Panasonic KX-TES824UA / KX-TEM824UA / KX-TE82461X / KX-TE82474X / KX-TE82480X / KX-TE82483X / KX-TE82491X / KX-TE82492X / KX-TE82493X / KX-A227X / KX-TES824UAPP / KX-TEM824UAPP Service Manual ▷ View online
4) CALL ID interface circuit
It is insulated by the transformer in a COL circuit, and the call ID signal inputted from outside line is transmitted to a CALLID
option card.
The flow of a CALLID signal
Tip
option card.
The flow of a CALLID signal
Tip
→L1→R2→PC1(1-2)→C3→T2→R5→L1→Ring
Ring
→L1→R5→T2→C3→PC2(1-2)→R2→L1→Tip
5) COL Bidirectional Amplifier circuit
This circuit consists of bidirectional amplifier function for communication between the extensions and COL, returns loss
compensation for conference, shunt function and mute function.
(Composition)
For transmitting signals from the extensions to COL, this circuit consists of R34, R35, R26, R27, R18, R29, C14, C15, C10, C16
and the operational amplifier (IC1).
For transmitting signals from the COL to extensions, this circuit consists of R24, R25, R31, R28, R37, R30, C12, C13, C17, C18,
and the operational amplifier (IC1).
COL side-tone suppression circuit which includes a balanced network BN1 consists of R22 R23, C11 and R16, R17, R20, R21.
EXT side-tone suppression circuit which includes a balanced network BN2 consists of R41, R42 and R40, R43, R38, R39.
Also extension side-tone suppression circuit which includes a balanced network BN3 consists of R45, R46 for supplementing
side-tone suppression during the conference communication.
The analog switch (IC2) is used for the following:
(1) Conference (Pin 6, 8 and 9)
(2) Shunt (Pin 12, 10 and 11)
(3) Mute (Pin 13, 1 and 2)
compensation for conference, shunt function and mute function.
(Composition)
For transmitting signals from the extensions to COL, this circuit consists of R34, R35, R26, R27, R18, R29, C14, C15, C10, C16
and the operational amplifier (IC1).
For transmitting signals from the COL to extensions, this circuit consists of R24, R25, R31, R28, R37, R30, C12, C13, C17, C18,
and the operational amplifier (IC1).
COL side-tone suppression circuit which includes a balanced network BN1 consists of R22 R23, C11 and R16, R17, R20, R21.
EXT side-tone suppression circuit which includes a balanced network BN2 consists of R41, R42 and R40, R43, R38, R39.
Also extension side-tone suppression circuit which includes a balanced network BN3 consists of R45, R46 for supplementing
side-tone suppression during the conference communication.
The analog switch (IC2) is used for the following:
(1) Conference (Pin 6, 8 and 9)
(2) Shunt (Pin 12, 10 and 11)
(3) Mute (Pin 13, 1 and 2)
25
KX-TES824UA / KX-TEM824UA /
1) Conference switch
Normally, pin 6 of the analog switch IC2 is low level, but during conferences, this pin becomes high level. Because, during
conferences, it should compensate the return loss by connecting the balance network BN2 and the balance network BN3 in
parallel.
conferences, it should compensate the return loss by connecting the balance network BN2 and the balance network BN3 in
parallel.
2) Mute switch
The mute switch consists of pin 13, 1 and 2 of the analog switch(IC2). This switch has the following functions.
a) When a dial signal (DP) is sent to the COL, signals from the extensions are blocked.
b) When the hold on music is sent to the COL, signals from the extensions are blocked.
c) When the COL interface circuit is in the idle state, oscillation of COL bidirectional amplifier is inhibited. When pin 13 of IC2
changes to low level, the interval between pins 1 and 2 of the analog switch turns off, and signals are blocked.
a) When a dial signal (DP) is sent to the COL, signals from the extensions are blocked.
b) When the hold on music is sent to the COL, signals from the extensions are blocked.
c) When the COL interface circuit is in the idle state, oscillation of COL bidirectional amplifier is inhibited. When pin 13 of IC2
changes to low level, the interval between pins 1 and 2 of the analog switch turns off, and signals are blocked.
3) Shunt switch
The shunt switch consists of pin 12, 10 and 11 of analog switch IC2.It is used to prevent the pulse dialing signal which is
transmitted to the extensions. When pin 12 of IC2 changes to high from low, the analog switch becomes ON (the interval
between pin 10 and 11), and GAIN of the COL cross point operational amplifier becomes zero.
transmitted to the extensions. When pin 12 of IC2 changes to high from low, the analog switch becomes ON (the interval
between pin 10 and 11), and GAIN of the COL cross point operational amplifier becomes zero.
Shunt SW
Mute SW
Conference SW
pin no. of analog switch
12
13
6
No connection (idle)
H (on)
L (off)
L (off)
Two party call
L (off)
H (on)
L (off)
Conference
L (off)
H (on)
H (on)
Hold on music transmission
L (off)
H (on)
L (off)
Condition of COL interface amplifier circuit and analog switches.
26
KX-TES824UA / KX-TEM824UA /
11.3. CROSS POINT SWITCH CIRCUIT
11.3.1. Composition
The cross point circuit composed of three cross point switch IC´s (IC600 and 601:8X16, IC602:4X8).
*In case of KX-TEM824, the system add more cross point switch IC´s (IC500:8X16, IC501:8X8, IC502:4X8) which are in KX-
TE82483.
1) Cross Point Switch IC Operation
*In case of KX-TEM824, the system add more cross point switch IC´s (IC500:8X16, IC501:8X8, IC502:4X8) which are in KX-
TE82483.
1) Cross Point Switch IC Operation
The cross point SW (IC600, IC601) contains a 8X16 array of cross point switches along with a 7 to 128 line decoder and latch
circuits. Any one of the 128 switches can be addressed by selecting appropriate seven address bits. The selected switch can
be turned on or off by applying either logical one or zero to the DATA input. Chip select allows the cross point array to be
cascaded for matrix expansion. Start a new line at this point SW´s (IC602) contain 4X8 array of cross point switches along with
a 5 to 32 line decoder and latch circuits.
Any one of the 32 switches can be addressed by selecting appropriate five address bits. The selected switch can be turned on
or off by applying either logical one or zero to the DATE input. Chip select allows the cross point array to be cascaded for matrix
expansion.
circuits. Any one of the 128 switches can be addressed by selecting appropriate seven address bits. The selected switch can
be turned on or off by applying either logical one or zero to the DATA input. Chip select allows the cross point array to be
cascaded for matrix expansion. Start a new line at this point SW´s (IC602) contain 4X8 array of cross point switches along with
a 5 to 32 line decoder and latch circuits.
Any one of the 32 switches can be addressed by selecting appropriate five address bits. The selected switch can be turned on
or off by applying either logical one or zero to the DATE input. Chip select allows the cross point array to be cascaded for matrix
expansion.
27
KX-TES824UA / KX-TEM824UA /
28
KX-TES824UA / KX-TEM824UA /
Click on the first or last page to see other KX-TES824UA / KX-TEM824UA / KX-TE82461X / KX-TE82474X / KX-TE82480X / KX-TE82483X / KX-TE82491X / KX-TE82492X / KX-TE82493X / KX-A227X / KX-TES824UAPP / KX-TEM824UAPP service manuals if exist.