DOWNLOAD Panasonic KX-TG8521UAB / KX-TGA850RUB (serv.man2) Service Manual ↓ Size: 3.68 MB | Pages: 90 in PDF or view online for FREE

5

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.

When discarding P. C. Board, delete all personal information such as telephone directory and caller list or scrap P. C. Board.

0.3 mm X 100 g

0.6 mm X 100 g

1.0 mm X 100 g

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• Design and specifications are subject to change without notice.

• Operation range: Up to 300 m outdoors, Up to 50 m indoors, depending on the condition.
• Analog telephone connection: Telephone Line
• Optional headset: RP-TCA400, RP-TCA430

DECT (Digital Enhanced Cordless 
Telecommunications),
GAP (Generic Access Profile)

120 Duplex Channels

1.88 GHz to 1.90 GHz

TDMA (Time Division Multiple Access)

1,728 kHz

1,152 kbit/s

GFSK (Gaussian Frequency Shift Keying)

Approx. 10 m W (average power per channel) 

220–240 V AC, 50/60 Hz

Base unit: PQLV219CEW

Charger: PQLV219CEW

Standby: Approx. 0.5 W
Maximum: Approx. 3.8 W
Charger:
Standby: Approx. 0.2 W
Maximum: Approx. 3.0 W

0

°C–40 °C, 20 %–80 % relative air humidity (dry) 

Base unit: Approx. 146 mm  x 89 mm x 83 mm
Handset: Approx. 48 mm  x 32 mm x 154 mm
Charger: Approx. 72 mm x 85 mm x 52 mm

Base unit: Approx. 190 

g

Handset: Approx. 130 

g

Charger: Approx. 60 

g

ADPCM 32 kbit/s

7

Analog

Front

End

To TEL_LINE

Bridge

Rect

 D

3
 D

3

Hook Switch

Q4,Q5Q

4

,Q

5

A

u

dio

Bell/Caller ID

Interface

CPU

18

16

2

3

20

21

19

24

BELL

HOOK

Off-Hook Line Voltage

25

A/D

D/A

ADPCM

Codec Filter

DSP

Speech Encoding

Speech Decoding

BMC

B

u

rst Encoding

B

u

rst Decoding

RF

PLL 

5

3

77

75

9

10

EEPROM

SCL

SDA

57

58

44

To AC Adaptor

Limit

Resistor

Charge

Detector

CHARGE

CONTACT

IC2IC

2

Q9Q

9

Q8Q

8

2.4V

Reg.

1.8V

Reg.

3

.0 V

2.4 V

1.8 V

BBIC

KX-TG8521 BLOCK DIA

GRAM 

(BASE UNIT)

MOD/DEMOD

Charge

P

u

mp

4

3

2.5V

XTAL

X1X

1

10.

3

68

MHz

RX

n

RX

p

TX

p

TX

n

P

on

PSEL

V

DD

-PADRV

4

3

6

7

TX

on

RX

on

D801

6

72

ANT1

ANT2

9

8

ANT1

ANT2

RF PA

ANT1

ANT2

78

7

3

74

80

L1

L2

DCP

DCM

2

FLASH MEMORY

IC421

42

3

.0V

54 
55

56 
53

TAM-CSn

SPI-DI 
SPI-DO

SPICLK

IC

3
IC

3

8

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