GE HealthCare CONFIDENTIAL
Direction 5936427, Rev. 1 LOGIQ Totus Basic Service Manual
Chapter 7 Diagnostics/Troubleshooting 7 - 53
7-6-2 Noise picked up from the air
7-6-3 Noise received through the external cables
Electromagnetic Interference (EMI) from radio frequencies, magnetic fields, and transients in the wiring.
The noise can enter the LOGIQ Totus through the mains power cable, probe cable(s) or any other
external connected cable(s).
Disconnect cables that are not needed for the basic use of the LOGIQ Totus:
• Network cable
• Cables to any external peripherals
• ECG cables and other cables connected to the Patient I/O
Verify whether the noise changed or disappeared when the cables were removed.
Often, this type of noise is due to grounding problems in the mains power system or when the LOGIQ
Totus is sharing a power line with other equipment.
7-6-4 Doppler noise
Doppler noise symptoms can be horizontal stripes or spikes.
7-6-5 Intermittent noise
Intermittent noise can be caused by other equipment.
Table 7-20 Noise Conditions Picked Up from the Air
Symptom Cause Solution
Noise is coherent -“penlight noise”
pointing down in the picture due to the
fact that the noise is received on all
channels.
The electromagnetic
interference (EMI) from
radio frequencies,
magnetic fields, and
transients in the air.
Test whether the noise is picked up by a probe cable.
Noise is a problem on a single probe. Test with another probe.
Noise is a problem on a single probe
port.
Move the LOGIQ Totus to another location to if the noise
persists.
Table 7-21 Noise Conditions for Doppler
Symptom Cause Solution
Horizontal stripes
Typically an analog
problem caused by the
UAC-T or UCO-T
Determine if one of these boards is the cause:
• Transmit & Receive board (UAC-T)
• Probe interface board (UCO-T)
Spikes
Typically a digital
problem caused by
either the UAC-T or
UCO-T
Determine if one of these boards is the cause:
• Transmit & Receive board (UAC-T)
• Probe interface board (UCO-T)
Table 7-22 Noise Conditions for Intermittent
Symptom Solution
Intermittent noise Check equipment that is turned on and off near the scanner.
Intermittent noise present around the clock Check the clock.
Intermittent noise present at certain times
Check equipment that is turned on and off near the scanner at
certain times.
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