GE M
EDICAL
S
YSTEMS
D
IRECTION
FC091194, R
EVISION
02
V
IVID
7 / V
IVID
7 PRO S
ERVICE
M
ANUAL
7 - 66
Section 7-4 - Acquisition Diagnostics
7-4-5-2 Front End Alignment Procedure (cont’d)
Front End Alignment Description
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Each A/D converter will get 0V input (by setting ATGC to minimum).
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One by one channel will be digitized and the result put in the IQ buffer on the RFT board.
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The BEP will then read the IQ buffer and computes a value per channel. These computed
values are compared to an upper/lower limit.
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If all read values are ok, the message PASSED will appear. If values exceeding the limits are
read, the system will prompt you with FAILED and a message will tell you which BF board is
bad.
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The resulting offsets for each channel are stored in a file on the Backend Processor’s hard
disk.
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The values can be plotted in a diagram (click SHOW GRAPH).
6.) Always reboot the scanner after Front End Alignment is finished and verify proper operation.
NOTE:
Do Not select “Cal Reset” after performing calibration. This will destroy the file located on the
Backend Processor and the image quality will not be optimized.
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