HP 750 - Manual (Page 170)

8-52 Troubleshooting C4705-90000
31. Pinchwheel Sensor
The purpose of this test is to verify the operation of the pinchwheel sensor.
Perform the pinchwheel sensor test as follows:
1 In the Service Tests submenu, scroll to 31 Pinchwheel Sensor" and press Enter.
SERVICE TESTS
31 Pinchwheel sensor
2 If the pinchwheel lever is lowered then the Pinchwheels Down / Stop..." message is
displayed on the frontĆpanel. Press the Down Arrow button to stop the test.
3 If the pinchwheel lever is raised then the Pinchwheels Up / Stop..." message is displayed
on the frontĆpanel. Press the Down Arrow button to stop the test.
If the pinchwheel lever is raised when the Pinchwheel Down / Stop..." message is
displayed on the frontĆpanel, then the test has failed.
If the pinchwheel lever is lowered when the Pinchwheel Up / Stop..." message is
displayed on the frontĆpanel, then the test has failed.
If the test fails,
try replacing one of the following components:
1 Pinchwheel sensor ' page 6Ć21.
2 PinchĆarmassembly ' page 6Ć57.
3 Main PCA ' page 6Ć9.
Only replace one component at a time and perform the “Pinchwheel Sensor” test again before
replacing another component. Using this procedure you will be able to determine exactly which
component failed.