Cartridge Carriage Rubbing Against Encoder Strip; Premature Wearing Of Drive Belts; Sensor Does Not Correctly Find Media Edge; Last Swath Is Clipped When Replotting - HP DesignJet 200 Service Manual

Cartridge Carriage Rubbing against Encoder Strip

When properly installed, the encoder strip should pass through the cartridge carriage
assembly without touching it. Sometimes excessive rubbing may be experienced, causing the
encoder strip to buckle or vibrate, and thus causing errors in the carriage axis servo feedback
system and poor carriage axis position tracking.
You can adjust the encoder strip position by adjusting the position of the encoder spring
bracket. To do this, perform the following procedure:
1 Remove the power cord from the plotter.
2 Remove the window, center cover and right endcover.
3 Manually position the carriage assembly in the center of the plotter.
4 Loosen the top and bottom screws of the adjustable encoder spring bracket.
5 Manually move the bottom of the bracket about the bracket's top screw until the encoder
strip is centered in the carriage; then tighten the screws.

Premature Wearing of Drive Belts

The main belt or the small Y drive belt may wear prematurely if the plotter is placed near a
diazo copier that uses ammonia to produce blue line copies. The material used in the belts is
very reactive to ammonia vapor. The vapor is very corrosive and can damage other parts as
well. It is recommended to move the plotters away from such copiers.

Sensor does not Correctly Find Media Edge

Excessive ink deposits on the drive roller surface can fool the sensor by reflecting the light.
(Cleaning roller D chapter 4.)

Last Swath is Clipped when Replotting

This bug on DesignJet 200 plotters will be solved in firmware revision A.01.02.
(Details D chapter 9.)
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