GE GA000100, Service Manual

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GE H
EALTHCARE
D
IRECTION
GA091568, R
EVISION
5 VIVID E9 S
ERVICE
M
ANUAL
Chapter 6 - Service adjustments 6 - 11
Section 6-6
DC Offset Calibration (Front End Alignment)
6-6-1 Introduction
DC Offset Calibration (Front End Alignment) is performed to calibrate each ADC channel of the GRX
inputs. The system calibrates the ADC to zero output when there is no signal on the input. These bias
voltages are stored in the Back End Processor.
6-6-2 When to do a Front End Alignment
Do the Front End Alignment:
• when installing a new VIVID E9
• after software has been updated or replaced
• when DRX boards have been interchanged
• when a DRX board has been replaced
• when the Back End Processor has been replaced
6-6-3 Front End Alignment Procedure
The Front End Alignment is available on the Common Service Desktop interface.
1.) Disconnect all probes.
2.) Power on the VIVID E9.
3.) Select the InSite ExC icon (GE phone icon) on the screen to display the InSite ExC menu.
4.) Select Service Desktop.
5.) Select the Diagnostics tab.
6.) Open the Analog Receive folder.
7.) Select Execute to run the calibration.
8.) After completing the calibration, restart the VIVID E9.
Figure 6-10 InSite ExC icon in the status bar
Figure 6-11 InSite ExC Menu