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System Alarms
54400_trouble.fm
Section 4
4.2 System Alarms
An alarm message is displayed and the instrument ceases to function
normally when a System Alarm is activated. Resolve the alarm to resume
normal operation.
Table 5 System Alarms
Alarm
What the Alarm Indicates
Alarm Display and
Instrument Indication
Resolution
EE Error
Inability to write to the EE ROM
EE ERROR
Press the
EXIT
key to restart the instrument.
If the problem recurs, the main circuit board
may need to be replaced.
Call Hach Service.
A2D Error
Reference measurement = 0
A/D counts
Indicates that the colorimeter is
reading zero light throughput. So it is
likely the photo detector/analog to
digital converter is faulty.
A/D ERROR - EXIT TO
RESTART
Alarm LED is lit
Press the
EXIT
key to restart the instrument.
If the problem recurs, there is a problem
with the colorimeter. The connector
between the instrument and the colorimeter
may not be making a proper connection.
Remove the colorimeter, inspect the
connector pins and straighten the pins if
necessary. Reinstall the colorimeter. If the
problem remains, replace the colorimeter.
LED
Failure
The colorimeter’s photo detector is
reading an extremely low level of light
for the reference reading (less than
100 A/D counts).
LED ERROR - EXIT TO
RESTART
Alarm LED is lit
Press the
EXIT
key to restart the instrument.
If the problem recurs clean the sample cell.
If the problem is not yet resolved, remove
the plug from the colorimeter’s sample
viewing port. You should be able to observe
a green light. (You must wait several
minutes from instrument turn on for the
light to come on.) It will remain on
continuously thereafter. If the light does not
come on and the colorimeter has just been
removed and re-inserted, the colorimeter
connector is not making a proper
connection. Remove the colorimeter and
inspect the connector pins. If the pins are
bent, straighten them and reinsert the
colorimeter. If the problem still remains,
replace the colorimeter.
Contact Hach Service.
Motor
Failure
Indicates that the pump motor’s home
position flag was not detected.
MOTOR ERROR - EXIT
TO RESTART
Alarm LED is lit
Press the
EXIT
key to restart the
instrument. If the problem recurs, check the
following. If the motor does not turn when
the instrument is turned on, try the
following:
1. Check that the motor is plugged into the
main circuit board.
2. Replace the motor.
3. Replace the main circuit board.
If the motor does run and the motor coupler
is turning, try the following:
1. Check that the optical switch is properly
plugged into the main circuit board and the
switch is properly located in the chassis.
2. Replace the optical switch.
3. Replace the main circuit board.
SCR Error
The Cycle Motor does not turn off at
the appropriate time, resulting in a
short total cycle time.
SCR ERROR - EXIT TO
RESTART
Alarm LED is lit
Press the
EXIT
key to restart the
instrument. If the problem recurs, replace
the main circuit board.
Summary of Contents for 54400-18
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