Electronics > Repair
Fluke 289 not quite sorted.
MihaiV:
Hi,
If it is U10 you are refering to, it is a LTC2415-1, and it is a sigma-delta ADC, 24 bit.
The second row contains the actual part number.
Datasheet in attachement.
MihaiV.
ehobby:
MihaiV,
Thanks for responding and providing the datasheet for the LTC2415-1.
I actually was looking for the datasheet for the LTC939CS which seems to be near impossible to find. Been hunting this for quite a while. Have looked in Linear databooks from around 2000 and all over the web, including the Linear/Analog website.
Thanks
maximalcho:
Hi MihaiV,
You can try what i did,First try to flash dump from kjk24 then from AnJu but from AnJu dumps i use only one file but I don't remember which of the two files I used fs or fis.There is also a high probability that the flash chip has bad blocks.Why waste your time and not order a new ram memory and a new flash chip according to what you describe your problem is in one of them or both.Did you try to reflow ram ic ?
kaiser:
--- Quote from: MihaiV on March 17, 2022, 07:17:00 pm ---I must have done something really wrong here...
I erased the entire flash yesterday and then I was able to program the first part of AnJu's binary (2.fs 0x10040000.bin).
Without using target RAM it only took 14592 seconds, but it completed successfully (in attachment). Today I tried to upload the remaining part ( 3.FIS directory 0x107E0000.bin ) but I couldn't! I got the same "Block lock-bit detected!" message on the J-Flash.
Prepairing for another 4h of uploading, I erased the flash again to "unlock" it, to flash the FIS directory and after that the rest of the fs. But I couldn't do any of it! The flash is empty, I can read it back, but I can't even write the initial content!
Is there a way to erase those lock-bits? Did I brick it?
--- End quote ---
Try shorting J4 jumper at power up to put into boot mode and try and read flash with J-Flash and the init script and use target ram ticked.. Hopefully you won't get any errors.. If no errors, then you should be able to write...
K..
MihaiV:
Hello everyone,
Here is what I did:
- Thank you Kaiser for the J4 tip: shorting it during power-up (and removing it after 2s) allowed me to use the target ram setting in Jflash. I am now able to upload binaries in the flash.
- The chip being blank, I uploaded first the "3.FIS directory 0x107E0000.bin" from post 83, followed by "2.fs 0x10040000.bin". After a re-power, nothing happened. The splash screen that used to appear before my gray screen did not come up and the green led remained constantly on.
- I erased the flash again and uploaded my initial flash contents (with application and bootloader). Now it was doing the splash screen and the gray screen after it. The led turns off, so I am back to my initial state.
- I attempted to upload only the fs ("2.fs 0x10040000.bin") and to keep my initial bootloader, but I couldn't write those sectors because (maybe?) they were not blank. So I erased only the sectors that would be occupied by the fs, starting from 0x10040000 until 0x107DFFFF.
- After erasing the selected sectors, I uploaded the "2.fs 0x10040000.bin".
- Repower and ... IT BOOTS!!!
- It went past the splash screen, greeting me with the lost date and time message (the back-up cap being gone). The buttons work, the beeper works, I can see the meter info (photos 1 and 2) ... awww, it's awesome!!
But hold on to your hats, it's not over yet!
I had the selector on VAC, and sure, it displayed 0.0000VAC (photo 3).
Check photo 4 on the mVAC: blank! Same on the VDC, Ohms A/mA and uA.
But on the mVDC it displays Ohms and on Diode/Cap it goes in uA. Lead detection works, by the way.
Continuity does not beep and Ohms measurement has a ~2.2K offset. Once eliminated with relative mode it measures resistors accurately.
This appears related to the weird voltages i measured during reverse engineering the rotary switch (in post 185).
Voltages available on pin 95 of MSP are not monotonic with rotary switching and some positions provide overlapping voltages.
Will investigate this now, starting with voltage measurement at the voltage divider input, followed by providing voltages externally, to identify the voltage range for each meter function.
I hope I don't have a swapped rotary encoder, I would be screwed! Since the meter works with a standard 287 software, is is clearly a 287 board swapped in a 287/Nuc case.
Thank you Kaiser, maximalcho and everyone for al your tips and advice, I wouldn't have don it without you!
Now, to deal with the rotary...
Navigation
[0] Message Index
[#] Next page
[*] Previous page
Go to full version