HP LaserJet 4 Service Manual - Page 246
Paper Size Sensing Lower Cassette
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Table 7-5 Switch Logic for Cassette Size Cassette Legal Letter A4 Executive No Cassette Cassette Size Sensing Switch SW603/851 SW604/852 SW605/853 Upper Middle Lower ON ON OFF ON OFF ON OFF OFF ON OFF ON ON OFF OFF OFF Paper Size Sensing Lower Cassette The operator must set the appropriate paper size for the Lower Cassette using a dial which, in turn, activates switches on the cassette base. This setting is sent to the DC Controller on the serial data bus (SLI). The printer posts a 41.3 SERVICE error if the media is different from that selected with the switch. To verify proper operation of the LC (Tray 3) switches, lock out the MP (Tray 1) and PC (Tray 2) trays (in the Config Menu) and perform the same test with Lower Cassette switches as was done for the PC tray (Tray 2) switches. 7-16 Troubleshooting
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