Oki IP-6620 Maintenance Manual page 531

(3) Ink box
Ink box is equipped on the left side of the printer, and contains the slots where to install the six or
seven ink cartridges. This box is equipped with a mechanism to prevent incorrect installation of
the ink cartridges, ink needles, and an ink relay board.
- Mechanism against incorrect installation
Each ink cartridge includes a button specific to its color, and the ink box front part is equipped
with slits corresponding to these specific buttons to make it possible to enter only the correct
cartridge to its corresponding slot.
- Ink needle
By inserting the needle into the spout of the ink cartridge pack, the ink is supplied to the ink
tube.
- Ink relay board (PCB-ASSY-INK4)
A relay board for reading/writing the memory in the ink cartridge.
- Ink box cover switch
Ink box cover switch is a micro switch installed inside the ink box cover, and detects the ink
box cover status (open/closed). When the ink box cover switch detects that the cover is
closed after the ink cartridge replacement, the printer starts the operation.
(4) Ink supply tube
The ink from the ink cartridge set into the printer is supplied by the supply pump to the head unit
from the ink tube via the ink needle and filter. The 20 μ filter installed immediately after the ink
needle traps the rubber residue that is generated when the ink passes through the spout in the
ink cartridge. When ink cartridges are set, ink from each ink cartridge is sent to each ink pump
with the ink system priming.
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OKI Data Infotech Corporation CONFIDENTIAL
Chapter 8 Operation Mechanism