Dell 2135cn Service Manual page 706

Note: When the PWBA MCU is replaced with a new one, perform the following steps.
(After completing all steps up to Replacement 60.)
4) Plug in the power cord to the printer.
5) Execute diagnostic operation of NVM Load, and write the data into PWBA MCU.
6) Turn off the power.
7) Perform the diagnostic operation of NVM Load, and write the data into the MCU.
8) Turn on the power while pressing the " " key, " " key, and [MENU] key on the control panel.
9) Enter the password, press the " "key twice, and press the "
comes up.
10) Press the " " key once.
11) Press the " " key several times until "IOT Diag" is displayed. Press the "
12) Press the " " key several times until "NVM Settings" is displayed. Press the "
13) Press the " " key several times until "LoadNVM from ESS" is displayed. Press the "
once.
14) Press the " " key once, and NVM Load is performed.
15) After NVM Load is complete, press the [CANCEL] key several times until "IOT Diag" is displayed.
16) Press the " " key several times until "Complete" is displayed.
17) Press the " " key two times. "COPY, SCAN and FAX" are displayed.
18) Turn off the power to exit.
Version 
2008.02.01
Chapter 3 Removal and Replacement Procedures (RRPs)
3 - 204
" key once. The diagnostic screen
" key once.
" key once.
" key