System Board Removal - Lexmark C78x Service Manual

5061

System board removal

See "System board, network—1xx/3xx only Also order cable tie parts packet (P/N 40X1648)" on page 7-33
for the part numbers.
Note: For a color image of the cabling, see
Warning: When replacing any one of the following components:
•
Operator panel assembly
•
System board assembly
•
Media size sensing assembly
Only replace one component at a time. Replace the required component, and perform a POR before replacing a
second component listed above. If this procedure is not followed, the printer will be rendered inoperable. Never
replace two or more of the components listed above without a POR after installing each one, or the printer will be
rendered inoperable.
Warning: Never install and remove components listed above as a method of troubleshooting components.
Once a component has been installed in a printer, it cannot be used in another printer. It must be
returned to the manufacturer.
1.
Remove the outer system board shield. See
2.
Disconnect all the cables from the system board.
3.
Remove the USB screw (A).
4.
Remove the eight screws (B) type
4-90
Service Manual
"System board cabling reference" on page
"Outer system board shield removal" on page
"232" on page 4-3 from the system board.
5-6.
4-69.