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Model
KX-TG5511CAB KX-TG5511CAJ KX-TGA550RUB KX-TGA550RUJ KX-TGA551RUB KX-TGA551RUJ (serv.man2)
Pages
88
Size
2.7 MB
Type
PDF
Document
Service Manual
Brand
Device
Telephone / DIGITAL CORDLESS PHONE
File
kx-tg5511cab-kx-tg5511caj-kx-tga550rub-kx-tga550ru.pdf
Date
PREV: Panasonic KX-TG5511CAB / KX-TG5511CAJ / KX-TGA550RUB / KX-TGA550RUJ / KX-TGA551RUB / KX-TGA551RUJ Service Manual / Supplement

Panasonic KX-TG5511CAB / KX-TG5511CAJ / KX-TGA550RUB / KX-TGA550RUJ / KX-TGA551RUB / KX-TGA551RUJ (serv.man2) Service Manual ▷ View online

13
KX-TG5511CA/KX-TGA550RU/KX-TGA551RU
4.4.
Circuit Operation (Handset)
4.4.1.
Outline
Handset consists of the following ICs as shown in Block Diagram (Handset) (P.12).
• 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
• RF Power Amp: IC801
- Amplifier for transmission
• EEPROM: IC3
- Temporary operating parameters (for RF, etc.)
4.4.2.
Power Supply Circuit/Reset Circuit
Circuit Operation:
When power on the Handset, the voltage is as follows;
BATTERY(2.2 V ~ 2.6 V: BATT+) 
→ F1 → Q2 (1.8 V), IC1-43pin (2.5V)
The Reset signal generates IC1 (61 pin) and 1.8 V.
4.4.3.
Charge Circuit
Circuit Operation:
When charging the handset on the Base Unit, the charge current is as follows;
DC+(6.5 V) 
→ R56 → R55 → D22 → CHARGE+(Base) → CHARGE+(Handset) → Q4 → D7→ F1 → BATTERY+... Battery... 
BATTERY- 
→ R45 → 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 Q9 of Handset.
Refer to Fig.101 in Power Supply Circuit (P.10).
4.4.4.
Battery Low/Power Down Detector
Circuit Operation:
“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.
4.4.5.
Speakerphone
The hands-free loudspeaker at SP+ and SP- is used to generate the ring alarm.
1.8 V
Reset 
(IC1_61pin)
Battery +
14
KX-TG5511CA/KX-TGA550RU/KX-TGA551RU
4.5.
Circuit Operation (Charger Unit)
4.5.1.
Power Supply Circuit
The power supply is as shown.
R1
TP1
TP2
J1
AC Adaptor
F1
15
KX-TG5511CA/KX-TGA550RU/KX-TGA551RU
4.6.
Signal Route
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)
B - L2 
SP-PHONE TX
(to Tel Line)
 SP-PHONE RX
(to Tel Line)
Caller ID 
(from Tel Line)
(BASE UNIT)
B - L2 - C4 -  R6 - R33 - IC7 (21)        IC7 (77) - R801 (4)  
A - L1 - C3 -  R4 - R35 - IC7 (20)
(BASE UNIT)
IC7 (16) - R116 - R29 - C22 - Q5 - Q3 - D3         L1 - A 
 L2 - B
(BASE UNIT)
A - L1         D3 - Q3 - Q5 - R20 - C56 - R117 - IC7 (18)
(HANDSET)
MIC (+) - R73 - C11 - RA4 - IC1 (20)        IC1(77) - IC801 (4) 
MIC (  ) - R74 - C13 - RA4 - IC1 (19)          IC1(78) - IC801 (3) 
DA801 -  C803 - ANT  to BASE
(BASE UNIT)
from HANDSET   ANT1 - C851         DA802 - C859 - C803 - DA801 - C826 
ANT2 - C853
 IC801(9) - L802 - C812 -
 IC7 (3)  
 IC7 (2) 
IC7 (16) - R116 - R29 - C22 - Q5 - Q3 - D3 
 L2 - B
 L1 - A
L802 - C812 - DA801 - C803- C859 - DA802 
D3 - Q3  - Q5 - R20 - C56 - R117 - IC7 (18)        IC7 (77) - IC801 (4)
 to HANDSET
(HANDSET)
from BASE UNIT   ANT - C803 - DA801 -  C826 
(BASE UNIT)
A - L1      
B - L2
 IC7 (78) - IC801 (3)
  IC801 (9) -
 C851 - ANT1
 C853 - ANT2
IC1 (3)
IC1 (2)
IC1 (16) - RECEIVER (+)
IC1 (15) - RECEIVER (  )
IC7 (78) - R801 (3)
IC801 (9) - L802 - C812 -    
DA801 -  C803 - C859 - DA802       
 to HANDSET
 C851 - ANT1
 C853 - ANT2
(HANDSET)
MIC (+) - R73 - C11 - RA4 - IC1 (20)        IC1(77) - IC801 (4) 
MIC (  ) - R74 - C13 - RA4 - IC1 (19)          IC1(78) - IC801 (3) 
DA801 - C803 - ANT to BASE
(BASE UNIT)
from HANDSET   ANT1 - C851         DA802 - C859 - C803 - DA801 -C826 
ANT2 - C853
 IC801(9) - L802  - C812 -
IC7 (3)  
IC7 (2) 
IC7 (16) - R116 - R29 - C22 - Q5 - Q3 - D3 
 L2 - B
 L1 - A
L802  - C812 - DA801 - C803 - C859 - DA802 
D3 - Q3  - Q5 - R20 - C56 - R117 - IC7 (18)        IC7 (77) - IC801 (4)
 to HANDSET
(HANDSET)
from BASE UNIT   ANT - C803 - DA801 -  C826 
(BASE UNIT)
A - L1      
B - L2
 IC7 (78) - IC801 (3)
  IC801 (9) -
 C851 - ANT1
 C853 - ANT2
IC1 (3)
IC1 (2)
IC1 (33) - SP (-)
IC1 (35) - SP (+)
16
KX-TG5511CA/KX-TGA550RU/KX-TGA551RU
5 Location of Controls and Components
Refer to the Operating Instructions.
Note:
You can download and refer to the Operating Instructions (Instruction book) on TSN Server.
6 Installation Instructions
Refer to the Operating Instructions.
Note:
You can download and refer to the Operating Instructions (Instruction book) on TSN Server.
7 Operating Instructions
Refer to the Operating Instructions.
Note:
You can download and refer to the Operating Instructions (Instruction book) on TSN Server.
7.1.
For Service Hint
Items
Contents
Battery
You could use other rechargeable batteries sold in a market, but the unit is not guaranteed to work 
properly.
The battery strength may not be indicated correctly if the battery is disconnected and connected again, 
even after it is fully charged. In that case, by recharging the battery as mentioned in the Operating  
Instructions, you will get a correct indication of the battery strength.
PIN Code
Change the PIN using the following method. 
1
8 i {#}{1}{3}{2}
2
{*}{7}{0}{0}{0}
3
Enter the new 4-digit base unit PIN. 
i M i {ic}
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