HP LaserJet 4 Service Manual - Page 252
PS1 Input/Registration Sensor Check
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PS1 (Input/Registration Sensor) Check 1 Power ON the printer with the top cover open. Wait for the 12 PRINTER OPEN (or CLOSE PRINTER COVER) message. 2 Engage PS1 by taping it down. a For the LaserJet 5, install the toner cartridge. 3 Close the top cover. The 02 WARMING UP message should display. 4 After the fuser warms up, the main motor should turn on. 5 The 13 PAPER JAM message appears if the sensor is working correctly. 6 If the 13 PAPER JAM message does not appear, check that PS1 was fully engaged, then replace PS1. 7 Remove the tape from PS1, install the Toner Cartridge and close the top cover. 8 The display should change from 02 WARMING UP to 00 READY. If the 13 PAPER JAM message persists, replace PS1. Figure 7-4 PS1 Input/Registration Sensor 7-22 Troubleshooting