Chapter 6 ________________________________________________ Maintenance
VAISALA__________________________________________________________49
Replacing the Measurement Board LMB201
CAUTION
The servicing of the equipment must be performed by
qualified personnel only.
CAUTION
The mains (AC) power switch and the optional battery
backup switch must always be turned off before attempting
any service actions described in this section.
NOTE
When replacing the LMB201 board, do not let water or
moisture to enter the unit.
NOTE
LM21 has to be calibrated after changing the LMB201
Luminance Measurement Board. If the LM21 Field
Calibrator LMA21 is not available for this, the entire
LMM101 assembly has to be replaced, instead.
Order a spare measurement board with the code LMB201
from Vaisala or its nearest representative. To replace the
LMB201 board, follow the instructions below:
1. Disconnect the power from LM21 by disconnecting it
from the power supply.
2. Open the four screws on the cover frame assembly of
LM21.
3. To avoid damaging the calibrator connector inside the
measurement head, gently open the left side (with the
label) of the LMM101 assembly and lift it upwards
pulling out the assembly together with the attached
measurement board. Disconnect the signal and power
cable from the board. See Figure 10 on page 43.
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