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Troubleshooting 4-72
NovaJet 800 Series Service Manual
Failure Analysis
1. Is the Encoder Strip clean? Has any image skewing occurred
prior to the carriage axis error? If skewing resumes following a
cleaning within a day or two then the encoder strip is damaged
and must be replaced. Normally the encoder strip cleanings
should carry the unit through 7 day/24 hour operation for a
minimum of 2 weeks without error. Refer to disassembly to
replace the encoder stabilizer bracket and the trailing cables.
Figure 4-75. Dirty or Defective Encoder Strip.
Inspect encoder strip for damage - if error occurs in one spot
consistently then the encoder strip could be damaged. Replace
the stabilizer bracket (encoder strip is pre-attached to stabilizer
bracket) and obtain a new trailing cable assembly for installation.
2. Check outrigger carriage cover bushings for visible wear and
replace outrigger bushings at 400 hours of printing operation. To
replace the cover bushings refer to disassembly procedures.
While replacing inspect and verify the internal right and left
carriage bushings are not severely worn (normally replaced at
2000 plot hours).
3. Is the Slide Shaft clean? Check with printer operator to see if
lubricants have been applied to slide shaft - no lubricants should
be applied to any part of the printer.