NPs Paperboy Restoration

Arcade Collecting > Restorations & repair

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ChadTower:

Nice pickup... I love Paperboy. One of the few rasters I would consider owning.

Neverending Project:
First I need to find out what shape the power supply is in. By the looks of it (and the looks of the interior of the cabinet) something fuzzy has been making its home here.

So after a bit of clean-up, this is what I am left with:

I would love to tell you the good news that all the voltages look good. The problem is that all the fuses are slow-blow, of which I have none. My local auto-parts store doesn't seem to carry the slow-blow fuses, so it's off the the land of shipping charges that I go. I did manage to find one fuse in the cabinet that is rated correctly, and still good.

Ah well, slow start I suppose.

Neverending Project:
So I am sitting there watching Purple Rain (because it was on, that's why), and it dawned on me that I had some 4A slow-blow that I ordered for my pins. I had enough, so I stuck a 10A slow in place of the 7A just so I could test the voltages.
:blowup:

No, nothing blew up. I just always wanted to use that smiley.

But the output that was supposed to have 10.3VDC was reading almost 15VDC. Now, do you think this is because:
a) Big Blue needs to be replaced
b) the rectifier needs to be replaced
c) there is no load on the power supply
d) all of the above
e) none of the above
f) some of the above

Time's up, please put down your pencils.

Oh wait, I still need some advice... pick up those pencils again please. Hey, you, ChadTower... stop looking at Q*Bert's answers!

ChadTower:

Big Blue always needs replacing if you can't vouch for it. If it's dead it will not be smoothing out the current flow and that pounds on everything down the line. Especially on an Atari cab, don't even think about it, replace Big Blue.

Did you check the BRs? They could be dead too. Use the diode check on your DMM. If you don't know how to test a BR yet now is the time to learn as you'll need that a lot for your pins too. Marvin3M has a great section on that someplace. Where are the BRs? I don't see any in that picture.

Take an AC reading on the 10.3v line. There shouldn't be any but if there is you know you've got AC ripple which points right at both the Big Blue and

Neverending Project:
I just noticed that there are two giant 27000mfd capacitors - the one here on the PS, and a second one right after the PS (both can be seen in the second pic in reply#1 above). It is the same lines that run through the first cap. Which one is technically big blue? I guess they should both be replaced?

There is only one BR on the PS, and it is mounted underneath. I will check that as well. Thanks.

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