Rx Vco Unit (X58-4780-10) Terminal Function; Tx Vco Unit (X58-4790-10) Terminal Function - Kenwood TKR-750 Service Manual

TKR-750
Connector Terminal Terminal I/O
No. No. Name
19 LD2
20 FWD
21 STB
22 CK
23 DT
24 LDT
25 LDR
26 EPT
27 EPR
28 CP
29 DP
30 SC
31 RSSI
32 ASQ
33 GND
34 NC
35 DET
36 NC
CN603 1 SB
To ACC 2 SB
15 pin 3 GND
connector 4 GND
CN604 1 AO5
2 AO4
To ACC 3 AO3
15 pin 4 SPO
connector 5 SPO
6 AO2
7 AO1
8 SPI
9 RSSI
10 RD
11 SPG
12 SPG
CN605 1 SPO
2 SPG
CN606 1 NC
2 NC
To ACC 3 SPM
25 pin 4 IO6
D-sub 5 RXG
connector 6 IO5
7 RA
8 IO4
9 RD
10 IO3
11 TA
12 IO2
13 TD
48
TERMINAL FUNCTION
Terminal function
O Latch data output for DA converter
I RF power down signal input
O Strobe output for shift register
O Clock output
O Data output
I Lock detector for TX PLL
I Lock detector for RX PLL
O Enable output for TX PLL
O Enable output for RX PLL
O Clock output for PLL
O Data output for PLL
I Squelch control signal input
I RSSI signal input
I Squelch signal input
– Ground
– No connection
I Detection signal input
– No connection
O Power supply output after power switch
O Power supply output after power switch
– Ground
– Ground
O Auxiliary output 5 (FPU selectable)
O Auxiliary output 4 (FPU selectable)
O Auxiliary output 3 (FPU selectable)
O External speaker output
O External speaker output
O Auxiliary output 2 (FPU selectable)
O Auxiliary output 1 (FPU selectable)
I Internal speaker input
O RSSI signal output
O RX data output
– External speaker ground
– External speaker ground
O Internal speaker AF output
– Internal speaker ground
– No connection
– No connection
I Speaker mute signal input
I/O Programable I/O 6
– RX signal ground
I/O Programable I/O 5
O RX audio output (voice)
I/O Programable I/O 4
O RX data output (voice & data)
I/O Programable I/O 3
I TX audio input (voice)
I/O Programable I/O 2
I TX data input (data or signaling)
Connector Terminal Terminal I/O
No. No. Name
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 –
RX VCO 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 –
TX VCO 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
6 CP I
7 REF I
CN350 1 GND –
2 STT I
Terminal function
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
Clock input for PLL
Reference frequency signal input
Ground
Switching signal input for TX VCO