Lexmark C 746 Service Manual

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201.06, 201.08, 201.31—Paper Jam error service check
2Run align motor test with old pick assembly 
installed in the machine.
1. Bring the printer up in Diagnostics Menu 
(turn off the printer, press and hold 
buttons 3 and 6, then turn on the printer). 
2. Navigate to MOTOR TESTS > Align 
Motor Test > Forward.
Can you hear the align motor run?Go to “920.06—Input 
sensor service check” on 
page 2-99.Go to step 3.
31. Plug in the new pick assembly into...

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3Turn the printer off, and then remove the 
fuser. See “Fuser removal” on page 4-110.
Is the exit sensor flag damaged?Replace the fuser. See 
“Fuser removal” on 
page 4-110. Go to step 4.
4Verify the paper is loaded properly in the 
paper tray or manual feed slot. 
Is the paper properly loaded?Go to step 5. Load paper correctly. 
51. Replace the fuser. See “Fuser removal” 
on page 4-110.
Note: Do not reset the fuser count until 
the problem is resolved.
2....

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8Place a voltmeter between Fuser DC 
autoconnect pin 8 and ground (pin 6).
Does the meter read +5 V dc?Go to step 9. Replace the fuser DC 
cable. See “Fuser DC 
cable removal” on 
page 4-113.
91. Replace the fuser. See “Fuser removal” 
on page 4-110.
2. Bring the printer up in Diagnostics Menu 
(turn off the printer, press and hold 
buttons 3 and 6, then turn on the printer). 
3. Navigate to SENSOR TESTS > Dynamic 
Sensors > Fuser Exit.
4. Open the...

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203.09—Paper Jam error service check
Step Questions / actions Yes No
1Open the front access door. Turn the 
transport belt gear clockwise.
Did the transport belt move?Go to step 2. Replace the transport belt. 
See “Transfer module 
removal” on page 4-171. 
2Turn the printer off, and then remove the 
fuser. See “Fuser removal” on page 4-110.
Is the exit sensor flag damaged?Replace the fuser. See 
“Fuser removal” on 
page 4-110. Go to step 3.
3Verify the paper...

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61. POR the printer.
2. Place a voltmeter between pin 8 and pin 6 
(ground) on the JFUSER1 connector on 
the system board.
3. Does the meter read +5 V dc?Go to step 7.  Replace the system board. 
See “System board 
removal” on page 4-155. 
7Place a voltmeter between the fuser 
autoconnect pin 8 and ground (6).
Does the meter read +5 V dc?Go to step 8. Replace the fuser DC 
cable. See “Fuser DC 
cable removal” on 
page 4-113. Step Questions / actions...

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230.03, 230.05—Paper Jam error service check
81. Replace the fuser. See “Fuser removal” 
on page 4-110. 
2. Bring the printer up in Diagnostics Menu 
(turn off the printer, press and hold 
buttons 3 and 6, then turn on the printer). 
3. Navigate to SENSOR TESTS > Dynamic 
Sensors > Fuser Exit.
4. Open the front access door and top 
access cover.
5. Activate the fuser exit sensor.
6. Did the fuser exit sensor change from 
Open to Closed?Problem resolved....

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242.02—Paper Jam service check
5• Check the front access cover for any 
damage.
• Make sure the front access cover can 
close correctly.
• Check the front access cover if its 
securely fastened to its hinge.
Is the front access cover damaged?Replace the front access 
cover. See “Front access 
cover assembly removal” 
on page 4-29. Go to step 6.
61. Check the duplex reference edge guide 
assembly for damages.
2. Check the gears, rollers and belt for...

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242.03, 242.11—Paper Jam service check
3Carefully lift the printer off the option, and lay 
the printer on its back. Check the option 
connector for damage.
Is the option cable connector or cable 
damaged?Replace the option cable. 
See “Option cable 
removal” on page 4-135.Go to step 4.
4Replace the complete tray 2 option.
Does the error clear?Problem resolved. Replace the system board. 
See “System board 
removal” on page 4-155.
Step Questions / actions Yes...

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242.05—Paper Jam service check
4Is tray 2 a high-capacity input tray (2,000-
sheet feeder)?Replace the HCIT top 
plate. See “Top plate 
assembly removal” on 
page 4-206. Replace the entire tray 2 
option.
Step Questions / actions Yes No
1Has the paper been fed from an input option 
before?Go to step 5. Go to step 2.
21. Bring the printer up in Diagnostics Menu 
(turn off the printer, press and hold 
buttons 3 and 6, then turn on the printer).
2....

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242.10—Paper Jam service check
4Carefully lift the printer off the option, and lay 
the printer on its back.
Check the option connector for damage.
Is the connector damaged?Replace the option cable. 
See “Option cable 
removal” on page 4-135.Go to step 5.
5Is tray 2 a high-capacity input tray (2,000-
sheet feeder)?Go to step 7. Go to step 6.
6Replace the tray 2 option.
Does the error clear?Problem resolved. Replace the system board. 
See “System board...