Power Management Unit Disassembly And Reassembly; Safety Precautions; Personal Safety - Tait TB8100 Service Manual

14 Power Management Unit Disassembly
and Reassembly
14.1

Safety Precautions

14.1.1

Personal Safety

TB8100 Service Manual
© Tait Electronics Limited September 2006
This chapter provides information on how to remove and replace the covers
and front and rear panels. It also describes how to disconnect and reconnect
the AC and DC modules.
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.
Caution
The magnetics and power devices attached to the
heatsink in the PMU get hot when they are operat-
ing. Take care when working on a PMU that has
been in recent use.
Caution
The PMU can weigh up to 6.4kg (14.1lb). Take care
when handling the PMU to avoid personal injury.

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