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Model
KX-TG1611CAH KX-TG1611CAR KX-TG1611CAW KX-TG1612CA3 KX-TG1612CAH KX-TGA161RUH KX-TGA161RUR KX-TGA161RUW
Pages
64
Size
2.11 MB
Type
PDF
Document
Service Manual
Brand
Device
Telephone / DIGITAL CORDLESS PHONE
File
kx-tg1611cah-kx-tg1611car-kx-tg1611caw-kx-tg1612ca.pdf
Date

Panasonic KX-TG1611CAH / KX-TG1611CAR / KX-TG1611CAW / KX-TG1612CA3 / KX-TG1612CAH / KX-TGA161RUH / KX-TGA161RUR / KX-TGA161RUW Service Manual ▷ View online

8
KX-TG1611CA/KX-TG1612CA/KX-TGA161RU
4.2.
Circuit Operation (Base Unit)
4.2.1.
Outline
Base Unit consists of the following ICs as shown in Block Diagram (Base Unit) (P.7).
• DECT BBIC (Base Band IC): IC3 (career module)
- Handling all the audio, signal and data processing needed in a DECT base unit
- Controlling the DECT specific physical layer and radio section (Burst Module Controller section)
- ADPCM codec filter for speech encoding and speech decoding (DSP section)
- Echo-cancellation and Echo-suppression (DSP section)
- Any tones (tone, sidetone, ringing tone, etc.) generation (DSP section)
- DTMF receiver (DSP section)
- Clock Generation for RF Module
- ADC, DAC, timer, and power control circuitry
- All interfaces (ex: RF module, EEPROM, LED, Analog Front End, etc.)
- PLL Oscillator
- Detector
- Compress/Expander
- First/Second Mixer
- Amplifier for transmission and reception
• EEPROM: IC1
- Temporary operating parameters (for RF, etc.)
• Additionally,
- Power Supply Circuit (+2.65V output)
- Crystal Circuit (20.736MHz)
- Charge Circuit
- Telephone Line Interface Circuit
4.2.2.
Power Supply Circuit
The power is supplied to the DECT BBIC, RF Module, EEPROM, Relay Coil, LED and Charge Contact from AC Adaptor as
shown in Fig.101. The power supply is as follows:
<Fig.101>
IC2
BBIC 
IC3-VDDBAT
Q101
L104
R102
H/S 
BBIC (IC301 Charge_start)
BATTERY
R39
CHARGE+
CHARGE-
TP5
TP6
<Base  Unit>
<Handset>
+
F1
2.65V
J2
AC Adaptor
+
EEP ROM
IC1
IC2
9
KX-TG1611CA/KX-TG1612CA/KX-TGA161RU
4.2.3.
Telephone Line Interface
<Function>
• Bell signal detection
• Clip signal detection
• ON/OFF hook circuit
• Audio circuits
Bell & Clip (: Calling Line Identification Presentation: Caller ID) signal detection:
In the standby mode, Q3 is open to cut the DC loop current and decrease the ring load.
When ring voltage appears at the L1T and L1R leads (when the telephone rings), the signal is transferred as follows; 
• A 
→ C26 → R33 → R50, C70 → R16, R30 → R200 → LINEN [BELL & CLIP]
• B 
→ C27 → R34 → R51, C71 → R19, R31 → R201 → LINEP [BELL & CLIP]
ON/OFF hook circuit:
In the standby mode, Q3 is open, and connected as to cut the DC loop current and to cut the voice signal. The unit is consequently
in an off-hook condition
When IC3 detects a ring signal or press the TALK Key onto the handset, Q2 turns on and then Q3 turns on, thus providing an off-
hook condition
 (active DC current flow through the circuit) and the following signal flow is for the loop current.
• A 
→ D2 → Q3 → Q1 → R9 → R10 → D2→ B [OFF HOOK]
Audio circuits:
Refer to Signal Route (P.12). 
4.2.4.
Transmitter/Receiver
Base Unit and Handset mainly consist of RF Module and DECT BBIC. 
Base Unit and Handset transmit/receive voice signal and data signal through the antenna on carrier frequency.
Signal Path:
*Refer to Signal Route (P.12).
4.2.4.1.
Transmitter Block
The voice signal input from the TEL LINE interface goes to DECT BBIC (IC3) as shown in Block Diagram (Base Unit) (P.7)
The voice signal passes through the analog part of IC3 where it is amplified and converted to a digital audio stream signal. The
burst switch controller processes this stream performing encryption and scrambling, adding the various other fields to produce
the GAP (Generic Access Profile) standard DECT frame, assigning to a time slot and channel etc.
In IC3, the carrier frequency is changing, and frequency modulated RF signal is generated and amplified, and radiated from
antenna. Handset detects the voice signal or data signal in the circuit same as the following explanation of Receiver Block.
4.2.4.2.
Receiver Block
The signal of 1.9 GHz band (1.881792 GHz ~ 1.897344 GHz) which is input from antenna is input to IC3 as shown in Block
Diagram (Base Unit)
 (P.7).
In IC3, the signal of 1.9 GHz band is demodulated, and goes to IC2 as GAP (Generic Access Profile) standard DECT frames. It
passes through the decoding section burst switch controller where it separates out the frame information and performs de-
encryption and de-scrambling as required. It then goes to the DSP section where it is turned back into analog audio. This is
amplified by the analog front end, and goes to the TEL LINE Interface.
4.2.5.
Pulse Dialling
During pulse dialing the hookswitch (Q3, Q4) is used to generate the pulses using the HOOK control signal, which is set high
during pulses. To force the line impedance low during the “pause” intervals between dial pulses, the PULSE_DIAL signal turns
on Q2.
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KX-TG1611CA/KX-TG1612CA/KX-TGA161RU
4.3.
Block Diagram (Handset)
E a r p i e s e 
( S p e a k e r ) 
A n a l o g 
F r o n t 
E n d 
D S P 
R F 
C P U 
X T A L 
2 0 . 7 3 6 M H z 
X101
E E P R O M 
( I C 1 0 2 ) 
B A T T E R Y 
C O S I C 
C h a r g e + 
C h a r g e - 
R e g u l a t o r 
3 . 3 V 
5
4
45
44
35
36
C h a r g e 
c i r c u i t 
S C L K 
D A T A 
48
47
M I C 
K E Y P A D 
O N  S W I T C H 
R I N G E R 
3 . 3 V 
37
R102
C H A R G E 
C H A R G E 
L C D 
3 . 3 V 
V D D B A T 
V D D D C D C 
Q 1 0 3
38
1
2 . 4 V 
2 . 4 V 
Q101/102
2 . 4 V 
SDRV
M A D 4 P 
32
IC103
IC101
KX-TGA161 BLOCK DIAGRAM (HANDSET)
BZ2
R102
Q105
53
54
Q104
11
KX-TG1611CA/KX-TG1612CA/KX-TGA161RU
4.4.
Circuit Operation (Handset)
4.4.1.
Outline
Handset consists of the following ICs as shown in Block Diagram (Handset) (P.10).
• DECT BBIC (Base Band IC): IC103
- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, EEPROM, LCD)
- PLL Oscillator
- Detector
- Compress/Expander
- Amplifier for transmission and reception
• EEPROM: IC102
- Temporary operating parameters
4.4.2.
Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Handset, the voltage is as follows;
The Reset signal generates R121, C186 and  2.6V.
4.4.3.
Charge Circuit
Circuit Operation:
When charging the handset on the Base Unit, the charge current is as follows;
DC+ 
→ F1 → R39 → CHARGE+ (Base) → CHARGE+ (Handset) → Q101 → L104 → BATTERY+... Battery... 
BATTERY- 
→ R102 → GND → CHARGE- (Handset)→ CHARGE- (Base) → GND → DC- (GND)
In this way, the BBIC on Handset detects the fact that the battery is charged.
The charge current is controlled by switching Q101 of Handset.
Refer to Fig.101 in Power Supply Circuit (P.8).
4.4.4.
Battery Low/Power Down Detector
Circuit Operation:
“Battery Low” and “Power Down” are detected by BBIC which check the voltage from battery.
The detected voltage is as follows;
• Battery Low
Battery voltage: V (Batt) < 2.20V
The BBIC detects this level and “
” is displayed on LCD and “battery alarm” starts ringing.
• Power Down
Battery voltage: V (Batt) < 2.05V
The BBIC detects this level and power down.
4.5.
Circuit Operation (Charger Unit)
4.5.1.
 Power Supply Circuit
The power supply is as shown.
B A T T E R Y   ( 2 . 2   V      2 . 6 V )           D 1 0 7          IC103 - V D D B A T           I C 1 0 3 - S D R V           R 1 0 7  
L 1 0 3          I C 1 0 1          3 . 3 V 
~
R1
5.5 V DC
TP1
TP2
J1
AC Adaptor
F1
AC
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