ELECTRICAL ADJUSTMENTS
D-1
1.
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.
When you exchange IC and Transistor with a heat sink,
apply silicon grease on the contractsection 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.)
BEFORE MAKING ELECTRICAL
ADJUSTMENTS
1. Oscilloscope
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 28
2. BASIC ADJUSTMENTS
2-1: CUT OFF
1.
2.
3.
4.
5.
Place the set in AV MODE without signal.
Using the remote control, set the brightness and contrast
to normal position.
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.
FUNCTION
OSD H
CUT OFF
H.VCO
H.PHASE
V.SIZE
V.SHIFT
R.DRIVE
B.DRIVE
R.BIAS
G.BIAS
B.BIAS
BRIGHT CENT
BRIGHT MAX
BRIGHT MIN
CONTRAST CENT
NO.
00
01
04
05
06
07
08
09
10
11
12
13
14
15
16
Fig. 1-2
FUNCTION
CONTRAST MAX
CONTRAST MIN
COLOR CENT
COLOR MAX
COLOR MIN
TINT
SHARPNESS
FM LEVEL
LEVEL
SEPARATION 1
SEPARATION 2
TEST MONO
TEST STEREO
NO.
17
18
19
20
21
22
23
24
25
26
27
28
29
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 remote 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.DRIVE", "B.DRIVE", "G.BIAS" or "B.BIAS".
Using the VOL. UP/DOWN button on the remote control,
adjust the R.DRIVE, B.DRIVE, 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: VERTICAL SIZE
1.
2.
3.
4.
Receive the monoscope pattern from the Pattern
Generator.
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 SHIFT quantity of the OVER SCAN on upside
and downside becomes 10
±
1%.
Receive a broadcast and check if the picture is normal.
