Introduction
This appendix covers the diagnosis of minor faults which may occur from time to
time in the Accessory. It is not intended that the user should undertake major
repairs and any faults not covered should be referred to Malvern Instruments or
their representatives. Further more the user must refrain from carrying out any
procedures not described in this manual and any remedial action requiring such
procedures should only be carried out by qualified personnel.
#
Warning
Fault diagnosis and correction
Fault symptom Corrective action
Motor fails to run. Power is disconnected or off.
On/off switch on the rear panel is off.
Speed control is insufficiently advanced.
Check fuse.
Motor plug is disconnected.
Controller box is switched on before motor is
connected.
No increase in obscuration as sample is
added.
Check for leaks.
Speed control is insufficiently advanced.
High background reading. Clean the cell windows and Dispersion Unit.
Inner detectors (1 to 10) are unexpectedly
high and unsteady.
Entrained air - reduce motor speed or add
dispersant.
Dirt in the system - clean the tank.
Warning message. MS 1 not connected to
I/O socket (Mastersizer X/S only).
Ensure the 37 way cable between the
Controller Unit & the Digital I/O socket on the
Mastersizer is fitted correctly.
Before carrying out any of the procedures described the user must ensure that
the Accessory is disconnected from the mains supply.
APPENDIX C
QS SMALL VOLUME SAMPLE DISPERSION UNIT
Page C.1
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