DOWNLOAD Panasonic KX-TG6481UAT / KX-TGA648RUT Service Manual ↓ Size: 2.43 MB | Pages: 87 in PDF or view online for FREE

Model
KX-TG6481UAT KX-TGA648RUT
Pages
87
Size
2.43 MB
Type
PDF
Document
Service Manual
Brand
Device
Telephone / DIGITAL CORDLESS ANSWERING SYSTEM
File
kx-tg6481uat-kx-tga648rut.pdf
Date

Panasonic KX-TG6481UAT / KX-TGA648RUT Service Manual ▷ View online

6
KX-TG6481UAT/KX-TGA648RUT
3 Specifications
Note:
• Design and specifications are subject to change without notice.
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-TG6481UAT/KX-TGA648RUT
4 Technical Descriptions
4.1.
Block Diagram (Base Unit)
Analog
Front
End
T
o TEL_LINE
Bridge
Rect
 D3D3
Hook Switch
Q4,Q5
Audio
Bell/Caller ID
Interface
CPU
18
16
23
20
21
19
24
BELL
HOOK
Off-Hook Line Voltage
25
A/D
D/A
ADPCM
Codec Filter
DSP
Speech Encoding
Speech Decoding
BMC
Burst Encoding
Burst Decoding
RF
PLL
5
3
77
75
9
10
EEPROM
SCL
SDA
57
58
44
To AC Adaptor
Limit
Resistor
Charge
Detector
CHARGE
CONTACT
(Optional)
VUNREG
3.0V
Reg.
IC1
2.4V
Reg.
Q9
1.8V
Reg.
Q8
3.0 V
2.4 V
1.8 V
BBIC
IC401
IC7
KX-TG6481 BLOCK DIAGRAM 
(BASE UNIT)
MOD/DEMOD
Charge
Pump
43
2.5V
X
T
A
L
X
1
X1
10.3
6
8
M
H
z
IC
801
R
X
n
R
X
p
T
X
p
T
X
n
P
on
P
S
E
L
V
DD
-P
A
D
R
V
4
3
6
7
T
X
on
R
X
on
D801
6
72
AN
T1
AN
T2
9
8
AN
T1
ANT2
R
F
 P
A
ANT1
AN
T2
78
73
74
80
L
1
L2
L1
L2
2
FLASH MEMORY
IC421
42
3.0V
54 
55
56 
53
TA
M-C
SN
SP
I-DI
SP
I-DO
SP
ICL
K
8
KX-TG6481UAT/KX-TGA648RUT
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
- PLL Oscillator
- Detector 
- Compress/Expander
- First Mixer
- All interfaces (ex: RF Power Amp, EEPROM, LED, Analog Front End, etc.)
• RF Power Amp.: IC801
- Amplifier for transmission and reception
• EEPROM: IC401
- Temporary operating parameters (for RF, etc.)
• FLASH MEMORY: IC421
- Voice Prompt (TAM) D/L Area
- ICM/OGM Recording Area
• Additionally,
- Power Supply Circuit (+3.0 V, +2.4 V, +1.8 V output)
- Crystal Circuit (10.368 MHz)
- Charge Circuit
- Telephone Line Interface Circuit
9
KX-TG6481UAT/KX-TGA648RUT
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): 
DC Jack (+6.5 V) 
→D1→ IC1 → IC7
DC Jack (+6.5 V) 
→D1→ IC1 → Q9 → IC7
DC Jack (+6.5 V) 
→D1→ IC1 → Q8 → IC7
• RF Power Amp. (IC801): 
DC Jack (+6.5 V) 
→D1→ IC1 → IC801 (Power AMP)
• EEPROM (IC401): 
DC Jack (+6.5 V) 
→D1→ IC1 → IC7→ IC401
• FLASH MEMORY (IC421): 
DC Jack (+6.5 V) 
→D1→ IC1→ IC7→ IC421
• Charge Contact (TP16): 
DC Jack (+6.5 V) 
→D1→ R56 →  R55 → D22→ TP16
<Fig.101>
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