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Posted

This is very strange.

Can you tell me exactly what components are on the base PCB and where you are measuring this 8-12V?

And why is it a range of 8-12V and not an exact value? Why is it changing?

I can only think the C64 PSU is broken somehow and not outputting regulated 5V, since for PSU Option A, the 5V and ground tracks are directly connected to pins of the C64 PSU plug.

Posted

Hi Wilba,

I am at this point: "Completing the Base PCB in Stages"

No IC is mounted and only parts for PSU Option A is soldered.

C64 Power Supply:

- 10,8V AC

- 6,3V DC (2,4V AC)

Base PCB measured points:

J09, J3, UX_COREX Pin 11-12 and 32-31.

I think its the AC ratio of the +5V line of the power supply causes this problem.

The volatge is stable at the moment at 8,4V but only the first measurement I have 12,3V.

Best regards

Jack

Posted

Is that 6,3V DC coming out of the C64 PSU plug, between middle pin (ground) and the one next to it, when it's not connected to the base PCB?

That is supposed to be regulated +5V. It might range a little bit around that value... maybe as much as 4,9V-5,1V but definitely not 6,3V.

If you are not getting regulated +5V out of the C64 PSU then the problem is with the C64 PSU and not the PCB at all.

  • 2 months later...
Posted

Maybe a question answered before, but are the errors fixed in the PCB's I order last week from SmashTV?

Yes. If it's from SmashTV, it's 100% error free.

  • 3 months later...
Posted

The other J15 headers don't have backlight circuits, since they are only there for completeness and maybe for debugging with an LCD that doesn't need backlight.

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