(No.YA011)1-33
4.8.4 TUNER / IF CIRCUIT
4.8.5 FOCUS
Item
Measuring
instrument
Test point
Adjustment part
Description
IF VCO check
Remote
control unit
[1. IF]
1. VCO
• It must not adjust without inputting the RF signal.
(1) Receive the broadcast.
(2) Select 1. IF.
(3) Select < 1. VCO >.
(4) Confirm that the letter of [JUST REF.] displayed in
yellow.
Item
Measuring
instrument
Test point
Adjustment part
Description
FOCUS
Signal
generator
FOCUS1 VR
FOCUS2 VR
[In FBT]
(1) Receive the crosshatch signal.
(2) Select the ZOOM to FULL.
(3) While watching to the screen, adjust the FOCUS2
VR to the horizontal lines will be clear and in fine
detail at center of screen.
(4) Then adjust the FOCUS1 VR to the vertical lines will
be clear and in fine detail at the circumference part
of screen.
(5) Make sure that the picture is in focus even when the
screen gets darkened.
i : EXIT
YELLOW
VCO(CW) **.**MHz
MAIN
TOO HIGH
ABOVE REF.
JUST REF.
BELOW REF.
TOO LOW
FOCUS2 VR
FOCUS1 VR
SCREEN VR
FOCUS
SCREEN
Horizontal line
Vertical line