The power supply is an area of any piece of equipment with which an engineer should be particularly familiar, because it is generally one of the most unreliable sections of all. There are many reasons for this: primarily high voltages and currents giving rise to lots of heat, which increases the rate of failure of components and increases the likelihood of dry joints. Breaks in printed circuits occur because of the heavy components used and the high temperatures and currents present. Failure elsewhere in a unit can also result in damage to the power supply, which feeds all stages of a unit. As well as the obvious faults causing ‘no-go’ through missing rails, the power supply section may give rise to niggling faults apparently ...

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