HP 54710A User's Reference Manual page 168

Memory error occurred in plug-in ?: Try reinstalling plug-in
The checksum or contents of the plug-in's memory is incorrect. The ?
indicates which plug-in has the error. Check the following:
Reinstall the plug-in.
Finger tighten the knurled screw on the front-panel of the plug-in.
If these actions do not solve the problem, there must be a hardware problem
in the mainframe or plug-in. Call Hewlett-Packard for service.
Overload condition on ?
The input signal on channel ? is too big. The overload protection hardware
has been activated. The message stays on screen until the overload is
removed. Check the appropriate plug-in manual for overload limits. Each
plug-in is different, and not all have overload protection.
Please correct overload condition, then press Overload Cleared
This is further prompting that occurs when the menu of an overloaded
channel is selected. Actions to take include the following:
•
Removing the input signal
•
Reducing the amplitude of the input signal
•
Decreasing the channel sensitivity
•
Changing the input coupling from dc to ac (if the signal has a large offset)
Plug-in configuration has changed
The physical configuration of the plug-ins is different from when the setup
was saved to memory or disk. The system has tried to establish the same
setup.
Plug-in ? is not supported: System firmware upgrade is needed
In the future, new plug-ins may require a certain revision of system
firmware for proper operation. The ? indicates which plug-in is not
supported. Use the upgrade service to keep the system firmware current.
Messages
10-5