Power SuppliesWARNINGDanger of severe electric shock.Do not operate the power supply without observing all the proper safety precautions. Do not operate with the covers removed. If in doubt consult a qualified electrical engineer The Sirius 1 comes fitted with one of two types of power supply made by different manufactures. As can be appreicated the level of failure increases as the components age. Generally try to avoid long periods of power down. Power up the computer at regular intervals but avoid rapid switching on and off. COMPOWER This is the most common power supply fitted. Should this power supply fail a large number of components will have to be replaced. Due to the low impedence of the primary circuit all components should be removed before testing.The usual components to fail are:
Transisors
Once the supply is working adjust R116 to give 5 volt output on full load. ASTEC This power supply is slightly better than the Compower supply in respect of its higher current capability and cooler running. This power supply is fully self regulated i.e. no presets to adjust the output so voltages may vary from that specified i.e. 5 volts and 12 volts. Capacitors should be checked for leakage. Components likly to cause failure:
Transistors
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