HP LaserJet 4 Service Manual - Page 257

41.X ERROR Message A 41.X ERROR (misprint) indicates that a temporary malfunction has occurred with the print engine (NOT a Formatter error). Occasional occurrences of this message can be expected. However, persistent 41 ERROR messages indicate a problem requiring attention. The 41.X ERROR is usually accompanied by a blank, or partially printed page. Pressing the [Continue] (or Go) key re-prints the page, and continues the print job. A 41 ERROR occurs due to the following conditions: • Incorrect Universal Tray Switch setting. Set the Universal Tray and the Lower Cassette Tray paper size as shown in Chapter 3. • Wrong size paper in tray. Check that the Universal Tray, and/or the Lower Cassette settings match the installed paper. • An unstable or temporary loss of the Beam Detect pulse. This problem normally is accompanied by a partially printed page, often with thin horizontal black lines, deformed characters, or solid black areas. Loss of the Beam Detect pulse for more than 2 seconds results in a 51 ERROR condition. • Paper reaching the Input Paper Sensor (PS1) before it is expected. This is accompanied by a blank page. This normally is due to paper feed problems. Proceed as directed in the following table. Troubleshooting 7-27