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