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So. Here are the components I tried to list previously: QP2 - transistor - original: CET 48C0 CEF02N6 - replaced with: IRFBC40 CP23 - blue ceramic capacitor - original: HR R 271J 2KV - replaced with: B 271K 3KV (270pF 3000V)   RP40 - resistor - original: Red Red Brown Gold (220 Ohms 5%) -...

Since this is the only board I have — and because it has a lot of captive wiring coming out directly from the board, I came up with this dirty cheap method of securing the wiring raising the board so to work on its back. There are some holes scattered along the board through which you could...

Hello fri0701. Thank you for your suggestions :) I tried to verify the outputs at the external floppy drive port but I got no readings at all. Just for reference, I did the procedure as suggested in the book I mentioned before (chapter 8, page 162): Black probe on ground Red probe on: Pin...

Hello from Lisbon  ;)   Although this is my first post, I’ve been visiting this forum looking for clues on what might be wrong with a 1991 Macintosh Classic. I’ll try to clearly describe what happened so that owners with similar symptoms will be able to repair their Classics. I have no...