Action Yes No
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 210.
Step 3
Is the fan idle?
Replace the cooling
fan. See
“Cooling
fan removal” on
page 209.
The problem is
solved.
Dead machine service check
Action Yes No
Step 1
a Check the power cord for continuity. Replace if necessary.
b Make sure the nominal voltage source is within specification.
See
“Electrical specifications” on page 295.
Go to step 2. The problem is
solved.
Step 2
Check if the power supply cable is properly connected to the
controller board.
Are they properly connected?
Go to step 3. Reseat the cables.
Step 3
a Turn o the printer.
b Remove the power cord.
c Measure the resistance between terminals A and D of the
power supply socket.
Is the resistance approximately 30 ohms?
Go to
“Controller
board service
check” on
page 155.
Replace the power
supply. See
“Power
supply removal” on
page 239.
4514-2xx
Diagnostics and troubleshooting
154
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