2-48 Service Manual
7541-03x
121.05 Fuser - fuser heater error
ON / OFF switch automatically switching to the Off position service check
Note: If the machine turns off a few seconds after a POR, follow the procedure below. The automatic shut
down of the printer is a safety feature implemented to avoid fire, or damage to the printer. This is a feature
of the device.
126.xx Power switch error
Step Action and questions Yes No
1 Is the fuser installed and seated properly? Go to step 2. Properly install
the fuser.
2
Are CN02 and CN04 on the LVPS, and CN16 on the
printhead control board properly connected?
Go to step 3. Properly connect
all the cables.
3
Check the fuser connectors on the fuser power cable
for damage. Is there any damage?
Replace the fuser
power cable.
Go to step 4.
4
Check the fuser power cable for continuity. Is there
continuity?
Go to step 5 Replace the fuser
power cable
5
Replace the fuser. Does this fix the problem? Problem solved Go to step 6.
6
Replace the printhead controller board. Does this fix
the problem?
Problem solved Go to step 7.
7
Replace the LVPS. See “Low volt power supply
removal” on page 4-51. Does this fix the problem?
Problem solved Replace the fuser
power cable.
Step Action and questions Yes No
1 POR the printer a couple times. Does the printer turn
off a few seconds after the POR?
Note: When restarting the machine, you should see
the power switch physically move to the off position
when the machine turns off.
Go to step 2. Problem resolved
2
Replace the fuser, power supply, and printhead
controller board. Does this fix the problem?
Problem
resolved.
Contact your
second level
support
Step Action and questions Yes No
1 Is the power switch cable properly connected to CN27
on the engine controller board?
Properly connect
the connector.
Go to step 2
2
Replace the power switch. Does this fix the problem? Problem resolved Go to step 3.
3
Replace the engine controller board. Does this fix the
problem.
Problem resolved Go to step 4.
4
Replace the power switch cable harness. Does this fix
the problem?
Problem resolved Contact your
second level
support.
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