1-20 (No.YA262)
4.8
ADJUSTMENT PROCEDURE
4.8.1 CHECK ITEM
4.8.2 FOCUS
Item
Measuring
instrument
Test point
Adjustment part
Description
B1 VOLTAGE
DC voltmeter
Remote
control unit
X connector
1-pin:TP-91(B1)
5-pin:TP-E
[POWER & DEF PWB]
[2.V/C]
1.RGB BLK
(1) Receive the any broadcast.
(2) Select
2. V/C
from the SERVICE MODE.
(3) Select
< 1. RGB BLK >
.
(4) Press the
[FUNCTION
]
key to find the cut off
screen (Black screen).
(5) Connect a DC voltmeter to
1-pin
and
5-pin
of X
connector.
(6) Make sure that the voltage is
DC139V
±
2.0V
.
(7) Press the
[FUNCTION
]
key to return to
SERVICE MODE.
HIGH VOLTAGE
HV voltmeter
Remote
control unit
CRT anode
Chassis GND
[2.V/C]
1.RGB BLK
(1) Receive the any broadcast.
(2) Select
2. V/C
from the SERVICE MODE.
(3) Select
< 1. RGB BLK >
.
(4) Press the
[FUNCTION
]
key to find the cut off
screen (Black screen).
(5) Connect the HV voltmeter to CRT ANODE and
chassis GND. (Ground side is connected previously)
(6) Make sure that the voltage is
DC 31.0kV (+1kV/-1.5kV)
.
(7) Press the
[FUNCTION
]
key to return to
SERVICE MODE.
NOTE:
Remove the probe before removing the earth clip.
IF VCO
Remote
control unit
[1.IF]
1.VCO
• Under normal conditions, no adjustment is required.
• It must not adjust without broadcast signal.
(1) Receive the any broadcast.
(2) Select
1.IF
from the SERVICE MODE.
(3) Select
< 1.VCO >
.
(4) Check the "
←
" position between the ABOVE REF.
and BELOW REF.
Item
Measuring
instrument
Test point
Adjustment part
Description
FOCUS
Signal
generator
FOCUS VR
[In HVT]
(1) Receive the crosshatch signal.
(2) Set the ZOOM mode to FULL.
(3) While looking at the screen, adjust the FOCUS VR
to the vertical and horizontal lines will be clear and
infine detail.
(4) Make sure that the picture is in focus even when the
screen gets darkened.
NU
TOO HIGH
ABOVE REF
JUST REF
BELOW REF
TOO LOW
VCO(CW)
**** MHz
1. VCO
IF SERVICE ME
2. ATT ON/OFF
HVT
SCREEN
FOCUS
