Lexmark C782 Service Manual - Page 113
-sheet drawer option service check, The base printer does not recognize that tray, is installed.
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5061 500-sheet drawer option service check If the paper does not feed from the 500-sheet option, see "Autocompensator service check" on page 2-76. Whenever the 500-sheet tray is removed, use care as the autocompensator may be in its down position which could result in damage to the autocompensator assembly. The tray empty sensor, paper low sensor, and pass thru sensor for any installed tray x (x=2 through 4) can be checked using the "Sensor Test" on page 3-20. The base printer does not recognize that tray x is installed. Step Actions and questions 1 Is tray x the only paper input option that is not recognized? 2 Make sure the printer and any option above tray x is installed correctly. Is the printer and any options installed correctly? 3 Verify correct installation of the lower options autoconnect cable to system board connector J20. Is the cable to J20 installed correctly? 4 Autoconnect cables-check the autoconnect from the printer or option above tray x. Check for cuts, pinched wiring, or damage to the contacts in the connector. Are there any problems with the autoconnect cables? 5 Tray x autoconnect cable-check the tray x autoconnect cable(s) for correct installation at the tray x system board. Are the tray x autoconnect cable(s) connected correctly? 6 Tray x autoconnect cable continuity-Check the continuity of the Tray x Autoconnect cable(s). Is there continuity? 7 Disconnect J20 from the system board, and check the voltages on connector J20 on the system board. Note: All voltages are approximate values: Connector pins Voltage J20-1 +5 V dc J20-2 Ground J20-3 J20-4 J20-5 J20-7 J20-8 Ground +5 V dc +24 V dc +5 V dc +5 V dc Are the voltages correct? Yes Go to step 5 No Go to step 2 Go to step 3 Install the option correctly, and recheck. Go to step 4 Install the cable correctly, and recheck. Repair or replace Go to step 5 as necessary. Go to step 6 Install the cables correctly, and recheck. Go to step 7 Replace electronic size sensing assembly (includes the tray system board). Replace electronic size sensing assembly (includes the system board). Replace the system board. See "System board removal" on page 4-89. Diagnostic information 2-71