P- H.4.6 Between 23.0 And 28.0 Volts/Monitor 24 Volts; P- H.4.7.1 Unstable Or 24V Or Failed Sending Reoccurs - Fresenius Medical Care 2008K2 Troubleshooting Manual

P- H.4.6 BETWEEN 23.0 AND 28.0 VOLTS / MONITOR 24 VOLTS
a) With the "Select Program" banner up select the screen's 'Dialysis' button but
yet!
b) Call debug screen 10. Figure right, 24V is the 'real time' reading from
the +24 volt supply. HI and LO 'records' the highest and lowest
starting one (1) minute after the machine is turned on.
c) At the bottom of the screen, select the 'Dialysate' tab THEN press 'CONFIRM' to return to Dialysis
Program!
d) Call debug screen 10 and allow one (1) minute for the 24V window to update. The 24V window IS
NORMALLY UNSTABLE however, an alarm does not occur unless if it falls below 22.8 volts ("24V Low")
or rises above 28.0 volts ("24V High") for several seconds.
e) WITHOUT LOOKING AWAY, watch the volt meter for ten (10) minutes. Does the measurement become
unstable (i.e. changes more than +/- 0.5) OR does a "24V" OR "Failed Sending Data To Actuator Board"
alarm occur?
Yes Measurement became unstable AND / OR "24V" OR "Failed Sending Data..." reoccurs!
See procedure number
No Measurement remains stable AND a "24V" OR "Failed Sending Data To Actuator Board"
alarm reoccurs! Proceed to

P- H.4.7.1 UNSTABLE OR 24V OR FAILED SENDING REOCCURS

Based on the MEASURED voltage, TWO (2) possible scenarios:
1) IF MEASURED voltage became UNSTABLE: Proceed to
2) IF MEASURED voltage remained STABLE: Perform parts a through c below:
a) Place the machine into Service Mode → Options → Hardware Options.
b) Next to T and C Mode place the 'X' in the "Yes" box and press the
'CONFIRM' key. The 'X' MUST turn blue!
c) One at a time, starting with the Actuator-Test Board, swap in the card cage circuit boards, with
known good then, in between, return to (ABOVE) procedure number
each new board.
P- H.4.7.1 (page 626).
page 627
, procedure number
2008K/K2 Troubleshooting Guide
P/N 507298 Rev. H
DO NOT
P- H.4.8.2.
page 649
, procedure number
page 626)
P- H.4.6 (
press CONFIRM
P- 4.0.0.
to test
Page 626