Lexmark C510 Service Manual - Page 135
-Toner empty sensor (receiver-TTR) service check
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5021-0XX 917-Toner empty sensor (receiver-TTR) service check Step Questions / actions Yes No 1 Turn printer off and remove Go to step 2. I/O board shield. See "I/O board removal" on page 4-70 for steps to remove I/O board shield. Is cable properly connected to I/O board connector DCN15? Properly connect cable. Retest printer. If error clears, problem solved, otherwise go to step 2. 2 Turn printer off and replace Problem solved. Go to step 3. I/O board. See "I/O board removal" on page 4-70. Retest printer. Does error clear? 3 Check cable that connects Go to step 4. engine controller board connector I1CN to I/O board connector DCN1 for continuity and pin shorts. Is cable okay? Replace cable. Retest printer. If error clears, problem solved, otherwise go to step 4. 4 Turn printer off and replace Problem solved. Turn printer off engine controller board. and replace See "Engine controller toner empty board removal" on sensor (receiver- page 4-55. Retest printer. TTR). See Does error clear? "Toner sensor (receiver) removal" on page 4-64. Diagnostic information 2-57