HP 8550 Service Manual - Page 459
System-to-device troubleshooting, Pre-troubleshooting checklist
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System-to-device troubleshooting Note Pre-troubleshooting checklist Before troubleshooting any specific printer/copier problem, make sure the following conditions are met: l The printer should be disconnected from the network before beginning troubleshooting (to make sure that the failure is associated with the printer). l The printer driver is correct and current for the printer installed. l The printer is being turned off with the copy module soft switch, not by unplugging the printer or by using the main switch on the copy module, so that cooling fans run through their entire cycle. l Any overdue maintenance should be performed in advance of troubleshooting. l The printer maintenance units are within their rated life. The customer is responsible for ensuring that the items included in the printer consumable kits are in good condition. l The printer has been maintained on a regular basis as described in chapter 4 of the HP Color LaserJet 8500/8550 Printer Family Service Manual. Note the location of any spilled or accumulated toner before troubleshooting. Toner contamination might indicate ventilation or printer-environment problems. l The toner catch tray is not overfull. Empty the toner catch tray, if necessary, and identify the source of excessive waste toner. l The customer is using supported media. l The operating environment is within the specified parameters listed in chapter 1 of this manual. l The printer is not exposed to ammonia gas such as that produced by diazo copiers or office cleaning materials. l The printer is never exposed to direct sunlight. l The media are stored correctly and within environmental limits. l The printer is installed on a solid, level surface. l The line voltage does not vary more than 10% from the nominal rated value specified on the Power Rating Label. Suspect this problem if large motors are used near the printer, as they might cause temporary voltage changes. l Any non-HP components (toner, memory boards, and EIO cards) should be removed from the printer. EN System-to-device troubleshooting 457