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4-1
4. MAINTENANCE
WARNING
Do not open the equipment.
Improper handling can result in electrical
shock. Only qualified personnel should
work inside the equipment.
Do not disassemble or modify the
equipment.
Fire, electrical shock or serious injury can
result.
4.1 Weekly Checks
Check the radiotelephone at appropriate intervals as required by Administration.
Aural testing
1. Press the [ALM] key to generate the alarm. Confirm that the two-tone alarm is released for
more than 30 seconds. You will hear the audio from the loudspeaker. This process helps to
verify that the radiotelephone alarm generator is in the working condition without transmit-
ting an actual radio signal.
2. To terminate test, press the [ALM] key again or [ENT] (STOP) key.
Testing the transmitter with a dummy antenna
This requires the optional dummy load (in the antenna coupler).
1. While pressing and holding down the [ALM] key, press the [INT/0] key. The dummy an-
tenna in the antenna coupler is connected to the FS-1503 instead of the antenna. “DUMMY”
appears and the test signal at test frequency (for example, 2191 kHz), modulated by two
tones (1300 Hz and 2200 Hz), is generated across the dummy load for 45 seconds.
2. To stop the emission, press the [ALM] key. The dummy load is disconnected and the trans-
ceiver restores the previous frequency setting.
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