| Electronics > Repair |
| Fluke 199C scopemeter repair |
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| feedback.loop:
--- Quote from: asis on January 18, 2023, 09:07:37 pm ---Hi feedback.loop, As far as I understand, the serial number is programmed into the D-ASIC OTP ROM area at the production stage. UHM Universal Host Mask checks it. There is a DEBUG X3510 connector, but I haven't explored it. --- End quote --- Why it is also in the flash memory? Why in two places? Why the scopemeter works fine with a memory module from some other scopemeter (except calibration won't work, as I understand) |
| Assafl:
--- Quote from: feedback.loop on January 18, 2023, 09:33:17 pm ---Why it is also in the flash memory? Why in two places? Why the scopemeter works fine with a memory module from some other scopemeter (except calibration won't work, as I understand) --- End quote --- I don't know why they kept the serial itself in two places but the ROM is where (I think) they kept the model type (192, 196 or 199). The serial number is then linked to the type (so that certain serial numbers are/aren't allowed to get certain updates - and the user doesn't get a free BW or feature update). It was mentioned in one of the longer form service manuals that when the main board is not available except to service center as they have to program the device type in the board. I know that some of the Scopemeter repair shops do a model updates so maybe that ROM is rewritable? Or they use a hacked firmware (like the Bushealth firmware). |
| feedback.loop:
I would love to know how to tweak the content of the flash to make the serial number there match the scopemeter (SN on the back cover). Suppose we have a scopemeter with a missing module. How can we produce a proper replacement from a copy of a module from another scope? |
| asis:
Hi feedback loop, You just need to try to change the serial number in the dump and write it to any module you have. In what addresses and chips - I already showed you. You will probably need to find a place and recalculate the checksum. The serial number can be taken from the photos posted on EBAY. And, the QI_11 request will let you understand where it was read from. |
| rauldm:
Someone know if is possible upgrade Fluke 123 to 125? similar to 199c to 225c, Regards. PD My 199C is now 225C. |
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