Fresenius Medical Care 4008 E Technical Manual page 48

F13 UF-Function
F14 UF-Function
F15 UF-Function
F16 UF-Function
F09 UF-Function
F17 UF-Function
F20 UF-Function
F95 UF-Function
The pulse time for the UF pump 2 is longer than 500 ms. A maximum
rate of 5000 ml/h is not possible.
– The monoflop on P.C.B. LP 634 is defective (IC42/R65/C45).
No activity of the UF pump 2 during the test (4 sec).
– Acknowledgement (UF_P2, X637/B26) → X632/C7, no LOW puls-
es.
– Control line (UF_P2, X634L/ABC24) → X637/B26, no LOW pulses.
The UF pump 2 cannot be stopped by CPU2.
– Control line (UF_P_EN, X632/C28) → X634R/A22, 5 V are missing.
– The reset input at IC42/pin 13 on P.C.B. LP 634 is defective.
The UF pump acknowledgement of CPU1 is defective.
– Acknowledgement (UF_P2, X637/B26) → X633L/C23, no LOW
pulses.
Dialysate pressure is outside the measuring range (15s).
– UF pressure transducer defective
– D/A converter (IC11) on P.C.B. LP 632 defective
– Operational amplifier (IC1/IC3) on P.C.B. LP 632 defective
The change in pressure after a stroke of the UF pump 2 is less than 20
mmHg.
– The UF pump 2 is mechanically defective.
– Control line (UF_P2_CTL, X632/B24) → X634R/C11, no HIGH
pulse.
The difference in volume between UF pump 1 and UF pump 2 is higher
than 25% (range of tolerance 15% to 35%).
– The stroke volume of UF pump 1 or UF pump 2 has been misadjust-
ed.
System error.
Fresenius Medical Care 4008 4/08.03 (TM)
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