Success !!!
Thank you evereyone for your replies and advices to my memory trouble. I finaly succeeded in changing the faulty DRAM bank thanks to Exxos ram set. It was rather difficult to unsold the chips. I used a desolder pumping station to archive that, but even with this efficient material it was hard to get the chips out of their holes (I destroyed one of them !). Yes i could have cut the pins and then desolder them out but I wanted to preserve the chips as much as possible in order to test them in case of success.
So I desolder the bank, soldered brand new sockets and plugged the new DRAM in. And voilà ! my 1Mo memory is back !!!
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I then tested all the chips one by one, by replacing them one at a time into the new bank. Thanks to the diagnostic card I found only 2 of the chips (upon 16) where out of order.
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Plus the one I destroyed...
Added a brand new 1.4 TOS.
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And here is my baby
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Thanks again everybody !