Lexmark 4049LMO Service Manual - Page 58

Paper Size Sensing Problem, Tray 1, Sheet Option or 200-Sheet Second Drawer, Non-Rt, Sheet Tray 2, Rt

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4049-XXX ity of the fan/mirror motor cable. Replace the printhead if the cable is good. Paper Size Sensing Problem (The printed area does not fit on the page, or the paper size cannot be changed from the operator panel.) Make sure the paper tray and its stops are undamaged. Make sure the cable to the paper size switch is connected correctly. With the paper tray removed, the resistance of the paper size switch should be infinite. With the tray installed, the resistance of the switch varies with the paper size. For Tray 1, remove the front cover, disconnect the cable from the sensor and measure the resistance between the two pins on the sensor board. For 500-Sheet Option or 200-Sheet Second Drawer, Non-Rt, remove the RIP Board, disconnect J15 from the engine board, and measure between J15-3 and J15-4 on the cable. For 200-Sheet Tray 2, Rt, remove the RIP board, disconnect J17 from the engine board, and measure between J17-3 and J17-4 on the cable. If the readings do not match the following within 5% replace the paper size sensor. Tray installed and set to: A5 B5 10.5" 11" A4 13" or 14" 1.4K Ohms 2.0K Ohms 3.0K Ohms 4.7K Ohms 8.0K Ohms 17.8K Ohms (legal tray) 2-31

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2-31
4049-XXX
ity of the fan/mirror motor cable. Replace the printhead if the cable is
good.
Paper Size Sensing Problem
(The printed area does not fit on the page, or the paper size cannot
be changed from the operator panel.)
Make sure the paper tray and its stops are undamaged. Make sure
the cable to the paper size switch is connected correctly. With the
paper tray removed, the resistance of the paper size switch should
be infinite. With the tray installed, the resistance of the switch varies
with the paper size.
For
Tray 1
, remove the front cover, disconnect the cable from the
sensor and measure the resistance between the two pins on the
sensor board.
For
500-Sheet Option or 200-Sheet Second Drawer, Non-Rt
,
remove the RIP Board, disconnect J15 from the engine board, and
measure between J15-3 and J15-4 on the cable.
For
200-Sheet Tray 2, Rt
, remove the RIP board, disconnect J17
from the engine board, and measure between J17-3 and J17-4 on
the cable.
If the readings do not match the following within 5% replace the
paper size sensor.
Tray installed and set to:
A5
1.4K Ohms
B5
2.0K Ohms
10.5”
3.0K Ohms
11”
4.7K Ohms
A4
8.0K Ohms
13” or 14”
17.8K Ohms (legal tray)