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 309.
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 153.
Replace the power
supply. See
“Power
supply removal” on
page 252.
Controller board service check
Service checks which involve measuring voltages on the power supply should be performed with the printer
positioned on its rear side.
Note: When making voltage readings, always use frame ground unless another ground is
specified.
See the
wiring diagram in the back of the book for more information.
Warning—Potential Damage: Do not replace the control panel and controller board at the same time. Each
card contains the printer settings. When either of these cards is new, it obtains some of the settings from the
other card. Settings are lost when both are new and replaced at the same time.
Action Yes No
Step 1
POR the machine.
Did the control panel , fuser, fan and drive motor function at startup?
Go to step 2. Go to step 3.
Step 2
Run some print jobs.
Does the error remain?
Go to step 3. The problem is
solved.
Step 3
Check all cables on the controller board.
Are they connected properly?
Go to step 5. Go to step 4.
4514-330
Diagnostics and troubleshooting
153
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