Toshiba MW27H62 Service Manual page 46

(TV SECTION)
2-2: CONSTANT VOLTAGE
1. Place the set in AV MODE without signal.
2. Using the remote control, set the brightness and contrast to
normal position.
3. Connect the digital voltmeter to TP401.
Adjust the VR1701 until the digital voltmeter is 135.5 ± 0.5V.
4.
2-3: CUT OFF
1. Adjust the unit to the following settings.
R.BIAS=127, G.BIAS=127, B.BIAS=127, R.DRV=63,
G.DRV=07, B.DRV=63,
2. Place the set in Aging Test for more than 15 minutes.
3. Place the set in AV MODE without signal.
4. Using the remote control, set the brightness and contrast
to normal position.
5. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (02) on the remote control to
select "CUT OFF".
6. Adjust the Screen Volume until a dim raster is obtained.
2-4: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
1. Place the set in 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 (11) on the remote control to
select "R.BIAS".
5. Press the CH. UP/DOWN button on the remote control to
select the "R.BIAS", "G.BIAS", "B.BIAS", "R.DRV",
"B.DRV" or "G.DRV".
6. Adjust the VOL. UP/DOWN button on the remote control
to whiten the R.BIAS, G.BIAS, B.BIAS, R.DRV, B.DRV,
and G.DRV at each step tone sections equally.
7. Perform the above adjustments 5 and 6 until the white
color is achieved.
2-5: FOCUS
1. Receive the monoscope pattern.
2. Turn the Focus Volume fully counterclockwise once.
3. Adjust the Focus Volume until picture is distinct.
2-6: HORIZONTAL POSITION
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 (03) on the remote control to
select "H.POSI".
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.
ELECTRICAL ADJUSTMENTS
D3-2
2-7: HORIZONTAL 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 (43) 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
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 (07) on the remote control to
select "V.POSI".
4. Check if the step No. V.POSI is "01".
5. Adjust the VR404 until the horizontal line becomes fit to
the notch of the shadow mask. (Refer to Fig. 2-2)
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 Up/Down OVER SCAN Quantity becomes equal
to the Right/Left OVER SCAN Quantity.
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. Activate the adjustment mode display of Fig. 1-1 and
press the channel button (08) on the remote control to
select "V.LIN".
4. Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on upside
and downside becomes minimum.
horizontal line
Notch
Shadow mask
Fig. 2-2