Kenwood TK-190 Service Manual page 19

10-1. Option port 1 (For ANI board etc.)
Port name
Abbreviation (PCB) Name
DATI Data In
DATO Data Out
TCONT T Control
STONE Side Tone
AUDIH Audio Inhibit
E Ground
MUTE Mute
SCALL Selective Call
AUX Aux
PTT PTT
MAND Man Down
EMERG Emergency
BUSY Channel Busy
KEY (Transmission)
Key
A+ Board power
supply
10-2. Option port 2 (For voice scrambler etc.)
Abbreviation (PCB) Name
CODE1 Scramble Code 1
CODE2 Scramble Code 2
CODE3 Scramble Code 3
CODE4 Scramble Code 4
TXOUT TX Out
RXOUT RX Out
NC No Connection
E Ground
PTTIO
CLR/C (AUX) Clear/Code
RXAEN
RXIN RX In
TXIN TX In
+V Board power supply
CIRCUIT DESCRIPTION
Description
Board data input
Transceiver (Receiver demodulation circuit)
→ ANI board
Board data output
ANI board → Transceiver (Transmitter modulation
circuit)
Audio amplifier power control → Control unit (X53)
counter → TX-RX unit (X57) microcomputer
Beep during PTT ID
Microphone muting during PTT ID
Ground
Mutes transceiver receive tone
LED drive port for selective call
Emergency Channel request → Control unit
(X53) counter → TX-RX unit (X57) microcomputer
Microcomputer PTT logic → ANI board
Man Down mercury switch input port
Transceiver → ANI board
Microcomputer Emergency Channel logic
→ ANI board
Microcomputer Busy logic → ANI board
Transmission start control GE-Star → Control unit
(X53) counter → TX-RX unit (X57) microcomputer
Switched B
Description
First of four bits of scramble code
Second of four biits of scramble code
Third of four bits of scramble code
Fourth of four bits of scramble code
Board → Transceiver (Transmitter modulation
circuit)
Board → Transceiver (Audio amp)
No connection
Ground
Scramble modulation/demodulation control
Specifies whether to scramble
Enables the power save mode of the board
Transceiver (Receiver detection output)
→ Board
Transceiver (Microphone circuit) → Board
Switched B
Connection
Connected to the circuit Reference
1kHz STD Dev →
250~350mVrms
Connected to the circuit Reference
1kHz/150mVrms →
2.5~3.5kHz/wide
1.25~1.75kHz/narrow
Microcomputer input L : Audio amp on
H : Audio amp off
Connected to the circuit
Connected to the circuit
Ground
Connected to the circuit
Unused, no connection
Microcomputer input L : EMG CH request
H : No EMG CH request
Microcomputer output L : RX, H : TX
Microphone connector L : Switch on
H : Switch off
Microcomputer output L : Emergency operation
request
H : No emergency
operatiion request
Microcomputer output L : Busy
H : Not busy
Microcomputer input L : Transmission request
H : No transmission request
Power supply
Check mode operation
Microcomputer output Board code selection
(Logic by binary code)
Connected to the circuit Reference
1kHz/15mVrms →
2.5~3.5kHz/wide
1.25~1.75kHz/narrow
Connected to the circuit
No connection
Ground
Microcomputer output L : TX, H : RX
Microcomputer output L : Scramble
H : Normal
Microcomputer output L : Power save mode
H : Normal
Connected to the circuit Reference
1kHz STD Dev →
250~350mVrms
Connected to the circuit
Power supply
TK-190
Note
Note
19