CAUTION If the 2000-sheet Input Tray is sitting underneath the printer, paper jams may occur because the printer will not pick up the paper. To prevent excessive paper jams during this test, feed only 6 to 8 pages. 1 Make sure that paper is in the tray. 2 Set the DIP switches on the Controller PCA for stand-alone running mode (see Table 7-15 for an explanation of the settings). 3 To set the power supply switch to Diagnostic Mode, pull the blue power supply switch outward. The motors will start. Paper should now be lifted from the tray and fed through the VTU. • If the unit does not work properly, the lower Service LED on the Controller PCA flashes in a pattern that indicates the problem.
(See Table 7-16 on page 443 for an interpretation of the LED patterns.) 4 To stop the test, set the power supply switch back to Operational Mode, and set the DIP switches on the Controller PCA to the off position (see Table 7-15). Open the VTU, and remove any media from the paper path. C4085-91087 Self - Diagnostics on Paper-handling Devices 441