Dell Pentium Pro Restoration — Part 1b: Power supply testing

During testing, I’ll be powering the supply through an isolation transformer for safety, and will also use a variac to test the power supply with lower and higher AC voltages. For measurement, I’ll be using a Rigol DS1102E oscilloscope as well as a BK Precision 2709B digital multimeter. This is an entry-level scope with limited […]

Dell Pentium Pro Restoration — Part 1a: The power supply

Before powering up the system or doing anything else, I want to see what condition the power supply is in. The importance of the power supply is obvious: without it functioning properly, the condition of anything else in the system is a moot point. Not only do we need the appropriate voltages, we need them […]

AKAI Midimix

I thought I might start posting repairs that I do for my small business called The Resistance.