HP LaserJet 9040/9050 Service Manual - Page 183

Troubleshooting process Note The troubleshooting process is a systematic approach that addresses the primary problems first, and then other problems, to discover the causes for printer malfunctions and errors. The "Basic troubleshooting process flow" on page 168 illustrates the primary steps for troubleshooting the printing system. Each heading depicts a primary troubleshooting step. A "yes" answer to the questions allows troubleshooting to proceed to the next primary step. A "no" answer indicates that additional testing and correction is needed. Proceed to the referenced location in the chapter and follow the directions there. After completing the additional testing and correcting the problem, proceed to the next primary step. It is important to always follow this process in sequence. Failure to do so can result in increased repair time, difficulty, and expense. This list describes the basic questions to answer and the corresponding troubleshooting sections to help quickly define the problem(s). Table 18. Primary steps for troubleshooting "Power-on" on page 174 Does the printer perform the initialization and power-on sequence? "Printer-message tables" on page 179 "Paper-path test" on page 213 This section contains the procedures for correcting power-supply problems. Does the control panel indicate an error condition? This section contains the procedures for clearing control-panel messages. Is it possible to perform a paper-path test? This section contains information about troubleshooting paper-path and print-media problems. "Evaluate the information pages" Is there information in the event log? on page 226 This section contains the procedures for printing the information pages and evaluating and correcting printer configuration. "Image-formation troubleshooting" on page 233 Does the print quality meet customer expectations? This section contains print-cartridge checks, information about EconoMode, image-defect examples, and the repeating-defect ruler. "Media troubleshooting" on page Is the media being used acceptable for this printer? 244 This section contains information about how to determine print-media problems and correct them. "Communication troubleshooting" on page 246 Can the customer print from the host system successfully? This section describes how to determine whether the printer is communicating correctly with the host system. Troubleshooting process 167