2008T Troubleshooting Guide
P/N 490292 Rev. A
AUTOTEST- 7.0.0 ISOLATE ACTUATOR-TEST BOARD / VALVES(S)
TWO (2) possibilities: 1) Bad Actuator-Test Board OR; 2) Bad valve(s) i.e. mechanically ‘stuck open’.
a) Turn the machine off and swap in a known good Actuator-Test Board (see Figure 4A, page 10).
b) Repeat the Diagnostic Valve Leak Test on the leaking valve(s). TWO (2) possible scenarios:
1) IF passes: The previous Actuator-Test Board is bad
2) IF fails: Replace the leaking valve(s). To LOCATE the valve refer to Figure 96 (page 579). NOTE!
The previous Actuator-Test Board is probably good!
Diagnostic Valve Leak Tests Theory: These Tests isolate two ‘systems’: System #1) During the “IOS” Test,
Air Removal Chamber #69 (IOS) and System #2) Valves for potential leaks to atmosphere:
a) Pressure is monitored by Dialysate Pressure Sensor #9.
b) Pressures are achieved during each “Prep” phase using either the UF Pump to achieve negative pressure
or Loading Pressure to achieve positive pressure. Refer to the Table below.
c) During IOS all valves are closed which isolates Chamber #69 for a leak. IOS MUST pass to ensure the
valve leak tests are valid. If it fails all valves may fail
d) During each “Testing” phase the tested valve is closed and an alternate path to atmosphere is open for
thirty (30) seconds. If the valve is truly closed pressure holds (+/- 25 mmHg) for thirty (30) seconds and
the valve passes.
Leak Test Pressures
Tests Requiring Negative
Pressure (approx. -300 mmHg)
Tests Requiring Positive
Pressure (approx. +300 mmHg)
Valve #43 IOS
Valve #31 Valve #32
Valve #33 Valve #34
Valve #35 Valve #36
Valve #37 Valve #38
Valve #26 Valve #29
Valve #24 -----------
Valve #25 -----------
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