ELECTRICAL ADJUSTMENTS
1. BEFORE MAKING ELECTRICAL
ADJUSTMENTS
1-1:Prepare the following measurement tools for
electrical adjustments.
Fig. 2-2
1. RF AGC DELAY
2. VIDEO LEVEL
3. FM LEVEL
4. OSD H
5. CUT OFF
6. X-RAY
7.
8. 0. RETURN
Fig. 2-3
1. AKB AUTO
2. R. BIAS
3. G. BIAS
4. B. BIAS
5. R. DRIVE
6. G. DRIVE
7. B. DRIVE
8. AGC AUTO 0. RETURN
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
CAUTION
•
•
•
•
Use an isolation transformer when performing any
service on this chassis.
Before removing the anode cap, discharge electricity
because it contains high voltage.
When removing a PCB or related component, after
unfastening or changing a wire, be sure to put the wire
back in its original position.
Inferior silicon grease can damage IC's and transistors.
When replacing IC's and transistors, use only specified
silicon grease (YG6260M).
Remove all old silicon before applying new silicon.
1. Synchro Scope
2. Digital Voltmeter
2. BASIC ADJUSTMENTS
On-Screen Display Adjustment
Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control
simultaneously for more than 1 second to appear the
adjustment mode on the screen as shown in Fig. 2-1.
NOTE
Use the Channel buttons (1-8) on the remote control to
select the options shown in Fig. 2-1.
Press the Channel button (0) on the remote control to
end the adjustments.
1. H/V
2. AKB
3. COLOR TEMP
4. PICTURE
5. OTHERS
6. TEST PATTERN
7. STEREO/SAP
8. (VOL TEST) 0. END
Fig. 2-1
2-1: RF AGC DELAY
1.
2.
3.
4.
5.
Receive an 63dB monoscope pattern.
Connect the digital voltmeter between the pin 2 of
CP101 and the pin 6 (GND) of CP101.
Activate the adjustment mode display of Fig. 2-1 and
press the channel button (5) on the remote control to
select "OTHER". The Fig. 2-2 appears on the display.
Press the channel button (1) on the remote control to
select "RF AGC DELAY".
Press the VOL. UP/DOWN button on the remote
control until the digital voltmeter is 2.80 ± 0.05V.
2-2: CUT OFF
1.
2.
3.
4.
Using the remote control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 2-1 and
press the channel button (5) on the remote control to
select "OTHERS". The Fig. 2-2 appears on the display.
Press the channel button (5) on the remote control to
select "CUT OFF".
Adjust the Screen Volume until a dim raster is obtained.
2-3: WHITE BALANCE
NOTE:
Adjust after performing adjustments in section 2-2.
1.
2.
3.
Receive the color bar pattern.
Activate the adjustment mode display of Fig. 2-1 and
press the channel button (2) on the remote control to
select "AKB". The Fig. 2-3 appears on the display.
Adjust the adjustment mode display of Fig. 2-3 until the
white color is looked like a white.
2-4: SUB BRIGHTNESS
Receive the monoscope pattern. (RF Input)
Using the remote control, set the brightness and contrast
to normal position.
Activate the adjustment mode display of Fig. 2-1 and press
the channel button (4) on the remote control to select
"PICTURE". The Fig. 2-4 appears on the display.
Press the channel button (1) on the remote control to
select "BRIGHT".
Press the VOL. UP/DOWN button on the remote control
until the white 10% is starting to be visible.
Receive the monoscope pattern. (Audio Video Input)
Press the AV button on the remote control to set the AV
mode. Then perform the above adjustments 2~4.
1.
2.
3.
4.
5.
6.
7.
D1-1