Toshiba 14AF45C, 20AF45C Servicehandleiding - Pagina 19
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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. LINERITY
09
VS CORRECTION
10
R DRIVE
11
B DRIVE
12
R CUT OFF
13
G CUT OFF
14
B CUT OFF
15
BRIGHT MAX
16
BRIGHT CENT
17
BRIGHT MIN
18
CONTRAST MAX
ELECTRICAL ADJUSTMENTS
TV
36
Fig. 1-1
NO.
FUNCTION
19
CONTRAST CENT
20
CONTRAST MIN
21
COLOR MAX
22
COLOR CENTER
23
COLOR MIN
24
TINT
25
SHARPNESS
26
Cb DELAY FINE
27
Cr DELAY FINE
28
Cb PEDESTAL ADJ
29
Cr PEDESTAL ADJ
30
PARABOLA
31
CORNER
32
TRAPWZIUM
33
LEVEL
34
SEPARATION1
35
SEPARATION2
88
READ DATA
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
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.
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 CUT OFF".
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.
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.
2-5: HORIZONTAL POSITION
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.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.
D-1
14AF45/14AF45C