25
The following table lists typical symptoms and their possible causes.
Symptom
Possible Causes
Luminometer will not
turn on when the
button is pressed
Batteries are low
Batteries are the wrong type
Batteries incorrectly inserted
Luminometer or keypad damaged or faulty
Luminometer will not
turn off when the
button is pressed
Luminometer is busy performing a reading or calibration self-check
operation
Luminometer lockup
– remove the batteries for 30 seconds, then insert them
again
Luminometer or keypad damaged or faulty
Luminometer turns
off unexpectedly
Batteries are low
Batteries are loose within the battery compartment
Luminometer dropped or subjected to shock or vibration
Luminometer not used for 10 minutes and automatically enters standby
mode
Luminometer damaged or faulty
Luminometer beeps
when turned on, but
nothing is displayed
Batteries are low
Luminometer or display damaged or faulty
Clock reverts to
12:00 01/01/2000
Batteries have been replaced
Batteries are low
Batteries are loose within the battery compartment
Luminometer dropped or subjected to shock or vibration
Luminometer damaged or faulty
The display appears
washed out or very
dark
Luminometer is too hot or too cold
LCD contrast incorrectly adjusted (see section
3.9
)
Luminometer is being used in inappropriate lighting conditions
Luminometer or display damaged or faulty
Display segments
missing or garbage
displayed
Display window is dirty
Display window is scratched or dented
Display or luminometer damaged or faulty
Keypad button has
no effect when
pressed
Some buttons only work when selecting particular luminometer functions
Lid not fully closed
Keypad or luminometer damaged or faulty
Luminometer lid will
not close properly or
springs open during
use
Protective pocket incorrectly or not fully inserted
RS232 connector cover is interfering with the lid (see section
6.3
)
Testing device incorrectly or not fully inserted
Lid or luminometer casework damaged
Measurement result
is always zero RLU
or is much lower
expected
Incorrect use of testing device
Luminometer not in upright position when measurement taken
Testing device is out-of-date
Luminometer used in an unstable thermal environment
– turn the
luminometer off and back on
Protective pocket or testing device not fully inserted into luminometer
Protective pocket dirty or severely scratched
Protective pocket damaged
Luminometer damaged or faulty
Measurement result
is higher than
expected
Incorrect or inconsistent use of the testing device
Lid not fully closed
Luminometer used in an unstable thermal environment
– turn the
luminometer off and back on
Luminometer casework or lid damaged or faulty
RS232 interface
does not appear to
be working
Wrong interface cable being used
Cable connector incorrectly inserted into luminometer
Cable connected to wrong port on PC
Wrong PC software being used
PC software incorrectly installed or wrong options selected
Cable or connectors damaged or broken
PC serial port or system software faulty
Luminometer damaged or faulty
