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Kenwood NX-3720HG Service Manual page 15

Vhf digital transceiver, uhf digital transceiver
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2.3.3 Ignition Sense Cable (KCT-18: Option)
The KCT-18 is an optional cable for enabling the ignition
function. The ignition function lets you turn the transceiver power
on and off with the car ignition button.
2.3.3.1
Installing the KCT-18 (Ignition sense cable) in the
transceiver
13
10
7
4
1
14
11
8
5
2
15
12
9
6
3
KCT-18
2
Square plug
Ignition
line of the car
2.3.4 External Speaker (Option)
2.3.4.1
KES-5
External speaker KES-5 can be installed for KCT-60.
Connection procedure
(1) Remove the ACC. cap on the rear of the transceiver.
(2) Connect the D-sub connector of the KCT-60 to the D-sub
15-pin terminal of the transceiver.
(3) Insert the two crimp terminals of the KES-5 to pins 3 and
12 of the square plug.
(4) Connect the square plug to the 15-pin connector of the
KCT-60.
Note:
You must set up using the KPG-D3/D3N.
Before the external speaker can be used, you must assign
one of the buttons as "External Speaker", using the KPG-
D3/D3N.
13
10
7
4
1
14
11
8
5
2
15
12
9
6
3
Black/
White lead
12
3
Square plug
Black lead
2.3.5 Changing Serial Port Level
2.3.5.1
Change FNC1 (TXD) and FNC2 (RXD) of D-SUB 15-
pin connector from TTL level to RS-232C level
FNC1 (TXD /6pin ) and FNC2 (RXD /7pin ) of D-SUB 15-pin
connector are confi gured at the TTL level as the default value.
But you can change these serial port level to RS-232C level
through the RS-232C level converter IC (IC605) by confi guring
the port.
Remove the R625, R633 and R634 chip jumpers and sol-der the
chip jumpers to R605, R610 and R611.
KCT-60
KCT-60
2.3.5.2
Change FNC1 (TXD), FNC2 (RXD), FNC3 (RTS) and
FNC4 (CTS) of D-SUB 15-pin connector from TTL
level to RS-232C level
FNC1 (TXD /6pin ), FNC2 (RXD /7pin ), FNC3 (RTS /8pin ) and
FNC4 (CTS /9pin ) of D-SUB 15-pin connector are configured at
the TTL level as the default value. But you can change these
serial port level to RS-232C level through the RS-232C level
converter IC (IC605) by confi guring the port.
Remove the R623, R625, R630, R631, R633 and R634 chip
jumpers and solder the chip jumpers to R604, R605, R608,
R609, R610 and R611.
5
R613
R601
R634
6
R612
R659
R611
R633
R610
R630
R608
In the case of 5-1.
[TTL level]
R625,R633 and R634: 0ohm chip jumper.
R605, R610 and R611: open.
[RS-232C level]
R605, R610 and R611: 0ohm chip jumper.
R625, R633 and R634: open.
In the case of 5-2.
[TTL level]
R623, R625, R630, R631, R633 and R634: 0ohm chip jumper.
R604, R605, R608, R609, R610 and R611: open.
[RS-232C level]
R604, R605, R608, R609, R610 and R611: 0ohm chip jumper.
R623, R625, R630, R631, R633 and R634: open.
2.3.6 Changing of Signal Type
2.3.6.1
Change signal output of D-SUB connector from
DEO to AFO
The output (4pin) of D-SUB 15-pin connector is confi gured at the
DEO as the default value.
Remove the R613 chip jumper and solder the clip jumper to
R612.
2.3.6.2
Change signal input of D-SUB connector from DI to
MI2
The input (5pin) of D-SUB 15-pin connector is confi gured at the
DI as the default value.
Remove the R659 chip jumper and solder the chip jumper to
R601.
7
R625
8
R605
11
R631
12
R609
15
R623
16
R604
(No.RA054<Rev.001>)1-15

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