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AV42PD20ES
ADJUSTMENT
■ MONITOR
Measuring
Item
instrument
Ad justment
DC
of POWER
voltmeter
VOLTAGE
Signal
gener ator
■RECEIVER
Checking of
Remote
AFT CW VCO
control unit
1. IF
IF SERVICE MENU
1. VCO
2. AT T ON/OF F
1-2 : SELECT
Fig.1
VC O M ENU
VCO(CW)
TO O HIGH
ABO VE REF
JUST RE F
BELOW REF
TO O LO W
Fig.2
28
Test point
Ad justment part
TP-1 (+5V)
VR1 (+5)
TP-2 (# # # # )
VR3 (+170V)
TP-3 (+170V)
VR4 (+60V)
TP-4 (+60V)
1.VCO
Do no t select
this item
i : EXIT
****MHz
YELLOW
arr ow
i : EXIT
No. 51955
Description
＊ ＊ ＊ ＊ Ad justment of Vs(+170V) voltage.
1. Input the colour bar signal to RGB input terminal.
2. Connect the digital voltmeter across TP3 and TP2 (#).
3. Adjust the VR3 to s et the voltage within ±1V of the voltage (Vs
as s hown on the SERIAL LABEL) designed for the PDP module.
＊ ＊ ＊ ＊ Ad justment of Vd(+60V) voltage.
1. Input the colour bar signal to RGB input terminal.
2. Connect the digital voltmeter across TP4 and TP2 ( # ).
3. Adjust the VR4 to s et the voltage within ±1V of the voltage (Vs
as s hown on the SERIAL LABEL) designed for the PDP module.
＊ ＊ ＊ ＊ Ad justment of +5V voltage.
1. Input the colour bar signal to RGB input terminal.
2. Connect the digital voltmeter across TP1 and TP2 (#).
3. Confirm that the voltage of the TP1 and TP2 ( # ) have bec ome
5.1V±0.1V. If not, adjust the VR1 at the +5V ADJ of the POWER
PWB so that the voltage become 5.1V±0.1V.
" Under normal c onditions, no adjustment is required
confirmation adjustment.
1. Select 1.IF from the SERVICE MENU.
2. Then select 1.VCO from the 1.IF SERVICE MENU (Fig.1).
3. Receive any broadc ast (55.75MHz or 216.00MHz is best).
4. In the VCO adjustment screen, the yellow allows point (Fig.2) to
the characters. Chec k the yellow allow position where pointed to
the character from "ABOVE REF" to "BELLOW REF" (Fig.2 &
Fig.3).
＊The arrow position menu AFC voltage level.
V
TOO HIGH
(AFC)
ABOVE REF.
JUST REF.
BELOW REF.
TOO LOW.
Fig.3
t
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