Toshiba MW20F52 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 and HS402.
4. Adjust the VR404 until the digital voltmeter is 115
2-3: CUT OFF
1. Adjust the unit to the following settings.
BRI. CENTER=127, CONT MAX=100, R.BIAS=64,
G.BIAS=64, B.BIAS=64, 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.
Place the set in Aging Test for more than 15 minutes.
1.
Receive the gray scale pattern from the Pattern
2.
Generator.
Using the remote control, set the brightness and contrast
3.
to normal position.
Activate the adjustment mode display of Fig. 1-1 and
4.
press the channel button (11) on the remote control to
select "R.BIAS".
Press the CH. UP/DOWN button on the remote control to
5.
select the "R.BIAS", "G.BIAS", "B.BIAS", "R.DRV",
"B.DRV" or "G.DRV".
Adjust the LEFT/RIGHT button on the remote control to
6.
whiten the R.BIAS, G.BIAS, B.BIAS, R.DRV, B.DRV, and
G.DRV at each step tone sections equally.
Perform the above adjustments 5 and 6 until the white
7.
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
0.5V.
D3-2
2-7: 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. Adjust the VR401 until the horizontal line becomes fit to
the notch of the shadow mask. (Refer fo Fig.2-2)
2-8: 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.
2-9: 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