QL MicroDrive electrolytic caps

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keyboardjunkie
ROM Dongle
Posts: 16
Joined: Mon Jun 03, 2019 11:25 am

Re: QL MicroDrive electrolytic caps

Postby keyboardjunkie » Thu Jun 10, 2021 2:49 pm

Hey Nasta,

Thanks for the heads up - I've ordered some 220nF and 470nF polyester film caps - for all the cost, I'll replace them and see where that takes me.

Hopefully it's not the head..

Cheers,

Mark.


keyboardjunkie
ROM Dongle
Posts: 16
Joined: Mon Jun 03, 2019 11:25 am

Re: QL MicroDrive electrolytic caps

Postby keyboardjunkie » Fri Jun 18, 2021 9:30 pm

And the caps arrived.. still nothing.. time to look some more..

I'll maybe break the scope out and check the waveforms on the new ULA to make sure that's working..

M


keyboardjunkie
ROM Dongle
Posts: 16
Joined: Mon Jun 03, 2019 11:25 am

Re: QL MicroDrive electrolytic caps

Postby keyboardjunkie » Sat Jun 26, 2021 11:38 pm

Hey everyone,

Thanks for all the pointers and help with my QL. Just a small update..

I replaced the caps on the MDV PCB (electrolytics) with the caps mentioned here.. and no dice. :-(

I then replaced 2 transistors on the motherboard and also the 1N4148 at D28.. and the MDV will read sometimes, sometimes not. It will not format or write..

I then took the plunge and removed the MDV PCB and transplanted that onto a parts MDV that I had with a broken ULA - and everything now works fine.. I guess the head was on the way out..

Thanks for all the help as usual!

Mark.



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