Section Contents - Xerox Phaser 4400 Service Manual

Troubleshooting

Section Contents

Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Measurements . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-1
Troubleshooting Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-2
Index of Troubleshooting Procedures. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Image-Quality Checkout Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .3-41
Index of Image-Quality Checkout Procedures . . . . . . . . . . . . . . . . . . . . . . . . 3-41
Image-Quality Troublesh
Index of Image-Quali
Introduction
This section covers two ty
Troubleshooting proce
I
messages or codes
Troubleshooting Proce
I
Troubleshooting procedu
or subassembly, in some
In the Yes/No steps of the
next step or will indicate
corrective action, restart t
corrected.
Measureme
Power and signal grounds are connected to frame ground. You can perform all circuit
troubleshooting using the metal frame (chassis) as the grounding point. If you need
more information to locate connectors or test points, refer to
Unless otherwise specified, the following voltage tolerances are used within this
section:
Voltage Measurements
Stated
+3.3 VDC
+5.0 VDC
Phaser 4400 Laser Printer Service Manual
ocedures . . . . . . . . . . . . . . . . . . . . . . . .3-53
problems not directly associated with error
rmally isolate a problem to a specific component
Measured
+3.0 to 3.6 VDC
+4.8 to +5.2 VDC
ooting Procedures . . . . . . . . . . . . . . . . . . . 3-53
ubleshooting procedures:
mage-quality (IQ) problems
ding the wire harnesses.
s, a Yes/No response will either lead you to the
e action. When you complete the indicated
Check to verify that the problem has been
Stated
+24.0 VDC +21.6 to +26.4 VDC
0.0 VDC
Wiring Data
Measured
Less than +0.5 VDC
on page 9-1.
3-1