Lexmark T620 Service Manual - Page 69

4069-5XX/7XX Power-On Self Test (POST) 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 comes on. 2. The operator panel displays one and a half row of pels, and then clears. 3. Diamonds scroll across the display, and then clear. 4. The operator panel displays one and a half row of pels, and then clears. 5. The top line of the operator panel displays one square block of pels that turn on one at a time until all sixteen blocks display and then they all turn off. 6. Amount of memory displayed. 7. "Performing Self Test" appears on the display. - The 2000 sheet high capacity option elevator tray moves to the uppermost position (if installed). - The duplex option is checked (if installed). 8. The fuser lamp turns on. The fuser takes longer to warm up from a cold start than a warm start. 9. The main fan turns on. 10. The main drive motor turns on. 11. The developer drive assembly drives the developer shaft in the toner cartridge. 12. "Ready" appears on the display. 13. StapleSmart Finisher option homes (if installed). 14. The exit rollers turn. 15. The output expander option, 5-bin mailbox, or high capacity output stacker exit rollers turn (if installed). Diagnostic Information 2-41