Chapter 6 _______________________________________________________________ Maintenance 
 
VAISALA _______________________________________________________________________ 201 
9.  Fix a pulling wire (~1m length) to the control cable at the 
receiver/transmitter module side. 
 
   
Figure 64  Pulling Control Cable out of Housing Tube 
10.  Push the module carefully back into the optics head (use the 
opening tool) and simultaneously pull the control cable from the 
center compartment end until the control cable connector is fed into 
the Visibility Sensor housing tube and the receiver/transmitter 
module can be removed 
11.  Pull the receiver/transmitter module carefully out of the Visibility 
Sensor housing head and disconnect the hood thermistor connector 
before final removal. See item #1, Figure 63 on page 200.  
-  Use special tool to unlock the connector arresting mechanism. 
12.  Ensure that the O-Ring of the spare receiver (FSR102)/transmitter 
(FST102) module is firmly placed in its groove as shown in Figure 
65 below.  
 
   
Figure 65  Transmitter/Receiver Module O-Ring 
13.  Insert the spare receiver (FSR102)/transmitter (FST102) module 
and reconnect the hood thermistor connector. 
-  Make sure that the connector locking mechanism has arrested.