JVC LT-26C31BJE Service Manual page 41

4.7 ADJUSTMENT PROCEDURE
4.7.1 CHECK ITEM
Measuring
Item
instrument
VCO (AFC) Remote control
check unit
Signal generator
IF SERVICE MENU
1. VCO
2. ATT
1-2 : SELECT
VCO(CW)
MAIN
TOO HIGH
ABOVE REF
JUST REF
BELOW REF
TOO LOW
4.7.2 VIDEO CIRCUIT
Measuring
Item
instrument
SUB Remote control
BRIGHTNESS unit
Signal generator
0% black part
Black and white pattern signal
<NG>
Test point Adjustment part
[1.IF]
1.VCO(CW)
i : EXIT
216.00MHz
SUB
The arrow position
mean AFC voltage level.
i : EXIT
Fig.3
Test point Adjustment part
[2.V/C]
9. BRIGHT
(Bright)
Set the 0% black part
to be brightest.
Black and white pattern signal
<OK>
Fig.4
Description
(1) Receive a PAL colour bar signal.
(2) Select "1. IF" from the SERVICE MENU.
(3) Select "1. VCO."
(4) Make sure that an arrow of "MAIN" is in the position
between "ABOVE REF." and "BELOW REF."on the
screen
(5) Make sure that an arrow of "SUB" is in the position
between "ABOVE REF." and "BELOW REF."on the
screen.
Description
(1) Receive a PAL black and white pattern signal
(including 0% black signal).
(2) Select "2. V/C" from the SERVICE MENU.
(3) Adjust < 9. BRIGHT > (Bright) to set the 0% black
part to be the brightest.
(4) Press the [OK] key to memorize the set value.
(No.YA014)1-41