Kenwood NX-740H Service Manual page 8

2.3.4.2 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-175D.
Before the external speaker can be used, you must assign
one of the keys as "External Speaker", using the KPG-
175D.
• This also applicable to public address provide you must
assign one of the keys as "Public Address", using the
KPG-175D.
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 GPS Receiver Connection
2.3.5.1 Connecting the GPS receiver
(1) Soldering position
TX-RX unit
FNC2
5M
GND
TX-RX unit
Component side
GND
(2) Refer to FNC2 (RXD) of "2.3.7 Changing Serial Port Level".
1-8 (No.RA010<Rev.001>)
KCT-60
DATA OUT
POWER
GROUND
FNC2
5M
2.3.6 Extended Function: COM Port 0 and COM Port 1
Location of COM Port 0 and COM Port 1 of the transceiver is
shown below.
COM Port 0
You must configure the transceiver COM Port 0 and COM Port 1
using the KPG-175D.
When you set as "Data", the Function port 1 and 2 will be auto-
matically fixed as Input ports.
The reason for this is because function port 1 (TXD) and 2 (RXD)
share the same circuit path of TXD and RXD line.
2.3.7 Changing Serial Port Level
2.3.7.1 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 con-
nector 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 (IC704) by configuring the port.
FNC1 (TXD)
Remove the R761 chip jumper and solder the clip jumper to
R767.
TTL level
R761[5] *1 0Ω chip jumper.
R767[6] *1 open
FNC2 (RXD)
Remove the R724 and R762 chip jumpers and solder the chip
jumpers to R725 and R756.
R724[7], R762[9] *1 0Ω chip jumper.
R725[8], R756[10] *1 open
*1: The value in square bracket [ ] is the silk print number on
the TX-RX unit.
TX-RX unit
Component side
COM Port 1
RS-232C level
open
0Ω chip jumper.
TTL level RS-232C level
open
0Ω chip jumper.