Follett Symphony 25CT400A Installation, Operation And Service Manual page 22

Lens/sensor troubleshooting
1. Turn dispenser power switch off.
2. Remove splash panel.
3. Disconnect wires from output terminal(s) (WTR, WM) on board.
4. Gently remove appropriate sensor/mounting block assembly from panel by moving block sideways until edge of block
clears retaining tab of panel.
5. Inspect lens and sensor assembly for foreign material and remove using non-abrasive cleaner.
6. Turn dispenser power on and test sensor by moving hands through activation area (no closer than 3/16"/
5mm in front of sensor).
7. If LED on board turns on and off, sensor is working properly and dispenser may be reassembled. If LED does not
come on, switch sensor leads on board and retest. If the opposite LED comes on, board is defective and must be
replaced. If LED does not come on, sensor is defective and must be replaced.
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