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Cause
The jam occurred due to operational defect of the back gage caused by breakage and detachment of the
brown spring [1] attached to the back gage unit.
[Reference] The same symptom occurs when the red spring [2] or the blue spring [3] is detached.
Field Remedy
The surface treatment of the brown spring is changed to the one that brown coating is applied on top of
nickel-plating, which can make the spring difficult to be broken.
pg. 177
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