Kenwood TK-780 Service Manual Supplement page 22

TK-780/H
Connector Pin Pin I/O
No. No. name
8 SQ O Squelch signal output. Signal logic
CN2 1 AM
LOK O Access logic signal output. Active
2 MM
3 DTC
TXS O Signal indicating whether the trans-
FSW
LOK O Access logic signal output.
CN3 1 HOR O Horn alert signal output. Signal
2 E
3 SB O Power output after power switch
CN4 1 LOK O Access logic signal output.
2 RXD1
3 TXD1 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
22
INSTALLATION
Function
type can select "Carrier operate
relay" or "Tone operate relay".
Active logic level or type can select
in the KPG-49D.
I Audio mute signal input.
level or type can be selectable in the
KPG-49D.
I MIC mute input.
I Data control channel signal input.
Data channel : L, Normal channel : H
ceiver is transmitting or not.
TX : H, Another : L
I Foot switch signal input.
Foot sw on : L, Foot sw off : H
Active level or type can be
selectable in the KPG-49D.
output for horn relay drive (open
collector). L level during horn drive :
Max. sink current 100mA.
– Earth.
(DC 13.6V 15%, 0.75A max.).
Active level or type can be
selectable in the KPG-49D.
I Serial data input 1.
"COM1" port must be select "REM"
/ "DATA" / "GPS" / "DATA+GPS"
function in the KPG-49D.
"COM1" port must be select "REM"
/ "DATA" / "GPS" / "DATA+GPS"
function in the KPG-49D.
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 TX-RX unit (A/2) and TX-RX unit (B/2). The table below
shows the correspondence between the board and termi-
nals. Disconnect R529 and R571 in TX-RX unit (B/2) 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 – Switched B+, DC 13.6V
output. Maximum 0.75A
5C – 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 Access logic signal output.
Active level or type can be
selectable in the KPG-49D.
OPT O Option board select. Please
(EMG) select option board type in the
KPG-49D.
OP1 O Option code 1 (for voice
scrambler code 1)
OP2 O Option code 1 (for voice
scrambler code 2)
OP3 O Option code 1 (for voice
scrambler code 3)
OP4 O Option code 1 (for voice
scrambler code 4)
SQ O Squelch signal output. Signal
logic type can select "Carrier
operate relay" or "Tone operate
relay". Active logic level or type
can select in the KPG-49D.
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
ST I Side-tone input
PC board view
Name Unit
SB TX-RX (A/2)
5C TX-RX (A/2)
E TX-RX (A/2)
DEO TX-RX (A/2)
RXAI TX-RX (B/2)
RXAO TX-RX (B/2)
TXAI TX-RX (B/2)
TXAO TX-RX (B/2)
LOK TX-RX (A/2)
OP TX-RX (A/2)
C1 TX-RX (A/2)
C2 TX-RX (A/2)
C3 TX-RX (A/2)
C4 TX-RX (A/2)
SQ TX-RX (A/2)
TD1 TX-RX (A/2)
RD1 TX-RX (A/2)
TD2 TX-RX (A/2)
RD2 TX-RX (A/2)
TX-RX (A/2)
PTT TX-RX (B/2)
MPTT TX-RX (B/2)
FW TX-RX (A/2)
ST TX-RX (A/2)