2 Chapter 1 Troubleshooting control panel messages
EN
Pre-troubleshooting checklist
WARNING!
Always unplug the printer before servicing. Current is present in the
DC power supply whenever the printer is plugged in.
Note
The customer is responsible for ensuring that the maintenance units
are in good condition.
Before troubleshooting any specific printer problem, check the following:
• Has the printer been maintained on a regular basis?
• Are all of the maintenance units within their rated life?
• Is the customer using media as specified in Chapter 5, “Media
specifications” and the
HP LaserJet Family Paper Specification
Guide
?
• Is the media stored correctly and within environmental limits?
• Is the printer installed on a solid, level surface?
• Has the line voltage been checked to make sure that it does not vary
more than 20% from the nominal rated value specified on the power-
rating label?
– Large motors used near the printer can cause temporary voltage
changes.
• Is the operating environment within the parameters listed in the
printer service manual?
• Is the printer protected from substances such as office cleaning
materials and the ammonia gas that is produced by diazo copiers?
• Is the printer protected from direct sunlight?
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