Philips CARDIOMD Service Manual page 368

Detailed Description
The lever shown at the bottom left in Figure 12.17 activates the shutter. The shutter is spring-
loaded, which means that it defaults to the closed position in case of a power loss or an error
condition.
Figure 12.18 Shutter operating mechanism outside line source housing
As shown in Figure 12.18, the line source compartment contains a solenoid. When the solenoid is
activated electrically, it moves the actuator bracket, which rests on a slide bearing. The actuator
bracket, in its turn, moves the shutter indicator / manual knob out. At the same time, the locking
plate is lifted and its built-in groove activates the shutter lever on the line source housing (see
Figure 12.17), thereby causing the shutter to open. The groove in the locking plate runs the entire
length of the line source housing's trajectory, thus ensuring that the shutter can be operated
regardless of the position of the line source housing.
The position of the shutter is sensed by an optocoupler as shown in Figure 12.19.
12-20 CardioMD Service Manual
WARNING
The line source housing must not be taken apart. Figure 12.17 only serves to
clarify the explanation.
Solenoid operating
shutter
Shutter open Shutter closed
Shutter indicator
and manual lever
Locking plate
for shutter
Groove for
activating shutter
Actuator bracket
1MAN0158-H11 04-2005 CSIP Level 1