Thermo Fisher Scientific CyberScan CON 400 (For units manufactured from March 2010 onwards) - Manual (Page 47)

Instruction Manual CON 400
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9 TROUBLE SHOOTING GUIDE
Problem Cause Solution
No display when
turned ON a) Batteries not in place or
battery housing is not
attached to meter correctly
b) Batteries not in correct
polarity (+ and – position).
c) Weak batteries
a) Check that batteries are in
place and making good
contact.
b) Re-insert batteries with
correct polarity.
c) Replace batteries.
Unstable readings a) Air bubbles in probe.
b) Dirty probe.
c) Probe not deep enough in
sample.
d) External noise pickup or
induction caused by nearby
electric motor.
e) Broken probe.
f) probe guard not in place
a) Tap probe to remove
bubbles.
b) Clean the probe and re-
calibrate.
c) Make sure sample entirely
covers the probe sensors.
d) Move or switch off
interfering motor.
e) Replace probe.
f) Attach probe guard
Slow response a) Dirty / Oily probe. a) Clean probe. See “Probe
Care & Maintenance”, page
40.