Lexmark C920 Service Manual - Page 43

2. Diagnostic information 5056-XXX Start The diagnostic information in this chapter leads you to the failing part. Before you replace an entire assembly, determine if just the defective part is available in the parts catalog. Use the error code tables, symptom table, service checks, and the diagnostic aids chapter to determine the symptom and repair the failure. The removal procedures in the Repair information chapter may help you identify parts. After you complete the repair, perform the appropriate tests to verify the repair. If an error is displayed, locate it in the "Service error message tables" on page 2-5, the "Attendance messages" on page 2-30, or the "Symptom table" on page 2-3, and take the appropriate action. If an error message appears while you are working on the printer, go to the error message table and take the indicated action. Warning: Do not use a RIP board or operator panel from another C920 for diagnosing problems or errors on the printer being serviced. This can damage the machine. CAUTION: Unplug power cord from the printer or electrical outlet before you connect or disconnect any cable or electronic board or assembly for personal safety and to prevent damage to the printer. Disconnect any connections between the printer and PCs peripherals. The printer requires at least two people to lift it safely. Make sure your fingers are not under the printer when you lift or set the printer down. CAUTION: If the printer is kept on, never touch the conductive parts while it is not specifically required. Do not touch the LVPS cards and the motor driver board unless they are properly discharged. Never touch the live parts. Warning: Warning: When operating the driving units using the diagnostics or other tools, be sure to keep them covered unless otherwise specified. When operating the driving units using the diagnostics or other tools, never touch the driving units. When operating the driving units using diagnostics or other tools, be sure to follow the procedures in this manual. CAUTION: Be careful to avoid burns by safely handing hot parts. Warning: Servicers should wear a wrist band or the like to remove static electricity from their body, grounding their body while working. Go to "Handling ESD-sensitive parts" on page 4-1 Initial check Before you start troubleshooting, check the following: Installation environment • The power supply line voltage is plus or minus 10% of the rated line voltage. • The machine is securely installed on a level surface in a well-ventilated place. • The room temperature is between 10 and 32°C (50 and 90°F) and the relative humidity between 20 and 80%. • Avoid sites generating ammonia gas, high temperature, high humidity (near water faucets, kettles, humidifiers), cold spaces, near open flames, and dusty areas. • Avoid sites exposed to direct sunlight. Diagnostic information 2-1