Error Message:

HEAD: Focus sensor fails linearity test, check head position

Applies to:

• Thermal

Service Information:

Should only occur in response to a "focus cal" command. Verify that the head is properly installed and that head is in front of media. It is possible to do just the error calibration part of focus cal using the "focus cal error" command. If after proper head install this error persist then put back the factory setting for head ferrcal since it may be possible to image regardless of this error.

When doing a head install it is very important that the media thickness be correct. Verify that media thk and media cthk are as expected and that right media setting is enabled with the mode media command.

Operator Action:

Call service.

Cause:

• The measured focus error as the final lens is moved is not a nice straight line. Most likely head is not installed properly in front of media.

See Also:

• Command: focus cal
• Command: head install
• Command: mode media
• NVS: head ferrcal
• NVS: media thk
• NVS: media cthk