HP 3150 EN - Manual (Page 119)

EN Internal assemblies 117
Heating element
1 Remove all covers, the RFI shield, the printer door, the exit roller,
the delivery assembly, the fuser pressure plate, and the front
casing.
2 Disconnect the AC voltage to the heating element by releasing
the connector located on the ECU. Press down on the connector
release with the small flatblade screwdriver (callout 1). (Because
this is a small space, it is much easier to reach the connector with
a screwdriver.) Pull the connector straight out (callout 2).
Figure 45. Heating element removal (1 of 2)
3 Remove the wire from the wire guides along the right side of the
printer.
2 1
2 2