Terminal Function; Final Unit (X45-373X-Xx) Terminal Function; Display Unit (X54-3330-21) (A/2) Terminal Function; Tx-Rx Unit (X57-695X-Xx) (A/2): Tx-Rx Section Terminal Function - Kenwood TKR-750 Service Manual

TKR-750
Final Unit (X45-373X-XX)
Connector Terminal Terminal I/O
No. No. Name
CN1 DRV
CN3 1 TMP
To X57 2 BUP
(A/2) 3 PDT
TX-RX 4 FAS
unit 5 PC
6 8T
7 NC
8 GND
CN4 FAB
FAG
CN5 1 E
2 B
3 B
CN6 1 Main DC
CN7 1 BACKUP
CN8 1 GND
Display Unit (X54-3330-21) (A/2)
Connector Terminal Terminal I/O
No. No. Name
CN501 1 HK
2 MIC
To X54 3 MIG
(B/2) 4 PTT
display 5 GND
unit 6 NC
7 SB
8 NC
9 GND
10 5M
11 VLI
CN502 1 MIG
2 MIC
To X57 3 VLI
(B/2) 4 5C
TX-RX 5 K4
unit 6 K5
control 7 K2
section 8 K3
9 K1
10 HK/RXD
11 SOE
12 PTT/TXD I/O PTT output/TXD input
46

TERMINAL FUNCTION

Terminal function
I TX driver input signal (Coaxial)
O High temperature detector signal
output for fan action
O Main DC/BACKUP status output
O RF power down signal output
I Fan control signal input
I TX power control signal input
I 8V input during transmission
– Reserved
– Ground
O Power supply output for cooling fan
O Fan ground
– Ground
O Power supply output
O Power supply output
I Power supply input (from Main DC
terminal)
I Power supply input (from BACKUP
terminal)
– Ground
Terminal function
I Hook detection input/RXD input
I MIC signal input
– MIC ground
I/O PTT input/TXD output
– Ground
– No connection
O Power supply output after power switch
– No connection
– Ground
O Common 5V output
I Volume control input for AF signal
– MIC ground
O MIC signal output
O Volume control output for AF signal
I Common 5V input
I KEY input 4
I KEY input 5
O KEY output 2
O KEY output 3
O KEY output 1
O Hook detection output/RXD output
I 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 (X54-3330-21) (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 HK O Hook detection output/RXD output
J601 1 NC –
(Mic jack) 2 SB O Power supply output after power switch
3 GND –
4 PTT/TXD I/O PTT input/TXD output
5 MIG –
6 MIC I
7 HK/RXD I
8 NC –
TX-RX Unit (X57-695X-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 SC O Squelch control signal output
unit 8 DP I
9 CP I
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
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
Data input for PLL
Clock input for PLL