Mcu(Machine Control Unit) Pwb; Removal - Epson EPL-N4000 Service Manual

EPSON EPL-N4000/EPL-N4000+

4.2.69 MCU(Machine Control Unit) PWB

(See "HVPS and MCU PWB" on page -284)

4.2.69.1 Removal

1. Remove the Rear Cover Assembly. ("Rear Cover Assembly" on
page -140)
2. Disconnect the seventeen P/Js that are connected to the MCU
PWB.
3. Remove the four screws securing the MCU Bracket to the printer
frame, and remove the Bracket and the attached MCU PWB.
4. Remove the six screws securing the MCU Cover to the MCU
Bracket, and remove the Cover.

Wear an electrostatic wrist strap and use caution
when working with the MCU PWB. Static electricity
can damage the sensitive electronics of the MCU.

Handle the MCU PWB by the edges of the PWB or by
the plastic connectors mounted on the board. Never
touch any of the ICs that are mounted on the PWB.
5. Place the Bracket and MCU on a flat, non-conductive surface.
6. Remove the four screws securing the MCU PWB to the MCU
Bracket.
7. Hold on to one of the plastic connectors mounted on the PWB, and
lift the MCU off of the Bracket.
Rev.B
Chapter 4 Disassembly and Assembly
Figure 4-86. Removal of MCU PWB
220