Power Supply Circuit; Optional Board Terminal; Terminal Name And Function - Kenwood TK-380 Service Manual

8. Power Supply Circuit

Battery +B is supplied via a 3A fuse from the battery terminal
connected to the TX-RX unit. After passing through the power
switch, power supply (SB) is applied to the three AVRs. IC5
supplies 5V (5M) to the control circuit, and IC9 supplies 5V
(5C) to common circuits. IC6 supplies to the TX circuit, the RX
circuit and common circuits of needless save mode. During
transmission, 5TC becomes Low and Q3 is turned ON to supply
5V (5T) to the TX circuit. During reception, 5RC becomes Low
and Q2 is turned ON to supply 5V (5R) to the RX Circuit.
F1 +B
SB
ON/OFF
VOL
Display unit
Fig. 15 Power supply circuit
CIRCUIT DESCRIPTION
RF power amp (IC100)
5M
IC5
IC9 5C
Q3
IC6 5T
5TC
5R
Q2
5RC
5CNS

9. Optional Board Terminal

Terminals for mounting the option board are provided at
the bottom edge of the TX-RX unit. The table below shows the
correspondence between the board and terminals. R37, R69,
R250, R259, R260, R276, R280 may have to be removed
depending on the type of option board being used.
Name
SB Battery (7.5V)
GND Ground
TXD Serial data
RXD Serial data
SQ Busy: high
LOK Link acquired : low (TX mode)
DI/ANI Modulation (ANI) input
DEO Detect output
TXAI/MUTE Modulation output from board or mic mute: low
TXAO Modulation input to board
RXAI Received signal input to board
RXAO Received signal output from board
D1 Binary 1
D2 Binary 2
OPT Scramble, Emergency:low
PTTIN PTT switch signal input to board (TX:low)
5CNS Battery (5V)
DI9 9600 bps data output
RXEMAO Received signal output from board (after de-
emphasis)
RXEMAI Received signal input to board (after de-
emphasis)
PTTOUT PTT switch signal output from board (TX:low)
MONI Busy:low
LAMP Busy:low
AAC Audio Amp Control signal output from board
(Busy:high)
Audio Beep Beep signal output from board.
AUX TXD Serial data
AUX RXD Serial data/Option switch port
/EXT SW
Table 1 Terminal name and function
TK-380
Function
25