HP LaserJet 4 Service Manual - Page 274

Table 7-24 Improperly Sized Image Possible Cause Action PC tray Microswitches. The paper tray Perform the "Cassette Size Switches microswitches indicate the paper size of (SW603, SW604, SW605) Functional the installed tray. This information is used Check" on page 7-15. Ensure that the to format the print image to the size of correct envelope size is selected if the paper installed in the tray. If the paper appropriate. tray microswitches are defective, the image is formatted incorrectly. PS 5 is defective. PS 5 senses the trailing edge of the media being fed from the MP tray. If improperly sized images result from printing from the MP tray, check that PS 5 is functioning correctly mechanically and electrically. This feature allows odd-sized media to be printed with the MP tray. Troubleshoot PS 5 as shown in the following procedure. MP Paper Size is not set correctly. Use the MP Paper Size Button on the Front Panel to correctly configure paper size for the MP Tray. PS5 Check (MP Tray Paper End Sensor) Functional Test 1 Make a test sheet by cutting a notch in the trailing edge of a sheet of paper as shown in Figure 7-9. 2 Perform the set up procedures listed for the PS4 check (MP Tray Empty Sensor) on page 7-17, and put the test sheet into the MP tray when the display reads XX LOAD LEGAL. 3 The self test print should stop 2 to 5 mm above the notch (see Figure 7-9). 4 Print that extends into cut out area indicates that the sensor PS5 is not free in its travel or is defective. Ensure that the sensor lever is free throughout its entire range of travel. If not, replace the lever or the sensor itself. 7-44 Troubleshooting