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IRECTION
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V
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ERVICE
M
ANUAL
Chapter 7 - Diagnostics/Troubleshooting
7-9
P R E L I M I N A R Y
Section 7-5
Noise Troubleshooting
7-5-1
Purpose of this Section
In this section you will find Noise troubleshooting procedures and hints.
7-5-2
Contents in this Section
Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-43
Overview of Types of Noise . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-43
Different Power Outlet . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-45
Different System. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-45
Different Location . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-45
Disconnect External Cables . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7-45
7-5-3
Introduction
Before you start troubleshooting the noise, you should read the following subsections:
•
•
•
- see below
When talking to the customer, try to gather as much information as possible about the conditions when
the noise appear:
Is the noise present...
… all the time?
… after some time of use? (After how long time?)
… at special times of the day (or night)? When?
… at all locations in the hospital, or only in one room/area?
… from time to time, no special pattern of time is observed?
7-5-4
Overview of Types of Noise
There are different types of noise. Use the information next to classify the noise and possible cause.
7-5-4-1
Noise Picked Up from the Air
Electromagnetic Interference (EMI) from radio frequencies, magnetic fields, and transients in the air.
If picked up by a probe cable, the noise will be coherent -“penlight noise” pointing down in the picture -
due to the fact that the noise is received on all channels.
•
Is it a problem on one probe only?
Try another probe.
•
Is it a problem on one of the probe connectors only?
Move the scanner to another location and verify any changes.
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