Replace The Fuse; Troubleshooting - Hach SP-510 Manuel D'utilisation

9.11 Replace the fuse

Electrocution hazard. Remove power from the instrument before doing maintenance or service
activities.
Fire hazard. Use the same type and current rating to replace fuses.
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
Section 10 Troubleshooting
Problem
The SOFT LED light is not on and
the pump motor does not operate.
The SOFT LED light is not on and
the pump motor does operate.
The SOFT LED light is on but the
pump motor does not operate.
The reading is continually high. The
HARD LED is on.
The HARD LED is flashing.
The SOFT LED is flashing
continuously for more than 5 minutes
after the power is set to on.
D A N G E R
D A N G E R
on page 14.
Possible cause
No power
Problem with the power
supply
Operation power is low
Voltage selector setting is
not correct
Motor cable is not connected
Motor does not operate
• No stir bar
• LED is not connected
• No sample flow
• Out of reagents
The instrument could not
save the calibration
information.
The instrument could not
save the disabled alarm
status.
The optical path has a
blockage or the optical
switch does not work.
Solution
• Make sure that the power switch is set
to on.
• Connect the power cord.
• Replace the fuses if necessary.
Replace the main circuit board. Contact
technical support.
Make sure that the line voltage is within
specification.
Set the line voltage selector switch to the
correct voltage.
Connect the motor cable connection.
Replace the motor.
Refer to Troubleshooting for a hard
reading on page 22. If the problem
continues, cycle power to the instrument,
examine all power connections and fuses,
replace the circuit board or contact
technical support.
Contact technical support.
• 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.
English 21