C64 PSU question

[Guest 123]

Could someone tell me what the 4 C64 PSU plug pins are?I can not figure it out.I need to test the power supply,because it may have been damaged by moisture in the past.Looking at the plug on the power supply itself,with the indentation(dent that makes sure it goes in the socket right)at the top,what is the top left pin,what is the top right pin,what is the bottom left pin,what is the bottom right pin?I tried to figure it out by the C64psu schematic on the site,but could not .I want to make sure that the correct AC and DC voltages are coming out of it.Also,in that schematic,it doesn't mean that you are supposed to use 2 switches right?And,why would I want to replace the sid module rectifier with a 1N4001 diode?I spose I should build the little psu circuit on to a seperate little board?Thanx.

[d2k]

I couldn't figure it out either :p I've tried the c64 psu circuit as in the pdf on 2 (3 including the first) c64 psu's and everytime - as soon as u switched the circuit on the +5 and +12 are correct, but when i switch it off the +5 stays at +5 and the +12 just drops and stays to +5...:/

Not very helpful to you i know...

Dan

PS: that black dot by the switch in the pdf still remains a mystery!

[Guest 123]

Yeah,I noticed that T.K.never did reply to some of your

PSU questions.I wish he could help us out on this.Maybe I will try to email him privately again.

[Guest toak3]

I am also interested in the pin orientation for the PSU.

My socket and plug are not like the one pictured in the PDF on the website, i have 7 places for pins on the socket, from 1 0'clock Clockwise to 11 o'clock (about), and I cannot figure out from the PDF what the orientation of the connections should be.

the plug has 4 pins at 11, 1,5 and 6 oclock which also doesn't agree with the schematic.

I figure some of you have the same situation (maybe i'm not understanding something?).

Thanks for your time,

Alex Norman

[Captain_Hastings]

I'm just working on the PSU of the SID as well.

On my C64 PSU, the connections are like in the PDF.

On the schematic, the pins are displayed as if you look at the plug of the C64 powersupply, that is the same as looking at the back (the soldering pins) of the 7-pin DIN connector inside the C64.

123: the powerswitch is a DPDT (double pole double throw) switch, which means it has two switches in one.

Hope this helps!

cheers

[Guest 123]

As far as the 4 pins go,I THINK the top 2 are the 9VAC

and the bottom left one is ground,and the bottom right one is +5VDC.I could be wrong,so correct me if I am.

I tried testing my psu ,and I think it is dead(I got burned on ebay).It measured something(incorrect) at first,but now,nothing....I need to find another one for cheap.

[d2k]

okay, so i've just learned that I had the circuit wired correctly all this time - it's just as I had nothing connected to the psu circuit (including power led), it meant the +5 would always remain, even when switched off...

so after the last few months without any SID, i can now use it again! Thanks Pilo!!!

I'd still like to know what that infamous black dot is about tho...;p

[Guest 123]

I am a little confused.D2k:Could you explain a bit more in depth of what your problem ended up being caused by?And,where is the post by Pilo that helped you out?

I think that maybe the black dot is just supposed to be the connection point to the switch maybe.

[d2k]

The problem was only my ignorance in not knowing that a psu need's a load to send the power to, and that if there isnt anything to send the caps will store the power which is why I was getting +5 on the +5 and +14 would drop down to +5 even when i switch of the psu...

I'll get some pics up of the plug and breadboarded circuit in the next days if u dont get an answer b4 then...

Best

Dan