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 on the toner cartridge 
chip for damage and contamination.
2. Clean the contacts.
Are the chip contacts damaged?Replace toner cartridge. Go to step 5.
51. Check the cartridge contact and bell crank 
on the printer.
2. Press each of the contacts to check the 
spring force.
3. Check the bell crank for any damage.
Are the bell crank and cartridge contacts 
damaged?Replace the cartridge 
contact with bell crank.
Note: Only replace the 
parts that are damaged.Go to step 6.
61. Check JSB1 on the system board for 
proper connection.
2. Check for damage and pinch points on the 
connector.
3. Reseat cable.
Is the cable connector free of damaged?Replace the cartridge 
contact with bell crank.
Note: Only replace the 
parts that are damaged.Go to step 7.
7Check the whole length of the cable going to 
the cartridge contact. Check for any damage 
and pinch points. 
Are the cables damaged?Replace the cartridge 
contact with bell crank.
Note: Only replace the 
parts that are damaged.Go to step 8.
8Replace the system board. See “System 
board removal” on page 4-155.
Did this fix the problem?Problem resolved.  Replace the cartridge 
contact with bell crank.
Note: Only replace the 
parts that are damaged.
Step Questions / actions Yes No
1View the Event Log:
1. Turn off the printer, press and hold 
buttons 3 and 6, then turn on the printer.
2. Select EVENT LOG.
3. Select Display Log. 
Has an 110.xx error occurred three times or 
more?Replace the printhead. See 
“Printhead removal, 
installation, and 
adjustment” on 
page 4-145. Go to step 2. 
						

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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 to step 3.
3Measure the continuity across all of the fuses 
on the system board. 
Are any of the fuses blown?Replace the system board. 
See “System board 
removal” on page 4-155. Go to step 4.
4Perform the printhead verification to check 
whether the new printhead will solve the 
problem. See “Printhead verification” on 
page 3-39.
Perform the Mirror Motor Test. See “Mirror 
Motor Test” on page 3-20. 
Did the Mirror Motor pass the test?Replace the printhead. See 
“Printhead removal, 
installation, and 
adjustment” on 
page 4-145.Replace the system board. 
See “System board 
removal” on page 4-155. 
Step Questions / actions Yes No
1View the Event Log:
1. Turn off the printer, press and hold 
buttons 3 and 6, then turn on the printer.
2. Select EVENT LOG.
3. Select Display Log. 
Has an 111.xx,112.xx, 113.xx, or 114.xx error 
occurred three times or more?Replace the printhead. See 
“Printhead removal, 
installation, and 
adjustment” on 
page 4-145. Go to step 2.
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 JPH1 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 5 V interlock 
switch. See “5 V interlock 
switch cable removal” on 
page 4-61.Go to step 3.
3Measure the continuity across all of the fuses 
on the system board.
Are any of the fuses blown?Replace the system board. 
See “System board 
removal” on page 4-155.Go to step 4.
4Perform the printhead verification to check 
whether the new printhead solves the 
problem. See “Printhead verification” on 
page 3-39. 
Perform the Servo Laser Test. See “Servo 
Laser Test” on page 3-20. 
Did the printhead motor pass the test?Replace the printhead. See 
“Printhead removal, 
installation, and 
adjustment” on 
page 4-145.Replace the system board. 
See “System board 
removal” on page 4-155.  Step Questions / actions Yes No 
						

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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 AC autoconnect cable for 
damage, check the other end of the cable 
for damaged pins. 
3. Check the fuser DC autoconnect cable for 
damaged pins.
Are the connections damaged?Replace the appropriate 
cable. See “Fuser AC 
cable removal” on 
page 4-112 or “Fuser DC 
cable removal” on 
page 4-113.Go to step 3.
3Replace the fuser. See “Fuser removal” on 
page 4-110.
Does the error clear? Problem resolved. Go to step 4.
A
230
Fuser autoconnects
DC autoconnect
AC autoconnect
On printer 
						

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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 points, and the cable or 
connector for any other damage.
Is the cable damaged?Replace the LVPS. See 
“Low-voltage power 
supply (LVPS) removal” 
on page 4-119.Go to step 6.
6Measure the continuity across all of the fuses 
on the system board.
Are any of the fuses blown?Replace the system board. 
See “System board 
removal” on page 4-155. Go to step 7.
7Check for the following continuity between the 
DC autoconnect JFUSER1 on the system 
board.
Is continuity present?Go to step 8. Replace the fuser DC 
cable. See “Fuser DC 
cable removal” on 
page 4-113.
8Check for continuity between the following 
pins of the AC autoconnect and the pins of 
the connector that connects to the LVPS. 
Is continuity present?Replace the system board. 
See “System board 
removal” on page 4-155.Replace the fuser AC 
cable. See “Fuser AC 
cable removal” on 
page 4-112. Step Questions / actions Yes No
DC auto-
connectJFUSER1
Pin 9 Pin 9
Pin 10 Pin 10
LVPS 
connectAC Auto-
connect
Pin 1 Pin 5
Pin 3 Pin 1 
						

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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 printer.
Did the error clear?Problem resolved. Go to step 2.
2Measure the continuity across all of the fuses 
on the system board.
Are any of the fuses blown?Replace the system board. 
See “System board 
removal” on page 4-155.Go to step 3.
31. Disconnect the cable in the connector 
JFDPCK1.
2. Connect the cable for the new paper pick 
mechanism. 
3. Bring the printer up in Diagnostics Menu 
(Turn off the printer, press and hold 
buttons 3 and 6, then turn on the printer).
4. Navigate to MOTOR TESTS > Tray 1.
Did the new pick motor turn before the feed 
error occur?Replace the paper pick 
mechanism. See “Paper 
pick mechanism 
assembly removal” on 
page 4-137. Replace the system board. 
See “System board 
removal” on page 4-155.
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 connectors JCARTP1 
and JCARTS1 (cartridge motor 1/fuser 
motor cable) for proper connection to the 
system board, for cable pinch points, and 
for any other damage to the cable or 
connectors.
Is either cable damaged?Go to step 3. Go to step 2. 
						

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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 before installation, leaving the 
original cable in place. Make sure to verify if 
the new cable is working properly. If new 
cable does not correct problem, do not install 
it.
Did the error clear?Problem solved Go to step 4.
4Measure the continuity across all of the fuses 
on the system board.
Are any of the fuses blown?Replace the system board. 
See “System board 
removal” on page 4-155. Go to step 5.
51. Plug the cartridge motor1/fuser motor 
cable to a new EP drive assembly.
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 MOTOR TESTS > Tray 1.
Did the error clear?Replace EP drive 
assembly. See 
“Electrophotographic 
(EP) drive assembly 
removal” on page 4-90.replace the system board. 
See “System board 
removal” on page 4-155. Step Questions / actions Yes No 
						

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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 damaged?Replace the cartridge 
motor 1/fuser cable. See 
“Cartridge motor 1/fuser 
cable removal” on 
page 4-67.Go to step 2.
2Remove the right cover. See “Right cover 
removal” on page 4-51. Check the cartridge 
motor 1/fuser motor cable (A) for proper 
connection to the EP drive assembly, for 
pinch points for the cable, or damage to the 
cable or connector.
Is either cable damaged?Replace the cartridge 
motor 1/fuser motor cable. 
See “Cartridge motor 1/
fuser cable removal” on 
page 4-67.Go to step 3.
3Measure the continuity across all of the fuses 
on the system board. 
Are any of the fuses blown?Replace the system board. 
See “System board 
removal” on page 4-155.Go to step 4. 
41. Disconnect the cartridge motor 1/fuser 
motor cable on the motor and on the 
system board.
2. Connect a new motor 1/fuser motor cable 
on the motor and on the system board.
3. Run diagnostics 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 MOTOR TESTS.
Did the motor run?Replace the cartridge 
motor 1/fuser motor cable. 
See “Cartridge motor 1/
fuser cable removal” on 
page 4-67.Go to step 5. 
						

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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 MOTOR TESTS.
Did the motor run?Replace the EP drive 
assembly. See 
“Electrophotographic 
(EP) drive assembly 
removal” on page 4-90.Go to step 6.
61. Connect the new EP drive assembly with 
a new cable from outside the machine.
2. Run diagnostics 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).
3. Select MOTOR TESTS.
Did motor run?Replace the cable. Replace the system board. 
See “System board 
removal” on page 4-155.
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 cable. See “Cartridge 
motor 2/3 cable removal” 
on page 4-69.Go to step 2. Step Questions / actions Yes No 
						

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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 blown?Replace the system board. 
See “System board 
removal” on page 4-155.Go to step 4.
41. Disconnect the cartridge motor 2/3 cable 
on the motor and on the system board.
2. Connect a new motor 1/fuser motor cable 
on the motor and on the system board.
3. Run diagnostics 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 MOTOR TESTS.
Did the motor run?Replace the cartridge 
motor 2/3 cable. See 
“Cartridge motor 2/3 
cable removal” on 
page 4-69.Go to step 5.
51. Return the old cartridge motor 2/3 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 MOTOR TESTS.
Did the motor run?Replace the EP drive 
assembly. See 
“Electrophotographic 
(EP) drive assembly 
removal” on page 4-90.Replace the system board. 
See “System board 
removal” on page 4-155. Step Questions / actions Yes No 
						

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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 cable. See “Cartridge 
motor 2/3 cable removal” 
on page 4-69.Go to step 2.
2Remove the right cover. Check the cartridge 
motor 2/3 cable for proper connection to the 
EP drive assembly, pinch points for the cable, 
and 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 blown?Replace the system board. 
See “System board 
removal” on page 4-155.Go to step 4. 
41. 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.
2. 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).
3. Select MOTOR TESTS.
Did the motor run?Replace the EP drive 
assembly. See 
“Electrophotographic 
(EP) drive assembly 
removal” on page 4-90.Replace the system board. 
See “System board 
removal” on page 4-155.