HP Designjet 2800/3800cp Service Manual - Page 324
Service Station Assembly, Primer Assembly, Refill Assembly, Encoder Strip, Trailing cable
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Encoder Strip The encoder strip is used by the carriage Assembly as a reference point. The carriage assembly sensor reads windows in the encoder strip. This enables the carriage assembly to know exactly where it is on the Y-axis assembly. Trailing cable The trailing cable consists of three ribbon cables. There are 32 conductors in each cable, however conductor number 1 and 32 are not used, as they can be broken when removing or installing. The three cables are all strapped together, but are misaligned to make them easier to connect to the carriage assembly. One end of the trailing cable is printed with red lines. These show the engineer which end of the trailing cable to install into the carriage assembly. Service Station Assembly The Service Station is housed inside the right hand cover. At the top of the Service Station is the printhead cleaner carriage. This assembly contains four printhead cleaners (one for each printhead). Printhead cleaners are disposable cassettes which maintain the condition of the printheads. The main functions of the Service Station are: D Move the Printhead Cleaner Carriage to the different positions needed to perform the maintenance tasks on the printheads. D Enable the change of the printhead cleaners by the customer. D Press caps on the printhead cleaners against the printheads with sufficient force to assure a perfect seal. D Move the wipers on the printhead cleaners with a minimum speed to clean the printheads. Primer Assembly The Primer Assembly applies a vacuum to the printhead. It is a sub-assembly of the Service Station Assembly. It has two chambers (one larger than the other). Air is moved from one chamber to the other by a motor, this results in a vacuum which is applied to the printhead for maintenance purposes. Refill Assembly The Refill Assembly is housed inside the left hand cover. It refills all four printheads simultaneously when the ink in any of the printheads fall below a certain threshold. Ink is moved from the ink cartridges to the printheads via four tubes. The ink is sucked up the four tubes to valves in the Refill Assembly by air pressure. This is controlled by the raising and lowering of the ink cartridges, which is done by the Elevator Assembly. Functional Overview HP DesignJet CP Series Printers 10-5