Terminal Function - Kenwood TM-281A Service Manual

TX-RX unit (X57-8130-XX A/2)
: TX-RX Section
Pin No. Name I/O
CN702
1 SPGND -
2 SPGND -
3 SPOUT O
4 SPOUT O
5 8C O
6 RXD I
7 PTT I
8 VOL I
9 MICKEY I
10 5C O
11 CM I
12 ENCA I
13 ENCB I
14 DI I
15 DO O
16 CE O
17 CL O
18 BRI O
19 POWER I
20 MIC I
21 ME -
22 GND -
J701 (EXT. SP jack)
1 EXT SP O
2 GND -

TERMINAL FUNCTION

Function
AF GND
AF GND
AF out
AF out
8V DC supply
RXD/ PC serial data
PTT/ PC serial data
Volume
Microphone key
5V DC supply
Microphone key check
Encoder A
Encoder B
Data from LCD driver
Data for LCD driver
Chip enable for LCD driver
Clock for LCD driver
LCD brightness control
Power key
Microphone
GND
GND
External speaker
GND
TX-RX unit (X57-8130-XX B/2)
: Display Section
Pin No. Name I/O
CN901
1 SPGND -
2 SPGND -
3 SPOUT I
4 SPOUT I
5 8C I
6 RXD O
7 PTT O
8 VOL O
9 MICKEY O
10 5C I
11 CM O
12 ENCA O
13 ENCB O
14 DI O
15 DO I
16 CE I
17 CL I
18 BRI I
19 POWER O
20 MIC O
21 ME -
22 GND -
J901 (MIC jack)
1 MBL O
2 8C O
3 GND -
4 PTT I
5 ME -
6 MIC I
7 HOOK I
8 CM I
TM-281A
Function
AF GND
AF GND
AF out
AF out
8V DC supply
RXD/ PC serial data
PTT/ PC serial data
Volume
Microphone key
5V DC supply
Microphone key check
Encoder A
Encoder B
Data from LCD driver
Data for LCD driver
Chip enable for LCD driver
Clock for LCD driver
LCD brightness control
Power key
Microphone
GND
GND
Key detection
Switched 8V for MIC
GND
PTT/ PC serial data
MIC GND
MIC signal input
HOOK/ PC serial data
MIC data detection
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