Fresenius Medical Care 2008k Technical Manual page 51

Upon power up in Service Mode, the following screen will appear on the front
panel display:
Select a calibration by touching the appropriate calibration button.
Calibration procedures that have a red button must be completed before the
machine will operate in Dialysis mode.
Select the desired calibration, then press the [CONFIRM] key to begin the
procedure.
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Caution: Once a calibration procedure is begun, pressing the [CONFIRM] key
usually updates the calibration data in the EEPROM. Be careful not to press the
[CONFIRM] key unless you want to change the calibration data. To leave a
calibration procedure without changing the data in the EEPROM, press the
[Escape] key.
A safety feature in the machine helps prevent mis-calibration. If a calibration
value outside of acceptable limits is entered, the machine will reject the
calibration data and the message OPERATOR ERROR will appear on the
display screen. The data stored in the EEPROM will not be changed if this
message appears.
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Fresenius 2008K Calibration Procedures
P/N 507296 Rev. A