Fresenius Medical Care 4008 E Technical Manual page 203

The "CPU1: RD DIGITAL INP" menu item includes the "I:CPU1_KEY_TESTING" item, which
serves to perform the key test.
The key actuated is indicated on the alphanumeric display.
The UP, DOWN, CONFIRM, SELECT and I/O keys have not been implemented, since their
function can be tested by selecting the corresponding menu.
CALIBRATION
DIAGNOSTICS
MISCELLANEOUS
SETUP MENU
5-4
Fresenius Medical Care 4008 4/08.03 (TM)
Note
In the diagnostics program, the signals are listed in the order of their electric
connection, i.e. in latch groups of 8 signals each, according to the 8-bit data bus
and according to the latch numbering on the circuit diagram (e.g. P.C.B. LP 633:
CS_LATCH0 – CS_LATCH6).
The are not divided into groups of pertinency (e.g. all Bibag signals one after the
other). The only exception here is the activation of the solenoid valves. These
are listed in the menu in the order of their numbers. This facilitates finding each
individual valve since, as a rule, several valves must be simultaneously activat-
ed for trouble shooting.
Since the signals are assigned to their respective connections (latch groups), it
is possible at any time, by using the circuit diagram, to locate the respective
signal in the menu, even if the signal name should have changed. Within one
latch group, only one known signal suffices to find the renamed signal by
counting through the menu.
Deviations of all voltage values indicated are possible due to tolerances and
depending on the various systems.
Confirm
key