HP 750 - Manual (Page 157)

Troubleshooting C4705-90000 8-39
18. Edge Detect
The purpose of this test is to verify the operation of the line sensor.
Perform the edge detect test as follows:
1 In the Service Tests submenu, scroll to 18 Edge Detect" and press Enter.
SERVICE TESTS
18 Edge detect
2 The Y Phys Pos = ##### / Sensor Reads = ###" message is displayed on the
frontĆpanel.
3 Use the Up Arrow tomove the carriage tothe left and the Down Arrow to move the
carriage tothe right.
If the value (###) of
Sensor Reads is less than 100 when passing over the drive roller then
the line sensor has passed the test.
If the value (###) of
Sensor Reads is more than 110 when passing over the media that is
loaded then the line sensor has passed the test.
If the values (###) of
Sensor Reads is not within the above required ranges then the line
sensor has failed the test. To resolve the problem, try one of the following:
1 Clean the drive roller surface.
2 Perform the line sensor calibration ' page 7Ć5.
3 Perform the mainĆcarriage com test ' page 8Ć26.
4 Replace the carriage ' page 6Ć34.
4 Press the Enter button when the test has been completed.