Corrosion On Contact Prints; Checking Pressure On Contact Balls - Philips CARDIOMD Service Manual

False Collisions
5.5.1.3

Corrosion on Contact Prints

If disabling the detector collision sensors one by one does not yield a solution to the problem of
false collisions, the cause may reside in corrosion around the small steel balls on either the
detector ID board or the collimator ID board.
Proceed as follows:
Procedure
1. Try cleaning the contact balls with
alcohol.
If this does not solve the problem, the springs
behind the contact balls may be corroded. See
photo on the right. In this case:
2. Replace the detector ID board and/or the
collimator ID board.
The mechanical replacement of either board is
straightforward.
When the collimator ID board has been
replaced, the new ID board must be
programmed with collimator type information.
See instructions in Chapter 7 Software Update
Procedures, the section Collimator ID
Programming.
5.5.1.4

Checking Pressure on Contact Balls

When electrical causes for false collisions have been ruled out (by following instructions given in
the previous sections), you should check whether the adjustment of collimator locks could be the
cause.
Procedure
Measure the distance between the collimator
ID board and detector ID board when the
contact balls are just touching each other.
1. Remove the detector side cover.
2. Remove the detector edge cover.
3. While sliding in the collimator, hold a
small piece of paper between the boards
until the paper is just caught between the
contact balls.
5-22 CardioMD Service Manual
Details
Details
1MAN0158-H11 04-2005 CSIP Level 1