|Re: Looking for Mr. David Smith. Was: Expiring EPROM's inHP's?|
Message #3 Posted by Wolfgang Miller on 8 Sept 2006, 7:19 p.m.,
in response to message #2 by David Smith
I'm very, very happy, that you are obviously relativly active in this message board :-))).
The PE6000, I mentioned, display's only "error". I don't have any service manuals, so I replaced the MCM2801 and hoped, that the balance does init the memory for itself, when there is a complete empty storage.... no way...
Do you think, the filtering capacitors could produce a similar message? My "feeling" says, that the weighting cell (and thefore the analog circuits)is working ok (the "pendulum" stays in the middle of the "power-compensation-coil", independent whether you apply less or more force to the weighting table.
If I could receice the dumpvalues of the 16x 16bits from you, that are stored typically in that memory, I would build a writing circuit for the MCM2801. The datasheets are easy available and it don't looks like whitchwork. Ok, it would be some work, but I like Mettler balances and my old PM4600 remained at my divorced wife, so I need a new one...
If you got the possiblity, to rewrite the EEPROMS easier, I could also imagine, that I send you my two MCM's and you rewrite them for me. Naturally, I would pay your work and backshipping costs..
At last, one more thougt. One guy of mettler, I talked to before years, mentioned, that after each repair of the analog circuit these balances had to be "reinitalized". Perhaps there is a testpoint, which is measured with the internal A/D-converter to indicate an "error" in the analog board. In this case, the data from a other PE-6000 wouldn't help, or only by random???
Is it ok, to post such long "off topic" text's here or should we communicate per mail? Me mail address would be Thomas.WolfgangAT