Symptoms
Base printer symptoms
Symptom Action
Buttons on the control panel failed to
respond
Go to “Control panel button service check” on page 101.
• Fan does not come on
• Fan noisy
Go to “Cooling fan service check” on page 99.
No display Go to “Control panel service check” on page 102.
Printer not communicating with host Go to “USB print service check” on page 103.
Machine does not POR (no power)
1 Check the power cord for continuity. Replace if necessary.
2 Make sure the nominal voltage source is within specification. See
“Electrical specifications” on page 239.
3 If the problem remains, go to “Dead machine service check” on
page 100.
Toner starvation and 31.4x error code is
displayed
Go to “Toner starvation service check” on page 102.
Print job not printing on network
attached printer
Go to “Network service check” on page 104.
Network attached printer offline
Cooling fan service check
Action Yes No
Step 1
a Make sure that the cable JFAN1 is properly connected to the controller
board.
b Check if the cooling fan is rotating properly.
Is it rotating properly?
Go to step 2. Replace the cooling
fan. See “Cooling fan
removal” on page
163.
Step 2
a Turn off the printer, and disconnect JFAN1 from the controller board.
b Turn on the printer, and measure the voltage across JFAN1.
Is the voltage approximately 24 V?
Go to step 3. Replace the controller
board. See “Controller
board removal” on
page 164.
Step 3
Is the fan idle?
Replace the cooling
fan. See “Cooling fan
removal” on page
163.
The problem is solved.
4514-420, -430
Diagnostic information
99
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