HP 750c Service Manual - Page 170

Pinchwheel Sensor

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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 PinchĆarm assembly ' 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. 8-52 Troubleshooting C4705-90000

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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
PinchĆarm assembly
'
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.