Lexmark C720 Service Manual - Page 143

5024-001 991-Transfer Roller Cam Clutch (TRCM) Service Check FRU 1 Check Connector 2 Transfer Roller Cam Clutch (TRCM) 3 IOD2 P.W.B. Board 4 Main Engine (MCTL P.W.B.) Board Action Ensure connectors ECN8 on the IOD2 P.W.B. board is properly connected to the transfer roller cam clutch (TRCM). Ensure ECN1 on the IOD2 P.W.B. board and 12CN on the main engine (MCTL P.W.B.) board are properly connected. Check for +24V between ECN8-4 and ECN2-5 on the IOD2 board. If the voltage is less than +24V, replace the transfer roller cam clutch (TRCM). Check for +24V between ECN2-5 and ECN2-18 on the IOD2 P.W.B. board. If the voltage is less than +24V, replace the IOD2 P.W.B. board. If the problem still exists, replace the main engine (MCTL P.W.B.) board. Transfer Cam Clutch (TRCM) Diagnostic Information 2-63