Vaisala LT31 - Page 263

Chapter 7 ___________________________________________________________ Troubleshooting
VAISALA ______________________________________________________________________ 263
A7:Window
Contamination
Measurement;
contamination too
high
Measured window contamination
is high.
Cleaning of optical surfaces is necessary
(refer to see section Cleaning Instructions
on pag
e 194).
A8:Window
Contamination
Measurement;
contamination
measurement error
An error occurred during window
contamination measurement.
Reset LT31 system (refer to Table 11 on
page 150) and perform an Offset and
Visibility Cali
bration (see section Offset and
Visibility Cali
bration on page 234).
A9:Alignment;
automated alignment
in progress
The Alignment Menu has been
entered at maintenance port.
-
A10:Alignment;
reduced quality
level 1
Alignment quality has been
evaluated to be below level 1.
Fine Alignment might be carried out in mid-
term range (see section Alignment on page
225). LT31 system is able to cope this
situation.
A11:Alignment;
reduced quality
level 2
Alignment quality has been
evaluated to be below level 2.
Fine Alignment has to be carried out in
short-term range (see section Alignment on
page 225). LT31 system is able to cope this
situation.
A12:Alignment;
reduced quality
level 3
Alignment quality has been
evaluated to be below level 3.
Raw and Fine Alignment has to be carried
out (see section Alignment on page 225).
A13:Alignment;
alignment procedure
error
An error occurred during
alignment quality evaluation.
Check if Synchronization Signal is valid.
Check if movement of all axes is possible
and position values are valid (see section
Service on page 250).
A14:Receiver Main
Receiver LTD112;
self-test in progress
Preconditions for main receiver
self-test are valid. Main receiver
self-test is in progress.
–
A15:Receiver Main
Receiver LTD112;
self-test failed (no
reaction on test LED)
Main receiver self-test failed. Replace Main Receiver Module (see
section Replacing Main Receiver Module
on pag
e 218).
A16:Receiver Main
Receiver LTD112;
sensitivity is low
Main receiver self-test has
detected low sensitivity for main
receiver.
Replacement of Main Receiver Module
should be taken into account (see section
Replacing Main Receiver Module on page
218). LT31 system is able to cope this
situation