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FAQ - C1900 - 25


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C1900 FAQ

 

    Question:
    What can I do once my chart plate gears have slipped and can no longer be calibrated?

    Problem: This problem is not evident in original (MKI) chart plates, only newer (MKII) chart plates. If your chart plate tends to slip while changing pen arms or pens, then care MUST be taken to insure the pen yoke is not moved while changing these items.

    The original (MKI) chart plate used a fixed (screwed in place) black round gear that can withstand some abuse when changing pens. The new (MKII) chart plate however, uses a moon shaped gear that relies on spring tension to keep the gear properly lined up and the teeth engaged. If this spring tension is removed, then the gear may disengage from the mating gear.

 

Original MKI Pen Yoke Assembly
Yoke gear is black and round

Newer MKII Pen Yoke Assembly
Yoke gear is white and moon shaped

 

Gear Alignment with Spring Tension
Everything lines up correctly

Gear Alignment with no Spring Tension
Gear no longer engaged with mating gear

    Solution: Gear alignment IS possible in the field, but it would be much easier on a workbench. The pen that is out of alignment will need to have the mating gear with stop penetrate the first notch of the pen yoke gear in the parked position (see image below).

 

This illustration demonstrates a properly aligned pen yoke assembly
For ease of illustration, The chart plate top was removed and the gear stop was painted black.

    Keep in mind this will only re-align the gear assembly. The Assembly will still easily dis-engage if the spring tension is removed at any time (usually occurs during pen change). If you are experiencing constant pen alignment issues, then I would recommend either purchasing a MKI chart plate assembly or sending the unit in for a MKI upgrade to be installed.

 

ABB, ABB Kent-Taylor, Kent, Taylor and Bailey-Fisher and Porter, are registered trademarks of ABB, Inc.

 

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