TM8100/TM8200 Service Manual TMAA01-01 Line-Interface Board 469
© Tait Electronics Limited November 2007
17 TMAA01-01 Line-Interface Board
Note These instructions refer to line-interface PCB issue 220-65202-02
or later. On earlier issue PCBs, SK1 pin 5 is ground.
The TMAA01-01 line-interface board provides both audio and
digital interfaces for a variety of systems. The interfaces available are:
■ an isolated 600Ω audio interface which is capable of both
simplex operation on a two-wire system, or duplex operation on
a four-wire system
■ a keying interface which allows for two-wire keying or single
line bi-directional keying
■ a variable delay timer
■ a logic sense control.
The line-interface board fits inside the radio in the options cavity
and is connected to the main PCB by the internal options loom.
The high-density 15-way D-range connector mounted on the
line-interface board fits through the external options connector
hole provided in the radio chassis.
17.1 Operation
One of the control head function keys can be programmed to toggle the
line-interface board on and off. The state of the function key LED when the
line-interface board is on depends on the way the radio is programmed (see
“Programming Information” on page 476).
17.2 Configuring the Line-Interface Board
Important This equipment contains devices which are susceptible to
damage from static charges. Refer to “ESD Precautions”
on page 112 for more information.
Important The radio does not meet the IP54 protec-
tion standard once a line-interface board
has been installed unless the external
options cover seal is installed.
external options
connector
internal options
connector
D-range
hood parts
D-range plug
line-interface board
line-interface
installation parts
internal options
loom
external options
cover seal
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