11-03-2023, 08:00 PM
I had a quick look at a twin drive unit for a 56k MicroBee today, it was given to me back in Dec last year. Turned it on, nothing. Check voltages, nothing, check fuse, blown. Replaced fuse (small 1A) and it fired up with A: spinning and LED on. Plugged it into my 56k bee and A: drive boots a disk, fantastic. A couple min later smoke appeared from the power supply, gee whats new ! Turn it off and removed the power supply PCB. It was those 3 large 4700 uF caps ! no RIFA's in this transformer based power supply. Replaced the caps with new ones I bought from Jacar way back, they are a bit taller but still fit ok. So now all good, except B: doesn't work. Cleaned heads, lubed the rails, etc and still no go. So replaced the drive and now all good and working.
These were the caps, 2 turned almost brown and one had its base expanding.
These were the caps, 2 turned almost brown and one had its base expanding.
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ChickenMan
ChickenMan