TEM A07EXXXX – 1 Unit Transmitters Page 9
3.4 Good practices
In maintaining the equipment covered in this manual, please keep in mind the following, standard good practices:
At regular intervals, the condition of the equipment and the correct functioning of protective and safety
devices shall be checked by a skilled person approved by the appropriate authority for this duty.
Functional checks shall be carried out on interlocking systems of doors, mechanical interlocks, isolating switches,
earthing switches, parallel resistances and protective devices against over-voltages and over-currents.
The above checks shall also be carried out after the protective and safety devices have operated under fault
conditions.
The safety devices shall not be altered or disconnected except for replacement, nor shall the safety circuit be
modified without specific approval of the appropriate authority in each case.
When connecting any instrument (wattmeter, spectrum analyzer, etc.) to a high frequency output, use
the appropriate attenuator or dummy load to protect the final amplifiers and the instrument input.
When inserting or removing printed circuit boards (PCBs), cable connectors, or fuses, always turn off
power to the affected portion of the equipment.
After power is removed, allow sufficient time for the power supplies to bleed down before reinserting PCBs.
When troubleshooting, remember that FETs and other metal-oxide semiconductor (MOS) devices may
appear defective because of leakage between traces or component leads on the printed circuit board.
Clean the printed circuit board and recheck the MOS device before assuming it is defective.
When replacing MOS devices, follow standard practices to avoid damage caused by static charges and
soldering.
When removing components from PCBs (particularly ICs), use care to avoid damaging PCB traces.
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