azog | August 27, 2011
So after my last mishap of popping a coil, today a package from Mouser arrived. It had 10 2.2uH coils, and two other special items. First, when the original coil burned up, it was pretty destructive. It burned out the thru-hole plating, and burned out about an inch of the solder mask. Here is what [...]
azog | August 24, 2011
Still periodically working on the PET 4032. I removed everything that was crudded up, which was pretty much every part associated with the keyboard drive: one resistor network, one LS145, a 6520 and a male header. Whether or not these parts were bad is irrelevant, as they needed to be removed so I could clean [...]
azog | August 3, 2011
Spent a few hours cleaning off the PCB of the PET 4032. It looks a lot better now, most of the dust and grime is gone, and it’s a bit shiny now. Basically I just kept spraying isopropyl alcohol and used a small scrub brush and gently scrubbed it down. Even after cleaning, the keyboard [...]