Furuno 1622 - Chapter 3. Adjustment; 3.1 Display Unit

Chapter 3. Adjustment
13
DANGER
Both display and scanner units use high voltage electricity, which
endanger human life. Precautions must always be exercised when
reaching inside the unit. (1 kVAC for LCD backlighting and 300
VDC for TX)
3.1 Display Unit
Voltage check
Remove the resin cover, and measure each voltage. It is not necessary to open the shield cover
on the DU board.
Table 3-1
Item Setting Test point Ratings Adjuster
"
5 V
TX
#
8NM
$
TP4
#"$%
TP5
#&$
4.95
'
5.05 Vdc
VR2
"
12 V
ST-BY
J1#7
#"$%
J1#5
#&$
11.2
'
12.4 Vdc
&
22 V
ST-BY
J1#10
#"$%
J1#5
#&$ &
22.9
'&
20.7 Vdc
&
6 V
ST-BY
J1#9
#"$%
J1#5
#&$ &
6.0
'&
5.0 Vdc
Figure 3-1. Test points on DU Board
J1
TP4
(
"
5V
)
VR2