Improved error screening techniques are used in processing digital audio or other types of information received in a digital communication system. The toner supply device includes a conveyance pipe for conveying the toner from the toner container to the developing device downward, and at least one supply pipe for supplying the toner from the conveyance pipe to the developing device downward. Such systems and methods can provide advantages over the prior art, particularly with respect to offshore wells. As two components are coupled together, the adhesive may spread beyond their boarders.