18 Printer systems
Printer systems
There are two places for additional slots but these are covered over.
The upper and lower ISS both contain PCAs, although the top PCA contains more functionality, such as
the pressure sensor, see ⇒ Page 6.
Non-return valves
The two non-return valves are only for the inks on the lower IDS.
This is to ensure that when the pump stops and the cartridges are
nearly empty, that the ink does not flow back to the cartridge.
If a cartridge is nearly empty, with no pressure from the pump,
the cartridge bag might increase, and air might enter the
printhead.
With a valve, the ink can go only from the cartridge to the
printhead, and not the reverse!
Air Pressure System (APS)
The APS contains two air pumps which are used to force the ink through the tubes to the carriage
assembly. In the event of a broken bag in one of the Ink Cartridges, these tubes must be checked in case
any of the leaked ink has been forced into the air tubes.
Related tests, utilities, and calibrations
• Ink Delivery System tests:⇒ Page 146.
Service parts
• Left hand assembly: ⇒Page 276
Removal and installation
• Ink supply tubes and trailing cable: ⇒Page 380
• ISS to Cartridge Cables: ⇒Page 385
• Ink Supply Station: ⇒Page 388
• Ink Supply Station PCAs: ⇒Page 391
• APS Assembly: ⇒Page 395.
• APS Assembly: ⇒Page 395.
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