HP Pro 4300 C9H70UT C9H70UT#ABA manual Introduction

Introduction

In order to use the information in this chapter, you should have a basic understanding of the LaserJet printing process. Explanations of each mechanical assembly, the printer systems, and the basic theory of operation are contained in chapter 5 of this manual. Do not perform any of these troubleshooting processes unless you understand the function of each printer component.

This chapter contains the following sections:

●Troubleshooting process This section includes an initial troubleshooting checklist and a troubleshooting flowchart. These contain information about common printer errors that can inhibit proper operation or create print-quality problems. They also include recommendations for resolving the cause of the problem. See “Troubleshooting process” on page 231.

●Troubleshooting tools This section contains information that helps to isolate the cause of printer failures. This section contains information about printing information and test pages, resetting printer options, using the diagnostics and service menus, and how to use the embedded Web server. See “Troubleshooting tools” on

page 239.

●Interface troubleshooting This section provides techniques for isolating the source of communication problems to the printer hardware, the printer configuration, the network configuration, or the software application. See “Interface troubleshooting” on page 255.

●Display-message troubleshooting This section explains each control-panel- display message and suggests recommendations for resolving the cause of each message. When the printer message indicates a failure for which the root cause is not obvious, use the printer error troubleshooting section and the troubleshooting tools section found later in this chapter to solve the problem. See “Display-message troubleshooting” on page 257.

●Paper-path troubleshooting This section provides information to help solve feed problems. Including print media checks, jam troubleshooting checks, and information about media-caused and printer-caused jams. See “Paper-path troubleshooting” on page 295.

●Image-formation troubleshooting This section explains methods for solving print-quality problems. See “Image-formation troubleshooting” on page 306.

●Stacker and stapler/stacker troubleshooting This section provides information about solving stacker and stapler/stacker problems. See “Troubleshooting the stacker and the stapler/stacker” on page 326.

●Printer and accessory components This section contains illustrations and tables that list the printer and accessory internal components. See “Printer component locations” on page 332 and “Accessory component locations” on page 339.

●Printer and accessory wiring diagrams This section contains wiring diagrams for the printers and accessories. See “Printer and accessory wiring diagrams” on page 348.

●General timing diagrams This section contains timing diagrams for the printer. See “General timing diagrams” on page 357.

230 Troubleshooting Q2431-90912