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Title: CPC6128 disk drive doesn't work with switcher
Post by: naujoks on 21:19, 20 July 22

I'm in the process of putting together a Jan Beta style universal PSU.
For that purpose I have two Meanwell switchers, one +5 and one +12; using the correct polarity.
The computer works just fine (no picture distortion either), but the disk drive isn't doing anything: disk missig error.
I measured 12v coming from that respective PSU.
Any idea why it's not working?

Title: Re: CPC6128 disk drive doesn't work with switcher
Post by: eto on 21:30, 20 July 22

I'm using that setup and it works for me.

Just to be 100% sure polarity is correct: 12V has + on the outside.

Did you check the belt of the drive?

Title: Re: CPC6128 disk drive doesn't work with switcher
Post by: naujoks on 21:45, 20 July 22

Yes, polarity is correct.
I just tried another PSU for the +12 that I had lying around, same result though.
It works fine when I use the Amstrad MP2 for power.

Title: Re: CPC6128 disk drive doesn't work with switcher
Post by: Bryce on 11:36, 21 July 22

Using two switched mode supplies can cause problems. Check that both GND's are at the same potential. If the are offset, the voltages may be wrong (relative to each other).

Bryce.

Title: Re: CPC6128 disk drive doesn't work with switcher
Post by: naujoks on 14:47, 21 July 22

Turns out the (new!) cable between the PSU and the CPC was faulty...
Ah well, at least we have an explanation. All working now.
Thanks for the help!

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General Category => Technical support - Hardware related => Topic started by: naujoks on 21:19, 20 July 22