Oki IP-6620 Maintenance Manual page 411

13.
Remove the four screws, and disconnect
the joints and the print head cables for
the BK head and the Y head, and
remove the BK head and the Y head.
Note
Pay attention as ink may leak from the head
nozzle surface if this surface is damaged or
dried.
14.
Disconnect the joints and the print head
cables for the other print heads.
15.
Remove the two E-rings.
Note
The E-rings are small. Pay attention not to
lose them.
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OKI Data Infotech Corporation CONFIDENTIAL
Chapter 6 Parts Replacement (Disassembly/Reassembly)