Symptom Action
• Fan does not come on
• Fan is noisy
Go to “Cooling fan service check” on page 109.
Printer not communicating with host Go to “USB print service check” on page 112.
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 237.
3 If the problem remains, go to “Dead machine service check” on
page 110.
Print job not printing on network
attached printer
Go to “Network service check” on page 112.
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
161.
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 162.
Step 3
Is the fan idle?
Replace the cooling
fan. See “Cooling fan
removal” on page
161.
The problem is solved.
4514-220, -230
Diagnostic information
109
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