Troubleshooting - Danmeter CSM 2 User Manual

11 Troubleshooting

• CSM does not turn on when power key is pressed?
Change to a new battery or a fully recharged battery.
If changing the battery does not help, send the CSM for service.
• Rechargeable Battery seems to have a diminished user time
1. Turn on the monitor without patient cable and no CSM Power attached.
2. Wait until the monitor turns off (rechargeable battery discharged).
3. Connect CSM Power for minimum 4 hours to fully recharge.
• Sensor alarm – Red Error light turns on and CSI, BS and EMG replaced by -?-
Check all neuro sensors and their connections. This alarm can also be caused by
diathermy – see section 5.6.
Check the patient cable.
If not connected, then connect it.
If faulty, replace patient cable.
Check if either of the neuro sensors are disconnected or badly connected.
Replace faulty sensor
• Blanked index – but why?
Sensor impedance too high
If sensor impedance is >5kΩ the CSI, BS and EMG will be blanked (- - displayed).
Check that neuro sensors are not dry.
Check that the skin has been cleaned properly.
Clean and prep skin as described in section 3 and attach new neuro sensors.
Signal Quality Index (SQI) low
If the impedance of the white or black sensors exceeds 1kΩ, the SQI will fall gradually.
Poor impedance conditions may cause the SQI to fall to 50%.
Artifacts can have many causes: diathermy, EMG, etc. are typical causes.
If SQI falls because of extensive use of diathermy, it will rise as soon as the diathermy is
stopped.
Check that all neuro sensors and cable connections are correctly connected.
Has the use of any mechanical device that could generate high frequency activity (e.g.
patient warmer) been initiated or is any such device in close proximity to the CSM neuro
sensors?
If possible move disturbing device away from the neuro sensors.
Check grounding of disturbing device.
Reduce the influence from disturbing device by disconnecting CSM Power to let the CSM
run from the battery.
Cerebral State Monitor - CSM DFU Page 24