Hello again
It would seem I am still having problems with the printer. After replacing the EEPROM, and syncing the serials I now have error 124-314; IOT Speed Fault. The printer is a Xerox DocuColor 240 without finisher or high capacity feeder.
From what I can gather, the wrong settings are in the chip (SYS1) and have been copied across to the other two (IOT and SYS2). The printer is now unusable - I have tried NVM initialization from both the diagnostic menu and the PWS software, and have gone through checking the NVM values but I cannot get it working.
I understand that under normal conditions you would have to send away for a new properly programmed EEPROM chip from Xerox. It seems however that while the chip is a simple 24c08 EEPROM which I can get for £0.24p, the supplier I contacted wants £180 for a replacement chip from Xerox! I don't even believe that includes programming either. The main concern also is the time involved, as the machine is now useless.
The only fix I've been able to find is to replace IOT, SYS1 and SYS2 with programmed ones from Xerox. I really don't want to have to do this if possible though.
Here's the technical bit:
I'm fairly familiar with electronics and using an Arduino microcontroller I've put together a simple EEPROM reader, and I have been able to view all of the data stored on the chip. It seems to have been wiped of the correct settings, although I have found the serial number and product number in there. I'm hoping that if I can put the right settings in there, such as the IOT speed, then I might be able to salvage the situation without having to go through Xerox. Once it works, I'd also be able to copy the data onto another eeprom very easily (as I said they are about 24 pence each, found on CPC), meaning I can have a backup, and also anybody else could too if something similar happened to them.
Also if required I believe this process could be used to modify other settings such as billing meters if they are incorrect, although obviously the main idea here is to get the printer working again.
If anybody has any ideas that might help, or know how I could salvage the printer, I'd happily help in return by offering programmed backup EEPROM chips for these printers which could restore these settings if anything ever went wrong. I can easily change the product number and serial to match any printer upon request. I'd only ask enough to cover my costs.
Thank you in advance to anyone who might be able to help, this is really important to get working again as I'm sure you can understand.
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