Kenwood TK-885 Service Manual page 8

TK-885
2. Accessory Terminal (TX-RX Unit)
2-1. External Connector Accessory Terminal Method
Connector Pin Pin I/O
No. No. name
CN1 1 DEO O Detect signal output. (Output level :
2 AHK
3 IGN
4 DI
5 ME
AM
6 MI
TXS O No function.
7 PTT
8 SQ O No function.
CN2 1 AM
LOK O No function.
2 MM
3 DTC
TXS O No function.
FSW
LOK O No function.
CN3 1 HOR O Horn alert signal output. Signal
2 E
3 SB O Power output after power switch
CN4 1 LOK O No function.
2 RXD
3 TXD O Serial data output 1.
CN5 1 PA O Relay for PA function in KAP-1
2 SPO O Audio signal input from KAP-1.
3 SPI
CN6 1 SP O Output for internal/external speaker.
2 E
8
INSTALLATION
Function
250mVrms; standard modulation)
I No function.
I Ignition sense input.
I External modulation signal input.
– MIC earth.
I Audio mute signal input.
I Internal MIC input.
I No function.
I Audio mute signal input.
I MIC mute input.
I No function.
I Foot switch signal input.
Foot sw on : L, Foot sw off : H
output for horn relay drive (open
collector). L level during horn drive :
Max. sink current 100mA.
L level when AUX A is on.
– Earth.
(DC 13.6V± 15%, 0.75A max.).
I Serial data input 1.
control signal. PA on : H, PA off : L
I Audio signal output to KAP-1.
– Earth.
3. Optional Board Terminal
Terminal is for mounting the option board are provided at
the control and TX-RX unit. The table below shows the cor-
respondence between the board and terminals. Disconnect
R529 and R571 in control unit when the scrambler board is
attached.
The table below shown the differences between the
schematic terminals and the PC board terminals.
Schematic diagram
Name I/O Function
SB O Switched B+ (13.6V, 0.75A)
5C O 5C
GND – Earth
DEO O Detect signal output (Output
level : 250mVrms; standard
modulation)
RXAI I RX audio input
RXAO O RX audio output
TXAI I TX audio input
TXAO O TX audio output
LOK O No function
OPT O Option board select.
CODE1 O Option code 1 (for voice
scrambler code 1)
CODE2 O Option code 1 (for voice
scrambler code 2)
CODE3 O Option code 1 (for voice
scrambler code 3)
CODE4 O Option code 1 (for voice
scrambler code 4)
SQ O No function
TXD1 O Serial data output 1
RXD1 I Serial data input 1
TXD2 O Serial data output 2
RXD2 I Serial data input 2
RSSI O Receive signal strength indication RSSI
PTT I PTT
MPTT I MIC PTT
FSW I Foot switch input
PC board view
Name Unit
SB TX-RX
5C TX-RX
E TX-RX
DEO TX-RX
RXAI Control
RXAO Control
TXAI Control
TXAO Control
LOK TX-RX
OP TX-RX
C1 TX-RX
C2 TX-RX
C3 TX-RX
C4 TX-RX
SQ TX-RX
TD1 TX-RX
RD1 TX-RX
TD2 TX-RX
RD2 TX-RX
TX-RX
PTT Control
MPTT Control
FW TX-RX