Aiwa VX-G143 Service Manual page 27

(TV SECTION)
2-4: CONSTANT VOLTAGE
1. Connect the digital voltmeter to TP401.
2. Set condition is AV MODE without signal.
Adjust the VR502 until the DC voltage is 135 ± 0.5V.
3.
2-5: CUT OFF
1. Place the set with Aging Test for more than 15 minutes.
2. Set condition is AV MODE without signal.
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 (5) on the remote control to
select "OTHERS". The Fig. 2-2 appears on the display.
5. Press the channel button (5) on the remote control to
select "CUT OFF".
6. Adjust the Screen Volume until a dim raster is obtained.
2-6: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
1. Place the set with Aging Test for more than 15 minutes.
2. Receive the white 100% signal 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 (2) on the remote control to
select "AKB". The Fig. 2-3 appears on the display.
5. Press the channel button (2) on the remote control to
select the "R.BIAS".
6. Using the PLAY or STOP button on the remote control,
adjust the R.BIAS.
7. Press the CH. UP/DOWN button on the remote control
to select the "G.BIAS", "B.BIAS", "R.DRIVE",
"G.DRIVE" or "B.DRIVE".
8. Using the PLAY or STOP button on the remote control,
adjust the G.BIAS, B.BIAS, R.DRIVE, G.DRIVE or
B.DRIVE.
9. Perform the above adjustments 7 and 8 until the white
color is looked like a white.
1.
2. R.BIAS
3. G.BIAS
4. B.BIAS
5. R.DRIVE
6. G.DRIVE
7. B.DRIVE
8.
2-7: FOCUS
1. Receive a broadcast.
2. Turn the Focus Volume fully counterclockwise once.
3. Adjust the Focus Volume until picture is distinct.
ELECTRICAL ADJUSTMENTS
0. RETURN
Fig. 2-3
2-8: HORIZONTAL PHASE
1. Receive the center cross 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 (1) on the remote control to
select "H/V". The Fig. 2-4 appears on the display.
4. Press the channel button (1) on the remote control to
select "H. PHASE".
5. Press the PLAY or STOP button on the remote control
until the right and left screen size of the vertical line
becomes the same.
1. H. PHASE
2. H. BLK
3. V. SIZE 50/60
4. V. POSI 50/60
5. V. LIN 50/60
6. V. SC 50/60
7. V. COMP
8. (H FREQ)
"The adjustment item 8 is not used for this model."
2-9: VERTICAL LINEARITY
NOTE: Adjust after performing adjustments in section 2-8.
1. Receive the cross hatch 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 (1) on the remote control to
select "H/V". The Fig. 2-4 appears on the display.
4. Press the channel button (5) on the remote control to
select "V. LIN 50/60".
5. Press the PLAY or STOP button on the remote control
until the SHIFT quantity of the OVER SCAN on upside
and downside becomes minimum.
6. Receive the cross hatch signal of NTSC. (Audio Video
Input)
7. Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 2~5.
2-10: VERTICAL POSITION
NOTE: Adjust after performing adjustments in section 2-9.
1. Receive the center cross 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 (1) on the remote control to
select "H/V". The Fig. 2-4 appears on the display.
4. Press the channel button (4) on the remote control to
select "V. POSI 50/60".
5. Press the PLAY or STOP button on the remote control
until the horizontal line becomes fit to the notch of the
shadow mask.
6. Receive the center cross signal of NTSC. (Audio Video
Input)
7. Press the AV button on the remote control to set to the
AV mode. Then perform the above adjustments 2~5.
D2-2
0. RETURN
Fig. 2-4