Toshiba 19A26C Manuale di servizio - Pagina 14

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Toshiba 19A26C Manuale di servizio
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 contractsection 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
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
16
CONTRAST CENT

ELECTRICAL ADJUSTMENTS

TV
28
Fig. 1-1
NO.
FUNCTION
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.
Place the set in AV MODE without signal.
2.
Using the remote control, set the brightness and contrast
to normal position.
3.
Place the set in Aging Test for more than 15 minutes.
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.
2-2: 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 15 minutes.
2.
Receive the white 100% signal 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.
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: VERTICAL SIZE
1.
Receive the monoscope pattern from the Pattern
Generator.
2.
Activate the adjustment mode display of Fig. 1-1 and
press the channel button (06) on the remote control to
select "V.SIZE".
3.
Press the VOL. UP/DOWN button on the remote control
until the SHIFT quantity of the OVER SCAN on upside
and downside becomes 10 ± 1%.
4.
Receive a broadcast and check if the picture is normal.
D-1