Kenwood TKR-750 Service Manual page 47

Connector Terminal Terminal I/O
No. No. Name
14 GND –
15 SOE O Output enable for shift register
16 TEMP I
17 PSW O Power switch output
18 BUP I
19 LD2 O Latch data output for DA converter
20 FWD I
21 STB4 O Strobe output for shift register
22 CK O Clock output
23 DT O Data output
24 LDT I
25 LDR I
26 EPT O Enable output for TX PLL
27 EPR O Enable output for RX PLL
28 CP O Clock output for PLL
29 DP O Data output for PLL
30 NC –
31 RSSI I
32 ASQ I
33 GND –
34 NC –
35 DET I
36 NC –
CN603 1 SB O Power supply output after power
To ACC 2 SB O Power supply output after power
15 pin
connector 3 GND –
4 GND –
CN604 1 AO5 O Auxiliary output 5 (FPU selectable)
2 AO4 O Auxiliary output 4 (FPU selectable)
To ACC 3 AO3 O Auxiliary output 3 (FPU selectable)
15 pin 4 SPO O External speaker output
connector 5 SPO O External speaker output
6 AO2 O Auxiliary output 2 (FPU selectable)
7 AO1 O Auxiliary output 1 (FPU selectable)
8 SPI I
9 RSSI O RSSI signal output
10 RD O RX data output
11 SPG –
12 SPG –
CN605 1 SP O Internal speaker AF output
2 SPG –
CN606 1 NC –
2 NC –
To ACC 3 SPM I
25 pin 4 IO6 I/O Programable I/O 6
D-sub 5 RXG –
connector 6 IO5 I/O Programable I/O 5
7 RA O RX audio output (voice)
8 IO4 I/O Programable I/O 4
TERMINAL FUNCTION
Terminal function
Ground
High temperature detector signal input
Backup signal input
RF power down signal input
Lock detector for TX PLL
Lock detector for RX PLL
No connection
RSSI signal input
Squelch signal input
Ground
No connection
Detection signal input
No connection
switch
switch
Ground
Ground
Internal speaker input
External speaker ground
External speaker ground
Internal speaker ground
No connection
No connection
Speaker mute signal input
RX signal ground
Connector Terminal Terminal I/O
No. No. Name
9 RD O RX data output (voice & data)
10 IO3 I/O Programable I/O 3
11 TA I
12 IO2 I/O Programable I/O 2
13 TD I
14 IO1 I/O Programable I/O 1
15 DG –
16 TXG –
17 AI3 I
18 NC –
19 AI2 I
20 SC O Squelch control output
21 AI1 I
22 EPTT I
23 TXD2 O RS-232C output signal (for FPU)
24 EMON I
25 RXD2 I
26 NC –
27 NC –
28 NC –
29 NC –
30 NC –
VCO (RX) Unit (X58-4780-10)
Connector Terminal Terminal I/O
No. No. Name
CN300 1 FIN I
2 5C I
3 LDR O Lock detector for RX PLL
4 EPR I
5 DP I
6 CP I
7 REF I
CN350 1 GND –
2 SRR I
3 8CL I
4 CV I
5 9CL I
6 NC –
CN351 1 VO O RX VCO output
2 GND –
VCO (TX) Unit (X58-4790-10)
Connector Terminal Terminal I/O
No. No. Name
CN300 1 FIN I
2 5C I
3 LDT O Lock detector for TX PLL
4 EPT I
5 DP I
TKR-750
Terminal function
TX audio input (voice)
TX data input (data or signaling)
Control line ground
TX signal ground
Auxiliary input 3 (FPU selectable)
No connection
Auxiliary input 2 (FPU selectable)
Auxiliary input 1 (FPU selectable)
External press-to-talk switch input
External monitor switch input
RS-232C input signal (for FPU)
No connection
No connection
No connection
No connection
No connection
Terminal function
Prescaler RF signal input
Common 5V input
Enable input for RX PLL
Data input for PLL
Clock input for PLL
Reference frequency signal input
Ground
Switching signal input for RX VCO
8V input through the ripple filter
RX PLL lock voltage
9V input through the ripple filter
No connection
Ground
Terminal function
Prescaler RF signal input
Common 5V input
Enable input for TX PLL
Data input for PLL
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