Aug 052014
 

Got today in the mail this mint original Konami X-Men PCB bought as faulty:

X-Men_PCB

Once fired up I got this:

X-MEN-RAM/ROM_test

So, RAM/ROM test reported a bad IC @37F but this was not the real location of the IC since there was no location 37F on PCB.So, clearly there was some trouble in the tilemap generation, this was confirmed by the word “BAD” which became “BCF”.So,  I launched MAME:

X-MEN_MAME_test

 

and, comparing the emulator and real PCB test results screens,  I could identify that the faulty IC reported by test was the Panasonic MN4464 (6264 compatible) SRAM @ 15F

This confirmed my theory about bad generation of tilemaps since this SRAM is used by the near ‘052109’ ASIC (tilemap generator).

So, time to desolder the IC and test it out of circuit corfirmed the RAM as bad:

MN4464_testing

 

Fitted a socket and a spare 6264 SRAM and I could add also this cool game to my growing collection!

X-MEN_fixed

 

 Posted by at 7:24 pm

  2 Responses to “X-Men repair log #1”

  1. How do you go about using mame to pin point your problems?

  2. Hi, pardon, I express myself bad in the repair log, I just corrected it.I simply compared the MAME and PCB screens of the RAM/ROM test so I could identify what was the right location of the bad RAM on my board.MAME is a good bench test for any arcade repair.