Tx-Rx Unit(X57-444X-Xx) (A/3) - Kenwood TK-250 Service Manual

TK-250
TERMINAL FUNCTION
TX-RX UNIT(X57-4440-10) (B/3) : Contra! section
Connector No.
Pin No.
Pin Name
1/0
Function
1 TXAI I TX AF signal input 2 R XAI I RX AF signal input 3 SB
0
Power output after power switch
E
-
GND
T/R
0
Normally : 5V , Transmit : OV
EN2
0
Scrambler enable data input
RXAO
0
RX AF signal output
TXAO
0
TX AF signal output OT/DO
0
Binary code select 1 tor scrambler
CT/D1
0
Binary code select 2 tor scrambler
TX-RX UNIT(X57-4440-10) (B/3) : Contra! section
Connector No.
Pin No.
Pin Name 1/0
Function
1 DKEY1
I DTMF KEY DKEY2 I DTMF KEY
DKEY3
I
DTMF KEY
DKEY4 I DTMF KEY
DKEY5
I DTMF KEY
DKEY6
I DTMF KEY DKEY7 I DTMF KEY
DKEY8
I DTMF KEY
TX-RX UNIT(X57-4440-10) (B/3) : Contra! section
Connector No.
Pin No. Pin Name 1/0 Function 1 5M
0
5V TD
0
Serial control signal output
RD I
Serial control signal input
RT I Reset signal input E
-
GND
B
0
Power output after passing through the tuse
SB I
Power input after power switch
AE
-
GND
Al I
AF signal input after volume
A2
0
AF signal output tor volume
TX-RX
UNIT(X57-444 0-1 0)
(B/3) : Contra! section
Connector No.
Pin No. Pin Name 1/0 Function
1 SP
0
Output tor intemal speaker
E
-
GND
44