Lexmark C 950 Service Manual

							Diagnostic information 2-221
  5058-030
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951.xx RIP card assembly NVRAM failure  
953.xx Operator panel assembly NVRAM failure 
955.xx RIP card assembly NAND CRC failure  
StepAction and questionsYesNo
1Perform a POR.
 Does the error occur when the 
power is turned off/on?
Go to step 2.Perform several print tests. 
If the problem remains, then go to 
step 2.
2Turn the printer off for 60 
seconds.
 Does the error occur when the 
power is turned off/on again?
Replace the RIP card assembly. 
Go to “RIP PCBA removal” on page 4-147.
Problem solved.
StepAction and questionsYesNo
1Perform a POR.
 Does the error occur when the 
power is turned off/on?
Go to step 2.Perform several print tests. 
If the problem remains, then go to 
step 2.
2Turn the printer off for 60 
seconds.
 Does the error occur when the 
power is turned off/on again?
Replace the operator panel 
assembly. 
Go to step 3.
Problem reolved
3Perform a print test. Go to “PRINT TESTS” on page 3-22.
 Does the error still occur?
Replace the RIP PCBA.
Go to “RIP PCBA removal” on page 4-147.
Problem resolved
StepAction and questionsYesNo
1Perform a POR.
 Does the error occur when the 
power is turned off/on?
Go to step 2.Perform several print tests. 
If the problem remains, then go to 
step 2.
2Turn the printer off for 60 
seconds.
 Does the error occur when the 
power is turned off/on again?
Replace the RIP PCBA. 
Go to “RIP PCBA removal” on page 4-147.
Problem resolved 
						

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956.00 RIP card assembly processor failure
956.01 RIP card assembly processor over temperature failure 
956.02 RIP card assembly cooling fan failure 
StepAction and questionsYesNo
1Perform a POR.
 Does the error occur when the 
power is turned off/on?
Go to step 2.Perform several print tests. 
If the problem remains, then go to 
step 2.
2Turn the printer off for 60 
seconds.
 Does the error occur when the 
power is turned off/on again?
Replace the RIP PCBA.
Go to “RIP PCBA removal” on page 4-147.
Problem resolved
StepAction and questionsYesNo
1Perform a POR.
 Does the error occur when the 
power is turned off/on?
Go to step 2.Perform several print tests. 
If the problem remains, then go to 
step 2.
2Turn the printer off for 60 
seconds.
 Does the error occur when the 
power is turned off/on again?
Go to step 3.Problem solved.
3Check the RIP card cooling fan 
and heatsink for proper 
installation.
 Is the RIP card cooling fan and 
heatsink installed correctly?
Replace the RIP card assembly.
Go to “RIP PCBA removal” on page 4-147.
Install the RIP card cooling fan 
and heatsink correctly.
StepAction and questionsYesNo
1Perform a POR.
 Does the error occur when the 
power is turned off/on?
Go to step 2.Perform several print tests. 
If the problem remains, then go to 
step 2.
2Turn the printer off for 60 
seconds.
 Does the error occur when the 
power is turned off/on again?
Go to step 3.Problem solved.
3Check the RIP card assembly 
cooling fan and heatsink 
attachment.
 Is the above fan attached 
properly?
Replace the RIP PCBA.
Go to “RIP PCBA removal” on page 4-147.
Reattach the RIP card assembly 
cooling fan and heatsink. 
						

							Diagnostic information 2-223
  5058-030
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956.03 RIP card assembly FPGA failure
980.04 Duplex controller card assembly communication failure
StepAction and questionsYesNo
1Perform a POR. 
 Does the error occur when the 
power is turned off/on?
Go to step 2.Perform several print tests. 
If the problem remains, then go to 
step 2.
2Turn the printer off for 60 
seconds.
 Does the error occur when the 
power is turned off/on again?
Replace the RIP PCBA.
Go to “RIP PCBA removal” on page 4-147.
Problem solved.
StepAction and questionsYesNo
1Check the duplex unit for proper 
installation.
Remove duplex unit assembly, 
and reinstall it.
Perform a 2-sided print test. 
 Does the error still occur?
Go to step 2.Problem solved.
2Check the duplex controller card 
assembly and printer engine card 
assembly for proper connection. 
 Are the connections on the 
duplex controller card 
assembly and the connector 
P417 on the printer engine card 
assembly connected?
Go to step 3.Replace the connection.
3Perform a 2-sided print test.
 Does the error still occur?
Replace the printer left duplex 
door assembly. 
Go to “Printer left duplex door assembly removal” on page 4-139.
Go to step 4.
Problem solved.
4POR the machine, and perform a 
print test. Go to “PRINT TESTS” on page 3-22.
 Does the error continue?
Replace the upper printer engine 
PCBA.
Go to “Upper printer engine PCBA removal” on page 4-184.
Go to step 5.
Problem resolved
5POR the machine, and perform a 
print test. Go to “PRINT TESTS” on page 3-22.
 Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA removal” on page 4-101.
Problem resolved 
						

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980.05 Engine flicker communication failure   
957.01  BITZ1 initialize failure
957.02  BITZ2 initialize failure
StepAction and questionsYesNo
1Perform a POR.
 Does the error occur when the 
power is turned off/on?
Go to step 2.Perform several print tests. 
If the problem remains, then go to 
step 2.
2POR the machine, and perform a 
print test. Go to “PRINT TESTS” on page 3-22.
 Does the error continue?
Replace the upper printer engine 
PCBA.
Go to “Upper printer engine PCBA removal” on page 4-184.
If the error remains, then go to 
step 3.
Problem resolved
3POR the machine, and perform a 
print test. Go to “PRINT TESTS” on page 3-22.
 Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA removal” on page 4-101.
Problem resolved
StepAction and questionsYesNo
1Check the printhead flat data 
cable connections.
 Are the above connections 
properly connected and not 
damaged?
Go to step 2.Problem resolved.
2POR the machine.
 Does the error continue?
Replace the upper printer engine 
PCBA.
Go to “Upper printer engine PCBA removal” on page 4-184.
Problem resolved
StepAction and questionsYesNo
1Check the printhead flat data 
cable connections.
 Are the above connections 
properly connected and not 
damaged?
Go to step 2.Problem resolved
2POR the machine.
 Does the error continue?
Replace the upper printer engine 
PCBA.
Go to “Upper printer engine PCBA removal” on page 4-184.
Problem resolved 
						

							Diagnostic information 2-225
  5058-030
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995.00 Finisher NVM R/W failure
996.00 Finisher type failure
997.00 Duplex controller card assembly type failure
StepAction and questionsYesNo
1Turn the finisher off and on 
several times.
 Does the error still occur when 
the power is on?
Go to step 2.Problem resolved
2Check the finisher PCBA for 
connection.
 Are the connections of the 
finisher controller card 
assembly properly connected?
Replace the finisher PCBA.
Go to “Finisher PCBA removal” on page 4-285.
Problem resolved
StepAction and questionsYesNo
1Check the printer and finisher 
installation.
 Is the finisher installed to the 
printer properly?
Go to step 2.Reinstall the finisher.
2Turn the finisher on and off.
 Does the error still occur when 
the power is back on?
Go to step 3.Problem resolved
3Check the finisher PCBA for 
connection.
 Are the connections of the 
finisher controller card 
assembly properly connected?
Replace the finisher PCBA.
Go to “Finisher PCBA removal” on page 4-285.
Replace the connections.
StepAction and questionsYesNo
1Check the duplex unit for proper 
installation.
Remove duplex unit assembly, 
and reinstall it.
Perform a 2-sided print test. 
 Does the error still occur?
Go to step 2.Problem resolved
2Perform a 2-sided print test.
 Does the error still occur?
Replace the duplex controller 
card assembly. 
Go to “Printer left duplex door assembly removal” on page 4-148.
Go to step 3.
Problem resolved 
						

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999.00 Finisher engine/RIP functional failure
3POR the machine, and perform a 
print test. Go to “PRINT TESTS” on page 3-22.
 Does the error continue?
Replace the upper printer engine 
PCBA.
Go to “Upper printer engine PCBA removal” on page 4-184.
Go to step 4.
Problem resolved
4POR the machine, and perform a 
print test. Go to “PRINT TESTS” on page 3-22.
 Does the error continue?
Replace the lower engine PCBA.
Go to “Lower engine PCBA removal” on page 4-101.
Problem resolved
StepAction and questionsYesNo
1Turn the printer off and on 
several times.
 Does the error still occur when 
the power is on?
Go to step 2.Problem resolved
2Check the finisher PCBA 
connections.
 Are the connections of the 
finisher controller card 
assembly properly connected?
Replace the finisher PCBA.
Go to “Finisher PCBA removal” on page 4-285.
Problem resolved
3Check the upper printer engine 
card assembly connections.
 Are the connections of the 
printer engine card assembly 
properly connected?
Replace the upper printer engine 
PCBA.
Go to “Upper printer engine PCBA removal” on page 4-184.
Go to step 4.
Problem resolved
4Check the lower printer engine 
card assembly connections.
 Are the connections of the 
printer engine card assembly 
properly connected?
Replace the lower engine PCBA.
Go to “Lower engine PCBA removal” on page 4-101.
Go to step 5.
Problem resolved
5Check the RIP card assembly 
connections.
 Are the connections of the RIP 
card assembly properly 
connected?
Replace the RIP card assembly.
Go to “RIP PCBA removal” on page 4-147.
Problem resolved
Step Action and questions Yes No 
						

							Diagnostic information 2-227
  5058-030
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Image quality troubleshooting
Printer-related troubleshooting
First, get a printout as a base, and then follow the symptom table to identify the possible failing FRUs. 
Image quality symptoms 
•Faint print (low contrast)— “Faint print (Low contrast)” on page 2-228.
•Blank print (no print)— “Blank print (no print)” on page 2-230.
•Solid black— “Solid black” on page 2-232.
•Vertical lines and bands (process direction)— “Vertical lines and bands (process direction)” on 
page 2-233.
•Horizontal white stripes or bands (side-to-side direction)—“Horizontal white stripes or bands (side-to-
side direction)” on page 2-234
•Vertical stripes (process direction)— “Vertical stripes  (process direction)” on page 2-236.
•Horizontal stripes (side-to-side)— “Horizontal stripes  (side to side direction)” on page 2-237.
•Partial lack— “Partial lack” on page 2-239.
•Spots— “Spots” on page 2-240.
•After image (ghosting)— “After image (ghosting)” on page 2-242.
•Background fog— “Background fog” on page 2-243. 
•Paper skew—“Paper skew” on page 2-245.
•Media damage— “Media damage” on page 2-246.
•No fuse—“No fuse” on page 2-248.
•Color misregistration—“Color misregistration” on page 2-249.
•Deletions—“Deletions” on page 2-250.
•High frequency bands—“High frequency bands” on page 2-251.
When horizontal lines and/or spots occur periodically, it is possibly caused by a particular roll. In this case, 
measure the interval on the print test, and check the relation to the roll in the printer. The interval does not 
necessarily match the circumference of the roll.  
						

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Image Quality 
Faint print (Low contrast) 
Before starting, check the media route for foreign objects, such as staples, clips, and scraps, in the media path. 
Step Check Yes No
1Check the media condition.
Load new, dry, recommended media, and perform a print 
test. Go to “PRINT TESTS” on page 3-22.
 
Is the image density normal?Problem solved. Go to step 2.
2Check the four toner cartridges for proper installation.
Reprint the defective image.
 
Is the image density normal?Problem solved. Replace any 
empty toner 
cartridges.
3Check the toner add chutes to ensure that they are not 
clogged.
 
Does the problem remain?Go to step 4. Problem solved.
4Check the 2nd transfer roller for contamination and wear.
 
Is the 2nd transfer roller free of excess wear and 
contamination?Go to step 5. Replace the 2nd 
transfer roller.
Go to “2nd 
transfer roller 
removal” on 
page 4-24.
5Check the four PC cartridges for proper installation.
Check the PC cartridge connections.
 
Are the PC cartridge connections free of excess wear 
and contamination?Go to step 6. Correct and 
clean 
contaminated 
pins, or replace 
the appropriate 
PC cartridge or 
connector.
Leading edge
Trailing edge 
						

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  5058-030
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6Check the LED beam route.
Check for debris between the LED printhead assembly 
and the PC drum.
Check the four LED printhead assembly windows for 
contamination.
Perform the printhead cleaning operation.
 
Is the LED beam route free of debris and the glass 
window, in the LED printhead assembly, free of 
contamination?Go to step 7. Remove debris 
or clean the LED 
printhead 
assembly 
window.
7Check the toner dispense motor assembly for proper 
operation.
Replace the toner dispense motor.
Go to “Toner dispense motor removal” on 
page 4-166.
 
Does the problem remain?Go to step 8. Problem 
resolved
8Check the developer HVPS PCBA for proper 
connectivity. Disconnect and reconnect all appropriate 
cables.
Replace the developer HVPS PCBA.
Go to “Developer HVPS PCBA removal” on 
page 4-72.
Perform a print test. Go to “PRINT TESTS” on 
page 3-22.
 
Does the problem remain?Go to step 9. Problem 
resolved
9Check the transfer roll HVPS PCBA for proper 
connectivity. Disconnect and reconnect all appropriate 
cables.
Replace the transfer roll HVPS PCBA.
Go to “Transfer roll HVPS PCBA removal” on 
page 4-178.
Perform a print test. Go to “PRINT TESTS” on 
page 3-22.
 
Does the problem remain?Go to step 10. Problem 
resolved
10Check the upper printer engine PCBA for proper 
connectivity. Disconnect and reconnect all appropriate 
cables.
Replace the upper printer engine PCBA. 
Go to “Upper printer engine PCBA removal” on 
page 4-184. 
Perform a print test. Go to “PRINT TESTS” on 
page 3-22.
 
Does the problem remain?Go to step 11. Problem 
resolved Step Check Yes No 
						

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Blank print (no print) 
Check the media path for foreign objects such as staples, clips, scraps of media.
11Replace the RIP PCBA.
Go to “RIP PCBA removal” on page 4-147.
 
Does the problem remain?Go to step 12. Problem 
resolved
12POR the machine.
Does the problem remain?Replace the 
LED printhead.
Go to “LED 
printhead 
removal” on 
page 4-99.Problem 
resolved
Step Check Yes No
1Check the four toner cartridges for proper installation.
Reprint the defective image.
 
Is the image density normal?Problem solved. Replace any 
empty toner 
cartridges.
2Check the 2nd transfer roller for contamination and 
wear.
 
Is the 2nd transfer roller free of excess wear and 
contamination?Go to step 3. Replace the 2nd 
transfer roller. 
Go to “2nd 
transfer roller 
removal” on 
page 4-24.
3Check the four PC cartridges for proper installation.
Check the PC cartridge connections.
 
Are the PC cartridge connections free of excess 
wear and contamination?Go to step 4. Correct and 
clean 
contaminated 
pins, or replace 
the appropriate 
PC cartridge or 
connector. Step Check Yes No