Panasonic KX-TS3282B, Service Manual

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(Holding)
If the Hold key is pressed during a conversation using the handset or the speakerphone, the CPU
IC801 judges that a hold status has been applied, consequently pin 67 (pin 65) of IC801 becomes
High level, and PC4 (PC3) goes ON.
Q132 and Q133 (Q232 and Q233) goes ON, and Q134 (Q234) goes ON, and the line voltage is held.
(Hold Cancellation)
If parellel-connected KX-TS3282 is put into an OFF-HOOK status during a hold status. When the
signal indicating that the KX-TS3282 connected in parallel is in off-hook condition causing the
hold status to be canceled.
At this time, LED goes out.
12.8. Intercom
12.8.1. Principle of Operation of two-line Intercom
As shown above, one (Line 1) of the two telephone lines is also used as the intercom line, and the
data signals consisting of
the FM-modulated audio signal and the tone burst signals are transmitted to the line.
There is no distinction among 8 sets when using them as the master unit or the slave unit. If a set
is used to call the other party,
for example,
No.1 call to No.3 , then No.1 become “Master”.
No.3 become “Slave”.
The Master unit use 370 kHz for transmission to Slave unit, and the Slave unit use 440 kHz for
transmission.
In the idle mode when all units are waiting, each unit is used Data (455 kHz) for checking a status.
In short, it is for watching the other units, for example busy mode or intercome mode etc.
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