Lexmark C720 Service Manual - Page 122
—Yellow/Black Developer Solenoid Service Check, Developer Solenoid PSL KY
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5024-001 905-Yellow/Black Developer Solenoid Service Check FRU 1 Check Connector Check Cable Harness 2 Developer Solenoid Assembly (PSL KY/ MC) Front Cover Unit 3 IOD2 P.W.B. Board 4 Main Engine (MCTL P.W.B.) Board Action Ensure the black/yellow solenoid connector ECN5 on the IOD2 P.W.B. board is connected. Ensure the cable harness for the solenoid (PSL KY) is not broken. Replace any damaged parts. Check the voltage at (PSL KY) ON-N. Does the voltage drop below +24V between ECN5-10 and ECN2-6? • If the voltage drops below +24V, replace the DE solenoid assembly. • If this doesn't fix the problem, replace the front cover unit. Check the voltage between ECN1-5 and ECN2-8. If the voltage jumps to +24V, replace the IOD2 P.W.B. board. If the problem still exists, replace the main engine (MCTL P.W.B.) board. Developer Solenoid (PSL KY) 2-42 Service Manual
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