LORAD AFFINITY Series, Service Manual

Page: 114 / 214

4-58 P/N 9-500-0255
Service Manual
Chapter 4: Calibrations and Performance Checks
Mechanical Adjustments
If the load cell is replaced in the field, perform the following to select the type load cell
installed:
1. Set the unit for the service mode (S2 switch 1 = ON). Access Calibration Screen #3 after
power up. Highlight the Load Cell data field using the Cursor keys.
2. Press a Change key until the type load cell installed is displayed in the field. Press Reset
+ Comp. Release together to initiate the change.
3. Perform the following procedures prior to releasing the unit to the user.
• Chapter 4, Section 3.1, Compression Force Calibration
• Chapter 4, Section 3.2, Compression Thickness Calibration
8.4 C-arm Safety Microprocessor Board Calibration/Vertical Drive Force
Load Cell Setting
The type of load cell installed in the unit must be selected in calibration to ensure accurate
force sensing. The load cell type is factory set and should never be changed unless the load
cell or the C-arm Vertical Drive Actuator is replaced.
The following special equipment is required:
• Force Gauge
• StereoLoc II or equivalent weight, 35 lb
1. Turn power OFF.
2. Remove the right Gantry cover.
3. On the C-arm Safety board, jumper TP16 (TPY) to TP17 (TPX).
4. Install the 18 x 24 cm large focus aperture, and the 18 x 24 cm compression paddle.
Remove all other C-arm accessories (image receptors, magnification accessory, etc.).
5. Apply power to the unit. The C-arm Safety Microprocessor is automatically set to accept
calibration data. Verify that the CAL LED (D5) on the board illuminates.
6. When startup sequence has finished, press the “Cal Set” button (S1) on the safety board
to set the initial weight of the C-arm.
7. Install the Bucky device, then press the CAL SET switch. Remove the Bucky device.
8. Install the cassette holder and Magnification Accessory, then press the CAL SET switch.
Remove the cassette holder and Magnification accessory.
9. Remove all accessories from the C-arm. Shut the unit OFF, remove the jumper.
10. Turn power ON. Set the C-arm rotation to 0°.
11. Place a cushioned chair under the C-arm and place a scale (bathroom type) on top of the
chair. Slowly move the C-arm down onto the scale and verify that motion stops at
approximately 154 N, +44 N (35 lb, ±10 lb) (C-arm safety error alarm will sound).
12. Raise the C-arm and then reset the Alarm Code 6 “CARM SAFETY” on the control panel.
13. Repeat Steps 11 and 12 with the C-arm rotated to ± 90°.
14. If the force gauge readings are not within the range specified, 154 N, +44 N (35 lb, +10
lb), there is a problem with either the C-arm Safety board or the force load cell. Trouble-
shoot as necessary.