Reparing an old DEC Rainbow PC100

[justanothercanuck]

Before any more application of power, I suggest that you look inside the power supply for any paper-dielectric EMI filtering caps that look like this:

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These capacitors have a nasty habit of quickly looking like this after application of power, with an exhilarating release of smoke and plasma:

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yeah, they don't sound all that great after 30 years.