Thermo Fisher Scientific CyberScan PC 300 - Manual (Page 57)

Instruction Manual PC 300
53
9 T R O U B L E S HO O T I NG G UI D E
Problem Cause Solution
Press ‘ON’ key but
no display a) Batteries not in place
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.
Not responding to
key press a) HOLD mode in operation.
b) Damaged key pad.
c) Internal program error.
a) Cancel HOLD mode by
pressing Hold key.
b) Return to dealer.
c) Reset all internal programs
by reinserting batteries.
Unstable readings d) Air bubbles in probe.
e) Dirty probe.
f) Probe not deep enough in
sample.
g) External noise pickup or
induction caused by nearby
electric motor.
h) Broken probe.
d) Tap probe to remove
bubbles.
e) Clean the probe and re-
calibrate.
f) Make sure sample entirely
covers the probe sensors.
g) Move or switch off interfering
motor.
h) Replace probe.
“OR” on upper
display a) Probe is shorted.
b) Probe is in an out-of-range
solution.
c) Broken probe.
a) Test probe. Make sure probe
is fully connected to meter.
b) Use different solution.
c) Replace probe. See
Accessories Section.
Temperature
reading erratic or
lower display reads
“OR” a) Temperature of solution is
out of range. a) Heat or cool solution.
Slow response a) Dirty / Oily probe. a) Clean probe. See “Probe
Care & Maintenance”,
Section 8.