RELM BK RADIO SDMX920 Technical Manual page 6

MX920 Base Station & Repeater Technical Manual
SAFETY SUMMARY
Only the MX920's self contained power supply, if installed, contains dangerous mains
voltages within. Normal operation and use of the MX920 does not expose the operator or
service technician to high voltage parts. The power supply is isolated from and maybe
removed safely from the main chassis. For servicing, please return to your nearest
distributor. No fuses or user-serviceable parts are within the power supply module.
The following general safety precautions as would normally apply, should be observed
during all phases of operation, service and repair of this equipment.
AROUND THE EQUIPMENT
To minimise any possible shock hazard from an external power supply or lightning strike, the
chassis or equipment cabinet must be connected to an electrical ground. This is normally
achieved by the Earth grounding wire within the 3 wire mains cable. Provide adequate
ventilation around the rear of the equipment.
DO NOT OPERATE IN AN EXPLOSIVE ATMOSPHERE
Do not operate the equipment in the presence of flammable gases or fumes. Operation of
any electrical equipment in such an environment constitutes a definite safety hazard.
DO NOT ATTEMPT INTERNAL SERVICE WHILE TRANSMITTING
Thermal or RF burns may result from touching certain components within the power
amplifier module while transmitting or operating the transmitter.
DO NOT SUBSTITUTE PARTS OR MODIFY THE EQUIPMENT
Because of the danger of introducing additional hazards, do not install substitute or lower
voltage parts to the equipment. Return to your authorised distributor.
EXERCISE CAUTION AND CORRECT DISPOSAL OF RF POWER DEVICES Most
RF power transistors and some RF power hybrids contain Beryllium Oxide. Although they
are normally safe, if physically damaged toxic dust may be released. Consult your local
authority for correct disposal thereof. Such devices are not normally used in the MX920.
WARRANTY CONDITIONS & PRECAUTIONS
The following conditions are not covered by the warranty of the MX920. Please ensure that
the MX920 is not subject to;
1. Over voltage or Reverse Power Supply Voltage.
2. Operation in locations subject to abnormal environmental conditions such as extreme
temperatures or ingress of moisture or excessively dusty environments.
3. Operation of the MX920 Transmitter output into an open or short circuit or an incorrectly
terminated load. Although a level of VSWR protection is included, greater protection is
provided by the addition of a TX RF isolator.
4
© SPECTRA ENGINEERING 2003 Revision 1.1.4