Xo 4, Troubleshooting Manual, Page: 57 / 88

XO 4 & XO FLEX TROUBLE SHOOTING GUIDE
Version 3.30 57
Fault in air pressure to
instrument bridge
Main air valve V12 is defective Check driver voltage.
Check pressure before and after
valve
Measure valve coil resistance and
replace if faulty, UC-584
Remove coil, disassemble valve and
clean or replace valve plunger.
Air pressure reduction valve is
closed or is defective.
Check pressure setting and change
if defective
No Flush or Rinse Cuspidor flush knob switch not
activated.
Turn cuspidor knob must be turn
clockwise to stop to have water flow.
The cuspidor tap in the unit is
closed.
Check if the water tap is not
completely close in the unit.
(place above V7 Valve)
When chair reaches the
preprogrammed “rinse position”.
Check that there is main water V10 is
working properly
Check that water flows when
activating the “rinse/flushing” knob
on the unit.
If the water flows when pressing the
knob and not when the chair reaches
the preprogrammed “rinse position,
execute a “reset” from the
“technician menu”. Refer to page 13.
If the “reset” does not solve the
issue, do the following.
The “stand Controller” is defective The "Stand Controller" AO-891
controls all valves, level sensors,
pumps, suction and patient chair
signals of the XO unit.
For more information concerning the
“Stand Control AO-891” and its
function, consult page 20 & 21
If the “Stand controller” is working
The cuspidor valve V7 is defective. Measure the voltage on the valve V7
Verify pressure before and after the
valve V7
Measure the valve coil resistance
and replace if defective, UG-800
Remove coil, disassemble valve and
clean or replace valve plunger
The cuspidor switch S37F is
defective.
Measure the switch resistance in
state
- Switch ON
- Switch OFF.
Replace the switch if defective, CA-
037
No cup filling. The cup filler valve V4 is defective Measure voltage on the valve
Verify the pressure before and after
the valve.
Measure the valve coil resistance
and replace it if defective,
AO-778.