Lexmark C736 Service Manual

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4Place a voltmeter between FUSER1 pin 3 and 
ground (pin 6).
Does the meter read +5 V dc?Go to step 6. Go to step 5.
51. Replace the fuser.
2. Bring the printer up in Diagnostics Menu 
(turn off the printer, press and hold   and 
. and turn on the printer).
3. Select SENSOR TESTS, and press 
Select().
4. Select Dynamic Sensors, and press 
Select().
5. Select Bubble, and press Select().
6. Open the front door.
7. Activate the bubble sensor.
Did the...

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Dead printer service check
A dead printer is a condition where the display is blank, the LED on the operator panel is off, no fans turn, no 
motors turn, and the fuser lamp does not come on.
If a 550-sheet option assembly is installed, remove the option and check the base printer for correct operation. If 
the base printer operates correctly, replace the 550-sheet option assembly.
Warning:Observe all necessary ESD precautions when removing and handling the...

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Exit sensor service check
Step Questions / actions Yes No
1Verify the paper is loaded properly in the 
paper tray or manual feed slot. 
Is the paper properly loaded?Go to step 2. Load paper correctly. 
2Turn the printer off, and remove the fuser. 
See “Fuser removal” on page 4-104. 
POR the printer.
Did the error clear?Problem  resolved. Remove the new fuser, and 
go to step 3.
3Remove the rear frame cover. See “Rear 
frame cover removal” on page...

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Input sensor service check
61. Replace the fuser.
2. Bring the printer up in Diagnostics Menu 
(turn off the printer, press and hold   and 
. and turn on the printer).
3. Select SENSOR TESTS, and press 
Select().
4. Select Dynamic Sensors, and press 
Select().
5. Select Fuser Exit, and press 
Select().
6. Open the front door, and then the top 
access cover.
7. Activate the fuser exit sensor.
Did the fuser exit sensor change from Open to 
Closed?Problem...

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Networking service check
Note:  Before starting this service check, print out the network setup page. This page is found under Menu—
Reports—Network Settings. Consult the network administrator to verify that the physical and wireless network 
settings displayed on the network settings page for the device are properly configured. If a wireless network is 
used, verify that the printer is in range of the host computer or wireless access point, and...

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9Reset the address on the printer to match the 
IP address on the driver.
Did this resolve the issue?Problem fixed. Go to step 10.
10Have the network admin verify that the printer 
and PC’s IP address have identical subnet 
addresses. 
Are the subnet addresses the same?Go to step 12. Go to step 11.
11Using the subnet address supplied by the 
network admin, assign a unique IP address to 
the printer. 
Note: The printer IP address should match 
the IP...

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Operator panel service check
One or more operator panel buttons fail
Operator panel display blank, five beeps, and LED is off
Service tip: The printer has detected a problem with the system board, the operator panel assembly cable (part 
of the top cover access assembly), or the operator panel assembly if POST does not complete. The printer emits 
five beeps, and then sticks in a continuous pattern until the printer is turned off.
Operator panel...

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Operator panel display all diamonds, no beeps
Operator panel display all diamonds, five beeps
Print quality service check
Note:  This symptom may require replacement of one or more CRUs (Customer Replaceable Units) designated 
as supplies or maintenance items, which are the responsibility of the customer. With the customers permission, 
you may need to install a developer (toner) cartridge or photoconductor unit.
Service tip: Before troubleshooting any...

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6.Use Tray 1 to test print quality problems.
7.Print the Print Quality Pages, and then look for variations in the print from what is expected.
An incorrect printer driver for the installed software can cause problems. Incorrect characters could print, and 
the copy may not fit the page correctly.
Measure all voltages from the connector to the printer ground. 
Print quality—background
Service tip: Some background problems can be caused by rough...

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Print quality—blank page
4Reseat the JHVPS connector.
Does this fix the problem?Problem solved. Go to step 5.
5Replace the HVPS. See “High-voltage 
power supply (HVPS) removal” on 
page 4-108.
Does this fix the problem?Problem solved. Go to step 6.
6Clean the printhead.
Does this fix the problem?Problem  solved. Replace the printhead. See 
“Printhead removal, 
installation, and 
adjustment” on 
page 4-135.
Step Questions / actions Yes No
1Is all the...