Lexmark W820 - Service Checks; Error Code Service Checks

Diagnostic Information 2-11
4025-XXX
Service Checks
Before entering the service checks:
1. Is the AC power provided at the wall outlet within specifications for this printer; either
110VAC or 220VAC?
2. Is the AC power cord in good condition; neither frayed nor broken?
3. Is one end of the AC power cord connected to the printer?
4. Is the other end of the AC power cord plugged into a grounded three-prong AC wall
outlet?
5. Is the printer located in an area where the temperature and humidity are moderate
and stable?
6. Is the printer located in an area free of dust?
7. Is the printer located away from water outlets, steamers, electric heaters, volatile
gases, or open flames?
8. Is the printer shielded from the direct rays of the sun?
9. Does the printer have adequate ventilation space around all sides?
10. Is the printer sitting on a level and stable surface?
11. Is the paper stock used in the printer as recommended in the User Manual?
12. Does the customer use the printer as instructed in the User Manual?
13. Are consumables replaced at the recommended intervals?
14. Do you have access to Printer Diagnostics and do you know how to use them?
15. Are all of the printer assemblies in place and are all printer covers and doors firmly
closed?
Error Code Service Checks
Error Code 902
There is a problem with the Printhead.
Logic Control on the MCU PWB received a constant HIGH signal from the Start of Scan
(SOS) Sensor.
Step Actions and Questions Yes No
1 RESET
1. Switch off printer main power.
2. Wait one minute.
3. Switch on printer main power.
Does the error code appear?
Go to step 2 Suspect an
intermittent
problem with
the MCU
PWB, the
Laser Diode
PWB, the
SOS Sensor,
or the
connectors
and wiring
linking these
FRUs.