Kenwood TK-785 Service Manual page 7

1-2. KCT-19 Accessory Port Function
No. (A) No. (B,C,D,E) Name
1 D-2 AHK No function.
2 D-5 ME Microphone ground.
AM Speaker audio mute input.
3 D-3 IGN Ignition sense input.
4 D-1 DEO Receiver detector output.
5 D-6 MI External microphone input.
TXS Transmitter sense output.
6 B-2 E Ground.
7 B-3 SB Switched B+, DC 13.2V (E), 13.6V
(K,M) output. Maximum 0.75A
8 D-7 PTT No function.
9 D-4 DI Data modulation input.
10 B-1 HOR Horn alert/call output.
11 D-8 SQ No function.
12 C-1 SP Speaker audio output.
13 E-1 CN2 LOK No function.
and
CN4
CN2 AM Speaker mute input.
14 E-2 CN4 RXD Serial control data input.
CN2 MM MIC mute input, active high.
15 E-3 CN4 TXD Serial control data output.
CN2 DTC No function.
*1 LOK No function.
TXS Transmitter sense output,
Active high
FSW Foot switch input, active low
Note
*1 : The functions of A-2, A-5, A-13 (when connector E is connected
to CN2), and A-15 (when connector E is connected to CN2) are
changed as described in the jumper chart.
*2 : The functions of A-13, A-14 and A-15 are changed if the con-
nector E is connected to CN2 or CN4 of the radio.
No. CN2
E-1 LOK/AM
E-2 MM
E-3 LOK/DTC/TXS/FSW
· Connect CN6 of the radio to connector C of the KCT-19 instead of
to the internal speaker connector, if use external speaker.
INSTALLATION
Function Note
*1
*1
*1
*2
*2
*2
CN4
LOK
RXD
TXD
1-3. Data Equipment Connection
The jumpers must be set to either one for each function.
Otherwise, the radio will not work properly.
ME/AM
R12 (0Ω) R167 (0Ω)
Yes No AM Default
No Yes ME
MI/TXS
R94 (0Ω) R24 (0Ω)
Yes No TXS Default
No Yes MI
LOK/AM
R5 (0Ω) R6 (0Ω)
Yes No AM
No Yes LOK Default
DTC/LOK/TXS/FSW
R168 R84 R51 R13
(0Ω) (0Ω) (0Ω) (0Ω)
No No No Yes LOK
Yes No No No DTC
No No Yes No TXS
No Yes No No FSW
Note : The following parts are not installed at the time of
shipping; R5,R13,R24,R51,R84,R167
R13
TX-RX unit (A/2)
Foil side view
R84
TX-RX unit (A/2)
Component side view
Fig. 3-1 K,E type
TK-785
Function / Default
Function / Default
Function / Default
Function / Default
Default
R6
R5
7