the remote control to
select "V POSI (50)".
Check if the step No. V. POSI (50) is "05".
Adjust the VR402 until the horizontal line becomes fit to
the notch of the shadow mask.
Receive the monoscope pattern of NTSC. (Audio Video
Input)
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (09) on the remote control to
select "V POSI (50)".
Check if the step No. V. POSI (60) is "15".
NOTE: Adjust after performing adjustments in section 2-6.
NOTE: