Durabrand Color Television Receiver DBTV2500 - Manual (Page 14)

ELECTRICAL ADJUSTMENTS
D1-2
Fig. 2-1
110%
0%
100%
Fig. 2-2
B A
TV
00 OSD 15
Fig. 2-3
2-6: HORIZONTAL PHASE
1.
2.
3.
4.
Receive the center cross signal 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 (05) on the remote control to
select "H.PHASE".
Press the VOL. UP/DOWN button on the remote
control until the SHIFT quantity of the OVER SCAN on
right and left becomes minimum.
2-7: VERTICAL SIZE
1.
2.
3.
4.
5.
Receive the crosshatch signal 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 (06) on the remote control to
select "V.SIZE".
Press the VOL. UP/DOWN button on the remote control
until the rectangle on the center of the screen becomes
square.
Receive a broadcast and check if the picture is normal.
2-8: VERTICAL SHIFT
1.
2.
3.
4.
Receive the crosshatch signal 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 (07) on the remote control to
select "V.SHIFT".
Press the VOL. UP/DOWN button on the remote
control until the horizontal line becomes fit to the notch
of the shadow mask.
NOTE: Adjust after performing adjustments in section 2-7
NOTE: Adjust after performing adjustments in section 2-6
2-9: OSD HORIZONTAL
1.
2. Activate the adjustment mode display of Fig. 1-1.
Press the VOL. UP/DOWN button on the remote
control until the difference of A and B becomes
minimum. (Refer to Fig. 2-3)
2-10: VERTICAL VCO
1.
2.
3.
4.
5.
Place the set with Aging Test for more than 15 minutes.
Receive an 80dB monoscope pattern.
Connect the digital voltmeter between the pin 5 of
CP601.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "VIF VCO".
Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 2.5V.
2-11: SUB BRIGHTNESS
1.
2.
3.
Receive the black pattern*. (RF Input)
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (13) on the remote control to
select "BRIGHTNESS".
Press the VOL. UP/DOWN button on the remote control
unit the screen begin to shine.
2-12: SUB CONTRAST
1.
2.
3.
Receive the color bar pattern.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (14) on the remote control to
select "CONTRAST".
Press the VOL. UP/DOWN button on the remote control
unit the nit for more than 200 nit.