10. ZERO-SETTING OF THE SWINGING UNIT
If the main board and/or the swinging unit need to be replaced, reset the swinging unit as follows after sensitivity has been calibrated: - mount a medium sized wheel (e.g. 5.5”X14”) on the machine with a rim preferably in steel and with a maximum residual unbalance of 10 grams per side; Important: to properly perform the zerosetting of the swinging unit, the wheel rim must be in perfect condition, without deformations or abrasions or dirt in the centring hole or on the plane that rests on the swinging unit. In addition, the centring accessories must be correct for the wheel type and be clean and in perfect condition; - clamp the wheel on the unit, keeping the valve in the 12 o'clock position; - go to the service environment (function 97) as described in the “Service Programme” paragraph; - turning the unit position to encoder position notch 0; - remaining on this notch, hold down the Kis or the Enter button (with the cursor on the “spin counter” icon) for the MONITOR version, whereas hold down the “MAM” button (entering diameters) for the DISPLAY version for approx. 5 seconds. A window with the message “GRP 0” appears on the monitor or the display; - perform a spin; - at the end of the spin, a window with the message “GRP 180” appears on the monitor or the display: - move the wheel valve to the 6 o'clock position, then keeping the unit in this position, loosen the ring nut and return the wheel valve to the 12 o'clock position; - Perform a second spin; - when the spin is complete, the machine will automatically prepare the service environment or function 97; - exit the service environment or function 97 by pressing the “ESCAPE” key; - check that the zero-point has been set correctly for the unit by balancing the wheel. Then, move the wheel valve to the 6 o'clock position and, keeping the unit in this position, loosen the ring nut and return the wheel valve to the 12 o'clock position;