Dell 3115cn Service Manual page 464

Removal 34 PRINT HEAD (PL13.3.99)
18) Disengage the connector (P/J12) of the PRINT HEAD (PL13.3.12) from the MACHINE
CONTROL UNIT (PL13.5.13), remove the CORE (PL13.3.13) from the harness.
19) Release the harness of the PRINT HEAD from the three clamps, and then pull the harness
from the hole of the printer.
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Version 2 2007.03.20
Chapter 3 Removal and Replacement Procedures (RRPs)
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Gnb03131KA