P- H.1.7 Isolate Card Cage - Fresenius Medical Care 2008K2 Troubleshooting Manual

P- H.1.7 ISOLATE CARD CAGE

IMPORTANT!
A) To prevent damage, turn the machine OFF!
B) Using ESD precautions, your choice, per the Board List below, swap in ONE of the card cage circuit
boards with known good, then continue to part C to test it.
BOARD LIST: 1) Actuator-Test Board; 2) Sensor Board*; 3) Functional Board*.
* To prevent "Cond Offset Failure", place the machine in T and C Mode. Refer to
MODES (page Error! Bookmark not defined.)
C) Repeat the Voltage Detection Calibration. THREE (3) possible scenarios 1) or 2) or 3) below:
1) IF "Operator Error" reoccurs: Repeat parts A through C until "Operator Error" DOES NOT
occur indicating the last board replaced was the problem. If after all boards have been swapped
in AND if "Operator Error" still occurs the motherboard may be bad.
2) IF 5V EST AND/OR 12V EST are not in range: Repeat parts A through C until 5V EST AND / OR
12V EST are in range indicating the last board replaced was the problem. If after all boards have
been swapped in AND the problem reoccurs the motherboard may be bad.
3) IF "Operator Error" did NOT occur AND 5V EST AND 12V EST are within range: The last
board swapped in was causing the problem!
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
OPERATING
Page 622