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HP Designjet T7100 and T7100 Monochrome Printer Series - Ink system components

Ink cartridges

The T7100 printer's six ink cartridges provide black, yellow, magenta, cyan, gray and dark gray ink to the printheads. The T7100 Mono printer has two ink cartridges, black and dark gray.
Figure : Ink cartridge
Ink cartridges require no maintenance or cleaning. When each ink cartridge is shaken vigorously before installation, and inserted correctly into its slot, the ink will flow to the printheads. Because the printheads control the amount of ink that is transferred to the page, high-quality printing results continue even when the ink levels are getting low.
  caution:
Avoid touching pins, leads, and circuitry when handling ink cartridges because these elements are sensitive to electrostatic discharge. Such devices are called ESD-sensitive devices. Electrostatic discharges are one of the main hazards to electronics products. This type of damage can reduce the life expectancy of the device.

Replace ink cartridges

To check the ink levels in the ink cartridges:
  • Press the key repeatedly until you see the ink levels, or
  • Select the icon, then Ink cartridge information.
Figure : Front-panel Ink system information
The front panel warns you when cartridge ink level is low. When a cartridge is empty, the printer stops printing and the front panel provides an explanation.
Figure : Front-panel cartridge error: out of ink
HP recommends that you replace the empty cartridge with a new HP cartridge.
Although it is possible to use refilled or non-HP ink cartridges, either choice has several serious disadvantages:
  • There is some risk of damaging the printer. In this case the printer warranty will not be valid for any printer repairs that are related to the cartridge, nor for any problems due to ink contamination.
  • You will invalidate the warranty of all printheads of the same color used in the printer subsequently, unless and until the whole ink system (including ink tubes) is replaced.
  • Print quality may be impaired.
  • The printer will be unable to estimate the ink level in the cartridge, and will report it as empty.
If you decide to use refilled or non-HP ink cartridges, you will need to follow these instructions to make the printer use a cartridge that it believes to be empty.
  1. Install the cartridge in the printer.
  2. The front panel will complain that the cartridge is empty, and the cartridge removal process will start. Press the Cancel key to stop this automatic process.
  3. At the front panel, select the icon; highlight Replace ink cartridges, but do not select it.
  4. Press the Cancel key and the Up key at the same time, and hold them down for at least two seconds.
  5. The front panel will display a series of warning messages. In response to each message, press the Cancel key to cancel the process, or the OK key to confirm that you wish to continue.
When you have pressed OK in response to all warning messages, the front panel will give the usual ink cartridge status display, but the refilled or non-HP cartridge will be shown as empty with a warning sign.

Printheads

The printheads are connected to the ink cartridges. They use jet action to put ink on the paper. Each printhead has two ink-cartridge connection points and two sets of nozzles, which means that each printhead can print in two different colors. For example, the printhead below prints in magenta and yellow.
Figure : Printhead
The printheads are extremely durable and do not need to be replaced every time an ink cartridge is replaced. They provide excellent results even when the ink cartridges contain a low level of ink.
To maintain optimum print quality, the printheads are automatically tested at regular intervals, and automatically serviced when necessary. This takes a little time and can occasionally delay printing.
When a printhead eventually needs to be replaced, the front panel will display a message.
To check the status of the printheads:
  • Press the key repeatedly until you see the printheads' status, or
  • Select the icon, then Printhead information.
  caution:
Avoid touching pins, leads, and circuitry when handling ink cartridges because these elements are sensitive to electrostatic discharge. Such devices are called ESD-sensitive devices. Electrostatic discharges are one of the main hazards to electronics products. This type of damage can reduce the life expectancy of the device.

Maintenance cartridge

Use the maintenance cartridge to clean and maintain the printheads, ensure the best possible print quality, and seal the printheads when they are not in use to prevent them from drying out.
note:
The maintenance cartridge contains liquid. Therefore, store any maintenance cartridges upright and on a flat surface.
Figure : Maintenance cartridge