Wd- 1.0.4 Check For Power Control Board 'Short'; Wd- 1.0.5 Isolate Power Supply/Card Cage - Fresenius Medical Care 2008K2 Troubleshooting Manual

WD- 1.0.4 CHECK FOR POWER CONTROL BOARD 'SHORT'

Turn the machine ON. TWO (2) possible scenarios:
1)
IF (and ONLY if) "WD: Fail Long Pulse" OR "WD: Fail Short Pulse" does NOT reoccur: Turn the
machine off and on several times, allowing 40 seconds in between, If "WD: Fail Long Pulse" OR "WD:
Fail Short Pulse" does NOT reoccur the new IC4 fixed the problem!
2) IF "WD: Fail Long Pulse" OR "WD: Fail Short Pulse" REOCCURS: See procedure number
WD- 1.0.5 (page 574).
WD- 1.0.5 ISOLATE POWER SUPPLY / CARD CAGE
IMPORTANT!
a) ENSURE the "WD: Fail Long Pulse" OR "WD: Fail Short Pulse" banner is up
BEFORE continuing to part b.
b) Per the Figure below, measure again at the TEST Connector's,
1) IF (and ONLY if) more than 3 volts DC: Assuming all above procedures were performed
correctly, there may be a 24 volt 'short circuit' inside the power supply or the card cage. See
procedure number
2) IF less than 3 volts DC: The symptom changed from what originally brought you here. It appears
the new IC4 is working. Return to (ABOVE) procedure number
voltage and proceed as directed.
WD- 1.0.6 (page 575).
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
pin 8
. TWO (2) possible scenarios:
WD- 1.0.0 (page 571) to re-measure
Page 574