Panasonic KX-TCD965GC Service Manual ▷ View online
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KX-TCD965GC
3.10 POWER SUPPLIES (SEE Fig. 22)
The AC Adaptor for the KX-TCD961GB/KX-TCD965GC consists of two separate isolated DC supplies providing a
+8 V supply for the base circuitry, and a 9 V supply only for the charger circuit. The isolation is because the main base
circuitry is connected to the telephone line, so potentially hazardous voltages may be present, while the charger
circuitry has charge contacts that could be touched by the operator, so the two supplies must be kept separate.
The 8 V supply from the AC Adaptor is connected via J2 pin 1 (TP90) +8 V, and J2 pin 2 (TP89) ground.
The unregulated +8 V supply is fed to the first regulator.
This regulator IC5 provides a regulated output pin 2 (TP91) of +4.0 V (called +4V).
The second regulator IC6 is fed with +4V and provides the stable +3.0V supply (TP95). During power-up this
regulator generates a RESET signal (TP94) which is used to reset the microcontroller and BBIC.
3.11 BATTERY CHARGER (SEE Fig. 22)
The 9 V supply from the AC Adaptor is connected via J2 pin 6 (TP82) positive, and J2 pin 5 (TP78) negative. The
constant current battery charger circuit is made up of T14 and T15 (series pass transistor) and associated
components. Charging detector circuit T16 switches on when a charging current flows through R64 and D11, and
turns on the IC7 and “Charging” LED D501. The charge contacts are J3 (TP89) positive and J4 (TP88) negative.
Charge current flows in via J4, through T15, R63, AC Adaptor 9 V supply, R64, D11, and out via J3.
Circuit Diagram
VUNREG
RESET
Fig. 22
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KX-TCD965GC
4. TAM SECTLON
4.1 GREETING RECORDING CIRCUIT (SEE Fig. 23)
Circuit Operation:
MIC
MIC
→
R318
→
Pin(2)
→
IC302
Pin(1) IC302
→
Emitter of T302
→
Collector of T302
→
R323
→
C111
→
R110 Pin(58) IC101
Circuit Diagram
Circuit Diagram
Fig. 23
4.2 ICM PLAY CIRCUIT (SEE Fig. 24)
Circuit Operation:
Pin(63) IC101
Pin(63) IC101
→
C101
→
R100
→
C313
→
Emitter of T303
→
Collector of T303
→
Base of T304
→
Emitter of T304
→
Pin(5)
IC302
→
Pin(7) IC302
→
Pin(4) IC301
→
Pin(8) IC301
→
C343
→
Spealcer
4.3 ICM RECORDING CIRCUIT (SEE Fig. 25)
Circuit Operation:
TEL LINE
TEL LINE
→
Collector of T8
→
C337
→
R338
→
R339
→
C111
→
R110
→
Pin(58) IC101
Fig. 24
Circuit Diagram
Fig. 25
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KX-TCD965GC
4.4GREETING PLAYBACK CIRCUIT (SEE Fig. 26)
Circuit Operation:
Pin(63) IC101
Pin(63) IC101
→
C101
→
R100
→
R43
→
Speaker
Circuit Diagram
4.5 INTERCOM MODE
1) When the base unit LOCATOR/INT button is pressed, a call monitor signalisoutput from Pin(63 )IC101.
2) The receiving signal flows:
from portable unit
→
Pin(63) IC101
→
C101
→
R100
→
C313
→
Emitter of T303
→
Collector of T303
→
Base of
T304
→
Emitter of T304
→
Pin(5) IC302
→
Pin(7) IC302
→
Pin(4) IC301
→
Pin(8) IC301
→
C343
→
Spealcer
4.6 INITIALIZING CIRCUIT for SUB CPU (SEE Fig. 27)
Function:
This circuit is used for to initialize the SUB microcomputer (IC501) when it incorporates an AC adaptor.
This circuit is used for to initialize the SUB microcomputer (IC501) when it incorporates an AC adaptor.
Circuit Operation:
When the AC Adaptor is insered into the unit, then the voltage is shifted by D201 and power is supplied to the CPU.
The set can operate beyond point (A) in the circuit voltage diagram.
When the AC Adaptor is insered into the unit, then the voltage is shifted by D201 and power is supplied to the CPU.
The set can operate beyond point (A) in the circuit voltage diagram.
Circuit Diagram
Pin 20 IC501 (RESET)
Pin 17 IC501 (VDD)
Fig. 26
Fig. 27
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KX-TCD965GC
4.7 POWER SUPPLY CIRCUIT (for TAM) (SEE Fig. 28)
Circuit Operation:
Power from the AC adaptor is supplied directly to the plunger. The voltage at point (A) is regulated to 5.7V by IC8 .The
5.7V voltage is dropped by D204, to 5V.
Power from the AC adaptor is supplied directly to the plunger. The voltage at point (A) is regulated to 5.7V by IC8 .The
5.7V voltage is dropped by D204, to 5V.
Circuit Diagram
+
-
+
-
D201
D204
C60
R75
C61
C56
D205
C49
3V
A
5V
IC201
IC8
DC
JACK
JACK
1
2
3
4
5
6
2
3
4
5
6
5.7V
IC302
IC301
IC501
RESET
CIRCUIT
CIRCUIT
OP AMP
OP AMP
TAM CPU
IN OUT
GND
4V
3V
IC6
IC5
Fig. 28
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