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 for a heat sink,
apply the silicon grease on the contact 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).
BEFORE MAKING ELECTRICAL
ADJUSTMENTS
Prepare the following measurement tools for electrical
adjustments.
1. Oscilloscope
2. Digital Voltmeter
3. AC Voltmeter
4. Pattern Generator
5. Multi-Sound Signal Generator
On-Screen Display Adjustment
Set the VOLUME to minimum.
Press the VOL. DOWN button on the set and the Channel
button (9) on the remote control for more than 1 second
to appear the adjustment mode on the screen as shown
in Fig. 1-1.
1.
2.
Fig. 1-1
Use the Channel UP/DOWN button or Channel button (1-
0) 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.
3.
4.
01 OSD
15
Function
Step No.
Fig. 1-2
NO.
01
02
03
04
05
06
07
08
09
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
FUNCTION
CONT. AV(MIN)
COL. AV(CENT.)
COL. AV(MAX)
COL. AV(MIN)
TINT AV
SHARPNESS AV
SUB BIAS
BRI. DVD(CENT.)
BRI. DVD(MAX)
BRI. DVD(MIN)
CONT. DVD(CENT.)
CONT. DVD(MAX)
CONT. DVD(MIN)
COL. DVD(CENT.)
COL. DVD(MAX)
COL. DVD(MIN)
TINT DVD
SHARPNESS DVD
SUB BIAS
BRI. GAME(CENT.)
BRI. GAME(MAX)
BRI. GAME(MIN)
CONT. GAME(CENT.)
CONT. GAME(MAX)
CONT. GAME(MIN)
SUB BIAS
TUNING V MUTE
POWER ON V MUTE
INPUT LEVEL
SEPARATION L
SEPARATION H
X-RAY TEST
H STOP
H FREQ
NO
.
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
FUNCTION
OSD H
OSD CONTRAST
CUT OFF
H POSITION
H BLK L
H BLK R
V SIZE
V POSITION
V LINEARITY
V S CORRECTION
V COMP
R CUT OFF
G CUT OFF
B CUT OFF
R DRIVE
G DRIVE
B DRIVE
BRIGHTNESS(CENT.)
BRIGHTNESS(MAX)
BRIGHTNESS(MIN)
CONTRAST(CENT.)
CONTRAST(MAX)
CONTRAST(MIN)
COLOR(CENT.)
COLOR(MAX)
COLOR(MIN)
TINT
SHARPNESS
SUB BIAS
BRI. AV(CENT.)
BRI. AV(MAX)
BRI. AV(MIN)
CONT. AV(CENT.)
CONT. AV(MAX)
2. BASIC ADJUSTMENTS
2-1: CONSTANT VOLTAGE
1.
2.
3.
4.
Set condition is AV MODE without signal.
Using the remote control, set the brightness and contrast
to normal position.
Connect the digital voltmeter to TP401.
Adjust the VR3800 until the digital voltmeter is 115
±
0.5V.
2-3: CUT OFF
1.
2.
3.
4.
5.
6.
Adjust the unit to the following settings.
R CUT OFF=7F, G CUT OFF=7F, B CUT OFF=7F,
R DRIVE=3F, G DRIVE=07, B DRIVE=3F
Place the set with Aging Test for more than 15 minutes.
Set condition is AV MODE without signal.
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 (03) 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.
