348 Chapter7
General Troubleshooting
Error Messages
710 ROM U311 Checksum error of program ROM A2U311.
RAM Check Errors (711 to 716)
The instrument power-on diagnostics check the
program RAM. This includes the two RAMs used for
STATE storage. If any STATE information is found to
be invalid, all data in that RAM is destroyed. A
separate error code is generated for each defective
program RAM. All RAM is battery-backed. See “State-
and Trace-Storage Problems” in Chapter 10 .
711 RAM U303 Checksum error of system RAM A2U303.
712 RAM U302 Checksum error of system RAM A2U302.
713 RAM U301 Checksum error of system RAM A2U301.
714 RAM U300 Checksum error of system RAM A2U300.
715 RAM U305 Checksum error of system RAM A2U305.
716 RAM U304 Checksum error of system RAM A2U304.
Microprocessor Error (717)
717 BAD uP Microprocessor not fully operational. Refer to Chapter
10, "Controller Section."
Battery Problem (718)
If STATE or TRACE data is found to be corrupt, the
processor tests the display RAMs and the program
RAMs containing the STATE information. If the RAMs
are working properly, this error message is generated.
To check the BT1 battery and the battery backup
circuitry, refer to “State- and Trace-Storage Problems”
in Chapter 10 .
718 BATTERY? Nonvolatile RAM not working; check battery BT1.
This error can also be generated if the battery has been
disconnected then reconnected. If this is the cause,
cycling power clears the error.
Model/Option Number Errors (719 to 720)
If one of these errors occurs, return the instrument to a
service center for repair.
719 MODEL #? Could not read ID string from EEROM A2U501.
720 OPTION #? Cannot identify an option number.
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