Lexmark X500n Service Manual - Page 59

7100-XXX Erase lamp service check Step 1 2 3 4 5 6 Questions / actions Yes No Turn printer off, and remove toner cartridges and photodeveloper cartridge. Check erase lamp cable for proper connection. Is erase lamp cable properly connected? Check erase lamp for any visible damage. Is erase lamp damaged? Set multimeter to check diodes. Looking at erase lamp through front cover, touch meter positive lead to left LED connection and meter negative lead to right LED connection. LED should illuminate. Check all LEDs on erase lamp board. Do any LEDs fail to illuminate? Remove engine controller board shield. See "Engine controller board removal" on page 4-34 for steps to remove engine controller board shield. Is cable properly connected to engine controller board connector MCN8? Disconnect cable from erase lamp and engine controller board MCN8. Check for continuity between cable pin that corresponds to MCN8 pin 11 and erase lamp cable connector pin 3. Also check for continuity between cable pin that corresponds to MCN8 pin 12 and erase lamp cable connector pin 1. Check for shorted pins on both sides of cable. Is cable okay? Retest printer. Does error clear? Go to step 2. Properly connect erase lamp. Retest printer. If error clears, problem solved, otherwise go to step 2. Replace erase lamp. See "Erase lamp removal" on page 4-20. Retest printer. If error clears, problem solved, otherwise remove toner cartridges and photodeveloper cartridge and go to step 3. Go to step 3. Replace erase lamp. See "Erase lamp removal" on page 4-20. Retest printer. If error clears, problem solved, otherwise go to step 4. Go to step 4. Go to step 5. Properly connect cable. Retest printer. If error clears, problem solved, otherwise go to step 5. Replace engine controller board. See "Engine controller board removal" on page 4-34. Go to step 6. Replace cable. Retest printer. Go to step 6. Problem solved. Contact higher level support. Diagnostic information 2-21