Electronics > Repair
Looking for Mettler Scale ROM backup
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gmac34:
Hi, I have a Mettler scale with a bad ROM, I tried to contact Mettler to see if they would share the 30y old ROM file with me but did not get an answer. 
If anyone has a copy, I think I need the "STANDARD SOFTWARE ME-34172" any version between 10.45 and 10.50 should work fine regardless of the model of the scale, this should be compatible with all scales from the era with the same cartridge ROM system.

Attached a picture of the cartridge, inside there is just a regular UVPROM
Thanks!
fzabkar:
Can you upload a ROM dump? Or perhaps several ROM dumps? Perhaps it would be possible to perform a bitwise AND against all your dumps to create a hybrid ROM, assuming that errors are intermittent.
jamarjan:
Hi gmac34
attached dump of the ROM from my cassette
ME-34172 STANDARD V10.32
I hope it will help you fix your scale.

I myself am struggling with a PM4600 scale that is not working.
Probably as a result of dead low voltage dc capacitors, my NMC9346N chip zeroed out.
According to the service manual of the scale, you need to program it with a special cassette and an external keypad.
What is the model of your scale?
gmac34:
hi  jamarjan, thanks for the dump, I actually managed to get a newer version dumped as well, buying another scale...
I attached them here as well for posterity.

Regarding your problem, I believe you will have to contact a Mettler service center, try a few and see if one offers a reasonable price for the operation, I haven't manage to find copies of the service cassettes, but without those you will not be able to frost initialise the memory and tell the scale what it is but also input all the parameters for linearity and temperature compensation specific to your cell. I think they are written down in the real plate that you can remove to do the corner load adjustment.

I also have pm4600, so maybe I could dump that memory, but my linearity and temperature compensation data will not be correct for your scale.
I think I should dump that for posterity to keep my scale running, but that ic is not on a socket I'm a bit afraid of trying to get it off...
jamarjan:
Wow wow wow! What incredibly fascinating news!
Thank you for your response.
Desoldering the 8 pin ic is a relatively simple matter.
A tin extractor and a braid allowed me to desolder in a few minutes.
Later you can insert a 8 pin socket.
Would be very grateful to you if you decide to rip this ROM.
According to the service manual, the basic programming of the scale type just involves specifying the model and measurement range.
Calibration of the parameters you write about is a completely different matter and you need yet another cartridge and procedure.
The scale I am repairing is rescued from being scrapped and is actually for learning purposes.
Well, and that beautiful VFD (in my case it works like new)!
Also, once again, I would VERY much appreciate it if you would rip copy this internal IC at your leisure.
I am absolutely not in a hurry. It can be in a week or a month.
Thanks in advance!

attached a dump of my IC- blank except for the first 2 lines
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