A decoder circuit that selects a grayscale voltage responsive to digital input includes a first transistor circuit that selects grayscale voltages greater than a certain voltage and a second transistor circuit that selects grayscale voltages less than the certain voltage. During the preamble dwell interval, selected estimates of one or more received preamble symbols within a plurality of successive data symbols are repeated, in order to generate a longer sequence of preamble symbol estimates. Each mechanism is operated by a lever and thumbturn attached to a centralized cassette. A technique of detecting the presence of defects or failures is near infrared radiation thermography wherein NIR images of the laminated solar cells are taken during the cooling process. Individual pots 2 are formed between the opposing link pieces 3.