HP 450c Service Manual - Page 84
Bidirectional Error, ThetaĆZeta Error, - carriage belt
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Bidirectional Error You can see an example of a bidirectional error in Figure 3. If you print the same plot using a unidirectional print mode, the error should not appear. This error can occur for various reasons, including: D Incorrect distance between nozzles and media. (Adjustment ' chapter 5.) D EncoderĆstrip slots are damaged or dirty. D Dirt on the pulley is causing the belt to slip. D Friction between carriage bushings and slider rod: ThetaĆZeta Error You can see an example of a ThetaĆZeta error in Figure 3. They appear when the rows of nozzles on a cartridge are not perpendicular to the carriage axis (YĆaxis). This error can occur for various reasons, including: D Badly seated cartridge. D Faulty cartridge. D Faulty carriage. Figure 4 6-8 HP DesignJet 430, 450C and 455CA Printers Print Quality