Reference Manual

Draft
7 Troubleshooting
For further information, consult the XPR Reference Manual (RM).
u www.mt.com/XPR-analytical-RM
7.1 Error symptoms
Error symptoms Possible cause Diagnostic Remedy
The liquid dosing head
does not dispense any
liquid.
The suction filter is
clogged.
Check if there is liquid in
the liquid tube.
Clean or replace the
suction filter.
The dosing head is not
installed properly.
Check if there is a gap
between the dosing head
and the dosing head
holder.
Slightly press the dosing
head down.
Liquid drips from the bottle
cap and/or the dosing
head.
The sealing ring and/or
fastening nut are
damaged.
– Change sealing ring and
fastening nuts at the bottle
cap and/or the dosing
head. See [Replacing the
sealing ring and fastening
nut on the liquid
tube}Page21]
Make sure that the end of
the tube is cut straight.
The pump is not listed as
a device connected to the
balance.
The pump is not properly
connected to the balance.
Check that the USB cables
are not damaged and are
connected properly.
Connect the USB cables
properly.
Replace the USB cables.
The pump is disconnected
from power.
Disconnect the AC/DC
adapter from the pump.
Reconnect it. The indicator
light should blink once
when the device is
connected to power.
Check that the AC/DC
adapter and the power
cable are not damaged.
Exchange the AC/DC
adapter and power cable.
The USB device port on the
balance is damaged.
Disconnect the pump from
the USB port on the
balance. Connect a USB
mouse to the same USB
socket. Verify that a pointer
(arrow) appears on the
terminal and can be
moved by moving the
mouse.
If the mouse pointer does
not appear, contact your
METTLER TOLEDO service
representative.
The pump is damaged or
malfunctioning.
Contact your METTLER
TOLEDO service represen-
tative.
See also
2 Replacing the sealing ring and fastening nut on the liquid tube}Page21
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Troubleshooting 23QLX3 Liquid Module