Lexmark X502n Service Manual - Page 65

Toner empty sensor (receiver-TTR) service check Step 1 2 3 4 Questions / actions Yes Turn printer off, and 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? Check the following for continuity between engine controller board MCN8 cable and toner empty sensor (receiver-TTR) cable. See "Toner sensor (receiver) removal" on page 4-42 for steps to gain access to sensor cable. Go to step 2. Go to step 3. MCN8 Toner empty sensor sender pin 2 pin 1 pin 4 pin 2 pin 6 pin 3 pin 8 pin 4 pin 9 pin 5 pin 10 pin 6 Also check for shorted pins. Is cable okay? Replace toner empty sensor (receiver-TTR). See "Toner sensor (receiver) removal" on page 4-42 for steps. Retest printer. Does error clear? Problem solved. Replace engine controller board. See "Engine controller board removal" on page 4-34. POR printer. Does error clear? Problem solved. 7100-XXX No Properly connect cable. Retest printer. If error clears, problem solved, otherwise go to step 2. Replace cable. Retest printer. If error clears, problem solved, otherwise go to step 3. Go to step 4. Contact higher level support. Diagnostic information 2-27