DOWNLOAD Panasonic KX-PRW110RUW / KX-PRW120RUW / KX-PRWA10RUW Service Manual ↓ Size: 6.94 MB | Pages: 87 in PDF or view online for FREE

13

QSPI

FLASH MEMORY

IC2

Reset

Reset

Pin B8

ADPCM

Codec

Filter

DSP

Speech

Decoding

Speech

Encoding

BMC

Burst

Decoding

ANT1

Burst

Encoding

RF

PLL

MOD/DEMOD

C1

D1

A4

A5

RXn

ANT1

RXp

TXp

TXn

G1

F1

XTAL

X1

20.7

3

6

MHz

BATTERY

T4

ON SWITCH

KEYPAD

Charge

Pump

ROWS

COLUMNS

U5, T6, V5, T7, 

N1

F

3

, G2, G

3

, H2, 

T11

V12, U1

3

, V14, T12

BBIC

QSPI

Control

U12

U14

KX-PR

W

A10 BLOCK DIA

GRAM (Handset)

SPI

Control

SPI

FLASH MEMOR

Y

IC4

C9 SPI_EN

+2.8V

C11 SPI_DI

B1

3

 SPI_DO

A14 SPI_CLK

+

3

.0V

DC/DC

Control

CONVER

TER

CPU

LDO_OI_CTRL

CIRCUIT

CONVER

TER

DC/DC

Q8, L

3

3

.0V

Q7

+

3

.0V

+2.8V

SPEAKER

RECEIVER

MIC

CHARGE

CIRCUIT

CHARGE

CONTACTS

CHARGE(+)

CHARGE_CTRL

CHARGE

EEPROM

SCL

SDA

BATTERY

TERMINAL

R1

VBAT

BATT-

1.8 V

Q6

1.8 V

LCD

RS

RDn

D

AB[0-7]

 LCD_RESET

CPU

Analog

Front

End

D/A

A/D

U8, V8

U9, V9

K

3

K2

H1

J

3

R2

R1

B12

A1

3

 

M5

M

3

J14

J18, J17, J16, L18, M18, 

N18, P18,P17

E1

3

P

3

K16

 C16

LCD-BACK  LIGHT

KEY   LED

A9

LDO_CTRL

CP3V

+2.8V

 DC/DC CONVER

TER CIRCUIT Q9, L4

WRn

LCD_CS

 B15

+

3

.0V

+1.8V

+

3

.4V

+

3

.4V

Q2, Q

3

, Q4

R4, R7, R8

14

Handset consists of the following ICs as shown in Block Diagram (Handset) (P.13).

• DECT BBIC (Base Band IC): IC1

- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, DC/DC Converter, EEPROM, LCD, RF Power Amp.)
- PLL Oscillator
- Detector
- Compress/Expander
- Reception
- Integrated 1.9 GHz PA for DECT

• QSPI FLASH MEMORY: IC2

- Main Program D/L Area

• EEPROM: IC3

- Temporary operating parameters (for RF, etc.)

• SPI FLASH MEMORY: IC4

- Wall paper, Ringer Tone D/L Area.

When power on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: BATT+) 

→ P1 → L3 → Q8 → Q6 (1.8 V), Q7 (3.0V)

The Reset signal generates IC1 (B8 pin) and 1.8 V.

When charging the handset on the Base Unit, the charge current is as follows;

DC+(5.5 V) 

→ R371 → R372 → D362 → CHARGE+(Base) → CHARGE+(Handset) → 

 

→ Q2 → P1 → BATTERY+...

Battery... 
BATTERY- 

→ R1→ 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 Q4 of Handset.
Refer to Fig.101 in Power Supply Circuit (P.11).

“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)   2.25 V ± 50 mV

The BBIC detects this level and "

" starts flashing.

• Power Down

Battery voltage: V(Batt)   2.0 V ± 50 mV
The BBIC detects this level and power down.

1.8 V

Reset
(IC1_B8pin)

Battery +

Q3
R4

15

The hands-free loudspeaker at SP+ and SP- is used to generate the ring alarm.

16

SIGNAL ROUTE

ROUTE

IN

OUT

SIGNAL

DTMF TONE
TEL OUT
(to Tel Line)

CDL TX
(to Tel Line)

CDL RX
(from Tel Line)

DTMF TONE
TEL IN
(from Tel Line)

SP-PHONE TX
(to Tel Line)

 SP-PHONE RX
(from Tel Line)

Caller ID
(from Tel Line)

(BASE UNIT)
B - P101 - C106 - R106 - R107 - IC501 (CIDINp)        IC501 (TXp)        C819 

   

A - C105 - R105 - R108 - IC501 (CIDINn)                    IC501 (TXn)

(BASE UNIT)
IC501 (LSRp) - C184 - Q161 - Q141 - D101         A

(BASE UNIT)
A                    D101 - Q141 - Q161 - R164 - C173 - R178 - IC501 (MICn)

 P101- B

(BASE UNIT)
from HANDSET   ANT1 - C894         DA802        IC501 (RXn) 

 

ANT2 - C893

IC501 (RXp)

IC501 (LSRp) - C184 - Q161 - Q141 - D101        A

 P101- B

B - P101

- C819 -  DA802       C894 - ANT1  to HANDSET

(HANDSET)
from BASE UNIT   ANT - C50 

(BASE UNIT)
A                 D101 - Q141 - Q161 - R164 - C173 - R178 - IC501 (MICn)         IC501 (TXp)         
B - P101                                                                                                        IC501 (TXn)

C893 - ANT2

IC1 (D1)
IC1 (C1)

IC1 (K3) - RECEIVER (+)

IC1 (K2) - RECEIVER (–)

DA802 –– C894 - ANT1
              – C893 - ANT2                

 to HANDSET

 to HANDSET

(HANDSET)
from BASE UNIT   ANT - C50 –– IC1 (D1) ––– IC1 (U8, V8) - SP (–)

                                                                                         – IC1 (C1) –  – IC1 (U9, V9) - SP (+)

(BASE UNIT)
A                  D101 - Q141 - Q161 - R164 - C173 - R178 - IC501 (MICn) 
B - P101
–– IC501 (TXp) - C819 - DA802 –– C894 - ANT1
  – IC501 (TXn)                                C893 - ANT2

(HANDSET)
MIC (+) - C10 - R17 - IC1 (J3)        IC1(A4)
MIC (–) - C9  - R16 - IC1 (H1)           IC1(A5)         C51  - C50 - ANT to BASE

(BASE UNIT)
from HANDSET   ANT1 - C894         DA802        IC501 (RXn) 

ANT2 - C893

IC501 (RXp)

IC501 (LSRp) - C184 - Q161 - Q141 - D101        A

 P101- B

(HANDSET)
MIC (+) - C10 - R17 - IC1 (J3)        IC1(A4)
MIC (–) - C9  - R16  - IC1 (H1)          IC1(A5)         C51  - C50 - ANT to BASE