GE Alpha RT 32551 Installation Instructions Manual page 85

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