Icom IC-7200

18
97
BAND VOLTAGE MODIFICATION
■ Band voltage modification
If you want to connect an external unit which can be
controlled by the band voltage from [ACC] connector,
the modification is necessary as at right.
The band voltage appears from pin 5 of [ACC] con-
nector after modification (q) is completed, or the
regulated 8 V appears from pin 1 of [ACC] connector
after modification (w) is completed.
Performing this modification is the customer’s re-
sponsibility. Icom does not guarantee this modifica-
tion’s result.
CAUTION: Disconnect the DC power cable from
the transceiver before any work on the transceiver.
Bridge these
solder pads
IC-7200’s bottom view with
bottom cover is opened.
RF unit
Front panel
q BAND
w 8 V
• Band voltage generator circuit
The below circuit is just for reference.
1.9 MHz
Rotary
switch
Diode
VR 4.7 kø
4.7 kø
4.7 kø
100 µH
100 µH
4700 pF
4700 pF
4700 pF
BAND
8 V
8 V
External
power souce
ACC socket of
an optional unit
GND
10 kø
10 kø
22 kø
VR
Open
VR
VR
OR
3.5 MHz
7 MHz
10 MHz
14 MHz
18/21 MHz
24/28 MHz
1
2
3
4
7
6
5
The following band voltage table is for reference only.
Please adjust and confirm against the actual operat-
ing condition.

BAND VOLTAGE

1.9

MHz Non-adjustment

3.5

MHz 6.1 V

7

MHz 5.1 V

10

MHz Non-adjustment

14

MHz 4.1 V

18/21

MHz 3.1 V

24/28

MHz 2.1 V