Electronics > Repair
Looking for Mettler Scale ROM backup
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gmac34:
there is a "for now" cheap scale on eBay that could be a good parts donor
given the state of the vfd I would imagine the cell to also be mechanically damaged but the main board may be ok

https://www.ebay.it/itm/335651376850
jamarjan:
Thanks. The current bidder is me ;-)
gmac34:
Good luck then.
In the meantime I was trying to figure out which values in the EEPROM might be those of the linearity adjustment as my PM3000 is a bit out of specifications, it's a challenge to figure out what is what.
The most confusing part is what happens to the parameters when they get written in memory, for example the first parameter for all 3 of my scales is written as AEBA even tough it is three different numbers written on the various parameter sheets. 3 different numbers that wen converted to hexadecimal end in AEBA but I cannot understand what the first part might be there for
gmac34:
Well, it seems you got it. the main board has the same part number between the pm6000 and 4800 hopefully you will just have to move over the reference resistors R41 and R42, and the memory
jamarjan:
Yes, I bought the scale and it's on its way to me now
I can tell from the pictures that the scale has been mistreated so I don't have high expectations
I will let you know when I install the circuit board, and ill also try to dump the memory to have another bin for analysis ;-)
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