1-18 (No. 52197)
4.6 ADJUSTMENT PROCEDURE
4.6.1 B1 POWER SUPPLY
Item
Measuring
instrument
Test point
Adjustment part
Description
B1 POWER
SUPPLY
check
Signal
generator
DC voltmeter
B1 (pin 1)
GND (pin 5)
[CN00S
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
4.6.2 FOCUS ADJUSTMENT
Signal
generator
Notes:
•
Set PICTURE MODE (VSM) to “BRIGHT”.
•
The final adjustment of CONVERGENCE must be done
after the FOCUS adjustment. (CONVERGENCE is changed
by FOCUS adjustment.)
When makes difference by FOCUS adjustment, should be
reconfirming PURITY adjustment.
(1) Receive a cross-hatch signal.
(2) While looking at the screen centre, adjust the
FOCUS VR
so that the vertical and horizontal lines will be clear and in
fine detail.
(3) Make sure that the picture is in focus even when the screen
gets darkened.
IF VCO
adjustment
[1. IF]
1. VCO (CW)
Item
Measuring
instrument
Test point
Adjustment part
Description
4.6.3 IF CIRCUIT ADJUSTMENTS
Remote
control unit
Note:
•
Under normal conditions, no adjustment is required.
(1) Select
1. IF
from the SERVICE MENU.
(2) Select
1. VCO
.
(3) Receive a broadcast signal.
(4) Check the characters colour of the
BELOW 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 noise
and any decrease below it produces 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
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)
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