Mallinckrodt NELLCOR NPB-4000 Service Manual page 38

Section 4: Power-up Defaults Menu and Diagnostic Mode
4.3.1 Error Codes
4.3.2 System Information
4-4
The Diagnostic Menu lists the test and system-related information screens.
Selection of an item in the menu will invoke that test or information screen. The
test and information screens that appear in the Diagnostic Menu are as follows:
• Error Codes
• System Information
• System A/D Values
• NIBP Test
This screen displays the 10 most recent error codes logged by the NPB-4000/C.
After 10 error codes have been logged, the oldest error codes will be deleted as
new error codes are added. The error code is displayed in hexadecimal.
Adjacent to each error code will be the date/time when the error code was
recorded. Error codes may not be changed or reset in this screen. When in the
Error Code screen, the "Return" item is always highlighted; pressing the knob
will return the user to the Diagnostic Menu. Rotating the knob, while in the
Error Code screen, will have no effect.
Refer to paragraph 5.6.2 for more detail on error codes.
This screen displays several system-related items:
• Monitor On-time: Displays the number of hours, rounded to the nearest
hour, that the Main PCB has been operational. This value may not be reset.
Note: The Monitor On-time value is stored in nonvolatile memory located in
the real-time clock chip, when a new Main PCB is installed, this value
will be reset to zero.)
• Backlight On-time: Displays the number of hours, rounded to the nearest
hour, that the LCD Backlight has been operational. This value may be reset
to zero, for instance at the time when a technician changes the backlight or
installs a new LCD.
• Recorder On-time: Displays the number of hours, rounded to the nearest
hour, that the Recorder has been operational. This value may be reset to
zero, for instance at the time when a technician installs a new recorder.
• Battery Deep Discharges: Displays the number of deep-discharge cycles
seen by the battery. The monitor records a deep discharge cycle when the
battery voltage reaches 5.6 volts, the voltage at which a "Low Battery" alarm
is issued. This value may be reset to zero, for instance at the time when a
technician installs a new battery.