User's Guide ________________________________________________________
54 _____________________________________________________ M210283en-A
Miscellaneous Problems
Table 10 Miscellaneous Problems, Causes, and
Remedies
Problem Probable Cause Remedy
Check the cable and
connections.
Dialogue between LM21
and the host computer is
not operating
Check the LMB201 module.
Data message is
missing
Sensor is off or out of
power
If installed into an FS11 system,
check that the power switch is
on, the LEDs on the FSP101
power board are lit, and the
status LED on the interface unit
is blinking. If the mains (AC)
switch is on but no LED is lit,
check the fuses on the FSP101
power board and verify the
presence of a line voltage.
Background
luminance value
missing in the
message
Active alarm (measurement
value not reliable and not
shown)
Check which alarm is active
and remove the cause of the
alarm
Getting Help
For technical questions or for comments on the manuals,
contact the Vaisala technical support:
E-mail helpdesk@vaisala.com
Telephone +358 9 8949 2789
Fax +358 9 8949 2790
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