Electronics > Repair
Agilent 34461A corrupted flash
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kanzler:
 Sorry for being stupid, but how to get uncompressed nk.bin file ?
Eng_tech:
I have a keysight 34461A that also has I believe corrupted flash. The spear CPU is not overheating and all supply voltages in the meter are spot on. The meter does not boot up and only displays a white screen, none of the button's work, and neither does the USB connection to the meter. I haven't gone much farther then measuring supply voltages. I have purchased a used supposely working front panel for a 34460a with the front circuit board but didn't receive it yet. I know keysight says do not swap out front panels from other units but I figured I would try when I receive it. Obviously, it probably won't work due to mismatch in model/serial numbers. I didn't pay much for it. Anyways, from reading these posts it seems this problem can somewhat remedied by reflashing the NAND. Does anyone have the actual process in steps to perform this fix, including firmware images to use? Thanks, any help is appreciated. I am pretty familar with firmware programming as I do this as part of my job at work.
 
analogRF:

--- Quote from: Eng_tech on October 02, 2024, 01:48:02 pm ---I have a keysight 34461A that also has I believe corrupted flash. The spear CPU is not overheating and all supply voltages in the meter are spot on. The meter does not boot up and only displays a white screen, none of the button's work, and neither does the USB connection to the meter. I haven't gone much farther then measuring supply voltages. I have purchased a used supposely working front panel for a 34460a with the front circuit board but didn't receive it yet. I know keysight says do not swap out front panels from other units but I figured I would try when I receive it. Obviously, it probably won't work due to mismatch in model/serial numbers. I didn't pay much for it. Anyways, from reading these posts it seems this problem can somewhat remedied by reflashing the NAND. Does anyone have the actual process in steps to perform this fix, including firmware images to use? Thanks, any help is appreciated. I am pretty familar with firmware programming as I do this as part of my job at work.

--- End quote ---
i dont think anybody "reflashed" the NAND here. Certainly I didnt.
the first thing to do was to hook up the UART debug port on the front panel and see if there are any messages.
still the CPU could be dead even if it's not getting hot
Eng_tech:
Haven't gotten around to hooking up serial just yet, but that is next. I'll report back on my findings when I do. I hate to toss this meter it was barely used by my company but is out of warranty and they were going to trash it. It was given to me to take home. Yes, the CPU could be bad as the one test point on the front panel was supposed to have a 24 khz signal on it but didn't have anything except 3.3 volts on it I think. Other voltages on the front pcb were good.
coromonadalix:
is there antyhing in that upd  file to help recover ??

https://www.keysight.com/us/en/lib/software-detail/instrument-firmware-software/34460a34461a34465a34470a-firmware-2367633.html
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