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<h1 class="entry-title" itemprop="headline">C64 power supply issue.  Modern style chassis.</h1>
		
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			<span class="posted-on"><time class="entry-date published" datetime="2024-12-25T21:52:55+00:00" itemprop="datePublished"><br>
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<p class="whitespace-pre-wrap break-words">C64 power supply issue  Might have blown again.  Or if you have your original supply, run a power saver device When dealing with Single board computers, I have found it best to splurge and get a good power supply.  The testing of Rev.  In North America, as far as I know, we only got the epoxy-ed &quot;brick&quot; power supply, which is not repairable.  I believe it was Ray Carlsen who originally Well, I'm very happy to bring you a good news! After some months of research, documenting and askingThere is a strong chance that I found a way to build an affordable C64 Power Supply! I will call it PSU64 First Of All: Problems with failing PSU(s) are well known to the community, with all the possible consequences.  Suspecting a power supply issue, I re-measured the outputs and was alarmed to find that they had increased to 6.  Another one would be the so-called “C64 Saver” that can be reset after an over-voltage incident without replacing a fuse.  Commodore never changed the basic crappy design of the C64 PSU except for the switching version sold with the 1764 REU.  Forces a constant current from the power supply and measures voltage levels and ripple.  Commodore Plus/4.  For the Commodore side of the connector, you can make your own cable with a 7-pin DIN, or cut the end off an old failed power supply.  But later, it wouldn't work with my Plus/4.  The thing is if it has fuses don't blow for no reason, could be a problem in the power supply itself or in the Honestly can't remember, I haven't owned one in years.  Results are displayed in real time on a digital OLED display. c64psu.  This General tips - Power supply (PSU) It's advisable to at least check your PSU voltages before putting it to actual use, as sometimes its failure can result in overvoltage and kill chips inside a This guide lists pictures of various Commodore 64 problem scenarios along with their descriptions and known causes.  My issue is that I have four C64s (2 x breadbin + 2 x C64C) which all display a kind of rolling interference when I power them using my newly acquired Keelog PSU.  Search the web generally regarding the c64 power supply issue.  The Pictorial C64 Fault Guide General tips - Power supply (PSU) Another common power problem is a wonky power switch that doesn't make proper contact.  yes get a 'proper' power supply. 4v and 14.  If you have a potted power C64 supply it's best not to Find a working C128 supply and swap a C64 cable onto it.  However, the minimum possible AC voltage on which the C64 will work correctly is about 8.  Top.  It is not a matter of IF the power supply will go bad, it is a matter of WHEN it will go bad.  The power supply yields 5VDC@3A and 9VAC@1.  At The main issue with the original C64 power supplies is the 5V line.  Or you can heat it (200 degrees) and wear a gas mask.  One way to do this would be a “crowbar” circuit that blows a fuse in case of an over-voltage.  a shorted internal 5V regulator, it will put excessive voltage into the computer and damages delicate chips such as the RAM very quickly.  If this makes a difference for the next boot, the switch is the most likely suspect. 73VDC and a bit high 9VAC values of 11.  It runs a thorough test, minimizing the risk of damage due to an ageing factory power supply.  Testing the connector pins and connecting the datassette unit to an external power supply I discovered that the pin c3 is supposedly not providing power to the motor.  Sinclair QL. 3&quot; x 1. 7A should be a better choice than the 1764 version RetroPower PSU is a new power supply for your retro computer.  I've basically ruled out scan converters, monitors, power strips, cables by moving the poor machines around to different displays while at the same time The problem with the C64 power supplies wasn’t limited to the early ones.  Repairing such a mess seemed Try another power supply as Commodore power supplies aren't (especially the black brick ones) known as being too reliable. 0A DC output with anti-ripple filter Transformer-generated 9V/1.  When it eventually fails (and it will!), from e.  So, I've just bought a C64 at a flea market and it was said to have a faulty datassette reader.  The biggest problem with using this PSU with the C64 is that Commodore changed the power Yes -- in certain markets like the UK, Commodore sold a repairable C64 power supply, at least for early models. g.  This power supply is repairable/revisable.  In your case, likely the voltage regulator has failed and I think you should consider yourself lucky that it didn't kill your C64, which is what these power supplies often do.  Because the C64 almost directly Regardless of the reasons as to why, almost 2 or 3 years after the release of the C64 the issues with the power supply were already well known.  Use it as a tool to assist in diagnosing C64 issues, to get a general idea of what might be wrong with your machine. 6v a relay is slammed shut and the line is cut.  Zen.  so I would say.  This page describes how to fix your power supply.  Reply The protector devices are not mere &quot;surge suppressors&quot;; they are adapters specifically designed for C64 power supplies to stop them from destroying a C64 once the power supply goes bad.  A C64 PSU failure can lead to expensive repairs, or even render the entire system useless. 6A and 5VDC@1. 6&quot;). In a nutshell, the voltage regulator on the 5 volt DC output tends to fail in such a way that it lets a voltage spike go straight to your C64 motherboard, frying the precious chips. 0&quot; x 2. 7A @ The problem however is that I do not have a power supply for it and I heard that the stock ones are pretty crap Upcoming Events: VCF SoCal - February 15 - 16 2025, Hotel Fera, Aneheim CA; Curious - if it's so easy to build a proper C64 power supply, then why on Lemon64 and other dedicated forums are there literally dozens of threads with people looking The previous test of the standard C64 PSU model had quite low 5VDC values of 4.  Power supply is very solid, the cabling is of good quality.  To really test a power supply you need to be able to put it under load and have an oscilloscope to test the The replacement power supply for c64 is an “old” idea, there are many good designs around, even ready-made good replacement PSUs can be easy purchased on eBay but coming back to your question, this would not Hi looking for a little help regarding an old commodore 64 and the power supply.  Make sure the voltage stays within safe margin from this, and test this with a datasette (which draws additional power from the 9V) The original C64 power supplies can deliver, depending on type, 1. 11A.  This is specifically why we have designed the C64 power supply tester.  Commodore 64 power supply unit (PSU) automated tester.  Collection of links and articles about the famous PET, VIC, C64, C128, TED, Amiga and PC Commodore machines.  ColecoVision. 1A AC output Over-voltage and over-current protection Fused on AC and DC side and fully isolated On/off AC switch on rear side Output voltages on universal DIN socket Output power cable included with DIN plugs High The third solution is to add the missing over-voltage protection between the power supply and the C64.  I want to make sure I do this right so I do not cause further destruction to the machine.  I generally go for quick blow on older equipment without any problems.  I have these two wall warts: The issue is when the C64 has warmed up a bit this happens to the screen: I'm worried it may be overvoltage and something else might be damaged as I already C64 power supply which hasn't been used in years.  The problem is if you have a heavy weight power supply its most likely a solid block of epoxy so you need a ice pick or chemicals to try to dissolve it.  Forces a constant current from the power supply and measures voltage Replacement power supply for Commodore 64 and VIC-20 Stabilized 5V/2.  Owners of a C64 using an original power supply should regularly (for example, once a year) check the 5V DC function of their power supplies, as they tend to produce higher voltages as they wear out.  Which is why I specifically mentioned C64 brick PSUs in my post.  This overvoltage is likely the cause of the damage to my C64.  Im not keen on those plans.  The main problem with the original C64 PSUs is that the whole thing was encased in a Contribute to Statik8bit/C64-power-supply-Pi-case development by creating an account on GitHub.  Checked both the internal fuse in the c64 and the transformer fuse.  C64 PSU Tester.  Read that a underpowered pi also provides weirdness in loading images.  It's a lot lighter and more compact than the original C64 power supplies.  Commodore 128. 6A then a plain vanilla C64 PSU with 1.  Save those precious C64 chips from The C64 PSU PRO model.  If they fail, they go to zero volts instead of the chip killing higher voltage.  ZX Spectrum.  Diagnosing a PSU The design is based on the one developed by famed C64-tinkerer Ray Carlsen, what it does is monitor the 5v line coming from your power supply and when it starts outputting voltages above 5.  I tend to use the CannaKit brand power supplies for my Pis and other devices. 1V AC.  What is the best way to test the power supply before I plug it in to the computer? I have a multi-meter.  our C64 / C128 power supplies resemble a modern power supply with a slick shape of 125 mm x 59 mm x 42 mm (5.  It must not be connected to 230V while 115V mains is selected.  0 is still preliminary.  What causes the 5v dc to grow is aging of the caps inside the power supply.  So a 128 power supply and the PSU that ships with the 1764 are unlikely to have this problem.  The PSU also has an over voltage protection circuit to ensure that the voltage levels will always be kept within safe margins.  The tester features an aluminum heat sink to The switching regulator in the 128 power supply is more complex and less likely to simply develop a dead short, like the C64 supply.  If it's fused to only 1.  eightbitswide Mikie Posts: 470 Joined: Sun Oct 02, 2016 3:01 pm Age: 53.  Stored away.  Hadn't worked for several years.  Here is what I have come up with.  Modern style chassis.  You name it.  The second one I bought worked with my C64, Plus/4 and C128.  RAM, or maybe your 6502 processor are dead when over The old Commodore 64 power supplies are prone to failure with over-voltage on the 5V line that will destroy your computer.  This PSU is designed for a low price at a decent comfort and for providing a PSU that can be switched between 230V and 115V mains.  This time I have also no problems - both C64 and 1541II run stable and PSU stayed cool, unlike my original power supply I use for 1541 disk drive (I have also modern replacement for this one, must test it next time - but I don’t even remember who sold me this one). 50VAC.  Voltage, Seems the first logical thing to do is replace the power supply. 0A) for powering a 1541-II and 1581 diskette drives.  The PSU My home-made C64 Power Supply is done! (story in comments) comments sorted by Best Top New Controversial Q&amp;A Add a Comment The main issue with the old power supplies is the 5V regulator.  Being under powered can cause all sorts of weird and hard to troubleshoot problems.  It will cut the 5v rail to the computer in case of an over voltage.  If you have an original OEM power supply, even one of the newer ones from 1988, you have a ticking time bomb on your hands.  The power supply has a sturdy custom-made chassis with an OLED digital display monitoring the output voltage and uptime.  If your C64 did get overvoltage, the For using this PSU, a suitable enclosure is required.  Or if you have your original supply, run a power saver device with it.  I've read elsewhere that the problem could be addressed to the u7 ic (or some transistor in Our power supply tester series for Commodore C64, C128, Amiga 500/500+/600/1200, Atari XL/XE, Atari 520ST/260ST, and ZX Spectrum +2A/+2B/+3 was created specifically to address this issue.  Unfortunately it was one of those power supplies where everything inside the case has been glued into one big block filling the entire case.  And you don't have to build you own power supply or have to make anything for it to work just plugin and play.  The C64 PSU PRO model also comes with an extra outlet socket (12VDC@0.  Amiga 500.  They tended to fail in a bad way, turning from a regulator into a wire and sending much a higher DC voltage into your precious MOS chips. 5A, which is quite questionable.  I have my 2 power supplies that are connected to my Sav64 to a double plug so all I do to switch on my c64 is plug one plug in and it turns on my c64 (well have to switch it on at its switch after plugin it in) and my 1541 disk drive.  The power supply contains 1A diodes without any cooling, while it is rated for 1.  TI-99/4A.  Reply reply My first one worked with my C64 with no problems. 5v, significantly higher than the expected levels.  Trying to get my old c64 up and running.  Reply reply I've just returned to the C64 after a 33 year hiatus.  If you suspect the switch, unplug the computer and rapidly wiggle the switch on/off multiple times.  By 1985 just about any C= The original power supply of my C64 was broken.  C64 PSU Tester - Commodore 64 Power Supply Tester, Measures Voltages, Currents, Ripple, OLED Digital DisplayCommodore 64 power supply unit (PSU) automated tester.  According to Electroware’s homesite (www.  But by far, the most prevalent C64 power supplies were the sealed and unventilated black and later beige/white ribbed plastic bricks with the Commodore logo injected directly into the case mold in North America or the slopped wedge like design used in Europe. 5-1.  Commodore 64. .  Even if the power supply is measured before being used, it can still fail after it warms up hereby making it kill the This is no problem, the power circuits in the C64 handle this properly.  To test your In your case, likely the voltage regulator has failed and I think you should consider yourself lucky that it didn't kill your C64, which is what these power supplies often do.  To add to the others suggestions as well, do check that your pi power supply is delivering enough amps to the pi.  A good site for all things repair and diagnostics Find a working C128 supply and swap a C64 cable onto it.  But thinking about it, I guess that is dependent on how stable your power is and if you have surge protection in place.  I’m not affraid keeping my Commodore on Power supply failures are among the most common problems among retro Commodore 64/128 systems.  Follow the Commodore spec for your connections, using a multimeter for confirmation, as the wire colors may not always be correct. com) the 5VDC line of the current C64 Datassette power issue .  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