LORAD AFFINITY Series, Service Manual

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P/N 9-500-0255 4-57
Service Manual
Chapter 4: Calibrations and Performance Checks
Mechanical Adjustments
13. Press a compression down control to move the compression device down approximately
5.0 cm, then manually move it down an additional 2.0 cm. Repeat the chain tension
check in Step 10.
14. Continue moving the compression device downward, alternating between motorized
and manual movement, until the entire compression range is checked.
15. If any chain tension adjustments are required, repeat the tension check from the begin-
ning. When complete, replace the covers removed previously.
16. Install a Bucky device, a compression paddle and 5.0 cm of BR-12.
17. Use motorized compression to lower the compression paddle until it just touches the
acrylic. Use manual compression to apply 133.5 N (30 lb) of force onto the acrylic.
18. Press Reset + Comp. Release together to send the compression thickness calibration data
to the microprocessor.
19. Raise the compression paddle, remove the acrylic from the receptor support, then return
the unit to the user mode (S2 switch 1 = OFF).
8.2 Compression Display Potentiometer Adjustment
1. Ensure the timing belt is mounted on lower bearing block assembly (refer to Figure 6-
36).
2. Bring the compression device to the bottom of its travel.
3. Rotate the potentiometer in a counterclockwise direction (when viewed from the right
side of the C-Arm assembly) until it bottoms out, then make one full turn of the pot in a
clockwise direction.
4. Thread the timing belt through the pulleys, ensuring the potentiometer does not move
and the timing belt does not twist.
5. Insert the timing belt through the upper clamp block (refer to Figure 6-35). Apply Blue
Loctite 242 and tighten screws.
6. Loosen screws securing timing belt in lower clamp block. While holding on to the bot-
tom of the timing belt, raise the compression device to the top of its travel.
7. Affix the Field Service Belt Adjustment Tool (PN 9-061-0107) to the bottom of the timing
belt and loosen the screws securing the belt in the bottom clamp. Apply Blue Loctite
242 and tighten screws.
8. Manually lower the compression device until the potentiometer is aligned with the
access hole in the left C-arm side rail.
9. Insert a flat blade screwdriver through the access hole in the left C-arm side rail. Rotate
the potentiometer in a clockwise direction until it bottoms out, then make one half turn
of the pot in a counterclockwise direction.
10. Tighten clamp screw (Figure 6-37, Item 1) on potentiometer shaft at this time. Ensure
clamp screw is aligned with timing belt.
11. Perform the Compression Thickness Calibration Procedures as per Chapter 4, Section
3.2.
8.3 Compression Force Load Cell Setting
The compression force load cell is mounted in the compression device. 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 is replaced.