Kenwood TK-780 Service Manual page 21

Connector Pin Pin I/O
No. No. name
2 RXD I Serial data input 1. "Com1" port
must be select "DATA"/"GPS"
function in the KPG-60D.
3 TXD O Serial data output 1. "Com1" port
must be select "DATA"/"GPS"
function in the KPG-60D.
CN5 1 PA O Relay for PA function in KAP-1
control signal. PA on : H, PA off : L
2 SPO O Audio signal input from KAP-1.
3 SPI I Audio signal output to KAP-1.
CN6 1 SP O Output for internal/external speaker.
2 E – 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); Control section.
The table below shows the correspondence 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+ (13.2V, 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 TX logic signal output.
Active type can be
selectable in the KPG-60D.
OPT O Option board select. Please
(EMG) select option board type in the
KPG-60D.
CODE1 O Option code 1 (for voice
scrambler code 1)
CODE2 O Option code 1 (for voice
scrambler code 2)
INSTALLATION
Function
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)
Schematic diagram
Name I/O Function
CODE3 O Option code 1 (for voice
scrambler code 3)
CODE4 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-60D.
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
SB
TX-RX unit (A/2)
Foil side view
TX-RX unit (B/2) : Control section
Foil side view
MPTT
PTT
TK-780
PC board view
Name Unit
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)
LOK
E
DEO RD2 5C C4 C3
TD2 RD1
SQ OP
TD1 FW C2 C1
RSSI
TXAI
TXAO
RXAI
RXAO
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