TB8100 Service Manual Safety and Servicing Information 15© Tait Electronics Limited September 20061 Safety and Servicing InformationThis chapter contains general information on safety and servicingprocedures 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 individualmodules in the appropriate chapters.1.1 Personal Safety1.1.1 Lethal VoltagesWarning!! The PMU contains voltages that may be lethal.Refer to the ratings label on the rear of themodule.Disconnect the mains IEC connector and wait for five minutes forthe internal voltages to self-discharge before dismantling. The ACpower on/off switch does not isolate the PMU from the mains. Itbreaks only the phase circuit, not the neutral. The DC power on/off switch disables only the control circuitry. The DC input is stillconnected to the power circuitry.Warning!! These switches do not totally isolate the internalcircuitry of the PMU from the AC or DC powersupplies. You must disconnect the AC and DCsupplies from the PMU before dismantling orcarrying out any maintenance.The PMU should be serviced only by qualified technicians. All servicingshould be carried out only when the PMU is powered through a mainsisolating transformer of sufficient rating. We strongly recommend thatthe mains power to the whole of the repair and test area is supplied via anearth leakage circuit breaker.
