Introduction - HP LaserJet II Serie Manual De Instrucciones

HP 33440/HP 33449 COMBINED SERVICE MANUAL
7-f. INTRODUCTION
This chapter was designed to provide the information necessary to quicMy identifi the cause of an
HP 33440 or HP 33449 printer failure. Chapter organization is based upon three predominant
sources of symptoms:
Control Panel display messages.
Print quality problems.
Host/printer communication problems.
A series of flowcharts have been included to provide support personnel with a logid sequence of
steps to verify proper printer operation. If a failure should be discovered through the verification
procedure, the engineer can quickly find the appropriate section of Chapter 7 to identify the faulty
component or assembly.
Once a defective printer component is identified as the cause of the failure, service personnel
should reference Chapter 6 ("Removal and Replacement") to effect the repair. If the cause is not
an internal printer component, this chapter should provide the information necessary to resolve
the problem or, at a minimum, reference another appropriate section of the manual.
Section 7-2, "Pre-Troubleshooting Procedures," provides a preliminary checMist designed to
assist the service representative in determining– over the telephone if possible – if a service call is
necessary.
Section 7-3, "Main Flowchart," provides sever~ flowcharts which give a step-by-step sequence of
actions to take to verify proper printer operation.
Section 7-4, "Printer Message Troubleshooting,'> lists Control Panel messages, their causes, and
the appropriate actions to take to respond to them.
Section 7-5, "Image Formation Troubleshooting," describes typical image formation and print
quality problems and the steps to take to correct them.
Section 7-6, "Interface Troubleshooting," describes interface problems be~een the printer and its
host system and the actions to take to correct these problems.
Section 7-7, "Troubleshooting Aids," provides additional troubleshooting material, including a
print image repetitive defect ruler, connection diagrams, the main wiring diagram, followed by a
listing and brief description of the signals illustrated in the diagram, and a signal timing chart.
7-5