Fresenius Medical Care 2008K Troubleshooting Manual page 152

CO- 8.0.5 ISOLATE ACTUATOR BOARD
a) Leaving the blue wire harness plugged in (see Figure right),
measure DC voltage ACROSS valve #29's METAL solenoid
terminals.
b) NOTE! A reading like 24
0.024
( volts)!
c) Less than 2 V (volts) DC?
Yes Replace valve #29 (leaking).
No Replace the actuator board (see
CO- 8.0.6 CHECK PUMP VOLUMES
a) Referring to Figure 59
and/or bicarbonate delivery) 6 psi check valves (P/N 150209, with white inserts) AND they were
replaced recently perform a couple of heat disinfects then check Conductivity again. This is especially
important if Conductivity was okay prior to replacing the check valves!
b) Do NOT enter Service Mode. These checks are performed in Dialysis program to verify 2% accuracy.
c) IMPORTANT! Assure the concentrate inlet tubing is fully primed. Longer tubing requires extended
priming!
d) Check ACID and BICARB PUMP VOLUMES per
Preventative Maintenance Procedures.
CAREFULLY watch the burette! Even, constant
volume should be drawn during EACH cycle (see
Figure right)! If (and ONLY if) they do not draw
evenly see procedure number
139).
e) From debug screen 1, does the acid pump draw
between AMIN and AMAX AND the bicarbonate
pump between BMIN and BMAX?
Figure 61 – Valve #29 Check
mV
is 24 millivolts
Figure
(page 141), if (and ONLY if) the machine is equipped with the SDS (central acid
CO- 4.1.0 (page
Fresenius 2008K Troubleshooting Guide
P/N 507298 Rev. B (Draft 1)
Section 5 – Conductivity/ On Line Clearance Problems
4A, page 8).
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