Dell 2135cn Service Manual page 560

Chapter 3 Removal and Replacement Procedures (RRPs)
24) Disengage all the connectors of the
PWBA MCU (PL10.7.7).
25) Remove the six screws (silver, with
flange, 6mm) that fix the PWBA MCU to
the printer.
26) Remove the PWBA MCU from the
printer.
3 - 58
Version 1 2008.02.01