708 ROM U309 Check-sum error of program ROM A2U309.

709 ROM U310 Check-sum error of program ROM A2U310.

710 ROM U311 Check-sum error of program ROM A2U311.

RAM Check Errors (711 to 719)

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 in Chapter 9.

711 RAM U303 Check-sum error of system RAM A2U303.

712 RAM U302 Check-sum error of system RAM A2U302.

713 RAM U301 Check-sum error of system RAM A2U301.

714 RAM U300 Check-sum error of system RAM A2U300.

Microprocessor Error (717)

717 BAD UP!! Microprocessor not fully operational. Refer to Chapter 9, “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 BTl Battery and the battery backup circuitry, refer to “STATE and TRACE Storage Problems” in Chapter 9.

718 BATTERY? Nonvolatile RAM not working; check battery BTl.

This error can also be generated if the battery has been disconnected then reconnected. If this is the cause, cycling power clears the error.

General Troubleshooting 6-33