a cooling unit to perform a cooling process to lower a temperature of a light source when {HEAD ~ an instruction} for turning off {TAIL ~ the power} of the communication apparatus is received 
for turning off
a cooling unit to perform a cooling process to lower a temperature of a light source when { HEAD ~ an instruction } for turning off { TAIL ~ the power } of the communication apparatus is received
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD REL REL REL TAIL TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH