Xo 4, Troubleshooting Manual, Page: 69 / 88

XO 4 & XO FLEX TROUBLE SHOOTING GUIDE
Version 3.30 69
Failure description Reason Solution
Suction does not start when
one of the suction hoses is
lifted but suction motor
starts.
The suction tubes are not place
on the correct valve In the instrument Bridge:
Check the connections on pin
"J8 - Suction detection".
Suction Chair:
Check the connections on pin
J100 in the chair.
See the diagram below.
"D100 - Signal Suction"
Lift the two suction hoses, if the
suction starts, it indicates that
the two blue tubes are not
mounted on the correct valves
V17 and V16. Place the tube
from V17 on the valve V16 and
vice versa.
Verify that the suction starts
when lifting the hose.
Suction starts when the unit
is switched on
Sensor detection range is not
properly adjusted Remove the cover from the
suction holder and check that all
4 LEDs are lit. See table down
below.
Adjust the sensitivity range by
adjusting the potentiometers R50
and R51.
Not possible to adjust the
detection properly Defect potentiometers
Change AO-989 PCB
The “Stand Controller” PCB is
defective Following a polarity reversal or
short circuit due to a cable break
in the suction arm, the sensors
burn; Change the “Stand
Controller” PCB AO-981.
No suction: (Valves
activated / spittoon valve /
CAS1 / Amalgam separator
activated)
The suction motor does not start Check that the suction system
motor is power properly
Check that the activation cable
of the suction motor is correctly
connected to pin J21
Connection Diagram
Suction – Not Active Suction – Active
D1 ON D1 ON
D2 OFF D2 ON
D3 ON D3 ON
D4 ON D4 ON
D5 OFF D5 OFF
D6 ON D6 OFF