HP LaserJet 4 Service Manual - Page 258
Error Message, Recommended Action, Table 7-9
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Table 7-9 41.X ERROR Checks Error Message Recommended Action 41.1 ERROR Reseat all connectors on the DC Controller, the Laser Noisy Vertical Sync (VS) Drive PCA, the Scanner Connector and the Beam Detect Connector. 41.2 ERROR Beam Detect (BD) weak or unstable. Reseat all connectors on the DC Controller. Also check the Laser Scanning Assembly connections. 41.3 ERROR Paper Multifeed 1. Incorrect size selection on the cassette. 2. One of the cassettes is overfull. Remove the extra paper from the overfull cassette. 3. Check the paper for edge damage. Improperly cut edges can lock together causing multi-feeds. 4. Check that the pickup rollers and separation pad are not worn. Replace the rollers and pad as a set if necessary. Ensure that the corners of the paper are tucked in the tray's retainers. 5. Check the paper tension adjustment on the optional Lower Cassette, if attached. Refer to procedure in Chapter 3. 41.4 ERROR Reseat the DC Controller and Formatter PCA Connections. Vertical Sync Late (VS) Signal 41.5 ERROR Reseat the DC Controller and Formatter PCA connections. Undetermined Cause See Figures 7-11 through 7-17 for connector locations. 7-28 Troubleshooting