On 4/11/2015 6:39 PM, Keith Matthews wrote:
>    Re: Re: C-64 with no 9v possible failures?
>    By: Clocky to Keith Matthews on Wed Nov 04 2015 17:39:04
>
> Hi Clocky
>
>   > On 4/11/2015 8:08 AM, Keith Matthews wrote:
>   > > Hi All,
>   > >
>   > > I have a breadbox style C-64 that has stopped working.
>   > > I connected my 1501 Power Monitor to the Power Supply and it
>   > > seems fine for both 5v and 9v (well it shows 10v)
>   > >
>   > > The Power Supply work fine with my C64C machine.
>   > >
>   > > I connect the 1501 Power Monitor to the User Port and I
>   > > only get the 5v indication
>   > >
>   > > There does not seem to be 9v at the user port.
>   > > I have pressed in all the chips and checked the internal fuse on the
C-64.
>   > >
>   > > Just wondering if any of you great CBM guru's might know of the top of
you
>   > > head
>   > > what component (I'm guessing a capacitor?) might be failing?
>   > >
>   > > Also there is no display when powered on. The C-64 Power LED comes on
as
>   > > Normal.
>   > >
>   > > Thx for any advice 8-)
>   > >
>   >
>   > Do you know the history of the C64 because the C64 that was sold by Aldi
>   > (but not only Aldi) is known to have the 9VAC missing at the user port.
>   >
> Oh Wow really,
>
> I just assumed they were all the same. It is a Breakbox (older) model so I
> would have expected it to be
> Pre Aldi. 8-)
>

No the Aldi models where breadboxes but they did have a white keyboard,
but that could have been swapped at some stage.

> I know the unit used to work, although I could only get B & W out of it.
> Prehaps it
> is an NTSC version?
>

Checking the guts will tell you. Check the part number on the VIC-II and
see here;

https://en.wikipedia.org/wiki/MOS_Technology_VIC-II#List_of_VIC-II_versions

Since you're in NZ I would suspect it to be the same as our PAL system
(in Australia) but I found a 1541 dumped in the bush once that kept
popping fuses and it wasn't until I realised it had a 110V sticker on
the back that it was an US model. I rewired the 5V and 12V lines to
accept an AT power supply and it worked perfectly.

What the hell it was doing laying in the bush I don't know.

> There is no screen now though, so something inside has died.
> I wonder where else on the main board I could safely check for 9V?
>
> Thanks.
>

If you are using the old brick style power supply I would recommend that
you stop using it as they are notorious for letting go and taking the
computer out with it unless you can confirm that it's OK by checking the
9VAC and 5V lines.

There is a fuse inside the C64 that you can check and if you look for
the revision motherboard printed on the PCB and post it here (or post
pics online of the board) then that will be helpful.

--- SoupGate-Win32 v1.05