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Model
KX-TG7207UAJ KX-TG7207UAM KX-TG7207UAS KX-TG7207UAT KX-TG7208UAM KX-TG7208UAS KX-TG7208UAT KX-TGA720UAJ KX-TGA720UAM KX-TGA720UAS KX-TGA720UAT
Pages
88
Size
2.32 MB
Type
PDF
Document
Service Manual
Brand
Device
Telephone / DIGITAL CORDLESS PHONE
File
kx-tg7207uaj-kx-tg7207uam-kx-tg7207uas-kx-tg7207ua.pdf
Date

Panasonic KX-TG7207UAJ / KX-TG7207UAM / KX-TG7207UAS / KX-TG7207UAT / KX-TG7208UAM / KX-TG7208UAS / KX-TG7208UAT / KX-TGA720UAJ / KX-TGA720UAM / KX-TGA720UAS / KX-TGA720UAT Service Manual ▷ View online

5
KX-TG7207UA/KX-TG7208UA/KX-TGA720UA
2.2.1.
Suggested PbF Solder
There are several types of PbF solder available commercially. While this product is manufactured using Tin, Silver, and Copper
(Sn+Ag+Cu), you can also use Tin and Copper (Sn+Cu) or Tin, Zinc, and Bismuth (Sn+Zn+Bi). Please check the manufacturer’s
specific instructions for the melting points of their products and any precautions for using their product with other materials. 
The following lead free (PbF) solder wire sizes are recommended for service of this product: 0.3 mm, 0.6 mm and 1.0 mm.
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 condition
• Analog telephone connection: Telephone Line
6
KX-TG7207UA/KX-TG7208UA/KX-TGA720UA
4 Technical Descriptions
4.1.
Block Diagram (Base Unit)
KX-TG7207/7208 BLOCK DIA
G
RAM 
(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
7
KX-TG7207UA/KX-TG7208UA/KX-TGA720UA
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.6).
• 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
8
KX-TG7207UA/KX-TG7208UA/KX-TGA720UA
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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