Electronics > Repair
Fluke 289 not quite sorted.
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MihaiV:
Hello,

I made a optical USB adapter (as in reply nr. 2 here: https://www.eevblog.com/forum/buysellwanted/w-t-b-fluke-ir189-usb-usb-cable-280180-series/msg1436629/#msg1436629). I built the one without comparators and tested it in optical loopback mode at 115200 baud.

Stuck it in the meter's "eyes" and no response. I traced the signal through the photodiode, R150 to U23 (an OPA364). Also tried it with TX inverted, but in both cases there was no response on the IR led. The signal looks good, even at 57600 max baud coming from the FlukeView forms software. Interesting fact that the negative supply of U23 comes through a diode in CR12. Perhaps to keep the inputs/output in proper operating range (even though it is RRIO).

I have one more lead with the Jlink, to check RAM operation as kjk24 instructed above, but after that I'm out of ideas.
Arhigos:
At this point i think you probably have bad bga flash chip or corrupted flash, or dead cpu.

You will not get ir communication until arm processor is fully boot up.  You have 2 ethernet connectors for that kind of debug, but I don't know how to use them.
maximalcho:
Hi MihaiV
did you try to connect fluke with J-Link because I fail. I try to connect it according to J-Link pinout without success.
 
I have another jtag programmer  with which I manage to connect to MXS but I do not have access to flash memory or maybe flash is dead.
MihaiV:
Hi maximalcho,

I was away for the week so I didn't have a chance to try it.
Will try something this weekend and posts results (if any) here.
maximalcho:
i fixed my multimeter.I changed flash ic and program with one of dumps from here.The multimeter is now fully functional.
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