3-28 Phaser 7500 Printer Service Manual
Error Messages and Codes
General Sensor Failure
Initial Actions
• Check the paper path for debris.
• Power cycle the printer.
• If the problem persists, follow the procedure below.
Troubleshooting Procedure
Step Actions and Questions Yes No
1 Perform the appropriate Sensor
tests in Diagnostics.
Does the Sensor operate properly?
Replace the
PWB that the
Sensor is
connected to.
Go to step 2.
2 Check the connection of the
relevant Sensor.
Check the connection between the
relevant Sensor and the MCU PWB.
Is the connector properly
connected?
Go to step 3. Reconnect the
wiring harness
connector.
3 Check the harness conductivity
Is the harness between the
relevant Sensor and the MCU PWB
conducting normally and not
grounded?
Go to step 4. Replace the
wiring harness.
4 Check the voltage that is supplied
to the relevant Sensor.
Refer to “Plug/Jack and Wiring
Diagrams” on page 10-1 to check
the connection to the relevant
parts and measure the voltage of
the PWB Connector that the Sensor
is connected to.
Is a voltage being output?
Replace the
Sensor.
Refer to “+5 VDC
Power
Troubleshooting
” on page 4-15.
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