Section 6 Troubleshooting - Hach SP-510 Instrument Manual

SECTION 6
Symptom
Display does not light and the pump motor is not operating
Display does not light and the pump motor operates.
Display lights and the pump motor does not operate.
Reading continually High (Hard)
LED Hard Flashing
LED Soft Flashing continuously (for more than 5 minutes) after power-up
TROUBLESHOOTING
In the event the instrument should malfunction, the following troubleshooting
guide may be used to help isolate the problem. Please contact the nearest
Hach Service Center for assistance or shipping instructions if the instrument
should be returned.
Table 21 supplies troubleshooting information for the instrument. After
determining the symptom and probable cause, perform the corrective action steps
in the order given.
Table 21 Troubleshooting Guide
Probable Cause
No operating power
Problem with power supply
Low operating power
Incorrect line voltage selector switch setting
Motor cable not connected to the circuit board
Defective motor
Stir bar not installed
LED not plugged in
Sample not flowing
Out of reagents
Problem saving calibration information to
non-volatile memory
Problem saving alarm disabled status to
nonvolatile memory
Optical path blocked or optical switch not
working
Corrective Action
Check power switch position, fuse, and power
cord connections.
Replace the circuit board.
Verify the line voltage is within specifications.
Check the line voltage selector switch position.
Check the motor cable connection.
Replace motor.
Install stir bar.
Check through view port for orange light.
Turn sample on.
Check sample connections.
Check sample conditioning filter for blockage.
Replace reagents.
Contact Hach Service Department.
Contact Hach Service Department.
Allow the instrument to complete the cycle.
Determine if the motor is running.
Cycle Power, wait 5 minutes.
Contact Hach Service Department.
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