A clamp pin has two clamping jaws, each having a clamping arm and an actuating arm. The information recorded in the reproducing layers are reproduced by means of reproducing light beams of different wavelengths, respectively. The differential local data line voltage is subsequently amplified to form an amplified differential local data line voltage. When the press moves to its first position the can is collapsed. After the state of the current carrying SCRs is determined the current carrying state of the SCRs is confirmed during a delay time period. It is important that the first channel accounts for at least about 70% of the total channel volume.