GE Alpha RT 32551, Installation Instructions Manual

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5 Setups, alignments and adjustments
32551-IMG rev 6 GE Healthcare 79
AEC adjustment quick fix guide
Problem Probable
Reason
Action Comments
No contrast
with large
breasts. Full AEC kVs with
large breasts too
high. Increase the Target time
with large breast thickness.
(Pr# 65 tAr program).
Results in
lower kV with
large breasts.
No contrast
with small
breasts. Full AEC kVs with
small breasts too
high. Increase the Target time
with small breast thickness.
(Pr# 65 tAr program).
Results in
lower kV with
small breasts.
mAs too high,
long exposure
times. Full AEC kVs low. Decrease the Target time
values.
Low kVs yield
long mAs.
O.fl errors or
“white images”. Start kV too low
and/or maximum
allowable kV
change too small. Change the full AEC kV
table (Pr# 64 AEC
parameter E) or Increase
the kV change value (Pr
mode).
EAf errors. Poor connection
between CPU and
AEC boards.
Incorrectly
adjusted AEC offset
voltages. Check the cabling. Adjust
the AEC board offset
voltages.
EAf error at
start up. AEC board supply
voltages problems
or autozeroing
circuit does not
work at start up. Check the AEC board supply
voltages. If you are using
the 32315 AEC board with
software 7.27 or later, you
can remove the capacitor
C35 (22µF).
“white images”. O.fl, U.fl or C.cn
error code. Check the bucky
connection (apply
compression).
Table 5.7 AEC adjustment quick fix guide