18
KX-TG3531BXS/KX-TG3531BXB/KX-TG3532BXS/TG3532BXB/KX-TGA351S/KX-TGA351B
4.5.7.
Parallel Connection Detect Circuit
Function:
In order to disable call waiting and stutter tone functions when using telephones connected in parallel, it is necessary to have a
circuit that judges whether a telephone connected in parallel is in use or not. This circuit determines whether the telephone con-
nected in parallel is on hook or off hook by detecting changes in the T/R voltage.
Circuit Operation:
Parallel connection detection when on hook:
When on hook Q136 is ON, the voltage is monitored at pin 86 of IC501. There is no parallel connection if the voltage is
1.65 V or higher, while a parallel connection is deemed to exist if the voltage is lower.
Parallel connection detection when off hook:
When off hook Q136 is OFF, the voltage is monitored at pin 90 of IC501; the presence/absence of a parallel connection is deter-
mined when the voltage changes by 0.2 V or more.
Summary of Contents for KX-TG3531BXB
Page 2: ...2 KX TG3531BXS KX TG3531BXB KX TG3532BXS TG3532BXB KX TGA351S KX TGA351B ...
Page 30: ...30 KX TG3531BXS KX TG3531BXB KX TG3532BXS TG3532BXB KX TGA351S KX TGA351B 4 11 Signal Route ...
Page 38: ...38 KX TG3531BXS KX TG3531BXB KX TG3532BXS TG3532BXB KX TGA351S KX TGA351B 7 4 Error Messages ...
Page 39: ...39 KX TG3531BXS KX TG3531BXB KX TG3532BXS TG3532BXB KX TGA351S KX TGA351B 7 5 Troubleshooting ...
Page 40: ...40 KX TG3531BXS KX TG3531BXB KX TG3532BXS TG3532BXB KX TGA351S KX TGA351B ...
Page 66: ...66 KX TG3531BXS KX TG3531BXB KX TG3532BXS TG3532BXB KX TGA351S KX TGA351B Test Burst Mode ...
Page 73: ...73 KX TG3531BXS KX TG3531BXB KX TG3532BXS TG3532BXB KX TGA351S KX TGA351B ...
Page 74: ...74 KX TG3531BXS KX TG3531BXB KX TG3532BXS TG3532BXB KX TGA351S KX TGA351B 11 1 2 Handset ...
Page 75: ...75 KX TG3531BXS KX TG3531BXB KX TG3532BXS TG3532BXB KX TGA351S KX TGA351B 11 1 3 Charger Unit ...
Page 83: ...83 KX TG3531BXS KX TG3531BXB KX TG3532BXS TG3532BXB KX TGA351S KX TGA351B Memo ...
Page 92: ...92 KX TG3531BXS KX TG3531BXB KX TG3532BXS TG3532BXB KX TGA351S KX TGA351B Memo ...