External Speaker; Changing Serial Port Level; Changing Of Signal Type - Kenwood NX-720 Service Manual

NX-720(G)/720
4. External Speaker (Option)
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-141D.
Before the external speaker can be used, you must as-
sign one of the keys as "External Speaker", using the
KPG-141D.
13 10 7 4 1
14 11 8 5 2
15 12 9 6 3
Black/
White lead
12
3
Black lead

5. Changing Serial Port Level

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 (IC516)
by confi guring the port.
Remove the R664, R635 and R662 chip jumpers and sol-
der the chip jumpers to R666, R633 and R665.
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 con-
figured 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 (IC516) by confi guring the port.
8
INSTALLATION
KCT-60
Square plug
Remove the R664, R635, R662, R659, R658 and R632
chip jumpers and solder the chip jumpers to R666, R633,
R665, R663, R660 and R630.
+
5
R664 R635 R662
6
R666 R633 R665
IC703
5
R664 R635 R662 R659 R658 R632
6
IC703
■ In the case of 5-1.
[TTL level]
R664,R635 and R662: 0 chip jumper.
R666, R633 and R665: open.
[RS-232C level]
R666, R633 and R665: 0 chip jumper.
R664, R635 and R662: open.
■ In the case of 5-2.
[TTL level]
R664, R635, R662, R659, R658 and R632: 0 chip
jumper.
R666, R633, R665, R663, R660 and R630: open.
[RS-232C level]
R666, R633, R665, R663, R660 and R630: 0 chip
jumper.
R664, R635, R662, R659, R658 and R632: open.

6. Changing of Signal Type

6-1.Change signal output of D-SUB connector
from DEO to AFO
The output (4pin) of D-SUB 15-pin connector is confi g-
ured at the DEO as the default value.
Remove the R796 chip jumper and solder the clip jumper
to R798.
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 R797 chip jumper and solder the chip jump-
er to R799.
15
R659 R658 R632
R663 R660 R630 16
19
R797
R796
20
R798 R799
15
16
19 TX-RX unit
R796 R797
20
Component side