XO 4 & XO FLEX TROUBLE SHOOTING GUIDE
Version 3.30 47
suspension PCB lights on when
the suspension is pulled.
Replace AN-510 PCB or AO-988
for Satelec with Light.
The instrument bridge PCB is
defective.
Change “Bridge PCB AN-368”.
The scaler is active while
the suspension cord is not
pulled
The magnet not aligned or not
correctly placed in the field of the
hall contact.
Check that the magnet is present
and properly aligned. If the
magnet is missing, change the
If not aligned, check that the
screws on the suspension
bearing bracket are secure.
Suspension cable is not mounted
properly or is defective.
Check that the CA-101 cable
connecting the AN-368 PCB to
the AN-510 board is properly
when the pedal is activated
The foot control switch is
defective (only if it is not possible
to change the speed setting on
the screen by moving the throttle
Refer to section: Foot control.
Suspension cable is not mounted
properly or is defective.
Check that the CA-101 or CA-
109 (EMS No Pain) cable
connecting the AN-368 PCB to
the AN-510 board is properly
defective.
Replace the “Suspension” PCB
(AO-318 / AO-328) AO-988 for
Set the scaler to maximum
amplitude in the dentist menu
Activate the pedal to the left,
measure the voltage is approx.
24VAC between pin 5 and 6 on
Still on Jumper J5, measure
voltage between pin 4 “analog
control” and 3 “GND”. By
activating the pedal, the voltage
varies from 0 to 5V. 5V at most.
If the voltage remains at 0V,
replace the generator.
If the 24VAC and analog control
are working correctly.
Measure the frequency between
pin 1 and 4 (still on J5); it can be
measured correctly with a
voltmeter with the option (Hz).
Activate the scaler by pulling on
the cord.
Activate the pedal to the left to
check that the frequency is
increasing. The frequency for
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