Acc 25 Pin D-Sub Connector Terminal Function; Acc 15 Pin Connector Terminal Function - Kenwood TKR-750 Service Manual

Connector Terminal Terminal I/O
No. No. Name
3 8CL I
4 CV I
5 9CL I
6 MO I
CN351 1 VO O TX VCO output
2 GND –
ACC 25 pin D-sub Connector
Connector Terminal Terminal I/O
No. No. Name
1 NC –
2 RXD2 I
3 TXD2 O Serial data from radio
4 AI1 I
5 AI2 I
6 AI3 I
7 DG –
8 TD I
9 TA I
10 RD O RX data output (voice & data)
11 RA O RX audio output (voice)
12 RXG –
TERMINAL FUNCTION
Terminal function
8V input through the ripple filter
RX PLL lock voltage
9V input through the ripple filter
Modulation signal input
Ground
Terminal function
No connection
Serial data to radio
Programmable function input 1
Programmable function input 2
Programmable function input 3
Control line ground
TX data input (data or signalling)
Input impedance: 600Ω
Coupling: AC coupling
Deviation: 0.75kHz (wide)/
0.35kHz (Narrow)
(100Hz 0.5Vp-p input)
TX audio input (voice)
Input impedance: 600Ω
Coupling: AC coupling
Frequency response: Pre-
emphasis curve
Deviation: 60% deviation
(1kHz 280mVrms ± 25mV input)
Output impedance: 1kΩ or less
Coupling: AC coupling
Non-squelched
Frequency response: ±2.5dB at
10~3000Hz
Output level: 70~90mVrms
(standard modulation)
Output impedance: 1kΩ or less
Coupling: AC coupling
Squelched
Frequency response: De-
emphasis curve
Output level: 360~440mVrms
(standard modulation)
RX signal ground
(for RA,RD ground only)
Connector Terminal Terminal I/O
No. No. Name
13 SPM I
14 NC -
15 EMON I
16 EPTT I
17 SC O Squelch control output
18 NC -
19 TXG -
20 AIO1 I/O Programmable function input/output 1
21 AIO2 I/O Programmable function input/output 2
22 AIO3 I/O Programmable function input/output 3
23 AIO4 I/O Programmable function input/output 4
24 AIO5 I/O Programmable function input/output 5
25 AIO6 I/O Programmable function input/output 6
13 12 11 10 9 8 7 6 5 4 3 2 1
25 24 23 22 21
ACC 15 pin Connector
Connector Terminal Terminal I/O
No. No. Name
1 SB O Power supply output after power
2 SB O Power supply output after power
3 NC –
4 GND –
5 GND –
6 SPG –
7 RD O RX data output (Equal to D-sub
8 RSSI O RSSI output (Analog signal output)
9 SPI I
10 AO1 O Auxiliary output 1
11 AO2 O Auxiliary output 2
12 SPO O External speaker output
13 AO3 O Auxiliary output 3
14 AO4 O Auxiliary output 4
15 AO5 O Auxiliary output 5
TKR-750
Terminal function
Speaker mute signal input
"L": Mute on
No connection
External monitor switch input
"L": Monitor on, "H": Monitor off
External press-to-talk switch input
"L": PTT on, "H": PTT off
"L": Busy, "H": Not busy
No connection
TX signal ground
(for TA,TD ground only)
20 19 18 17 16 15 14
Terminal function
switch; 1A maximum
switch; 1A maximum
No connection
Ground
Ground
Speaker ground
connector terminal No. 10.)
Internal speaker input
Open collector. Low : 150mA max.
Open collector. Low : 150mA max.
13 10 7 4 1
14 11 8 5 2
15 12 9 6 3
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