09-05-2022, 12:34 PM
Hi All,
Just got a Premium 128k which the seller said had been working until recently when it made a pop and released the magic smoke.
When I plugged it in I got a "fizz" and some smoke from c80 and the top of it even started glowing! I replaced with a cap borrowed from another 'Bee but I'm getting nothing. Core board works when tested on a similar machine (although I don't have a boot disk). Any idea what else might go at the same time as c80 before I start checking everything (eg. should I replace c79 as well)? I saw on another post that Someone recommends replacing the tantalums with low induction electrolytics
Also, where can I get the circuit diagram for the Premium base board?
PS. Just read a post where it was pointed out that the 2xFDD base unit uses a switching power supply (the MB base board has a smaller filter cap - as mine does) and that using a standard Microbee PSU brick can give problems - such as blowing the tantalums.
Cheers.
Just got a Premium 128k which the seller said had been working until recently when it made a pop and released the magic smoke.
When I plugged it in I got a "fizz" and some smoke from c80 and the top of it even started glowing! I replaced with a cap borrowed from another 'Bee but I'm getting nothing. Core board works when tested on a similar machine (although I don't have a boot disk). Any idea what else might go at the same time as c80 before I start checking everything (eg. should I replace c79 as well)? I saw on another post that Someone recommends replacing the tantalums with low induction electrolytics
Also, where can I get the circuit diagram for the Premium base board?
PS. Just read a post where it was pointed out that the 2xFDD base unit uses a switching power supply (the MB base board has a smaller filter cap - as mine does) and that using a standard Microbee PSU brick can give problems - such as blowing the tantalums.
Cheers.