APX 525/625 Generator Revision C Service Adjustments
©
2005 Del Medical Imaging Corporation
7/5/2005 Page 159
Secondary Gain Adjustments
1. Select the table image receptor, 72 kV, 55 mAs. Insert 6 inches (15.24 cm) of
water (or plastic) into the field and collimator to within the attenuation material.
Insert an empty cassette in the Bucky tray. Set S.I.D. to 40 inches (1 meter).
Make an exposure. Record the mAs
2. Select the wall image receptor and recreate the above conditions. Make an
exposure. Record the mAs. If the mAs matches the mAs recorded in step 1, then
this portion of the calibration is complete. Proceed to step 4. If the mAs does not
match, then continue on to step 3
3. If the mAs is different, adjust R113 (on the Gain Adjust Board) until the mAs in
step 1 is achieved
4. If an auxiliary ion chamber is present in the system, repeat steps 1 through 3 as
required, this time adjusting R119 (on the Gain Adjust Board) to match the mAs
recorded in step 1
5. Verify the AEC performance by using film and a radiographic phantom
Back-Up Timer Test
1. Turn the generator OFF
2. Disconnect ion chamber cable from J1
3. Turn the generator ON
4. Select an appropriate receptor/chamber
5. Make an exposure at 237 mAs
6. Verify that on the console the fault indication ‘Generator Termination of AEC’ is
displayed
7. Depress the Reset button. The generator should be ready for another AEC
exposure
Maintenance
The calibration of the AEC must be checked every 6 months when the generator is
checked.
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