Lexmark C750 Service Manual - Page 159
Lexmark C750 Manual
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5060-00x Front door is open, no indication on display Step 1 Action and questions Make sure the front door is activating the cover switch. Is the door activating the cover switch? 2 Check door-door switch activating tab (broken or missing). Is the front door and door activating tab damaged, broken or missing? 3 Check the front door magnetic latches to make sure the front door closes correctly. Are the magnetic latches functioning properly? 4 Check the front door switch cable connection to CN11 on the finisher system board. Is the cable connected correctly? 5 Check the continuity of the front switch as the switch is activated. Do you measure continuity? 6 Check continuity of the front door switch cable. Do you measure continuity? Replace the finisher system board. Replace the front door switch cable D1. Go to step 6 Replace the front door switch. Go to step 5 Install the cable correctly. Go to step 4 Replace the magnetic latches. Replace the front door assembly. Yes Go to step 2 No Repair or replace the door assembly. Go to step 3 Fan in finisher inoperative Step 1 Action and questions Make sure the fan cable, H6, is correctly connected to CN21 on the finisher system board. Is the cable connected correctly? 2 Check the cable H6 connection to the fan assembly. Is the cable connected correctly? 3 Check the voltage between CN21-1 and CN21-2. The voltage measures approximately +24 V dc. Is the voltage correct? 4 Check continuity of the fan cable H6. Do you measure continuity? Replace the fan assembly. Go to step 4 Go to step 3 Install the cable correctly. Replace the finisher system board. Replace cable H6. Yes Go to step 2 No Install the cable correctly. Diagnostic information 2-125