D-1
ELECTRICAL ADJUSTMENTS
1.
Read and perform these adjustments when repairing the
circuits or replacing electrical parts or PCB assemblies.
2. BASIC ADJUSTMENTSBEFORE MAKING ELECTRICAL
ADJUSTMENTS
2-1: CUT OFF
1.
2.
3.
4.
Adjust the unit to the following settings.
R.DRIVE=64, B.DRIVE=64, R.BIAS=128, G.BIAS=128,
B.BIAS=128, BRI.CENT=122, CONT.MAX=100.
Place the set in Aging Test for more than 15 minutes.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select "CUT OFF".
Adjust the Screen Volume until a dim raster is obtained.
2-2: FOCUS
1.
2.
3.
Receive the monoscope pattern.
Turn the Focus Volume fully counterclockwise once.
Adjust the Focus Volume until picture is distinct.
2-3: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
Place the set in Aging Test for more than 15 minutes.
Receive the white 100% signal from the Pattern
Generator.
Using the adjustment control, set the brightness and
contrast to normal position.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (10) on the remote control to
select "R.BIAS".
Using the VOL.UP/DOWN button on the remote
control, adjust the R.BIAS.
Press the CH.UP/DOWN button on the remote control to
select the "R.DRV", "B.DRV", "G.BIAS" or "B.BIAS".
Using the VOL.UP/DOWN button on the remote control,
adjust the R.DRV, B.DRV, G.BIAS or B.BIAS.
Perform the above adjustments 6 and 7 until the white
color is achieved.
1.
2.
3.
4.
5.
6.
7.
8.
2-4: SUB TINT/SUB COLOR
1.
2.
3.
4.
5.
6.
7.
8.
9.
10.
11.
Receive the color bar pattern.
Connect the oscilloscope to TP023.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (22) on the remote control to
select "TINT".
Press the VOL.UP/DOWN button on the remote control
until the section "A" becomes as straight line
(Refer to Fig. 2-1)
Connect the oscilloscope to TP022.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (19) on the remote control to
select "COL.CENT".
Press the VOL.UP/DOWN button on the remote control
until the red color level is adjusted to 120 ±10% of the
white level. (Refer to Fig. 2-2)
Receive the color bar pattern. (Audio Video Input)
Press the TV/AV button on the remote control to set to
the AV mode. Then perform the above adjustments 2~7.
Receive the color bar pattern.
Press the TV/AV button on the remote control to set to
the DIGITAL mode. Then perform the above adjustments
2~4.
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.
When you exchange IC and Transistor with a heat sink,
apply silicon grease (YG6260M) on the contract
section of the heat sink, Before applying new silicon
grease, remove all the old silicon grease. (Old grease
may cause damages to the IC and Transistor.)
•
•
•
•
1. Synchro Scope
2. Digital Voltmeter
3. Pattern Generator
Prepare the following measurement tools for electrical
adjustments.
On-Screen Display Adjustment
In the condition of NO indication on the screen.
Press the VOL. DOWN button on the set and the
Channel button (9) on the remote control for more than
2 seconds to appear the adjustment mode on the
screen as shown in Fig. 1-1.
1.
Fig. 1-1
Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
Press the MENU button on the remote control to end
the adjustments.
2.
3.
TV
00 OSD H 12
FUNCTION
OSD H
CUT OFF
H.VCO
H.PHAS
V.SIZE
V.SFT
R.DRV
B.DRV
R.BIAS
G.BIAS
B.BIAS
BRI.CENT
BRI.MAX
BRI.MIN
NO.
00
01
04
05
06
07
08
09
10
11
12
13
14
15
Fig. 1-2
FUNCTION
CONT.CENT
CONT.MAX
CONT.MIN
COL.CENT
COL.MAX
COL.MIN
TINT
SHAR.CENT
SHAR.MAX
SHAR.MIN
CB DL
CR DL
CB PED
CR PED
NO.
16
17
18
19
20
21
22
23
24
25
26
27
28
29
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