Lexmark C720 Service Manual - Page 144

5024-001 992-Drum Cleaner Brush Cam Clutch (FBCM) Service Check FRU 1 Check Connector 2 Drum Cleaner Brush Cam Clutch (FBCM) 3 IOD2 P.W.B. Board 4 Main Engine (MCTL P.W.B.) Board Action Ensure the drum cleaner brush cam clutch (FBCM) connector and ECN10 on the IOD2 P.W.B. board are properly connected. Ensure ECN1 on the IOD2 P.W.B. board is connected to 11CN on the main engine (MCTL P.W.B.) board. Check for +24V between ECN10-4 and ECN2-5 on the IOD2 P.W.B. board. If the voltage is less than +24V, replace the drum cleaner brush cam clutch. Check for +24V between ECN1-17 and ECN2-5 on the IOD2 P.W.B. board. 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. Drum Cleaner Brush Cam Clutch (FBCM) 2-64 Service Manual