Lexmark 4049LMO Service Manual - Page 52

Paper Feed, Duplex Unit, Paper Feed Magnet Adjustment

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Page 52 highlights

4049-XXX incorrect or the torquer motor or solenoid is defective. Adjust the solenoid air gap (see "Paper Feed Magnet Adjustment" on page 4-8). On torquer machines, make sure the torquer gear is not slipping on the shaft. Engine board J14-1 should always be +34 VDC; J14-2 should be +34 VDC when the torquer or solenoid is not picking. Short engine board pin J14-2 to ground and listen carefully for the torquer or solenoid; it will move slightly and make a noise. If it does, replace the engine board. • The D-roll will move slightly but will not complete an entire revo- lution. This indicates a bind or defect in the gear train, or a misalignment of the torquer motor gear timing marks. If paper is jamming, clean the paper path of obstructions or repair any damaged parts. Very thin or thick paper, labels, transparencies, or card stock has a higher jam rate than regular xerographic paper. Check the condition of the paper in the tray and verify that the tray is installed correctly. If the paper feeds but stops undamaged in the paper path run the input and exit sensor test. Check for +5 VDC at the input sensor (engine board J9-6) and exit sensor (engine board J8-6) with paper present. Check continuity on the cable before replacing a sensor. If paper is curling badly enough to cause a problem feeding or stacking, see "Fuser Temperature And Warm-Up Time" on page 3-8. Paper Feed, Duplex Unit Check that all gears and belts are working correctly both in the duplex unit and on the tray top cover, and that the gear on the tray top cover correctly engages the gear on the duplex unit. If paper is jamming in the table cover area, make sure the table cover is properly installed. Run diagnostics Duplex Test 1 to make sure the paper is feeding far enough into the duplex unit before reversing. Examine the condition of all rollers. If paper is stopping or jamming as it is fed back across the top of the paper tray, run diagnostics Duplex Test 2 to make sure there is no slippage in the paper path. Make sure the paper tray top cover is not damaged. Cold paper curl can also cause jams here; see "Fuser Temperature And Warm-Up Time" on page 3-8. 2-25

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2-25
4049-XXX
incorrect or the torquer motor or solenoid is defective. Adjust the
solenoid air gap (see
“Paper Feed Magnet Adjustment” on page
4-8
). On torquer machines, make sure the torquer gear is not
slipping on the shaft. Engine board J14-1 should always be +34
VDC; J14-2 should be +34 VDC when the torquer or solenoid is
not picking. Short engine board pin J14-2 to ground and listen
carefully for the torquer or solenoid; it will move slightly and
make a noise. If it does, replace the engine board.
•
The D-roll will move slightly but will not complete an entire revo-
lution. This indicates a bind or defect in the gear train, or a mis-
alignment of the torquer motor gear timing marks.
If paper is jamming, clean the paper path of obstructions or repair
any damaged parts. Very thin or thick paper, labels, transparencies,
or card stock has a higher jam rate than regular xerographic paper.
Check the condition of the paper in the tray and verify that the tray is
installed correctly. If the paper feeds but stops undamaged in the
paper path run the input and exit sensor test. Check for +5 VDC at
the input sensor (engine board J9-6) and exit sensor (engine board
J8-6) with paper present. Check continuity on the cable before
replacing a sensor.
If paper is curling badly enough to cause a problem feeding or stack-
ing,
see
“Fuser Temperature And Warm-Up Time” on page 3-8
.
Paper Feed, Duplex Unit
Check that all gears and belts are working correctly both in the
duplex unit and on the tray top cover, and that the gear on the tray
top cover correctly engages the gear on the duplex unit.
If paper is jamming in the table cover area, make sure the table
cover is properly installed. Run diagnostics Duplex Test 1 to make
sure the paper is feeding far enough into the duplex unit before
reversing. Examine the condition of all rollers.
If paper is stopping or jamming as it is fed back across the top of the
paper tray, run diagnostics Duplex Test 2 to make sure there is no
slippage in the paper path. Make sure the paper tray top cover is not
damaged. Cold paper curl can also cause jams here;
see
“Fuser
Temperature And Warm-Up Time” on page 3-8
.