Toshiba 20A22 Service Manual page 13

2-6: VIF VCO
1. Place the set with Aging Test for more than 10 minutes.
2. Receive the monoscope pattern.
3. Connect the digital voltmeter between the pin 5 of
CP601 and the GND.
4. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "V.VCO".
5. Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 2.5V.
2-7: HORIZONTAL PHASE
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 (05) on the remote control to
select "H.PHAS".
4. Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on right and
left becomes minimum.
2-8: VERTICAL SHIFT
1. Receive the monoscope pattern.
2. Using the remote control, set the brightness and contrast
to normal position.
3. Check if the step No. V. SHIFT is "00".
4. Adjust the VR401 until the horizontal line becomes fit to
the notch of the shadow mask.
2-9: VERTICAL SIZE
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 "V.SIZE".
4. Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on upside and
downside becomes 10 ± 2%.
5. Receive a broadcast and check if the picture is normal.
2-10: VERTICAL LINEARITY
NOTE: Adjust after performing adjustments in section 2-9.
After the adjustment of Vertical Linearity, reconfirm
the Vertical Position and Vertical Size adjustments.
1. Receive the monoscope pattern.
2. Using the remote control, set the brightness and contrast
to normal position.
3. Adjust the VR402 until the SHIFT quantity of the OVER
SCAN on upside and downside becomes minimum.
ELECTRICAL ADJUSTMENTS
2-11: 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)
00 OSD
A
2-12: BRIGHT CENT
1. Receive the 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 (13) on the remote control to
select "BRI.CENT".
4. Press the VOL. UP/DOWN button on the remote control
until the screen begin to shine.
5. Receive the black pattern*. (Audio Video Input)
6. Press the TV/VIDEO 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: SUB TINT/SUB COLOR
1. Receive the color bar pattern. (RF Input)
2. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (22) on the remote control to
select "TINT".
3. Connect the oscilloscope to TP024.
4. Press the VOL. UP/DOWN button on the remote control
until the section "A" becomes as straight line.
(Refer to Fig. 2-2)
5. Press the channel button (19) on the remote control to
select "COL. CENT".
6. Connect the oscilloscope to TP022.
7. 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.
8. Press the VOL. UP/DOWN button on the remote control
until the red color level is adjusted to 120 ± 10% of the
white level. (Refer to Fig. 2-3)
9. Receive the color bar pattern. (Audio Video Input)
10. Press the TV/VIDEO button on the remote control to set
to the AV mode. Then perform the above adjustments
2~8.
TV
15
B
Fig. 2-1