Hi All,
Reviving this thread bc I also am working on an MS2721B and encountered what I believe to be a firmware related issue.
I had my MS2721B opened up to repair an intermittent LO1 unlock. This issue is common with the VCOs in the SA due to cold solder joints. I was able to touch up the solder in and around the VCO and fixed the LO1 unlock issue. I had the instrument running for a while and checked the SA and TG operation. Everything was working fine.
I checked the FW version and it was 1.32. I saw on the Anritsu website that the latest FW is 1.51. I downloaded the USB thumb drive installer, prepped a new flash drive, and put the firmware package on the thumb drive. I put it in the instrument and followed the instructions as per the firmware update manual.
The instrument began with copying the files, then it was on the "Operating system loading" page for a while. I thought perhaps the instrument is just slow and takes a while, so I left it alone overnight.
In the morning, it was just on the initial "Anritsu" boot screen with no loading bar present. It must have been sitting there for hours. I pressed the power button and it turned off normally. I tried turning it back on again, and it just kept flashing the white "Anritsu" screen and turning off. It does this perpetually; the "Anritsu" screen turns on for 1 second, then goes black for a second, then on again.
I opened the unit up again and removed the firmware CF, just to try powering on. It does the same exact thing with or without the CF installed.
I ordered a CF reader since I don't have one, as well as a few NOS 512mb CF cards.
What should the unit do without the CF installed? I downloaded Anritsu Master Software Tools and I tried the "1-3-5" key combo on power up as well, the unit does not respond to this. Are there any other boot sequences or key combos I can try while I wait for a CF reader? Anyone else had this issue before?
Also, if anyone has a CF OS image they could share for reference, that would be great as well. I'm not 100% clear on what the contents of the CF should be, if I were to try and format it in my PC before reinstalling in the unit.