Super Street Fighter 2: The New Challengers repair log

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Nov 092010
 

As with the 1944 board, this came from the same seller with the same fault of a solid blue screen.

and like the 1944 board also was that the battery still had 3.6v present, the difference being was that the CPS2 suicide test EPROM didnt work with this indicating that the decryption code was still present in the memory. It is possible for the decryption code to get corrupt and with no other signs of fault I took the plunge and removed the battery, this time thought I discharged the capacitor next to the battery to make certain that the RAM with the decryption code in lost all power. The suicide test EPROM now worked.
After burning 5 new 27C4096 EPROMs for sockets 3 to 7 I fired it up and all is well again.

1944: The Loop Masters repair log

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Nov 092010
 

Bought 2 boards off ebay the other day, one was Super Street Fighter 2 The New Challengers and the other was this 1944 The Loop Masters.
Both were sold as being faulty.
When I fired this up it gave a solid blue screen.

This is a classic sign that the board has suicided so to make sure I opened it up and inserted my CPS2 test eprom (available from CPS2SHOCK site) into ROM slot number 3.
It loaded up confirming that the board had suicided.
The strange thing was that the battery was still giving out 3.6v but as this was one of two board with the same indicated fault I assume the previous owner had done something silly.
Only the EPROM in slot 3 requires replacing to phoenix this game so with that done and the battery removed I fired it up again.


I would have liked to keep it original but there is nothing I can do about that now.

1942 repair log #1

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Jul 182010
 

I bought this 1942 board some time ago for very little as it needed repaired.

This was my second board repair so took me a bit longer than what it probably should have.

The symptoms of the fault were the character planes moved from its starting position right to the top of the screen and appeared again at the bottom, this cycle just repeated. Also the backgrounds were all messed up  and at a certain point in the rolling demo, the game would freeze.

Now for the other problems. When things are in the wrong place or not behaving as expected then RAMs are a good place to start probing. Its worth mentioning now that MAME is an excellent tool for seeing how things should be.

I checked the address lines on RAM (TMM2016) @ N10 + N11 with a scope, very weak signals on several lines. I desoldered the RAM and checked it in my ABI Chipmaster, came up as “Out of spec”. Replaced this with a known good one from a scrap board and all working nicely again.

Now I don’t have a setup capable of housing a vertically orientated monitor nor do I have any plans ever to get one so this board is going to be sold.

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