Noise Troubleshooting; Purpose Of This Section; Contents In This Section; Introduction - GE Venue R1 Service Manual

P R E L I M I N A R Y
D 5771498-100, R
IRECTION
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:
• EMI Limitations
• EMI Prevention/Abatement
• Overview of Types of Noise
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.
6
EVISION
- see below
Chapter 7 - Diagnostics/Troubleshooting
V ™ S M
ENUE ERVICE ANUAL
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