Fig 1-41 Control Panel; Table 1-81 Blank, Erratic, Or Inoperative Control Panel - Xerox DOCUPRINT N4525 Service Quick Reference Manual

RAP 1-52
Blank, Erratic, or Inoperative Control Panel
The Control Panel Display is blank or displays garbled text, or the Control Panel does not
respond to user input.

Table 1-81 Blank, Erratic, or Inoperative Control Panel

Step Actions and Questions
1 PRINTER STATUS TEST
1. Switch on printer power and wait 2 minutes for
warm-up to complete.
2. Use any application on the host computer to generate
a few prints.
Does the printer generate prints?
2 CONTROL PANEL TEST
Power on printer while simultaneously pressing [0],
[5], & [7].
Do the Control Panel LEDs light up and does
the display show Chn-00 Fun-00?
3 SYSTEM CONTROLLER BOARD
REPLACEMENT
1. Replace the System Controller Board (RRP 1-73).
Is the problem still present?
4 LOW VOLTAGE POWER SUPPLY +5VDC
CHECK
Measure the voltage between J400, pins 1, 2 & 3 (on the
Print Engine Controller Board) and frame ground.
Is there +5VDC between J400, pins 1,2 & 3 and
frame ground?
LOW VOLTAGE POWER SUPPLY
5
REPLACEMENT
Replace the Low Voltage Power Supply (RRP 1-67).
Is the problem still present?
6 The following printer components and areas are
associated with this specific problem. One or more of
these components or areas may have failed partially or
completely. If you cannot isolate this problem using the
steps in this Fault Isolation Procedure, replace each
component or troubleshoot each area listed below, one at
a time, until you isolate and solve the problem.
Wiring and connectors linking the components


Input/Output Board (RRP 1-70).


Volume 1 / Print Engine - Troubleshooting
Yes No
Go to step 2 Go to RAP
1-50 and
troubleshoot
an inoperative
printer
Go to step 3 Go to step 4
Replace the Problem
Print Engine solved
Controller
Board (RRP
1-70)
Replace the Go to step 5
Control Panel
(RRP 1-7)
Go to step 6 Problem
solved
1-109