Removing The Covers From The Collimator - GE Compax 40E System Service Manual

GE HEALTHCARE
REV 9
> Torque screwdriver (for torquing the set screws): torque of 1.4 Nm (12 in lbs.)
2-8-2

Removing the Covers from the Collimator

The following identifies the collimator covers and the steps required for disassembling.
− Main cover
a. Remove the rear lid
b. Disconnect the ground cable
c. Remove the six securing screws and remove the main cover
− Internal cover
a. Remove the five screws and remove the internal cover
− Front panel
a. Remove the knobs
b. Loosen the two screws and open the front panel
c. Disconnect the ground cable
d. Disconnect connectors PR1A and PR2
e. Remove the front panel
2-8-3 Lubrication
Apply a light coating of Lubriplate 630−AA or equivalent to the following parts:
− Worm screws, which are coupled to motor M2 and M1
− Clutch − Do not loosen the clutch; apply grease to its outer surface and to the clutch for motor M1
and M2.
− Blade pivot points − Lubricate all pivot points (14 points total)
2-8-4 Collimator General Inspection
Note: Take extra care when cleaning the window and mirror, as the surfaces can easily be scratched.
1. Light field quality is affected by dust build−up or smudges on the window or mirror. Check for grime
on the inner and outer surfaces of the window. Clean with X−ray screen cleaner.
2. Carefully clean the mirror with a soft cloth moistened in a mild soap and water solution. Wipe dry
using another soft, dry cloth. (A commercial glass cleaner can also be used to clean the mirror.)
2-8-5 Check Tightness of Collimator Mounting Ring (every 12 months)
If the collimator has play, you must remount it. Use the following steps to remount the collimator.
1. Rotate tube/collimator assembly to bring the collimator bottom up
2. Disconnect the cables at the back of the collimator
3. Remove the blocking screws (dowels) and unscrew the mounting ring
4. Remove the collimator from the interface plate.
5. Put it on the table top, taking care to not scratch the top surface.
6. Reassemble all parts following the installation procedure in "Section 3" of this chapter.
Pay particular attention to foreign particles or chips that could prevent the ring or dowels being correctly
tightened.
System Service Manual − SYSTEM COMPAX 40E, CE Marked
with MPH 50/65/80 (including XT, RS 85 and Tomo−Link)
97
DIRECTION 2154260−100