11-04-15 22:39 Keith Matthews wrote to Clocky about Re: C-64 with no 9v possi
Howdy! Keith,

 KM> @MSGID: 
 KM> @REPLY: 
 KM>   Re: Re: C-64 with no 9v possible failures?
 KM>   By: Clocky to Keith Matthews on Wed Nov 04 2015 17:39:04

 KM> 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.
 >
 KM> Oh Wow really,

 KM> I just assumed they were all the same. It is a Breakbox (older)
 KM> model so I would have expected it to be
 KM> Pre Aldi. 8-)

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

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

 KM> Thanks.

Some time ago I saw a Link to Ray Carlsen's web pages for the C=64 in this
rea.

He has lots and lots of pages that may help You.

The Home page is:

Ray Carlsen's-RepairingCommodorePCs
http://personalpages.tds.net/~rcarlsen/cbm.html

This page has the Service Manual.
http://personalpages.tds.net/~rcarlsen/cbm/c64/C64_SERVICE_MANUAL.pdf

HTH

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