Toshiba 20AS23 Instrukcja serwisowa - Strona 13

Przeglądaj online lub pobierz pdf Instrukcja serwisowa dla TV Toshiba 20AS23. Toshiba 20AS23 35 stron. Color television
Również dla Toshiba 20AS23: Instrukcja obsługi (14 strony), Instrukcja serwisowa (5 strony)

Drukuj stronę
Toshiba 20AS23 Instrukcja serwisowa
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. 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
00
OSD H
01
CUT OFF
04
H. VCO
05
H. PHASE
06
V. SIZE
07
V. SHIFT
08
R DRIVE
09
B DRIVE
10
R BIAS
11
G BIAS
12
B BIAS
13
BRIGHT CENT
14
BRIGHT MAX
15
BRIGHT MIN

ELECTRICAL ADJUSTMENTS

TV
28
Fig. 1-1
NO.
FUNCTION
16
CONTRAST CENT
17
CONTRAST MAX
18
CONTRAST MIN
19
COLOR CENTER
20
COLOR MAX
21
COLOR MIN
22
TINT
23
SHARPNESS
24
FM LEVEL
25
LEVEL
26
SEPARATION1
27
SEPARATION2
28
TEST MONO
29
TEST STEREO
Fig. 1-2
2. BASIC ADJUSTMENTS
2-1: CUT OFF
1.
Adjust the unit to the following settings.
R.DRIVE=10, B.DRIVE=10, R.BIAS=64, G.BIAS=64,
B.BIAS=64, BRI.CENT=100, CONT.MAX=60.
2.
Place the set with Aging Test for more than 15 minutes.
3.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (01) on the remote control to
select "CUT OFF".
4.
Adjust the Screen Volume until a dim raster is obtained.
2-2: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
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 (10) 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", "R. DRIVE" or
"B. DRIVE".
6.
Adjust the VOL. UP/DOWN button on the remote control
to whiten the R. BIAS, G. BIAS, B. BIAS, R. DRIVE, and
B. DRIVE at each step tone sections equally.
7.
Perform the above adjustments 5 and 6 until the white
color is looked like a white.
2-3: FOCUS
1.
Receive the monoscope pattern.
2.
Turn the Focus Volume fully counterclockwise once.
3.
Adjust the Focus Volume until picture is distinct.
2-4: HORIZONTAL PHASE
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 (05) 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: VERTICAL SHIFT
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 (07) on the remote control to
select "V. SFT".
4.
Press the VOL. UP/DOWN button on the remote control
until the horizontal line becomes fit to the notch of the
shadow mask.
D-1