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IRECTION 5771498-100, REVISION 6 VENUE™ SERVICE MANUAL

Chapter 7 - Diagnostics/Troubleshooting 7-9

PRELIMINARY

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 - 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.

GE Venue R1 Service Manual

Questions and Answers: