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initialization. 
2. If the problem persists, replace the 
BIS module. 
3. If the problem persists, check the 
connection cable between the 
backplane and the display. 
4. If the problem persists, replace the 
module rack (refer to 11.1.14). 
5. If the problem persists, replace the 
cable between the backplane and 
BIS Comm Abnormal  High 
No waveform data 
packet is received for 
consecutive 2s, or no 
data packet of BIS 
monitored parameters is 
received for consecutive 
4s. 
1. Re-plug the BIS module, or replace 
the slot. 
2. If the problem persists, replace the 
BIS module. 
3. If the problem persists, check the 
connection cable between the 
backplane and the display. 
4. If the problem persists, replace the 
module rack (refer to 11.1.14). 
5. If the problem persists, replace the 
cable between the backplane and 
Low 
exceeds the 
measurement range of 
Replace the BIS module. 
BIS R Over Range 
BIS High Imped.  Low 
properly adhered to the 
patient skin. The 
1. Check the contact between the BIS 
sensor and the patient skin. 
2. If the problem persists, replace the 
BIS Sensor Off  Low 
The sensor falls off from 
the patient. 
1. Check the contact between the BIS 
sensor and the patient skin. 
2. If the problem persists, replace the 
BIS Electrode 1 High 
Imped. 
Low 
The impedance of BIS 
electrode 1 is too high. 
1. Check the contact between BIS 
sensor electrode 1 and the patient skin. 
2. If the problem persists, replace the 
BIS Electrode 1 Lead 
Off 
Low 
BIS electrode 1 falls off 
from the patient. 
1. Check the contact between BIS 
sensor electrode 1 and the patient skin. 
2. If the problem persists, replace the 
BIS Electrode 2 High 
Imped. 
Low 
The impedance of BIS 
electrode 2 is too high. 
1. Check the contact between BIS 
sensor electrode 2 and the patient skin. 
2. Replace the BIS sensor. 
BIS Electrode 2 Lead 
Off 
Low 
BIS electrode 2 falls off 
from the patient. 
1. Check the contact between BIS 
sensor electrode 2 and the patient skin. 
2. If the problem persists, replace the 
BIS Electrode 3 High 
Imped. 
Low 
The impedance of BIS 
electrode 3 is too high. 
1. Check the contact between BIS 
sensor electrode 3 and the patient skin. 
2. If the problem persists, replace the