Functional Overview

remaining ink. These two coils are part of a flex PCB that also includes the connection pads and the ink leak detection pads.

The ISS board includes the electronics required to measure the level of ink using this variable transformer. The circuit generates the excitation signal applied to the primary coil and reads both the current flowing through the primary coil and the voltage induced at the secondary coil. The secondary voltage vs. primary current ratio gives a measure of the coupling coefficient.

The measured ratio increases with decrease in ink remaining, but the relationship is not linear. Due to the complexity of the bag collapse process an empirical relationship has been developed using characterization data obtained in an experimental way. The ratio vs. remaining ink curves are different for each one of the available supply sizes (175 cc and 350 cc).

The ISS board also includes the circuitry needed to monitor the status of the reservoirs. It is possible to check the electrical continuity of both the primary and the secondary coils and also to detect if the bag has an ink leak. This last function is performed by measuring the current flow between the two ink leak detection pads located in the flex PCB.

Leak Detect System (LDS)

The purpose of the Leak Detect System (LDS) is to detect the breakage of any of the tubes that deliver ink from the Ink Cartridges to the Printheads.

With the tube routing, the tubes are continuously stressed in flexture. When the Carriage moves back and forth, the section of the tube that is stressed also moves causing fatigue cycling.

When a tube breaks, a small crack appears. As the system is pressurized, the ink flows through the crack and gets between the tube and the tube carrier, filling it.

The Carriage end of the tube carrier is sealed with an O-ring that has been overmolded to the tube carrier. This joint prevents the ink from going to the carriage. As one end of the tube carriage is plugged, the ink is forced to go to the other end, which is fixed to the Printer. At that point, below the end of the tube carrier there is an ink collector that retains the ink that drops from the tube carrier by gravity.

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HP DesignJets 1050C and 1055CM Printers Service Manual

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HP 1055CM manual Leak Detect System LDS

1055CM specifications

The HP 1055CM is a large-format printer that stands out in the world of professional printing due to its exceptional capabilities and advanced technologies. Launched as part of HP's Designjet series, the 1055CM is designed to meet the needs of architects, designers, and engineers who demand high-quality output in a variety of applications.

One of the main features of the HP 1055CM is its impressive printing speed. The printer can produce high-quality prints at resolutions up to 1200 dpi, ensuring sharp and vibrant details in every project. This makes it particularly suitable for printing technical drawings, schematics, and high-fidelity graphics. Its ability to work with a range of media types, including bond paper, coated paper, and glossy media, further enhances its versatility in a professional setting.

The HP 1055CM employs a 5-color ink system, which includes cyan, magenta, yellow, black, and light cyan. This configuration allows for a wide color gamut and the production of rich and vibrant colors, making it ideal for color-intensive tasks like marketing materials or presentations. The use of dye and pigment-based inks ensures that prints are not only vibrant but also durable, providing resistance to fading over time.

An important technological advancement in the HP 1055CM is its Print Designjet series technology, which facilitates rapid print processing. The printer's powerful processing capabilities allow it to handle complex files with ease, ensuring that users can produce high-quality output without long wait times. Additionally, the inclusion of a high-capacity media roll means that the printer can handle large jobs without frequent media changes, reducing interruptions in workflow.

Another characteristic of the HP 1055CM is its ease of use. The printer features a user-friendly interface with intuitive controls, allowing users to quickly access various functions and settings. Connectivity options, including USB and Ethernet interfaces, make it easy to integrate the printer into any existing network infrastructure, enabling multiple users to access its capabilities seamlessly.

In summary, the HP 1055CM is a robust and reliable printing solution that combines speed, versatility, and high-quality output. Its cutting-edge technologies and user-friendly design make it an invaluable asset for professionals who require precision and excellence in their large-format printing tasks. Whether for architectural plans or vibrant marketing materials, the HP 1055CM consistently delivers outstanding results.