An inkjet print head includes a jet assembly, a printed-circuit board and a barrier coating film. According to one technique, a device comprises a configuration module. The LEDs are electrically mounted to projections extending from one of the contact plates towards the other contact plate. The server uses a wake-up time schedule that includes the wake-up times for the set-top boxes that it services to determine if the wake-up time will create too much load for the server given the set-top boxes already scheduled to wake-up around the wake-up time. The circular glass includes two opposite surface. By using the epoxy resin, surface roughness of a printed circuit board can be formed in an ecofriendly and economic manner.