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Model
KX-TG8207UAB KX-TG8207UAJ KX-TG8207UAM KX-TG8207UAW KX-TG8208UAB KX-TG8208UAW KX-TGA820RUB KX-TGA820RUJ KX-TGA820RUM KX-TGA820RUW KX-TGA820UAB KX-TGA820UAJ KX-TGA820UAM KX-TGA820UAW
Pages
96
Size
2.7 MB
Type
PDF
Document
Service Manual
Brand
Device
Telephone / DIGITAL CORDLESS PHONE
File
kx-tg8207uab-kx-tg8207uaj-kx-tg8207uam-kx-tg8207ua.pdf
Date

Panasonic KX-TG8207UAB / KX-TG8207UAJ / KX-TG8207UAM / KX-TG8207UAW / KX-TG8208UAB / KX-TG8208UAW / KX-TGA820RUB / KX-TGA820RUJ / KX-TGA820RUM / KX-TGA820RUW / KX-TGA820UAB / KX-TGA820UAJ / KX-TGA820UAM / KX-TGA820UAW Service Manual ▷ View online

6
KX-TG8207UA/KX-TG8208UA/KX-TGA820RU/KX-TGA820UA
3 Specifications
Note:
• Specifications are subject to change.
Note for Service:
• Operation range: Up to 300 m outdoors, Up to 50 m indoors, depending on the condition.
• Analog telephone connection: Telephone Line
7
KX-TG8207UA/KX-TG8208UA/KX-TGA820RU/KX-TGA820UA
4 Technical Descriptions
4.1.
Block Diagram (Base Unit)
KX-TG8207/8208  BLOCK DIA
GRAM 
(BASE UNIT)
Analog
Front
End
To TEL_LINE
A
B
CN1
Bridge
Rect
 D3 D3
Hook Switch
Q
4
,Q
5
Audio
Bell/Caller ID
Interface
Charge
Detector
CPU
59
54
61
52
60
56
55
BELL
HOOK
(Optional)
Off-Hook Line Voltage
64 ADCO
A/D
D/A
ADPCM
Codec Filter
DSP
Speech Encoding
BMC
Burst Encoding
RF
Interface
18
19
TXDA
RXDA
21
20
22
SYCL
SYDA
SYEN
ANT1
ANT2
RF Module
18
16
2
31
21
14
13
12
12
13
XTAL
X
1
10.368
MHz
EEPROM
SCL
SDA
6
5
7
To AC Adaptor
CN2
Limit
Resistor
CHARGE
CONTACT
VUNREG
3.3V
Reg.
IC
1
2.5V
Reg.
Q
9
1.8V
Reg.
Q
8
3.3 V
2.5 V
1.8 V
BBIC
IC5
IC7
IC10
Speech Decoding
Burst Decoding
8
KX-TG8207UA/KX-TG8208UA/KX-TGA820RU/KX-TGA820UA
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): IC7
- 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 code 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.)
• RF Module: IC10
- PLL Oscillator
- Detector
- Compress/Expander
- First Mixer
- Amplifier for transmission and reception
• EEPROM: IC5
- Temporary operating parameters (for RF, etc.)
• Additionally,
- Power Supply Circuit (+3.3 V, +2.5 V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Charge Circuit
- Telephone Line Interface Circuit
9
KX-TG8207UA/KX-TG8208UA/KX-TGA820RU/KX-TGA820UA
4.2.2.
Power Supply Circuit
The power is supplied to the DECT BBIC, RF Module, EEPROM and Charge Contact from AC Adaptor (+6.5 V) as shown in
Fig.101. The power supply is as follows;
• DECT BBIC (IC7): 
CN2 (+6.5 V) 
→ IC1 → Q9 → IC7
CN2 (+6.5 V) 
→ IC1 → Q8 → IC7
• RF Module (IC10): 
CN2 (+6.5 V) 
→ IC1 → Q8 → IC10 (Radio Transceiver) (Digital)
CN2 (+6.5 V) 
→ IC1 → Q9 → IC10 (Radio Transceiver) (Analog)
CN2 (+6.5 V) 
→ IC1 → R125 → IC10 (Power AMP)
• EEPROM (IC5): 
CN2 (+6.5 V) 
→ IC1 → Q9 → IC5
• Charge Contact (TP16): 
CN2 (+6.5 V) 
→ R57 → R56 → R55 → D22 → TP16
<Fig.101>
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