P- G.5.9 Symptom Still Present - Fresenius Medical Care 2008K2 Troubleshooting Manual

P- G.5.9 SYMPTOM STILL PRESENT

To prevent damage turn the machine OFF!
A)
B) Reconnect the Actuator ribbon cable to to the Actuator-Test board
C) Using ESD precautions, per the Board List below, your choice swap in ONE of the card cage circuit
boards with known good, then in between see part D to test the board.
BOARD LIST: 1) Actuator-Test Board; 2) Sensor Board; 3) Functional Board
1
To prevent "Cond Offset Failure", place the machine in T and C Mode Refer to
MODES (page Error! Bookmark not defined.).
D) Turn the machine on (fan running)!
E) If possible, place it into Dialysis OR Heat Disinfect.
ENSURE the black lead remains connected to chassis ground!
F)
G) Per the ORIGINAL symptom, THREE (3) possible scenarios below:
1) IF (and ONLY if) the screen was not turning on but is now: The last board swapped in is the
problem!
2) IF (and ONLY if) the screen was remaining black and still is black: Return to part a HOWEVER,
if after ALL boards have been replaced AND the screen remains black possible bad: 1) Distribution
board OR; 2) Bad motherboard.
3) IF the screen has ALWAYS been on: Allow sufficient time for the symptom to reoccur then see
part H.
H) Re-measure +12 and / or +5 volts (within range now?). If the symptom was intermittent call debug
screen 1 to watch 5V Est and / or 12V Est. Allowing sufficient time, does the symptom you were
troubleshooting reoccur?
Yes Symptom reoccurs! Repeat parts C through H until each circuit board in the BOARD LIST
have been replaced. If after ALL boards have been replaced AND the symptom is still
present possible bad: 1) Distribution board OR; 2) Motherboard.
No Screen on and/or good voltages! The last board replaced may be causing the problem.
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
1
.
OPERATING
Page 616