Tait TB8100, Service Manual

Page: 15 / 306

TB8100 Service Manual Safety and Servicing Information 15
© Tait Electronics Limited September 2006
1 Safety and Servicing Information
This chapter contains general information on safety and servicing
procedures for the TB8100 base station modules:
■
reciter
■
power amplifier (PA)
■
power management unit (PMU)
■
control panel.
You will find specific safety and servicing information about individual
modules in the appropriate chapters.
1.1 Personal Safety
1.1.1 Lethal Voltages
Warning!!
The PMU contains voltages that may be lethal.
Refer to the ratings label on the rear of the
module.
Disconnect the mains IEC connector and wait for five minutes for
the internal voltages to self-discharge before dismantling. The AC
power on/off switch does not isolate the PMU from the mains. It
breaks only the phase circuit, not the neutral. The DC power on/
off switch disables only the control circuitry. The DC input is still
connected to the power circuitry.
Warning!!
These switches do not totally isolate the internal
circuitry of the PMU from the AC or DC power
supplies. You must disconnect the AC and DC
supplies from the PMU before dismantling or
carrying out any maintenance.
The PMU should be serviced only by qualified technicians. All servicing
should be carried out only when the PMU is powered through a mains
isolating transformer of sufficient rating. We
strongly recommend that
the mains power to the whole of the repair and test area is supplied via an
earth leakage circuit breaker.