...well, because this sounds familiar I didn't start a new topic (sorry Kenramesh). I also have trouble with our company's HP8595A spectrum analyzer
after replacing the internal 3.7V battery (which was from 1991!)
Yes, I know there is another guy with HP8595E but he has the luck that his analyzer still responds while
mine here shows these things after startup:
FAIL: 0030 0000000000 FREQ UNCAL
I tried to do the internal calibration (lead to this):
CAL Signal not found (I also tried an external signal generator set to 300MHz -20dBm)
Last but not least I tried internal diagnosis
(after a while the analyzer doesn't respond anymore to pushing buttons)
Pushing the "Preset" button leads to a bootloop (restart also, I have to unsolder the battery and discharge the 0.22F capacitor
in order to get the analyzer started).
It seems that there are more bugs to fix.
I don't have to repair it on my own, I'm absolutely happy if you could name me a capable service provider (in europe) who is
specialized in repairing (and calibrating) of old spectrum analyzers.
Thanks