Lexmark C912 Service Manual - Page 51

2. Diagnostic information 5055-xxx 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 2-4, the "Attendance messages" on page 2-34, or the "Symptom table" on page 2-63 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. Adjustments and procedures following parts replacement Note: When troubleshooting, or prior to making any adjustment to print quality, always be sure: • The printer is installed on a level rigid surface. • The photodevelopers are never exchanged. Do not exchange a black photodeveloper for a color photodeveloper, as they have different surface phase counts. • The Alignment Page is used when adjusting print registration. Whenever you replace any of the following parts be sure to perform the required adjustments or procedures. The adjustments are in the Repair information and Diagnostic aids chapters. Diagnostic information 2-1