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Author Topic: The Last MPU  (Read 231 times)

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Offline Stayouttadabunker

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The Last MPU
« on: February 01, 2024, 09:20:00 AM »
I wonder exactly when the last S2000 50x MPU was made?

I don't think there are any "fresh motherboards" around.  :rotfl:

Most of them, on the Topics here, have been dying out for years with the micro-circuitry traces on the boards being eaten alive - because of rottening, leaking Varta batteries.

I must add that in our NLG File System, there is a Maintenance Procedure manual dated November 15th, 1997.
That could very well mean that some of the MPU's floating around presently, may be as much as 27 years old.
« Last Edit: February 01, 2024, 08:48:23 PM by Stayouttadabunker »
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Offline shortrackskater

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Re: The Last MPU
« Reply #1 on: February 01, 2024, 09:47:51 AM »
I have a nice fresh one packed up in my parts cabinet, free of the dreaded Varta.  :yes:
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Offline Stayouttadabunker

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Re: The Last MPU
« Reply #2 on: February 01, 2024, 09:56:53 AM »
That's cool STS!  :cool_thumb_up:
What date is etched onto the circuit board itself?
You know me...just wondering?! lol  :scratch-head_3:
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Offline lookes

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Re: The Last MPU
« Reply #3 on: February 01, 2024, 10:19:08 AM »
I've got one in front of me that was made late in 2003. The last ones were the worst made ones. Made in Mexico by Keytronic Corp. If you look through the board at a light it looks like a starry night lol...
The slightest bit of varta juice destroys them. The vias (board feedthrough holes) are all open. The varta electrolyte or or even vapors back up under the coating over the traces where they connect to the vias, and break the connection. It can also get to the back of the board easily as well as inside the board. (All 50X boards are 3 layer. The inside is just 3 separate ground planes.)

It can be very tedious finding all the breaks, although under a microscope you can see a discoloration at the via most of the time. If there are breaks under U68, or U69 it's game over. Not worth the time.

Anyone have a newer one? I'd be interested too!

Edit just found a late 2004. It is one of the Chinese made boards which surprisingly, are the 'good' ones.
« Last Edit: February 01, 2024, 10:42:48 AM by lookes »
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Offline shortrackskater

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Re: The Last MPU
« Reply #4 on: February 01, 2024, 10:21:00 AM »
Quote from: Stayouttadabunker on February 01, 2024, 09:56:53 AM
That's cool STS!  :cool_thumb_up:
What date is etched onto the circuit board itself?
You know me...just wondering?! lol  :scratch-head_3:

This means I have to find it! Give me a couple hours. It's in "Big Green" - the cabinet in my garage, with basically everything "slot machine."

Side note: I always wondered wen the last Pinto was made? (The color green reminded me the times I fixed those cars for two friends, both had green Ford Pintos!  :rotfl:
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Offline Stayouttadabunker

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Re: The Last MPU
« Reply #5 on: February 01, 2024, 10:28:08 AM »
No rush STS.
I'm just wondering what year MPU's went out towards the West versus me, out here in the Northeast.
I will post the years of the S2000 MPU's I have out here when I get back in Monday
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