14 ISSUE NO. V1.3 DATE 12/12/00
14
8. Warning Messages
Message Action
Light level too low Ensure that the sample chamber is empty and the sample chamber windows are clean
Light level too high Check that the correct type lamp has been fitted, run the diagnostic routine then contact your
Lovibond distributor
Lamp failure Replace lamp
Stepper motor fault Run diagnostic routine then contact your Lovibond distributor
Sample too dark Use a shorter path length cell
E (on end of chlorophyll result) This is an estimated result. Use a shorter path length cell.
9. Maintenance
Fault finding and diagnostics
The Lovibond PFX995/950 instruments are designed with only a single moving part and a range of thoroughly tested components that
should give long, trouble-free service.
Users are notified of lamp failure by means of a message on the display.
LAMP FAILURE!! Switch off Instrument and replace lamp
Replace the lamp following the instruction given in
‘Replacing spare parts’.
If the instrument gives erratic readings, check that the glass windows in the sample chamber and the sample cell are clean and that the
sample shows no sign of turbidity. Carry out a checking measurement as detailed in
‘Checking measurements’
. If the Lovibond
PFX995/950 continues to give erratic readings, run the diagnostic routine as follows:
Ensure that a printer is connected to the Lovibond PFX995/950 and that it is switched on.
Press
[Menu]
Select menu item
Scale Options Interfaces
^ ^ ^ ^
Select
[Interfaces]
Select menu item
Date/Time Language Diagnostics Printer
^ ^ ^ ^
Select
[Diagnostics]
Start diagnostic test
Press any key to continue (ESC to cancel)
^ ^ ^ ^
Follow the instructions as presented on the display. First of all the instrument will conduct a keypad test; press each key on the keypad
as requested. The instrument will then perform a series of tests - stepper test, ADC test, lamp test, and filter test - that require no user
intervention. The test results are then automatically output to the printer.
Please send or fax the test results to Tintometer Ltd or your Lovibond distributor for diagnosis.
Note: Always unplug the instrument from the power supply before opening the case.
Replacing spare parts
The lamp
The expected lamp life is 600 000 measurements before failure. When replacing the lamp, always
unplug the instrument from the power supply. Undo the two thumbscrews and remove the lamp
block. Unscrew the lamp from the block and replace with the new lamp.
Do not touch the glass
lens on the lamp, as fingerprints will impair its performance
. Replace the lamp block and
tighten the thumbscrews.
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