Noise In Doppler Mode; Excessive Noise Lines When The Cursor Is Placed Straight Down - GE LOGIQ E9 Service Manual
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- Service manual (808 pages) ,
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D
5180483-100, R
IRECTION
7-9-3-5
Noise in Doppler Mode
Typical noise problems:
•
Horizontal lines.
Usually the noise is only picked up when coupling the probe to your body.
Table 7-49
STEP
1
2
3
4
5
6
7
7-9-3-6
Excessive Noise Lines when the cursor is placed straight down
Table 7-50
STEP
1
PROPRIETARY TO GE
. 7
EV
Noise in Doppler Mode
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 video cables:
Wind the cable twice through a split ferrite, GE Part Number 038X1012 / 038X1112.
•
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).
•
Adjust Acoustic Power a few dB down in order to determine if the noise is coming from th e Main Power Supply,
If the noise disappears, the source is the main Power Supply.
Other possible internal noise sources:
•
Main Power Supply
•
Peripherals.
•
Disconnect devices from the USB ports on the Op
Excessive noise lines when the cursor is placed straight down
•
Verify that the shielding is connected to Ground on the Patient I/O Cable(s).
Chapter 7 Diagnostics/Troubleshooting
TASK
4.
TASK
LOGIQ E9 P
ROPRIETARY
S
M
ERVICE
ANUAL
7 - 201
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Troubleshooting
