3 of 3 people found this helpful
The variability in symptoms sounds like a bad connection. Re-seat or clean all the connectors, especially if the DSP is on a separate card. Also if it has a separate power supply - check all the power supply voltages against your schematic. If there is a bad power supply, check the electrolytic capacitors.
2 of 2 people found this helpful
It might also be worth unplugging the expansion module on the back, and running the scope without it. It likely has a DSP inside (for FFT). Perhaps the connector is faulty.
ok guys, thanks for the good advice,
i have removed the module, no joy.
all power rails measure well within the spec.
i have reseated all cables after doing my best to clean the connections.
the issue still exists.
does the fact that this happens only when toggling vectors off have any meaning?
Hi guys, newbie here, not sure if this is the right place, id appreciate directions to the right forum.
I recently bought a used hp 54645A off ebay.
It boots ok with no error messages, shows both traces and properly shows the square test signal.
Theres one issue with it - the display seems to freeze when i try to toggle vectors.
After a hard reset the splash screen shows "PANIC - DSP COMMUNICATIONS TIMED OUT".
Also - sometimes the display would boot up jumbled. I reckon the jumbled display is related to the freezes.
no joy with the hp/agilent documentation, but i did get a hold ofo the schematics for the scope, here.
Iv'e included some photos, hopefully they would make up for my non native/professional english.
Has anyone seen this before? any usual suspects?