Xo 4, Troubleshooting Manual, Page: 25 / 88

XO 4 & XO FLEX TROUBLE SHOOTING GUIDE
Version 3.30 25
“POWER DRIVER PCB”:
Purpose:
The “Power driver PCB” is an advanced power supply with its own microprocessor programmed to
provide the required power and voltages, generates also the PWM signal to the water proportional
valve.
Also controls AC motors type OSSEO but not brushless motor type MX2
Failure description Reason Solution
D6 LED is OFF. Failure on the 5V supply from
AN-368 Check the CA-017 Power Driver
cable. For voltage measurements
on J2, refer to “Jumpers
disposition” page 21.
D6 is placed on the opposite
side of the PCB. The reflection of
LED D6 is visible on the plate as
shown in the picture
AO-137 PCB in the bridge AO-137 connections sockets
J4 Connection to J2 on AN368
J5
PWM connection for proportional valve
J8
Connection AO-134 PCB MX2 control Board