Chapter 8 ___________________________________________________________________ Repair
VAISALA ______________________________________________________________________ 115
16.
Give the
status
command and check from the status message
that the measured outlaser is close (±5 %) to the new outlaser
value. Also check that the system status is OK and there are no
suspect LRUs.
The ceilometer unit should now return to normal operation. Verify
that the unit is working properly and that there are no other failures
with the system. If other failures exist, separate troubleshooting may
be necessary.
Replacing Modem Module DMX501 (Optional)
CAUTION
Servicing the equipment must only be performed by qualified
maintenance personnel.
Always replace the modem module indoors.
To replace Modem Module DMX501, you will need a screwdriver.
Then proceed as follows:
1.
Open the front door of the ceilometer enclosure and switch the
power off with all three switches (F1, F2, and battery). For the
location of the switches, refer to Figure 18 on page 98 and
Figure 19 on page 99.
WARNING
Disconnect the CT3839 power cable before continuing!
2.
As the DMX501 module is located on the CLE311 board, you
will have to remove the CLE311 board to get to the DMX501
module. Remove the CLE311 board by detaching the cables
connected to it and loosening the hand screws. For details, refer
to steps 3 to 5 in section Replacing Ceilometer Engine Board
CLE311 on page 100.
3.
Ground yourself before touching the DMX501 module. You can
do this, for example, by touching a conductive part of the
equipment chassis with your other hand before touching the
DMX501 module.
