1-18 (No. YA104)
4.7 ADJUSTMENT PROCEDURE
4.7.1 B1 VOLTAGE
Item
Measuring
instrument
Test point
Adjustment part
Description
B1 VOLTAGE
check
Signal
generator
DC voltmeter
B1 (pin 1)
GND (pin 5)
[CN00X
connector
in MAIN
PWB]
(1) Receive a black and white signal.
(2) Connect a DC voltmeter between B1 and GND (between
pins 1 and 5 of the connector CN00S).
(3) Make sure that the voltage is
DC134.5V ± 2V
.
FOCUS
adjustment
FOCUS VR
[In HVT]
Item
Measuring
instrument
Test point
Adjustment part
Description
4.7.2 FOCUS ADJUSTMENT
Signal
generator
Notes:
•
Set PICTURE MODE (VSM) to “BRIGHT”.
[AV-29WX14/G, AV-29WX14/S, AV-29WX24/L only]
•
The final adjustment of CONVERGENCE must be done
after the FOCUS adjustment. (CONVERGENCE is affected
by the FOCUS adjustment.)
If any aeviation in CONVERGENCE is found, PURITY must
be adjusted to restore the convergence.
(1) Receive a crosshatch signal.
(2) Adjust the
FOCUS VR
so that the vertical and horizontal
lines will be clear and in fine detail on the screen.
(3) Make sure that the picture is in focus even when the screen
gets darkened.
IF VCO
check
[1. IF]
1. VCO (CW)
Item
Measuring
instrument
Test point
Adjustment part
Description
4.7.3 IF CIRCUIT ADJUSTMENTS
Remote
control unit
Note:
•
Under normal conditions, no adjustment is required.
(1) Receive a broadcast signal.
(2) Select
1. IF
from the SERVICE MENU.
(3) Select
1. VCO
.
(4) Check the characters colour of the
JUST REFERENCE
displayed to
yellow
.
(5) Press the [DISPLAY] key three times to return to normal
screen.
DELAY POINT
(AGC
TAKE-OVER)
adjustment
[1. IF]
2. DELAY POINT
Remote
control unit
(1) Receive a black and white broadcast signal (colour off).
(2) Select
1. IF
from the SERVICE MENU.
(3) Select
2. DELAY POINT
.
(4) Adjust in order to eliminate any noise or beat from the
image. Any increase above the initial value produces the
noise and any decrease below it produces the beat.
(5) Press the [DISPLAY] key three times to return to the normal
screen.
(6) Turn to other channels and make sure that there are no
irregularities.
TOO HIGH
ABOVE REFERENCE
JUST REFERENCE
BELOW REFERENCE
TOO LOW
VCO (CW)
.
MHz
DISPLAY : EXIT
Receiving frequency
YELLOW
Initial setting value
Adjustment item
NTSC 3.58 OTHERS
VHF UHF VHF UHF
2. DELAY POINT
(AGC TAKE-OVER)
30
30
30
30