Hach SP-510 - Troubleshooting

Remove the two fuses (F1 and F2) and replace them with two new fuses with the same
specifications, T, 1.25 A, 250 V. The same fuse rating is used for the 115 V and for the 230 V
operation. Refer to Figure 10 on page 14.
Troubleshooting
Problem Possible cause Solution
The SOFT LED light is not on and
the pump motor does not operate.
No power
• Make sure that the power switch is set
to on.
• Connect the power cord.
• Replace the fuses if necessary.
The SOFT LED light is not on and
the pump motor does operate.
Problem with the power
supply
Replace the main circuit board. Contact
technical support.
The SOFT LED light is on but the
pump motor does not operate.
Operation power is low Make sure that the line voltage is within
specification.
Voltage selector setting is
not correct
Set the line voltage selector switch to the
correct voltage.
Motor cable is not connected Connect the motor cable connection.
Motor does not operate Replace the motor.
The reading is continually high. The
HARD LED is on.
• No stir bar
• LED is not connected
• No sample flow
• Out of reagents
Refer to Troubleshooting for a hard
reading on page 21. If the problem
continues, cycle power to the instrument,
examine all power connections and fuses,
replace the circuit board or contact
technical support.
The HARD LED is flashing. The instrument could not
save the calibration
information.
Contact technical support.
The instrument could not
save the disabled alarm
status.
The SOFT LED is flashing
continuously for more than 5 minutes
after the power is set to on.
The optical path has a
blockage or the optical
switch does not work.
• Let the instrument complete the cycle.
• Make sure that the motor operates.
• Set the power to off and then to on and
wait for 5 minutes.
• Contact technical support.
Troubleshooting for a hard reading
When the red LED is on continuously and the instrument measures hard water, do the steps that
follow.
English
21