INSTALLATION
2-8
Revised February 1997
Part No. 001-9750-005
c. Install the microphone hanger in a convenient loca-
tion using the screws for sheet metal or plastic. The
hanger must be connected to chassis ground for
proper operation of functions such as monitoring
and scan. If required, ground the hanger using the
included ground wire.
d. Route the control cable from the transceiver to the
control unit and plug it into both.
e. To route speaker audio to the control unit, insert the
two wires on the transceiver end of the control cable
into the slots for pins 1 and 2 of the accessory con-
nector (see Figures 2-2 and 2-3). The order of these
wires is not important.
NOTE: If the control unit is being used with a front-
mount transceiver to provide dual controls, a jumper
must also be connected between pins 1 and 3 of the
accessory connector to route audio to the transceiver
speaker.
2.5.4 USING AN EXTERNAL SPEAKER WITH A
REMOTE CONTROL UNIT
A 12-watt external speaker (such as the one listed
in Table 1-1) can be used in place of the 5-watt
speaker in the control unit. Instead of connecting the
two control cable wires to the accessory connector as
described in step e above, connect the external speaker
to pins 1 and 2 of that connector instead. It is not
recommended that an external speaker be used if an
internal speaker is also being used such as in dual
control applications.
2.5.5 MICROPHONE HANGER SENSE
When the blank front panel is installed on a trans-
ceiver, the microphone hanger line goes to an off-hook
(high) state. This is sensed by the microprocessor
which may then initiate such actions as halting scan-
ning or enabling the conventional monitor mode.
To prevent this from happening, the transceiver
should be programmed as a remote-mount type by
selecting “Yes” for the “Remote Trunk Mount” param-
eter on the Main Radio Parameters screen (see Section
4.3.2). The microprocessor then assumes that the
hanger line is always in an on-hook state (low). This is
the only special transceiver programming that is
required to use the remote control unit.
In dual control applications, the hanger line is
controlled by a microphone, so this parameter should
be programmed “No”. The hanger line is not used in
remote-mount configurations because the micropro-
cessor detects the control unit hanger status from data
on the serial data bus.
2.6 INSTALLING OPTION SWITCH KEY CAPS
A key cap kit included with each transceiver (see
Table 1-1). This kit includes key caps labeled for each
option that can be programmed and also blank keys for
unused positions.
A key cap removal tool is included with each
transceiver in the cable and hardware kit. This tool is
simply a narrow strip of metal. To remove a key with
this tool, hold it perpendicular to the front panel and
then slide it under the lower side of the key. This
releases the key so that it can be pulled out. To install a
new key cap, simply press it into the opening.
Summary of Contents for Summit DM 975x
Page 105: ...MULTI NET SYSTEM OVERVIEW 5 10 Revised February 1997 Part No 001 9750 005 ...
Page 108: ...CIRCUIT DESCRIPTION 6 3 August 1993 Part No 001 9750 001 Figure 6 1 Transceiver Block Diagram ...
Page 123: ...CIRCUIT DESCRIPTION 6 18 August 1993 Part No 001 9750 001 ...
Page 131: ...SERVICING 7 8 Revised January 1995 Part No 001 9750 003 ...
Page 156: ...9 19 Revised December 2000 Part No 001 9750 007 TRANSCEIVER EXPLODED VIEW PART 1 ...
Page 168: ...Revised January 1995 Part No 001 9750 003 10 11 INTERCONNECT SCHEMATIC ...
Page 169: ...Revised January 1995 Part No 001 9750 003 10 12 DISPLAY BOARD SCHEMATIC ...
Page 171: ...Revised January 1995 Part No 001 9750 003 10 14 RF BOARD SCHEMATIC REVISED 800 MHZ ...
Page 172: ...Revised January 1995 Part No 001 9750 003 10 15 RF BOARD BOARD LAYOUT ALL 800 900 MHZ ...
Page 173: ...Revised January 1995 Part No 001 9750 003 10 16 RF BOARD BOARD SCHEMATIC 900 MHZ ...
Page 174: ...Revised January 1995 Part No 001 9750 003 10 17 RF BOARD BOARD SCHEMATIC UNREVISED 800 MHZ ...
Page 178: ...Revised January 1995 Part No 001 9750 003 10 21 PA BOARD SCHEMATIC 900 MHZ 30W ...
Page 179: ...Revised January 1995 Part No 001 9750 003 10 22 PA BOARD SCHEMATIC 900 MHZ 15W ...
Page 181: ...Revised January 1995 Part No 001 9750 003 10 24 PA BOARD SCHEMATIC UNREVISED 800 MHZ 35W ...
Page 182: ...Revised January 1995 Part No 001 9750 003 10 25 PA BOARD SCHEMATIC UNREVISED 800 MHZ 15W ...
Page 183: ...Revised January 1995 Part No 001 9750 003 10 26 AUDIO LOGIC BOARD SCHEMATIC PART 1 OF 2 ...
Page 184: ...Revised January 1995 Part No 001 9750 003 10 27 AUDIO LOGIC BOARD SCHEMATIC PART 2 OF 2 ...
Page 185: ...Revised January 1995 Part No 001 9750 003 10 28 AUDIO LOGIC BOARD LAYOUT TOP VIEW ...
Page 186: ...Revised January 1995 Part No 001 9750 003 10 29 AUDIO LOGIC BOARD LAYOUT BOTTOM VIEW ...
Page 188: ...Revised January 1995 Part No 001 9750 003 10 31 REMOTE TRANSCEIVER INTERCONNECT SCHEMATIC ...
Page 189: ...Revised January 1995 Part No 001 9750 003 10 32 REMOTE CONTROL UNIT INTERFACE BOARD SCHEMATIC ...
Page 216: ...Part Number 001 9750 007 12 00 hph Printed in U S A ...
