Panasonic KX-TC1045RUB Service Manual ▷ View online
22.6. Initializing Circuit
Function:
This circuit is used for to initialize the microcomputer when it
incorporates an AC adaptor.
Circuit Operation:
When the AC Adaptor is inserted into the unit, then the voltage
is shifted by D303 and power is supplied to the CPU.
The set can operate beyond point A in the circuit voltage
diagram.
This circuit is used for to initialize the microcomputer when it
incorporates an AC adaptor.
Circuit Operation:
When the AC Adaptor is inserted into the unit, then the voltage
is shifted by D303 and power is supplied to the CPU.
The set can operate beyond point A in the circuit voltage
diagram.
22.7. CHARGE DETECT CIRCUIT
22.7.1. Circuit Operation:
•
•
CHARGE MODE
When charging the handset on the base unit, CH. ID CODES
are sent from the CTL terminal to the handset, and charging
current is supplied to the handset from the battery charge
contacts via R314, R315, on base unit:When - contact on base
unit is input to Pin 60 of IC701 (DSP) through Q313. When the
A point on the handset is High level, Q502 on handset goes on
and Pin 24 of IC901 becomes Low, In this way the CPU on
handset detects the fact that the
battery is charged.
are sent from the CTL terminal to the handset, and charging
current is supplied to the handset from the battery charge
contacts via R314, R315, on base unit:When - contact on base
unit is input to Pin 60 of IC701 (DSP) through Q313. When the
A point on the handset is High level, Q502 on handset goes on
and Pin 24 of IC901 becomes Low, In this way the CPU on
handset detects the fact that the
battery is charged.
•
•
Set up of the handset
When charging the handset on the base unit, the data signal is
sent from CTL terminal to handset. The Q312 switching is
affected by Pin 97 of IC701 on base unit, the sending data are
sent from CTL terminal to handset. The Q312 switching is
affected by Pin 97 of IC701 on base unit, the sending data are
CH data, ID code, tone or pulse mode data etc. The data signal
is sent to Pin 23 of IC901 (CPU) via Q501 on handset.While
charging these data continue to be sent to the CPU of handset.
is sent to Pin 23 of IC901 (CPU) via Q501 on handset.While
charging these data continue to be sent to the CPU of handset.
When charging the handset on the base unit, the data signal is
sent from CTL terminal to handset. The Q312 switching is
affected by Pin 97 of IC701 on base unit, the sending data are
CH data, ID code, tone or pulse mode data etc. The data signal
is sent to Pin 23 of IC901 (CPU) via Q501 on handset. When
the handset is placed on the base unit, these data is sent to
handset CPU repeatedly (8 times).
sent from CTL terminal to handset. The Q312 switching is
affected by Pin 97 of IC701 on base unit, the sending data are
CH data, ID code, tone or pulse mode data etc. The data signal
is sent to Pin 23 of IC901 (CPU) via Q501 on handset. When
the handset is placed on the base unit, these data is sent to
handset CPU repeatedly (8 times).
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KX-TC1045RUB
22.8. Power Supply Circuit
Function:
Power from the AC adaptor passes through a regulating block
consisting of IC301.
Circuit Operation:
IC301 is a regulated power supply. The voltage at point A is
regulated to 8 V by IC301.
The voltage at point B is dropped by Q302 to 4.9 V.
The voltage at point C is dropped by D710, D303~305, D701 to
4.2 V.
Power from the AC adaptor passes through a regulating block
consisting of IC301.
Circuit Operation:
IC301 is a regulated power supply. The voltage at point A is
regulated to 8 V by IC301.
The voltage at point B is dropped by Q302 to 4.9 V.
The voltage at point C is dropped by D710, D303~305, D701 to
4.2 V.
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KX-TC1045RUB
22.9. CPU OPERATION
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KX-TC1045RUB
In area where the transmission power from the handset is extremely weak, noise is superimposed on the data and the chance of
an error can become extremely great upon reception of the data. To help prevent this, the above circuit is used.
an error can become extremely great upon reception of the data. To help prevent this, the above circuit is used.
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KX-TC1045RUB
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