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Problem with HP670c vertical alignment

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by donalda-m 1 view

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I am having a problem with printing certain fonts, italics and table borders with an HP 670C running on (Windows XP Professional) that I think are related to vertical alignment.

What I have done:
1. Installed and reinstalled the printer with the XP driver, which from the info on HP's site is the only option available.

2. Performed the alignment procedure available from the Printer Properties/Advanced tab. The horizontal alignment comes out OK, but the vertical prints out a series of vertical lines that are spread all over the place.

3. Checked HP's site and performed a search from several search engines. I did just find an entry on HP's site regarding another problem I am having, indicating that the clutch actuator is disengaged. I am not at home right now, so I can't correct that, but I am wondering if the clutch actuator problem can cause alignment issues.

I've got lots of points, so I'm being generous in hopes of a quick, accurate answer. Thanks.

3 replies

by guruofdos

Common fault on 6xx series printers. The horizontal position of the print head (which is responsible for vertical alignment) is sensed by an optical sensor passing over a clear acetate tape marked with very fine black lines. This generates a series of pulses which in turn are used to determine the position of the head during printing. Sometimes the tape gets dirty and then pulses get missed. There may also be dust or debris in the optical sensor causing the same malady. One end of the tape is held in position by a hook made of spring steel and sometimes after a great deal of use, the spring loses some of it's elasticity and the tape 'bounces' as the head moves back and forth causing misalignment.

Clean the tape, and the optical pickup.Check that the tape is still under tension. This should resolve the issue.

by donalda-m

Thank you, this did help, although I also had to do a bit of home repair on the clutch actuator arm which had developed enough play to come off the cylinder occasionally

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