Xo 4, Troubleshooting Manual

Page: 67 / 88

XO 4 & XO FLEX TROUBLE SHOOTING GUIDE
Version 3.30 67
The “suction clean” pump V35 is
defective
If the liquid does not flow properly
from the dispenser to the mixing
cup.
Check if the pump V35 connections
are properly inserted (CA-008 cable).
Check if the Cable CA-008 is not
damaged resulting to a short-circuit
Measure the voltage at the coil
connectors 24VDC.
Measure the coil resistance (≈100Ω).
Change if defective (AO-346)
Disassemble and clean the valve at
the piston.
Change the plunger seat gasket
(MR-150).
The liquid sensor pins are misaligned
or defective S11T.
Measure the liquid level in the mixing
cup.
Check that the pins do not touch the
edges of the mixing cup or are short-
circuited.
Consult the chapter
“Liquid Sensor PCB, AP-869” on
page 56.
Replace the liquid sensor PCB (AP-
869)
The water valve V39 is defective Fills the mixing cup with water.
Check if the valve V39 connections
are properly inserted (CA-008 cable).
Check if the Cable CA-008 is not
damaged resulting to a short-circuit.
Measure the voltage at the coil
connectors 24VDC.
Measure the coil resistance (≈100Ω).
Change if defective (UG-800)
Disassemble and clean the valve at
the piston.
Change the plunger seat gasket
(MR-150).
The flush suction cleaning valves
V22 is defective
When the suction changes from
suction hose flushing to direct
suction.
Check if the valve V22 connections
are properly inserted (CA-008 cable).
Check if the Cable CA-008 is not
damaged resulting to a short-circuit
Measure the voltage at the coil
connectors 24VDC.
Measure the coil resistance (≈100Ω).
Change if defective (UG-801)
Disassemble and clean the valve at
the piston.
Change the plunger seat gasket
(MR-150).