stfm STFM memory upgrade advice requested

[Guest]

Hi

hoping someone can advise.

I have a working stfm with an Xtra ram 4mb upgrade.

However, on returning to the machine after a few months it doesn't do anything on power-up.

 

Once I disconnect the xtra ram all is fine and it boots without problems.

 

is it simply a case of faulty ram? or are there specific tests i can carry out to identify the cause of the problem?

 

i'm assuming it could be any of:-

ram upgrade module, simms, cables, upgrade connection on mobo

 

any help appreciated

[GadgetUK]

Could be faulty SIMM, or bad connection to the MMU (most likely). There are a couple of 74 logic chips usually sat on the MMU board, there's a chance of a fault there but it's more likely RAM or MMU connection.