Panasonic KX-TS2368RUW Service Manual ▷ View online
9.6. Hold Circuit
9.6.1. Function
The HOLD circuit holds the line from the talk condition.
The green LED light at the time of holding.
The green LED light at the time of holding.
9.6.2. Circuit Description
·
Hold on
When line 1 [line 2] is selected with HOLD switch and the handset is off-hook, Q508 [Q560] goes ON and IN USE LED
D803-R [D805-R] lights. At this time, C507 [C557] is charged. When the Hold key is depressed, Q501 [Q551] is triggered
and the hold circuit comes on.
R118
When line 1 [line 2] is selected with HOLD switch and the handset is off-hook, Q508 [Q560] goes ON and IN USE LED
D803-R [D805-R] lights. At this time, C507 [C557] is charged. When the Hold key is depressed, Q501 [Q551] is triggered
and the hold circuit comes on.
R118
→
D103
→
C507 [C557] is charged. When the Hold key is depressed, current flows as follows
→
C507 [C557]
→
SW110 [SW120]
→
SW510 [SW510]
→
D509 [D559]
→
R505 [R555]
→
Q502 [Q552] ON.
At this time, the LED D803-R [D805-R] for the IN USE indicator goes out and green LED D803-G [D805-G] for Hold
indicator lights.
indicator lights.
Q501 [Q551] collector
→
D803-G [D805-G] ON.
·
Hold Cancellation
When the line select switch is pressed ON and the voltage drops because of the handset going off-hook or another
telephone connected in parallel has been raised (off-hook), Q504 [Q554] goes OFF
When the line select switch is pressed ON and the voltage drops because of the handset going off-hook or another
telephone connected in parallel has been raised (off-hook), Q504 [Q554] goes OFF
→
Q503 [Q553] goes OFF
→
Q502
[Q552] goes OFF, and hold is cancelled.
[ ] : in case of Line2
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KX-TS2368RUW
9.7. Speakerphone Circuit
9.7.1. Function
The circuit controls the automatic switching of the transmitted and received signals, to and from the telephone line, when the
unit is used in the hands -free mode.
unit is used in the hands -free mode.
9.7.2. Circuit Operation
The speakerphone can only provide a one-way communication path.
In other words, it can either transmit an outgoing signal or receive an incoming signal at a given time, but cannot do both
simultaneously. Therefore, a switching circuit is necessary to control the flow of the outgoing and incoming signals.
This switching circuit is contained in IC601 and consists of a Voice Detector, TX Attenuator, RX Attenuator, Comparator and
Attenuator Control. The circuit analyzes whether the TX(transmit) or the RX(receive) signal is louder, and then it processed the
signals such that the louder signal is given precedence.
The Voice Detector provides a DC input to the Attenuator Control corresponding to the TX signal.
The Comparator receives a TX and a RX signal, and supplies a DC input to the Attenuator Control corresponding to the RX
signal.
The Attenuator Control provides a control signal to the TX and the RX attenuator to switch the appropriate signals on and off.
The Attenuator Control also detects the level of the volume control to automatically adjust for changing ambient conditions.
1. Transmission signal path:
In other words, it can either transmit an outgoing signal or receive an incoming signal at a given time, but cannot do both
simultaneously. Therefore, a switching circuit is necessary to control the flow of the outgoing and incoming signals.
This switching circuit is contained in IC601 and consists of a Voice Detector, TX Attenuator, RX Attenuator, Comparator and
Attenuator Control. The circuit analyzes whether the TX(transmit) or the RX(receive) signal is louder, and then it processed the
signals such that the louder signal is given precedence.
The Voice Detector provides a DC input to the Attenuator Control corresponding to the TX signal.
The Comparator receives a TX and a RX signal, and supplies a DC input to the Attenuator Control corresponding to the RX
signal.
The Attenuator Control provides a control signal to the TX and the RX attenuator to switch the appropriate signals on and off.
The Attenuator Control also detects the level of the volume control to automatically adjust for changing ambient conditions.
1. Transmission signal path:
The input signal from the microphone is sent through the circuit via the following path:
MIC
MIC
→
IC601 (9
→
10
→
3
→
4)
→
R601
→
C602
→
Q108
→
Tel line.
2. Reception signal path:
Signals receive from the telephone line are outputted at the speaker via the following path:
Tel line
Tel line
→
Q108
→
Q109
→
C112
→
R600
→
C603
→
IC601 (27
→
26
→
19
→
15)
→
Speaker.
3. Transmission/Reception switching
The comparison result between TX and RX outputs as a DC level of IC601 (25), In short the voltage difference between
IC601 (20) and IC601 (25) switches TX/RX.
IC601 (20) and IC601 (25) switches TX/RX.
4. Voice detector
The output of the Mic Amp (IC601 (10)) is supplied to IC601 (13) as a control signal for the voice detector.
5. Attenuator control
The attenuator control detects the setting of the volume control through IC601 (24) to automatically adjust for changing
ambient conditions.
ambient conditions.
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KX-TS2368RUW
10 HOW TO SET THE FLASH TIME AND REDIAL TIME
*Refer to Flow Solder Side View (Operation) (P.48)
10.1. Flash Time
D801D804 are used for default setting.
When you change the flash time, do the following procedure.
In case the program should be set frequency, change the default at D801D804, then set the program.
When you change the flash time, do the following procedure.
In case the program should be set frequency, change the default at D801D804, then set the program.
0= Without
1= With
1= With
10.2. Redial Time
0= Without
1= With
1= With
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KX-TS2368RUW
11 IC BLOCK DIAGRAM
11.1. IC801
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KX-TS2368RUW
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