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, “Controller Section.”
711 RAM
U303
712 RAM
U302
713 RAM
U301
714 RAM
U300
715 RAM
U305
716 RAM
U304
Checksum error of system RAM A2U303.
Checksum error of system RAM A2U302.
Checksum error of system RAM A2U301.
Checksum error of system RAM A2U300.
Checksum error of system RAM A2U305.
Checksum error of system RAM A2U304.
Microprocessor Error (7 17)
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
BTl
Battery and the battery
backup circuitry, refer to “STATE and TRACE Storage Problems” in
Chapter 10, “Controller Section.”
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.
Model Number Error
(719)719 MODEL
#?
Could not read ID string from EEROM A2U501.
If this error occurs, return the instrument to a service center for
repair.
General Troubleshooting 7-39