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Program ROM Check-sum Errors (705 to 708)
The instrument power-on diagnostics perform a check-sum on each programmed ROM (A2
Controller assembly). If an invalid check-sum is found for a particular ROM, an error code is
generated. If a defective programmed ROM is found, replace it with another ROM with the
same HP part number. Refer to Chapter 4, "Replaceable Parts."
Although some of these errors might result in a blanked display, it is possible to read these
errors over HP-m. Refer to "Troubleshooting to a Functional Section" in this chapter.
705
ROM
U306
706
ROM
U307
707
ROM
U308
708
ROM
U309
RAM Check Errors (713 and 714)
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.
713
U301
RAM
714
U300
RAM
Microprocessor
Error (717)
Refer to Chapter 9, "Controller Section."
717
BAD uP! !
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
BATiERY?
Model Number Error (719)
If this error occurs, return the instrument to a service center for repair.
719
MODEL .1
6-32 General Troubleshooting
Check-sum error of program ROM A2U306.
Check-sum error of program ROM A2U307.
Check-sum error of program ROM A2U308.
Check-sum error of program ROM A2U309.
Check-sum error of system RAM A2U30l.
Check-sum error of system RAM A2U300.
Microprocessor not fully operational.
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.
Could not read ID string from EEROM A2U501.
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