Kenwood NX-840, Service Manual

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1-8 (No.RA011<Rev.001>)
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.
2.3.5 GPS Receiver Connection
2.3.5.1
Connecting the GPS receiver
(1) Soldering position
(2) Refer to FNC2 (RXD) of “2.3.7 Changing Serial Port Level”.
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.
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.
„ FNC2 (RXD)
Remove the R724 and R762 chip jumpers and solder the chip
jumpers to R725 and R756.
*1: The value in square bracket [ ] is the silk print number on
the TX-RX unit.
KCT-60
Square plug
13
14
15
10
11
12
7
8
9
4
5
6
1
2
3
12
3
Black lead
Black/
White lead
5M
FNC2
GND
POWER
DATA OUT
GROUND
TX-RX unit
GPS receiver
TX-RX unit
Component side
GND
FNC2
5M
TTL level RS-232C level
R761[5] *1 0
Ω
chip jumper. open
R767[6] *1 open 0 Ω chip jumper.
TTL level RS-232C level
R724[7], R762[9] *1 0
Ω
chip jumper. open
R725[8], R756[10] *1 open 0 Ω chip jumper.
COM Port 0
COM Port 1
TX-RX unit
Component side