Fresenius Medical Care 4008 E Technical Manual page 44

F12 pos. Pressure
F13 pos. Pressure
F14 pos. Pressure
F15 pos. Pressure
F16 pos. Pressure
F17 pos. Pressure
F18 pos. Pressure
F19 pos. Pressure
The loading pressure cannot be measured via the solenoid valves V24
and V24B in the hydraulic system (P-Dial. < 600 mmHg, 15 sec).
– Solenoid valve V24 or V24B mechanically not open.
The balancing chamber is switched to passage during this test sequence. V43 and V26
are closed; V24 and V24B are open.
The hydraulic system cannot be deaerated via the solenoid valve V43
(P-Dial. not equal to –125 to 55 mmHg, 20 sec).
– The solenoid valve V24 is not closed.
– V43 neither opens electrically nor mechanically.
The balancing chamber is switched to passage during this test sequence. V24 and V26
are closed; V24B and V43 are open.
Zero point change after closing of solenoid valve V43 (20 sec).
Standard: P-Dial. not equal to –125 to 55 mmHg.
HDF option: P-Dial. not equal to –125 to 60 mmHg.
– The solenoid valve V24 is not closed.
The balancing chamber is switched to passage during this test sequence. V24, V26 and
V43 are closed; V24B is open.
The loading pressure is below 780 mmHg ±30 mmHg (10 sec).
– The loading pressure is too low.
During the start phase, the pressure dropped below 620 mmHg (meas-
uring tolerance: ±30 mmHg, max. test running time 120 sec).
– Major leakage in the hydraulic system.
– The UF pump spring is defective.
– The loading pressure is too low.
– The air separation pump fails to occlude.
– Relief valve is leaking.
During the start phase, it was not possible to reduce the dialysate
pressure to a value below 760 mmHg (measuring tolerance:
±30 mmHg, test running time 120 sec).
– The loading pressure is too high.
– The UF pump is defective.
The working point (116 digits) of the differential amplifier cannot be set
correctly (test running time 120 sec).
– The pressure variations in the system are too large.
Completion of the pressure measurement was not possible (max. test
running time 120 sec).
– The D-A converter (IC11) on P.C.B. LP 632 is defective.
– The acknowledgement (P_DIAL, X633L/B6) → X632/A29 is defec-
tive.
Fresenius Medical Care 4008 4/08.03 (TM)
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