To compensate for this normal wear, the adjustable electrode must be moved. The factory setting is 3.5 mm. If your laser is not firing within this range, SG2 should be re-adjusted in, to lower the firing voltage, or out, to raise the firing voltage. If the laser is not performing satisfactorily after adjusting SG2, the laser channel and mirror should be inspected. The fixed electrode will eventually wear to the point that it must be replaced.
Contact PTI to obtain a replacement.
Be sure you have a channel spacer before disassembling the laser head. There are ten screws which hold it shut. It is hinged at the back. After removing the screws, lift the lid up and back. Loosen the four plastic locking screws on the top of the laser head .