Auto Disconnect Circuit - Panasonic KX-TG2343F Service Manual

KX-TG2343F / KX-TG2343P / KX-TG2343W / KX-TGA233F / KX-TGA233P / KX-TGA233W

15.7. Auto Disconnect Circuit

Function:
This circuit is used to detect the fact that another telephone connected to the same line is OFF-HOOK while the unit is in a receiving
status or OGM transmitting status.
Circuit Operation:
When off hook Q107 is OFF, the voltage of pin50 of IC501 is monitored. If a parallel-connected telephone is put into OFF HOOK
status, the presence/absence of a parallel connection is determined when the voltage changes by 0.2V or more.When the set
detects the parallel-connected telephone is OFF HOOK status, the line is disconnected.
You can enable or disable the Auto Disconnect function.
See Check Record (P.43)
74