Toshiba 14AF46C Manuel d'entretien - Page 20

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Toshiba 14AF46C Manuel d'entretien

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. 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. 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. LIN
09
VS. CORR
10
R. DRV
11
B. DRV
12
R. BIAS
13
G. BIAS
14
B. BIAS
15
BRI. MAX
16
BRI. CENT
17
BRI. MIN

ELECTRICAL ADJUSTMENTS

TV
36
Fig. 1-1
NO.
FUNCTION
18
CONT. MAX
19
CONT. CENT
20
CONT. MIN
21
COL. MAX
22
COL. CENT
23
COL. MIN
24
TINT
25
SHARPNESS
26
CB DL
27
CR DL
28
CB PED
29
CR PED
30
PARABOLA
31
CORNER
32
TRAPWZIU
33
LEVEL
34
SEP1
35
SEP2
36
X-RAY
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 TP003.
Adjust the VR502 until the digital voltmeter is 115 ± 1.0V.
3.
2-2: CUT OFF
1.
Place the set in Aging Test for more than 15 minutes.
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 (01) on the remote control to
select "CUT OFF".
4.
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 10 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 selectt "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. DRV and
R. DRV 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 Generator
with burst on.
10.
If the picture is too much green. Activate the adjustment mode
display of Fig. 1-1 and press the channel button
(28) 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
(29) 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 the monoscope pattern.
2.
Turn the Focus Volume fully counterclockwise once.
3.
Adjust the Focus Volume until picture is distinct.
D-1
14AF46/14AF46C