Lexmark T642 Service Manual - Page 44

4061-xx0 Power-On Self Test (POST) sequence When you turn the printer on, it performs a Power-On Self Test. Check for correct POST functioning of the base printer by observing the following: 1. The LED turns comes on. 2. The operator panel turns on. 3. A partial row of pixels are displayed. 4. The operator panel display clears. 5. Another row of pixels appears. 6. The operator panel display clears again. 7. The operator panel displays system information. For example: *128MB 449MH 8. The fuser lamp turns on. The fuser takes longer to warm up from a cold start than a warm start. 9. The operator panel LED starts blinking. 10. A clock face appears on the display. If present, the following errors or messages may display: • Close Door or Insert Cartridge display if the upper front cover is open or the print cartridge is missing. • Any cartridge errors, such as Defective Cartridge, Prebate Violation, or Missing Cartridge. 11. Ready appears on the display. 12. The main fan turns on. 13. The main drive motor turns on. 14. The developer drive assembly drives the developer shaft in the toner cartridge. 15. The exit rollers turn. 2-4 Service Manual