Lexmark C 746 Service Manual

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Service checks 
31.xx—Cartridge errors service check
110.xx—Mirror motor service check
Step Questions / actions Yes No
1POR the printer. 
Did this fix the problem?Problem resolved. Go to step 2.
2Replace the toner cartridge.
Did this fix the problem?Problem resolved. Go to step 3.
3Reseat the toner cartridges and make sure 
they are installed to their correct color slots.
Did this fix the problem?Problem resolved. Go to step 4.
41. Check the contacts...

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111.xx, 112.xx, 113.xx, and 114.xx—Printhead error service check
2Turn the printer off, and then remove the rear 
frame cover. See “Rear frame cover 
removal” on page 4-47. Check the cable in 
connector JMIRR1 for proper connection to 
the system board, the printhead cable for 
pinch points, and the cable or connector for 
any other damage.
Is the cable damaged?Replace the printhead. See 
“Printhead removal, 
installation, and 
adjustment” on 
page 4-145.Go...

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120.xx—Fuser error service check
Step Questions / actions Yes No
1Check the input voltage switch on the back of 
the low-voltage power supply (LVPS).
Note: Some LVPS FRU do not have switches 
and switch automatically. If your does not 
have a switch, go to step 2.
Is the voltage level (115 V/230 V) properly 
set?Go to step 2. Set the switch for the 
proper country voltage.
21. Remove the fuser. See “Fuser removal” 
on page 4-110. 
2. Check the fuser...

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4Remove the rear frame cover. See“Rear 
frame cover removal” on page 4-47. Check 
the cable in connector JFUSER1 (fuser DC 
cable) for proper connection to the system 
board, the cable for pinch points, and the 
cable or connector for any other damage.
Is the cable damaged?Replace the fuser DC 
cable.See “Fuser DC 
cable removal” on 
page 4-113.Go to step 5.
5Check the cable in connector JLVPS2 for 
proper connection to the system board, the 
cable for pinch...

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140.xx, 920.02—Autocomp (tray 1) motor error service check
142.xx, 906.01–906.04—Motor (fuser) error service check
Step Questions / actions Yes No
11. Turn the printer off.
2. Remove the rear frame cover. See “Rear 
frame cover removal” on page 4-47.
3. Check the cable in connector JFDPCK1 
for proper connection to the system board, 
the cable for pinch points, and the cable or 
connector for any other damage.
4. Reseat the cable.
5. POR the...

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21. Remove the right cover. See “Right 
cover removal” on page 4-51. 
2. Check the cartridge motor 1/fuser motor 
cable for proper connection to the EP 
drive assembly (A), for pinch points for the 
cable, and for cable or connector damage.
Is either cable damaged?Go to step 3.  Go to step 4.
3Replace the cartridge motor1/fuser motor 
cable. See “Cartridge motor 1/fuser cable 
removal” on page 4-67.
Note: Make sure to check the replacement 
cable first...

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143.xx—Motor (EP drive assembly top cartridge 1 motor) error service check
Step Questions / actions Yes No
11. Turn the printer off.
2. Remove the rear frame cover. See “Rear 
frame cover removal” on page 4-47.
3. Check the cable in connector JCARTP1 
and JCARTS1 (cartridge motor 1/fuser 
motor cable) for proper connection to the 
system board, for the cable for pinch 
points, and for the cable or connector for 
any other damage.
Is the cable...

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144.xx—Motor (EP drive assembly middle cartridge) error service check
51. Return the old motor 1/fuser motor cable.
2. Disconnect the motor drive cable from the 
EP drive assembly and connect it to the 
motor on a new EP drive assembly. 
Note: Do not install the new EP drive 
assembly yet.
3. Run diagnostic motor check. Bring the 
printer up in Diagnostics Menu (turn off 
the printer, press and hold buttons 3 and 
6, then turn on the printer).
4. Select...

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2Remove the right cover. See “Right cover 
removal” on page 4-51. Check the cartridge 
motor 2/3 cable for proper connection to the 
EP drive assembly, pinch points for the cable, 
or damage to the cable or connector (A).
Is either cable damaged?Replace the cartridge 
motor 2/3 cable. See 
“Cartridge motor 2/3 
cable removal” on 
page 4-69. Go to step 3.
3Measure the continuity across all of the fuses 
on the system board. 
Are any of the fuses...

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145.xx—Motor (EP drive assembly bottom cartridge) error service check
Step Questions / actions Yes No
11. Turn the printer off.
2. Remove the rear frame cover. See “Rear 
frame cover removal” on page 4-47.
3. Check the cables in connector JCARTP2 
and JCARTS2 (cartridge motor 2/3 cable) 
for proper connection to the system board, 
for cable pinch points, and for any other 
damage to the cable or connector.
Is the cable damaged?Replace cartridge motor 2/
3...