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TO RECEIVE A MESSAGE
1. Turn the radio on by turning the OFF-VOLUME control
halfway to the right.
2. Turn the SQUELCH control clock-wise (to the right) as
far as possible. A noise will be heard from the speaker.
3. Adjust the VOLUME control for the desired listening
level.
4. Turn the SQUELCH control counterclockwise to the left
until the noise just cuts off.
5. In multi-frequency radios, select the desired channel.
The radio is now operational.
TO TRANSMIT A MESSAGE
1. Turn the radio on and select the proper channel.
2. If a lengthy message (or several messages) are to be
sent, the vehicle engine should be running to maintain
the battery charge.
3. Pick up the microphone and listen briefly to the speaker
to make sure that no one else is using the channel.
4. Press the push-to-Talk (PTT) switch on the microphone
and send the message. The red transmit light on the con-
trol unit will glow each time the PTT switch is pressed.
MAINTENANCE
The use of microcomputer technology allows self diag-
nostic maintenance routines to be incorporated in the micro-
computer software. These routines are easy to run and
provide a quick analysis of microcomputer and frequency
synthesizer operation.
The service section of this manual contains the diagnos-
tic routines, and other maintenance information to service
this radio. The service section includes:
• System interconnections
• Mechanical layout
• Disassembly procedures
• Replacement of IC’s chip capacitors and resistors
• Microcomputer self diagnostics
• Alignment procedures for the transmitter and receiver
• Troubleshooting flowcharts and waveforms
Pinted in U.S.A.
LBI-31564
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