JVC InteriArt LT-26C31BC, Руководство по обслуживанию

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1-42 (No.YA169)
4.7 ADJUSTMENT PROCEDURE
4.7.1 CHECK ITEM
4.7.2 VIDEO CIRCUIT
Item
Measuring
instrument
Test point Adjustment part Description
VCO (AFT)
check Remote control
unit
Signal generator
[1.IF]
1.VCO(CW) (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.
Fig.3
Item
Measuring
instrument
Test point Adjustment part Description
SUB
BRIGHTNESS Remote control
unit
Signal generator
[2.V/C]
9. BRIGHT
(Bright) (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.
Fig.4
1. VCO
2. ATT
i : EXIT
IF SERVICE MENU
1-2 : SELECT
i : EXIT
TOO HIGH
ABOVE REF
JUST REF
BELOW REF
TOO LOW
VCO(CW) 216.00MHz
MAIN SUB
The arrow position
mean AFT voltage level.
Set the 0% black part
to be brightest.
<OK>
0% black part
<NG>
Black and white pattern signal Black and white pattern signal