The manual says......
After a repair to the chain saw, the control unit may not be adapted to the mechanical and mechatronic components initially. The chain saw may not have optimum power or faults may appear in the running behavior.
Calibration adapts the control unit optimally to the mechanical and mechatronic components of the chain saw.
Calibrating the chain saw is recommended whenever any of the listed components is replaced or is reinstalled :
–Crankcase
–Crankcase gasket
–Oil seals
–Crankshaft
–Piston
–Cylinder gasket
–Cylinder
–Injection module
–Injector housing
–Injection valve
–Sensor
–Generator
–Flywheel
–Clutch
–Control unit – only if the control unit is replaced.
–Injection pump
–Throttle shutter housing
–Air filter – only if the air filter is replaced.