Lexmark E220 Service Manual - Page 31

2. Diagnostic information 4500-E320/E322 Start Diagnostics (E320/E322) Note: For diagnostic information about models E220/E321/E323 see "Diagnostics (E220/E321/E323) " on page 2-35 for more information. CAUTION: NEVER manually actuate or disable the top cover interlock switch and the printhead shutter actuator at the same time. To perform some of the service checks and tests, such as troubleshooting paper feed problems, you need to actuate the top cover interlock switch with the covers open or removed and power applied to the machine. It is important for personal safety that you DO NOT, FOR ANY REASON, disable the printhead shutter actuator when power is on. Unplug power from the printer before connecting or disconnecting any cable or electronic board or assembly for personal safety and to prevent damage to the printer. Use the service error code, user error message, symptom table, service checks, and diagnostic aids in this chapter to determine the corrective action necessary to repair a malfunctioning printer. The lights on the operator panel can indicate either a user error message or service error message. When a service error occurs, the printer stops printing and all operator panel lights blink in a continuous pattern, indicating a service error, until the printer is powered off. If all operator panel lights are blinking, go to the "Service error codes " on page 2-11 for more information. When a user error message occurs, one or more operator panel lights are on solid or blinking. See "Status information " on page 2-3 for more information. If the machine does not have a service error code and does not complete power-on self test (POST), go to the "POST symptom table " on page 2-32. If the machine completes POST without an error, and there is a symptom, go to the "Printer symptom table " on page 2-33. Locate the symptom and take the appropriate action. Diagnostic information 2-1