HP LaserJet 4250 Service Manual - Page 416
Troubleshooting the stacker and the stapler/stacker, Initial checks
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Troubleshooting the stacker and the stapler/stacker When troubleshooting problems are related to the stacker or stapler/stacker, you might find that it is difficult to distinguish whether the malfunction relates to the stacker, the stapler/stacker, or the printer. The troubleshooting procedures in this section assume that the stacker or stapler/stacker is installed on a printer that is working normally. Always correct any printer errors before attempting to troubleshoot the stacker or stapler/stacker. Stacker and stapler/stacker errors fall into four groups: ■ Jam errors ■ Paper-transport errors ■ Malfunction errors ■ Component errors Jam and transport errors result when media does not move successfully from the printer through to the stacker or stapler/stacker. Malfunction errors cause the stacker or stapler/stacker to stop or to operate incorrectly. Component errors that are the result of an internal component failure and generate errors messages that appear on the control-panel display. For more information about control-panel messages, see Alphabetical printer messages and Numerical printer messages. Initial checks ■ Before troubleshooting the stacker or stapler/stacker, verify that any printer errors have been corrected. The printer must be operating normally before you can troubleshoot the stacker or stapler/stacker. See Alphabetical printer messages and Numerical printer messages. ■ Inspect the stacker or stapler/stacker connectors on the unit and on the printer. Verify that the connectors are not damaged, and that the stacker or stapler/stacker is installed correctly. If the stacker or stapler/stacker was installed while the printer power was on, turn the power off and then on again. ■ Verify that the environmental specifications are met. The specifications for the stacker and stapler/stacker are the same as for the printer. See Operating environment. ■ Verify that the media being used meets HP specifications. See Supported media weights and sizes and Paper and print media. ■ If the stacker or stapler/stacker was recently moved from a cold environment (for example, a warehouse) into a warm room, condensation within the device might be causing the problem. If condensation occurs, either wipe the parts with a dry, lint-free cloth, or leave the stacker or stapler/stacker turned on for 10 to 20 minutes. 402 7 Troubleshooting