MPS450 SERVICE MANUAL TROUBLESHOOTING
26
TROUBLESHOOTING TIPS
FUNCTION: ECG
Symptom: The amplitude for Lead II is not correct.
Suggestion 1: The problem may be related to the monitor filters. Note that there will be a slight
loss of amplitude when simulating normal sinus rhythm. Use a pulse wave to verify
the amplitude more accurately.
Suggestion 2: The lead setting on the monitor may be incorrect. Check the monitor lead-select
switch to ensure that it is set to Lead II.
Suggestion 3: The leads may not be connected properly. Check the connections to the color-coded
ECG jacks.
FUNCTION: BLOOD PRESSURE
Symptom: There is no blood-pressure reading, or the reading is not as expected.
Suggestion 1:
The MPS450 transducer sensitivity may not be set correctly. Check the monitor
manufacturer’s BP-sensitivity requirements. Reset the MPS450 either to
5
µV/V/mmHg or to 40 µV/V/mmHg.
Suggestion 2: An incorrect blood-pressure cable may be in use. Note that many manufacturers use
plugs and/or configurations with wiring differences. Check the MPS450 BP-wiring
diagram, and compare it with the monitor specification.
Suggestion 3:
The monitor may not be zeroed. Zero the MPS450 BP channel. Then, zero the
monitor.
Suggestion 4: The monitor sensitivity (scaling) may not be correct. Adjust scaling on the monitor,
near the range simulated (e.g., 120 mmHg, etc.).
Suggestion 5: The performance waveform may be output currently, which turns off blood pressure.
Select the normal physiological waveform.
FUNCTION: RESPIRATION
Symptom: There is no respiration signal.
Suggestion 1: The correct respiration lead may not be selected. Check the respiration-lead
detection on the monitor, and switch accordingly on the MPS450.
Suggestion 2: The leads may not be connected properly. Verify that the color code is correct for
U.S. or International ECG leads.
Suggestion 3: The performance waveform may be output currently, which turns off respiration.
Select the normal physiological waveform.
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