Location of work ram on MV2- 01

I have a 2 slot that gives Work ram erro.

Work 00C1006E

Write 5500

Read 5500

Most ram topics seem to cover backup ram or video ram in this forum, so I am going to just just change them and hope for the best, but where on the 2 slot are they?

There seem to be 3 times 2 lots of 43256 locations on the board, I am just not sure which ones. Is it the 2 above the bios, the 2 more or less center or the 2 next to the credit display connectors?

Please help, I am sure someone knows this, and once I do it should be an easy fix, thanks!

Raz? MKL? Channel?

Hey...

I'm out away from the shop for a bit... so I don't have a board to look at.

The work RAM and the backup RAM are both connected directly to the CPU. The difference is that the backup RAM is connected to the battery for power where the work RAM is connected to the +5v pin on the JAMMA connector for power.

That'll help you narrow it down to 2 chips.

I made a post on diagnosing SRAM problems but that won't help you on work SRAM problems since if you short out a data line on those the system will just not boot at all.

RJ

I got all sorts of results from all 6 chips regarding +5 volts.....can you just tell me which ones they are in the pic?

The work ram are the one ones you have circled right next to the 68000 and Yamaha

The 2 in the middle of the board, under the CPU, and to the right of the Yamaha chip are the ones.

Thanks a lot, I'll be sure to post how I get on.

I put up a post up on my forum section on newlifegames.net on how you can replace those SMT chips with standard soldering gear and limited tools.

http://newlifegames.net/techforum/index.php?topic=6803.0

You should practice on some old scrap boards first before trying to tackle that project yourself.

RJ

I just use continuous flow to both remove and reinstall chips with solder wick, been doing this for years and I haven't lifted a trace or damaged a chip in over a decade with this method.