Oki IP-6620 Maintenance Manual page 415

23.
Reinstall the head base, the print heads,
and all other carriage parts in the reverse
order of the removal procedure.
24.
Loosen the two thumb screws (on the
right and left).
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OKI Data Infotech Corporation CONFIDENTIAL
Chapter 6 Parts Replacement (Disassembly/Reassembly)