Lexmark C510 Service Manual - Page 165
Paper size sensing service check, DCN13 on I/O board.
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Paper size sensing service check 5021-0XX 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 DCN19? Properly connect cable. 2 Reconnect operator panel. Go to step 5. Turn printer on and check for 5 VDC between DCN19 pin 1 and ground (you can touch negative lead of voltmeter to metal bracket that holds I/O board to obtain ground.) Is 5 VDC present? Go to step 3. 3 Disconnect cable from Replace I/O Go to step 4. DCN13 on I/O board. On board. See "I/O cable that connects to board removal" DCN13, check for 5 VDC on page 4-70. between pins 11 and 12. Is 5 VDC present? 4 Check cable continuity Replace LVPS. Replace cable. between LVPS ACN1 and I/ See "Low O board DCN13. Also voltage power check for shorted pins. Is supply (LVPS) cable okay? with cage removal" on page 4-60. Diagnostic information 2-87