Philips CARDIOMD Service Manual page 173

Procedure
7. Remove the rubber seal from the faulty
PMT.
8. Grasp the glass neck of the faulty PMT
and pull carefully away from the crystal,
turning the PMT slightly back and forth.
A slight tilt force at the same time is helpful.
After a while the PMT will come loose.
9. Lift the PMT out.
10. Use a plastic spatula, for example a plastic
ruler, to wipe the old coupling compound
away from the crystal surface.
11. Check that the face plate of the
replacement PMT is clean. Press approx.
1 cm (3/16") strip of optical couplant onto
the center of the PMT face plate. Be
careful that no air bubbles are trapped in
the couplant.
12. Use the plastic spatula (ruler) to smear out
part of the blob towards each of the
corners of the PMT face plate. Ensure that
the layer is still thickest around the center.
13. Rotate the PMT to position the connector
consistently with the other PMT's. Align
the PMT and press down to seat the PMT
on the face of the crystal. Apply pressure
to such an extent that excess couplant
appears around all four edges.
14. Remount the rubber seal.
15. Remount the detector by reversing the
procedure described above.
16. Before remounting the lead covers, power
up the system and run a few iterations of
PMT update calibration. See the
CardioMD Operator's Manual Chapter 5
Maintenance for instructions.
17. Assess the images to see if the new PMT
matches the rest of the PMT's.
If the new PMT shows a pronounced pattern,
1MAN0158-H11 04-2005 CSIP Level 1
Details
Repair Procedures
CardioMD Service Manual 6-9