Terminal Function - Kenwood TKR-750 Service Manual

Final Unit (X45-3620-XX)
Connector Terminal Terminal I/O
No. No. Name
CN1 DRV I
CN2 – –
CN3 1 VTH O High temperature detector signal
To X57 2 BAT O Main DC/BACKUP status output
(A/2) 3 PDT O RF power down signal output
TX-RX 4 FAS I
unit 5 PC I
6 8T I
7 RSW –
8 E –
CN4 B O Power supply output for cooling fan
FAG O Fan ground
CN5 1 E –
2 +B O Power supply output
3 +B O Power supply output
CN6 1 Main DC I
CN7 1 BACKUP I
CN8 1 GND –
Display Unit (X54-3330-20) (A/2)
Connector Terminal Terminal I/O
No. No. Name
CN501 1 HOOK I
2 MIC I
To X54 3 MIG –
(B/2) 4 PTT I/O PTT input/TXD output
display 5 GND –
unit 6 NC –
7 SB O Power supply output after power
8 NC –
9 GND –
10 5M O Common 5V output
11 VLI I
CN502 1 MIG –
2 MIC O MIC signal output
To X57 3 VLI O Volume control output for AF signal
(B/2) 4 5C I
TX-RX 5 K4 I
unit 6 K5 I
control 7 K2 O KEY output 2
section 8 K3 O KEY output 3
9 K1 O KEY output 1
10 HOOK/RXD O Hook detection output/RXD output
11 SOE I
12 PTT/TXD I/O PTT output/TXD input

TERMINAL FUNCTION

Terminal function
TX driver input signal (Coaxial)
Reserved
output
Fan control signal input
TX power control signal input
8V input during transmission
Reserved
Ground
Ground
Power supply input (from Main DC
terminal)
Power supply input (from BACKUP
terminal)
Ground
Terminal function
Hook detection input/RXD input
MIC signal input
MIC ground
Ground
No connection
switch
No connection
Ground
Volume control input for AF signal
MIC ground
Common 5V input
KEY input 4
KEY input 5
Output enable for shift register
Connector Terminal Terminal I/O
No. No. Name
13 STB1 I
14 CLK I
15 DAT I
16 PSW O Power switch output
17 GND –
18 NC –
19 SB I
20 SB I
Display Unit (X54-3330-20) (B/2)
Connector Terminal Terminal I/O
No. No. Name
CN601 1 VLI O Volume control output for AF signal
2 5M I
To X54 3 GND –
(A/2) 4 NC –
display 5 SB I
unit 6 NC –
7 GND –
8 PTT I/O PTT output/TXD input
9 MIG –
10 MIC O MIC signal output
11 HOOK O Hook detection output/RXD output
J601 1 NC –
(Mic jack) 2 SB O Power supply output after power
3 E –
4 PTT/TXD I/O PTT input/TXD output
5 ME –
6 MIC I
7 HOOK/RXD I
8 NC –
TX-RX Unit (X57-6260-XX) (A/2) : TX-RX Section
Connector Terminal Terminal I/O
No. No. Name
CN1 – – O Use for RX helical BPF tuning (Coaxial)
CN2 – – I
CN3 – – O Use for RX frequency adjustment
CN4 – – O Use for RX MCF tuning
CN14 1 NC –
2 DET O Detection signal output
To X57 3 NC –
(B/2) 4 GND –
control 5 ASQ O Squelch signal output
section 6 RSSI O RSSI signal output
of TX-RX 7 NC –
unit 8 DP I
9 CP I
TKR-750
Terminal function
Strobe data for shift register
Clock data input
Serial data input
Ground
No connection
Power supply input after power switch
Power supply input after power switch
Terminal function
Common 5V input
Ground
No connection
Power supply input after power switch
No connection
Ground
MIC ground
No connection
switch
Ground
MIC ground
MIC signal input
Hook detection input/RXD input
No connection
Terminal function
Use for RX MCF tuning
(Coaxial)
No connection
No connection
Ground
No connection
Data input for PLL
Clock input for PLL
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