ELECTRICAL ADJUSTMENTS
1. BEFORE MAKING ELECTRICAL
1. AGC AUTOADJUSTMENTS
2. RF AGC DELAY
Read and perform these adjustments when repairing the3. VIDEO LEVEL
circuits or replacing electrical parts or PCB assemblies.4. FM LEVEL
5. OSD H
CAUTION
6. CUT OFF
YUse an isolation transformer when performing any7.
service on this chassis.8. 0. RETURN
YBefore removing the anode cap, discharge electricityFig. 2-2
because it contains high voltage.
YWhen removing a PCB or related component, after 2-2: VCO
unfastening or changing a wire, be sure to put the wire
1.Receive the color bar pattern.
back in its original position.
2.Connect the digital voltmeter to TP202.
Inferior silicon grease can damage IC's and transistors.
3.Adjust the L204 until the digital voltmeter is 3.5 ? 0.05V.YWhen replacing IC's and transistors, use only specified
silicon grease (YG6260M).
2-3: CUT OFF
Remove all old silicon before applying new silicon.
1.Place the set with Aging Test for more than 15 minutes.
Prepare the following measurement tools for electrical
2.Set condition is AV MODE without signal.
adjustments.
3.Using the remote control, set the brightness and
1. Synchro Scopecontrast to normal position.
2. Digital Voltmeter4.Activate the adjustment mode display of Fig. 2-1 and
3. Color Bar Generatorpress the channel button (5) on the remote control to
select "OTHERS". The Fig. 2-2 appears on the display.
2. BASIC ADJUSTMENTS5.Press the channel button (6) on the remote control to
select "CUT OFF".
On-Screen Display Adjustment
6.Adjust the Screen Volume until a dim raster is obtained.
1. Unplug AC cord to set the clock to the nonclock setting
mode. And then set the volume to minimum.2-4: FOCUS
2. Press both VOL. DOWN button on the set and the
1.Using the remote control, set the brightness and
Channel button (9) on the remote control for more than
contrast to normal position.
1 second to appear the adjustment mode on the screen
2.Receive the monoscope pattern.
as shown in Fig. 2-1.
3.Turn the Focus Volume fully counterclockwise once.
NOTE4.Adjust the Focus Volume until picture is distinct.
Use the Channel buttons (1-8) on the remote control to2-5: WHITE BALANCE
select the options shown in Fig. 2-1.
Press the Channel button (0) on the remote control toNOTE: Adjust after performing CUT OFF adjustments.
end the adjustments.
Place the set wiht Aging Test for more than 10 minutes.
1.Receive the white 100% signal from the Pattern
1. H/VGenerator.
2.
2. AKBUsing the remote control, set the brightness and contrast
3. COLOR TEMP3.to normal position.
4. PICTUREActivate the adjustment mode display of Fig. 2-1 and
5. OTHERS4.press the channel button (2) on the remote control to
6. TEST PATTERNselect "AKB". The Fig. 2-3 appears on the display.
7.Press the channel button (2) on the remote control to
8. (VOL TEST) 0. ENDselect the "R.BIAS".
Fig. 2-15.
Using the VOL. UP/DOWN on the remote control, adjust
6the R.BIAS.
2-1: RF AGC DELAYPress the CH. UP/DOWN button on the remote control to
select the "G.BIAS", "B.BIAS", "R.DRIVE", or "B.DRIVE".
1.Receive monoscope pattern.7.
2.Connect the digital voltmeter to pin 5 of CP101.Using the VOL. UP/DOWN button on the remote control,
3.Activate the adjustment mode display of Fig. 2-1 and8.adjust the G.BIAS, B.BIAS, R.DRIVE or B.DRIVE.
press the channel button (5) on the remote control toPerform the above adjustments 7 and 8 until the white
select "OTHERS". The Fig. 2-2 appears on the display.9.color is looked like a white.
4.Press the channel button (2) on the remote control to
select "RF AGC RELAY".
5.Press the VOL. UP/DOWN button on the remote control
until the digital voltmeter is 1.4 ? 0.05V.
D1-1 |
ACEC
