Panasonic CT-20SL15 - 20" CRT TV Manual de serviço - Página 14

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Panasonic CT-20SL15 - 20
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 with a heat sink,
•
apply silicon grease on the contact section of the heat
sink. Before applying new silicon grease (YG6260M) ,
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 2
seconds to appear the adjustment mode on the screen
as shown in Fig. 1-1.
00 OSD
2.
Use the Channel UP/DOWN button or Channel button
(0-9) on the remote control to select the options shown
in Fig. 1-2.
3.
Press the MENU button on the remote control to end the
adjustments.
NO.
FUNCTION
00
OSD H
01
CUT OFF
02
H. VCO
03
H. PHASE
04
AFC GAIN
05
V. SHIFT
06
H. SIZE
07
V. SIZE
08
V. LINERITY
09
VS CORRECTION
10
R DRIVE
11
B DRIVE
12
R. BIAS
13
G. BIAS
14
B. BIAS
15
BRIGHT MAX
16
BRIGHT CENT
17
BRIGHT MIN
18
CONTRAST MAX

ELECTRICAL ADJUSTMENTS

TV
38
Fig. 1-1
NO.
FUNCTION
19
CONTRAST CENT
20
CONTRAST MIN
21
COLOR MAX
22
COLOR CENTER
23
COLOR MIN
24
TINT
25
SHARP. MAX
26
SHARP. CENT
27
SHARP. MIN
28
CB DL
29
CR DL
30
CB PED
31
CR PED
32
PARABOLA
33
CORNER
34
TRAPWZIUM
35
LEVEL
36
SEPARATION1
37
SEPARATION2
Fig. 1-2
2. BASIC ADJUSTMENTS
2-1: CONSTANT VOLTAGE
1.
Place the set in AV MODE without signal.
2.
Connect the digital voltmeter to the TP001.
Adjust the VR502 until the digital voltmeter is 115 ± 0.5V.
3.
2-2: CUT OFF
1.
Place the set in Aging Test for more than 15 minutes.
2.
Place the set in AV MODE without signal.
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 (01) on the remote control to
select "CUT OFF".
5.
Adjust the Screen Volume until a dim raster is obtained.
2-3: WHITE BALANCE, WHITE BALANCE CS
NOTE: Adjust after performing CUT OFF adjustment.
1.
Place the set in Aging Test for more than 15 minutes.
2.
Receive the gray scale pattern from the Pattern Generator
with Burst On.
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
"R. DRIVE".
6.
Adjust the VOL. UP/DOWN button on the remote control
to whiten the R. BIAS, G. BIAS, B. BIAS, B. DRIVE and
R. DRIVE at each step tone sections equally.
7.
Perform the above adjustments 5 and 6 until the white
color is achieved.
8.
Press the TV/VIDEO button on the remote control to set
to the CS mode.
9.
Receive the gray scale pattern from the Pattern Generat
or with Brust On.
10.
If the picture is too much green.Activate the adjustment
mode display of Fig. 1-1 and press the channel button
(30) on the remote control to select "CB PED".
11.
Adjust the VOL. UP/DOWN button on the remote control
to select the step up.
12.
If the picture is too much red. Activate the adjustment
mode display of Fig. 1-1 and press the channel button
(31) on the remote control to select "CR PED".
13.
Adjust the VOL. UP/DOWN button on the remote control
to select the step down.
2-4: FOCUS
1.
Receive a broadcast.
2.
Turn the Focus Volume fully counterclockwise once.
3.
Adjust the Focus Volume until picture is distinct.
2-5: HORIZONTAL PHASE
1.
Receive the center cross signal from the Pattern Generator.
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.PHASE".
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.
D-1