Noise In Color Flow - GE LOGIQ E9 Service Manual

D 5180483-100, R
IRECTION
7-9-3-4

Noise in Color Flow

Typical noise problems:
• coherent noise patterns straight down in the image field.
• flashes of noise straight down.
Usually the noise is only picked up when coupling the probe to your body.
Table 7-48
STEP
1
2
3
4
5
6
7 - 200
PROPRIETARY TO GE
. 7
EV
Noise in Color Flow
Try another probe (same model). Does it help?
• If Yes, replace the original probe.
• If No, continue with the next step.
Disconnect all probes that are not in use. Keep only the active probe connected. Does it help?
• If Yes: The noise is most likely from an external source. If possible, try to locate and remove the source.
• If No, continue with the next step.
Disconnect all external cables from the I/O (on the rear side of LOGIQ E9) and from the Patient I/O, to establish
whether the noise is due to interference from external devices. Does it help?
• If Yes, continue with step
• If No, continue with step 5.
There are possible ferrite solutions to most of the cable connections.
• On USB cables:
Wind the cable 5-6 times trough a ferrite ring, GE Part Number 038X0028.
• Verify that the shielding is connected to Ground on the Patient I/O Cable(s)
Do the DC Offset Calibration, see:
Other possible internal noise sources:
• Main Power Supply,
• Peripherals
• Disconnect devices from the USB ports on the Op.
Section 7-9 - Troubleshooting Tips
TASK
4.
Section 6-6 "DC Offset Calibration" on page
LOGIQ E9 P
ROPRIETARY
6-34.
S M
ERVICE ANUAL