HP laserjet 3390, 3392 all-in-one Manual Do Serviço

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5.
Remove one screw (callout 3).
3
4
5
5
Figure 5-53
  Remove the memory-tag-reader assembly (2 of 2)
6.
Lift up slightly the back of the memory-tag-reader assembly and then slide the assembly toward
the back of the all-in-one to release it from the laser/scanner plate.
Hint
Make sure that the tab at the bottom of the assembly fits in the all-in-one chassis
(callout 4) and that the front of the assembly is under the laser/scanner shutter (callout 5).
See 
ENWW
Internal assemblies
151