3 - 287Chapter 3 Removal and Replacement Procedures (RRPs)RRP12.6 MACHINE CONTROL UNIT(MCU)(PL 12.2.4)Removal procedures 1) to 10) and replacement procedures 6) to 15) are applicable to thecase when MACHINE CONTROL UNIT(MCU)is replaced.Use the wrist strap to protect the PWB from the electrostatic.[Removal]1) Execute diagnostic operation of NVM Save, and evacuate MCU data.2) When turning on the power while pressing the key, the key and the menu key on thecontrol panel.3) Enter the password, push the key twice and push the key once. The diagnostic screencomes up.4) Press the key several times and display the message of IOT Diag. Press the key once.5) Press the key several times and display the message of NVM settings. Press the keyonce.6) Press the key several times and display the message of MVM Save. Press the key once.7) Press the key once and MVM Save is executed.8) After the NVM Save is finished, press the cancel key several times and display the message ofIOT Diag.9) Press the key several times and display the message of Complete.10) Press the key three times and display the message of Ready to Print.11) Turn off the power.12) Remove the power cord from the outlet.13) Remove LEFT COVER. (RRP 1.10)14) Remove the all connectors on MACHINE CONTROL UNIT(MCU)(PL 12.2.4).15) Remove the four screws (silver, with a flange, 6mm) that fix MACHINE CONTROLUNIT(MCU)to the main unit.16) Remove MACHINE CONTROL UNIT(MCU)from the main unit.[Replacement]1) Attach MACHINE CONTROL UNIT(MCU)to the main unit.2) Fix MACHINE CONTROL UNIT(MCU)to the main unit using the four screws (silver, with aflange, 6mm).3) Attach the all connectors on PWBA MCU.4) Attach LEFT COVER. (RRP 1.10)5) Plug in the power cord to the outlet, and turn the power ON.6) Execute diagnostic operation of NVM Load, and write the data into MCU.7) When turning on the power while pressing the key, the key and the menu key on thecontrol panel.8) Enter the password, push the key twice and push the key once. The diagnostic messageis displayed.9) Press the key several times and display the message of IOT Diag. Press the key once.10) Press the key several times and display the message of NVM settings. Press the keyonce.11) Press the key several times and display the message of MVM Load. Press the key once.12) Press the key once and MVM Load is executed.13) After the NVM Load is finished, press the cancel key several times and display the message ofIOT Diag.14) Press the key several times and display the message of Complete.15) Press the key three and display the message of Ready to Print.
