Inoperative Control Panel; Rev.b - Epson EPL-N4000 Service Manual

EPSON EPL-N4000/EPL-N4000+
Table 3-15. Erratic Operation
Step Actions and Questions
7 HOST/PRINTER
CABLE REPLACEMENT
Replace the interface cable connecting
the host to the printer.
Is the problem still present?
8 ESS PWB REPLACEMENT
Replace the ESS PWB
4)
Does the printer still exhibit erratic
operation?

Rev.B

Yes
INTERFACE Go to step 8 Problem
solved
Go to Problem
Suspect solved
(See Chapter
Components

3.3.3 Inoperative Control Panel

The Control Panel LEDs, LCD, and /or Keypad do not function or do not
No
function correctly.
Step
SUSPECT COMPONENTS
The following components are
associated with this specific problem.
One or more of these components may
have failed partially or completely. If you
cannot isolate the problem using this FIP,
replace each component listed below,
one at a time, until the problem
disappears.
• Wiring and connectors linking the
components.
• ESS PWB
1 CONTROL PANEL TEST
1. Remove the Control Panel from the
Top Cover
2. Connect the Control Panel to P 410 on
the MCU PWB.
2 C262
REPLACEMENT
Replace the C262 Main Controller
Board.
Is the problem still present?
Chapter 3
Table 3-16. Inoperative Control Panel
Actions and Questions
MAIN CONTROLLER
Troubleshooting
Yes No
Go to step 2 Go to step 3
Replace the Problem
MCU PWB solved
(See
Chapter 4)
104