THEORY OF OPERATION (CONTROL HEADS)
MTM700
Mobile Radio / Detailed Service Manual
4.3 - 7
radio via the 12-pin flex (J1001). The SBEP interface is always available on the Telco connector.
The Expansion PTT signal on the Telco connector is routed though the Expansion Board via Q1083.
This line signals the radio that PTT is coming from the Expansion Head and the audio paths are
routed through the Expansion Head.
The JTAG port is provided on the back of the Expansion board. The pin layout of the connector is
setup in a way that the JTAG connector used for software debugging can be directly connected to
this port. A 14-pin m/m 90° adapter is needed to connect to the test equipment.
To select a specific configuration, pin 23 (SB9600_SW) on the 25 pin D-type connector can be used.
Also the ACC3 pin on the 12-pin flex and pin 19 on the JTAG connector influence which interface is
active in the Expansion Head at a specific time.
Default if nothing is connected to the radio is that the 8-wire RS232 interface and 4-wire RS232
interface are active.
A high voltage (12V) on pin 23 enables the 8-wire RS232 interface on the 9-pin D-type connector. At
the same time the SB9600 interface on the 25-pin connector is enabled. A low voltage (0V = default)
on pin 23 enables the 8 wire RS232 interface on the 9-pin connector and the 4 wire RS232 interface
on the 25-pin connector.
If a device is connected to the accessory connector of the radio, the 8-wire RS232 interface in the
Expansion Head is disabled. Also, if the JTAG port is used, a 3-Volt level is applied to pin 19 of the
JTAG, the 8-wire RS232 interface is disabled.
Remote Mount Head
General
The remote mount head and the radio are connected via 10-pin TELCO connectors. A 12-pin flex
connects the radio to one remote mount PCB and another 12-pin flex connects the other remote
mount PCB to the control head.
Description
The remote mount board basically routs the signals necessary to drive a control head from the radio
to the remote mount cable and to the control head. The signals (on/off control, supply voltage,
microphone, BUS+, speaker) are directly routed from the flex connector J0911 to the TELCO con-
nector J0921. VR921 – VR924 protect the boards against electrostatic discharge
Содержание MTM700
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