NO.

Fault

Reason

Solve

1

No laser output

Laser Power supply problems

Check both ends of the laser tube metal clip is

off; check laser power input and output lines

2

Laser output

&testing are

not stable

Power supply voltage is too low, or

voltage instability

Plus AC power supply, stable power output

3

Optical spot is not round

Optical element offset

Adjust optical path

4

No dispersion medium in sample cell

Put dispersion into windows cell. Then check

5

Background

1st level signal

is too strong

Optical alignment shifted

open the cover, then lightly

adjust detector

6

Individual signal beating is not stable when testing

Outside interference,

loose connectors,

earth wire and power wire are twining

1) The other appliances than 1 meter away

2)Check the grounding reliability and ground wire

position

3)check if connect between the signal cable and

plug-in

7

Background signal discontinuities

Probe connectors loose

Check probe connectors

8

NO Ultrasonic

Keyboard/button failure

Fuse off,

Electrical components burn

1)Checking Ultrasonic button,

2)Change ultrasonic fuse

3)Check if electrical components working

9

NO Stir

Keyboard failure,

Fuse off,

Electrical components burn

1)Checking Ultrasonic button,

2)Change ultrasonic fuse

3)Check if electrical components/power supply wire

 working

10

No Circulation or not smooth

Gas is not drained

Intermittent start circulating pump, remove the pump

air

11

Accumulation of particles in the pump

Turn on the pump housing clean and reset the pump

chamber

12

Circulation pump not working,

or big noise

Head wear serious, leading to increased friction during rotation

Replace the new pump head, regular wash cycle

pump

13

No Communication

Communication port, communication cable fault

Check the communication cable and plug, or

replace communication port

14

Background signal too high

Sample cell pollution

Cleaning sample cell according to manual

15

No Concentration shows when test

No good test for background

Sample cell pollution

Re-test background

Cleaning sample cell according to manual

16

Test results are not stable

Preheating time is too short

Extend preheating time to 15 minutes

Power and voltage are fluctuation

Plus AC to stable

Sample dispersion is not sufficient;

low concentration

Extended ultrasonic time, Plus dispersant;

Appropriate to increase the concentration

Signal interference

Exclude interference source; check the ground

17

Low accuracy for testing results

Wrong gears

check if gears is match with measurement range

Samples cell position shift

Re-calibration sample cell position

Sample distribution over the range

Choose the right gear

18

Laser output

becomes weak,

Spot is not

round 

Too much dust particles in the optical parts

Clean optical heads according to the manual