Other symptoms
Base printer symptoms
Symptom Action
Buttons on the control panel failed to
respond
Go to
“Control panel button service check” on page 154.
• Fan does not come on
• Fan noisy
Go to
“Cooling fan service check” on page 152.
No display Go to
“Control panel service check” on page 155.
Printer not communicating with host Go to
“USB print service check” on page 157.
Machine does not POR (no power) Go to
“Dead machine service check” on page 153.
Toner starvation and 31.4x error code
is displayed
Go to
“Toner starvation service check” on page 155.
Print job not printing on network
attached printer
Go to
“Network service check” on page 157.
Network attached printer oine Go to
“Network service check” on page 157.
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 222.
Step 2
a Turn o 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 223.
Step 3
Is the fan idle?
Replace the cooling
fan. See
“Cooling
fan removal” on
page 222.
The problem is
solved.
4514-330
Diagnostics and troubleshooting
152
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