Uniden SMH 4000, Service Manual

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protected from moisture, moving parts, pas- negative wire connected to pin 2 of the
sengers, and engine heat in the engine
speaker jumper plug. The external speaker
compartment.
may be mounted at any convenient loca­
tion in the vehicle. Plan the location of the
Microphone external speaker so that it does not
obstruct the driver's vision. Protect the ex-
Do not use a preamplified microphone with
this radio. The audio portion of this radio is
adequate; preamplification is not neces­
sary. Mount the microphone hang-up
bracket within reach of the microphone
cord. If the radio operates with CTCSS,
make sure that the microphone hang-up
bracket is electrically grounded. Connect
the microphone to the microphone jack at
the front of the radio.
Built-in or External Speaker
If an external speaker is not used, make
sure that a jumper wire connects pins 1
and 2 of the speaker jumper plug. Place
the speaker jumper plug in the accessory
socket at the rear of the radio.
10
7 4
ouu
11 8
5
000
12 9
6
3
0000
WA105
If an external speaker is used, make sure
that you have the speaker properly con­
nected to the speaker jumper plug. Make
sure that you have the speaker's positive
wire
connected to p in 1 of the speaker
jumper plug jumper and the speaker's
ternal speaker from moisture, moving
parts, and passengers. Place the speaker
jumper plug in the accessory socket at the
rear of the radio.
10
7
4 1
0000
11
8
5
000
12
9 6
000
WA105
Speaker (SPKR HI)
positive wire
Troubleshooting Installation
Problems
If any problem appears following installa­
tion, determine the cause of the problem
and correct it before operating the vehicle.
Some possible sources of problems are:
•
Power cable connected to points
other than battery.
•
Antenna location.
•
Poor shielding or connections on the
wiring or cables.
•
Transceiver wiring located too close
to the vehicle's electrical system.
December 1 992 SMH 4000
Page
7