Toshiba 13A25 Manual de servicio - Página 19

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Toshiba 13A25 Manual de servicio
1.
BEFORE MAKING ELECTRICAL
ADJUSTMENTS
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. Befor 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. Synchro Scope
2. Digital Voltmeter
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
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
19
Fig. 1-1
NO.
FUNCTION
16
CONTRAST CENT
17
CONTRAST MAX
18
CONTRAST MIN
19
COLOR CENT
20
COLOR MAX
21
COLOR MIN
22
TINT
23
SHARPNESS
24
FM LEVEL
25
LEVEL
26
SEPARATION 1
27
SEPARATION 2
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=120, CONT.MAX=40.
2.
Place the set in 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: FOCUS
1.
Receive the monoscope pattern.
2.
Turn the Focus Volume fully counterclockwise once.
3.
Adjust the Focus Volume until picture is distinct.
2-3: WHITE BALANCE
NOTE: Adjust after performing CUT OFF adjustment.
1.
Place the set in Aging Test for more than 10 minutes.
2.
Receive the white 100% signal from the Pattern
Generator.
3.
Using the adjustment 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.
Using the VOL. UP/DOWN button on the remote control,
adjust the R.BIAS.
6.
Press the CH. UP/DOWN button on the remote control to
select the "R.DRIVE", "B.DRIVE", "G.BIAS" or "B.BIAS".
7.
Using the VOL. UP/DOWN button on the remote control,
adjust the R.DRIVE, B.DRIVE, G.BIAS or B.BIAS.
8.
Perform the above adjustments 6 and 7 until the white
color is achieved.
2-4: SUB TINT/SUB COLOR
Receive the color bar pattern. (RF Input)
1.
Connect the oscilloscope to TP023.
2.
Activate the adjustment mode display of Fig. 1-1 and
3.
press the channel button (22) on the remote control to
select "TINT".
Press the VOL. UP/DOWN button on the remote control
4.
until the section "A" becomes as straight line.
(Refer to Fig. 2-1)
Connect the oscilloscope to TP022.
5.
Activate the adjustment mode display of Fig. 1-1 and
6.
press the channel button (19) on the remote control to
select "COL.CENT".
Press the VOL. UP/DOWN button on the remote control
7.
until the red color level is adjusted to 110 ±10% of the
white level. (Refer to Fig. 2-2)
Receive the color bar pattern. (Audio Video Input)
8.
Press the TV/VIDEO button on the remote control to set
9.
to the AV mode. Then perform the above adjustments
2~7.
D-1
13A25/13A25C