False Collisions; Locating The Cause Of A False Collision - Philips CARDIOMD Service Manual

5.5 False Collisions

5.5.1

Locating the Cause of a False Collision

Under normal operation, the CardioMD system detects a collision by performing a logical OR
operation on the input signals from the individual collision sensors. These sensors include:
•
Collimator surface sensor, detector I
•
Collimator surface sensor, detector II
•
Detector edge sensor, detector I
•
Detector edge sensor, detector II
•
Detector end cover sensor, detector I
•
Detector end cover sensor, detector II
•
Detector top cover sensor
•
Rotate gear cover sensor.
To locate a cause of a false collision, it is practical to disable the sensors one by one in order to
determine whether one of the sensors is causing the problems.
Note. The collision circuit will report a collision when it detects:
•
An open circuit
•
A short-circuit.
All sensors must have a resistance of approximately 20 kΩ in the non-collision state.
1MAN0158-H11 04-2005 CSIP Level 1
Diagnostics
CardioMD Service Manual 5-19