Kenwood TK-885 Service Manual page 15

TK-885
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 corre-
spondence 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 sche-
matic terminals and the PC board terminals.
Schematic diagram
Name I/O
SB O Switched B+ (13.6V, 0.75A)
5C O 5C
GND - Earth
DEO O Detect signal 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 2 (for voice
scrambler code 2)
CODE3 O Option code 3 (for voice
scrambler code 3)
CODE4 O Option code 4 (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 Serial data output 2
MPTT I MIC PTT
FSW I Foot switch input
SB
TX-RX unit (A/2)
Foil side view
14
INSTALLATION /
PC board view
Function Name
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
LOK
E
DEO RD2 5C C4 C3
TD2 RD1 SQ OP
TD1 FW C2 C1
RSSI
Unit
Control unit (B/2)
Foil side view
MPTT
PTT
Fig. 4 /
TXAI
TXAO
RXAI
RXAO