HP LaserJet 9040/9050 Service Manual - Page 186

Note Preliminary operating checks Make sure that the following conditions are met before troubleshooting a specific printer problem: z The printer is plugged in, and the specified power is being delivered. z The selected tray contains media that is correctly loaded and adjusted. z The print cartridge is installed correctly. z The printer receives maintenance on a regular basis. z Any I/O devices are installed correctly. z The customer is using acceptable media z The printer is positioned on a solid, level surface. z The line voltage does not vary more than 10% from the nominal rated value that is specified on the power-rating label. z The operating environment for the printer is within the temperature and humidity specifications. z The printer is never exposed to ammonia fumes. z The printer is not exposed to direct sunlight. z Non-HP components (such as refilled print cartridges, font DIMMs, and memory DIMMs) are removed from the printer. Sudden changes in printer environment can cause image defects and media-handling problems. Always make sure that the printer is not exposed to direct sunlight or to heating or cooling vents. Allow time for the printer and media to acclimate whenever changing environments (for example, moving from a cold environment to a warm one). Acclimation can take anywhere from 3 to 24 hours depending on the ambient conditions. 170 Chapter 7 Troubleshooting