Lexmark 4049LMO Service Manual - Page 55

4049-XXX 1 1 1 1 1 J16 J17 J1 J2 RXD J4 TXD J3 J5 J5-1 carries the pick signal for Feeder 1, J5-8 carries the pick signal for Feeder 2, and J5-10 is +34 VDC. When the feeder is connected, all three pins have +34 VDC. For early level machines using the external J5/J10 adapter box, J5-8 and J5-10 are +34 VDC, J5-1 is 0 VDC, and J10-1 and J10-2 are +34 VDC. For all machines, if the J510 and J10-1 voltages are incorrect replace the engine board. If the other voltages are wrong, continue with this service check. To test the torquers, short J5-1 (Feeder 1) or the J5-8 test point (Feeder 2) to ground; the torquer rotates slightly and makes a noise. Turn the power off and disconnect the feeder connector. There should be 88 ± 10 ohms between pins 1 and 10, and between pins 8 and 10. Reconnect the feeder and make sure neither J5-1, nor the J5-8 test point, nor the J5-10 test point has continuity to ground. Skews or Jams: Check for worn, dirty, or damaged rolls, gears, or envelope bucklers; obstructions in the paper path, correct paper/ envelopes properly installed; edge guides and flip doors properly positioned; and paper load shafts installed parallel to the frame. Gear chatter or continuous paper feed: Remove the right cover and verify that the gear alignment marks are centered in the windows of the gear plate when the torquer is in its detent position. Refer to "Dual Rear Feeder Gear Alignment Adjustment" on page 4-4. Continuous feed may also be caused by a short to ground of J51 (Feeder 1) or J5-8 (Feeder 2). Diagnostic Information 2-28