Thermo Fisher Scientific EcoScan DO 6 - Manual (Page 64)

Instruction Manual DO 6
56
9 TROUBLE-SHOOTING GUIDE
Problem Cause Solution
No display
when turned
on a) Batteries not in place
b) Batteries not in correct
polarity (+ and –
position).
c) Weak batteries
a) Remove rubber boot/stand. Check
that batteries are in place and
making good contact.
b) Re-insert batteries with correct
polarity.
c) Replace batteries.
Unstable
readings a) Insufficient electrolyte in
probe.
b) Air bubbles trapped
around the probe.
c) Dirty or damaged probe
d) Probe not deep enough
in sample.
e) External noise pickup or
induction caused by
nearby electric motor.
f) Broken probe.
a) Fill probe with electrolyte &
replace pre-membraned cap.
b) Stir or tap probe to remove
bubbles.
c) Clean the probe and re-calibrate.
d) Make sure sample entirely covers
the probe sensors.
e) Move or switch off interfering
motor.
f) Replace probe.
Slow
response a) Dirty / Oily probe.
b) Temperature is
changing.
a) Clean probe. See “Probe Care &
Maintenance.
b) Allow time for temperature to
stabilize
Not
responding
to key press a) HOLD mode in
operation indicated by
flashing display.
b) Damaged key pad.
c) Internal program error.
a) Cancel HOLD mode.
b) Return to dealer.
c) Reset all internal programs by
reinserting batteries.