907-Toner Empty Sensor P.w.b. Board Service Check - Lexmark C720 Service Manual

5024-001
907—Toner Empty Sensor P.W.B. Board Service Check
FRU
1 Check Connector
2 • Toner Sensor, P.W.B.
Board (LED side)
• IOD1 P.W.B. Board
3 Main Engine (MCTL
P.W.B.) Board
Toner Sensor P.W.B. (LED side)
2-44
Service Manual
Action
Ensure the toner empty sensor (LED)
connector is connected correctly to DCN7
on IOD1 P.W.B. board.
Check the voltage for (LEDON-N/D)
If the voltage jumps to +24V between
DCN7-7 and DCN7-9 on the IOD1 P.W.B.
board, replace the toner sensor P.W.B.
board.
If the voltage drops to less than +24V
between DCN1-15 and DCN1-41 on the
IOD1 P.W.B. board, replace the IOD1
P.W.B. board.
If the error still exists, replace the main
engine (MCTL P.W.B.) board.