Xo 4, Troubleshooting Manual, Page: 20 / 88

XO 4 & XO FLEX TROUBLE SHOOTING GUIDE
Version 3.30 20
“STAND CONTROLLER PCB”
The "Stand Controller PCB" controls all valves, level sensors, pumps, suction and patient chair signals
of the XO unit. Converts and manages all incoming / outgoing signals transmitted from or to the Bridge
PCB.
"Stand Controller PCB":
- Can only be positioned in the leftmost position on the Backplane PCB
- Equipped with a fuse F1 (ML-600).
- Yellow LED D29 indicates that 24VDC is available in the unit stand
- Provides power to the LED XO OP Light
- Stand controller PCB firmware can be updated via RS-485 bus
Failure description Reason Solution
D29 LED is OFF (24VDC) Fuse F1 on Stand Controller is
blown Replace fuse F1, 2A Nano type
fuse ref. ML-600.
SENSORS VALVES AND PUMPS
S5 LEVEL DETECTOR FOR BACKFLOW PREVENTION V4 CUP FILLER
S5B LEVEL DETECTOR FOR WATER CLEAN V7 CUSPIDOR FLUSH
S11B MIXING CUP LOW LEVEL DETECTOR FOR SUCTION CLEAN V39 WATER FLUSH / SUCTION CLEAN
S11T MIXING CUP HIGH LEVEL DETECTOR FOR SUCTION CLEAN V10 MAIN WATER VALVE
S14 LEVEL DETECTOR FOR WATER CLEAN V12 MAIN AIR VALVE
S15 LEVEL DETECTOR FOR SUCTION DISINFECTION V16 SMALL SUCTION Ø11
S33 WATER LEAK SENSOR V17 LARGE SUCTION Ø16
S37C CUP FILLER SWITCH V22 SUCTION CLEAN VALVE
S37F CUSPIDOR SWITCH V27 WATER CLEAN
S38 SUCTION CLEAN SWITCH V30 PRESSURISATION CONTAINER VALVE
S41 CUSPIDOR FLUSH SWITCH V31 WATER CLEAN PUMP
V35 SUCTION CLEAN PUMP
Before replacing the “Stand Control AO-891”, always check the fuse F1 state.
Check and probe the cables controlling the 24V to detect any short circuits.
Below is a list of the faults connected to the “Stand Control PCB AO-891”.