Printronix L1024, Maintenance Manual

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13–42 Chapter 13 – Troubleshooting Guide
TOF REGISTRATION ERRORS
1. The positioning of the tractor encoder is incorrect.
a. Check the mounting bracket for the encoder board on the tractor frame. Make sure the
bracket is not loose and that the encoder board is also securely fastened to the
bracket.
b. The position of the first line of print can be adjusted by raising or lowering the encoder
mounting bracket on the tractor frame.
2. The printer “thinks” that TOF is set, but it is not. This will be evident by the ready light being
illuminated and the paper not being in the fuser. The printer starts a print job and feeds paper
into the fuser. The first line of print will be about midway down the page.
a. The plastic TOF lever (flag assembly) is stuck in the depressed position. Clear the
lever and make sure there are no damaged parts.
b. The TOF optical sensor is faulty and the entire fuser sensor board must be replaced.
c. The cable for the TOF sensor board is faulty and must be replaced.
d. The Engine Controller Board is faulty and must be replaced.