Length control, encoder and shear timing, and servo faults on roll forming lines. Most calls start with cut lengths drifting out of tolerance, which is where the diagnosis begins.
Length control that has drifted is usually the first thing anyone notices. Roll forming machine service starts at the encoder, because a drifting count throws off tolerance long before the rest of the line looks wrong.
Roll former repair covers encoder faults, shear and punch timing, and servo drive issues that show up as inconsistent lengths downstream. Because roll forming machine parts wear unevenly across a line, rollers, bearings, and guides are inspected as part of any rollforming machine repair call rather than only the electrical side. You get a written record of what was adjusted and where the wear is trending, so the next stoppage is planned instead of unexpected. Controls too old to hold tolerance are flagged and quoted for retrofit instead of being chased with repeated adjustments.