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1. ADJUSTMENT PROCEDURE
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.)
Prepare the following measurement tools for electrical
adjustments.
1. Oscilloscope
2. Digital Voltmeter
3. Multi-sound Generator
4. Pattern Generator
On-Screen Display Adjustment
1. 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 1 second to
appear the adjustment mode on the screen as shown in
Fig. 1-1.
00 OSD
3.
Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
4.
Press the MENU button on the remote control to end the
adjustments.
NO.
FUNCTION
NO.
00
OSD H
16
01
CUT OFF
17
02
H. VCO
18
03
H. PHASE
19
05
V. SHIFT
20
06
H. SIZE
21
07
V. SIZE
22
08
V. LINEARITY
23
09
VS CORRECTION
24
10
DRIVE R MEDIUM
25
11
DRIVE B MEDIUM
26
12
R BIAS MEDIUM
27
13
G BIAS MEDIUM
28
14
B BIAS MEDIUM
29
15
BRIGHT MAX
30
ELECTRICAL ADJUSTMENTS
TV
27
FUNCTION
NO.
FUNCTION
BRIGHT CENT
31
E/W CORNER
BRIGHT MIN
32
E/W TRAPEZIUM
CONTRAST MAX
33
LEVEL
CONTRAST CENT
34
SEPARATION1
CONTRAST MIN
35
SEPARATION2
COLOR MAX
51
DRIVE R COOL
COLOR CENTER
52
DRIVE B COOL
COLOR MIN
53
R BIAS COOL
TINT
54
G BIAS COOL
SHARPNESS
55
B BIAS COOL
Cb DELAY FINE
56
DRIVE R WARM
Cr DELAY FINE
57
DRIVE B WARM
Cb PEDESTAL ADJ
58
R BIAS WARM
Cr PEDESTAL ADJ
59
G BIAS WARM
E/W PARABOLA
60
B BIAS WARM
2. BASIC ADJUSTMENTS
2-1: CONSTANT VOLTAGE
1.
Place the set with Aging Test for more than 5 minutes.
2.
Set condition is AV MODE without signal.
3.
Connect the digital voltmeter to the TP003.
Adjust the VR502 until the digital voltmeter is 135 ± 1V.
4.
2-2: CUT OFF
1.
Place the set with Aging Test for more than 15 minutes.
2.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select "CUT OFF".
3.
Adjust the Screen Volume until a dim raster is obtained.
2-3: WHITE BALANCE
Adjust after performing CUT OFF adjustment.
NOTE:
The adjustments of MEDIUM mode, COOL mode,
WARM mode are needed.
1.
Place the set with Aging Test for more than 10 minutes.
2.
Receive the gray scale pattern from the Pattern Generator.
3.
Using the remote control, set the brightness and contrast
to normal position.
4.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (12) on the remote control to
select "R. BIAS".
5.
Press the CH. UP/DOWN button on the remote control to
select the "R. BIAS", "G. BIAS", "B. BIAS", "B. DRIVE" or
"G. DRIVE".
6.
Adjust the VOL. UP/DOWN button on the remote control
to whiten the R. BIAS, G. BIAS, B. BIAS, B. DRIVE, and
G. DRIVE at each step tone sections equally.
7.
Perform the above adjustments 5 and 6 until the white
color is looked like a white.
2-4: HORIZONTAL PHASE
1.
Receive the monoscope pattern.
Fig. 1-1
2.
Using the remote control, set the brightness and contrast
to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (03) on the remote control to
select "H. PHAS".
4.
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on right and
left becomes minimum.
2-5: HORIZONTAL SIZE
1.
Receive the monoscope pattern.
2.
Using the remote control, set the brightness and contrast
to normal position.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (06) on the remote control to
select "H. SIZE".
4.
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on right and
left becomes 11 ± 1%.
Fig. 1-2
D-1
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