DOWNLOAD Panasonic KX-TG8521CAB / KX-TGA850RUB Service Manual ↓ Size: 3.71 MB | Pages: 90 in PDF or view online for FREE

Model
KX-TG8521CAB KX-TGA850RUB
Pages
90
Size
3.71 MB
Type
PDF
Document
Service Manual
Brand
Device
Telephone / DIGITAL CORDLESS ANSWERING SYSTEM
File
kx-tg8521cab-kx-tga850rub.pdf
Date
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Panasonic KX-TG8521CAB / KX-TGA850RUB Service Manual ▷ View online

13
KX-TG8521CAB/KX-TGA850RUB
4.5.
Circuit Operation (Handset)
4.5.1.
Outline
Handset consists of the following ICs as shown in Block Diagram (Handset) (P.11).
• DECT BBIC (Base Band IC): IC1
- All data signals (forming/analyzing ACK or CMD signal)
- All interfaces (ex: Key, Detector Circuit, Charge, EEPROM, LCD)
• EEPROM: IC3
- Setting data is stored. (e.g. ID, user setting)
4.5.2.
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 → BBC1 (IC1) 10 pin
The Reset signal generates IC1 (54 pin) and 1.8 V.
Startmonitor
(IC1 57pin)
VDDC (1.2 V)
VBAT
Reset (RSTN) 
(IC1_54 pin)
BBIC chip initialize
(CKM/STM)
GND
BATTERY
2CELL
BBIC
3.0V
3.0V
DOUBLER OUT (Charge Pump)
For all peripherals
3.0V
3.0V
EEPROM
GND
LCD BACKLIT LED
KEY LED
4.0V
GND
4.0V
GND
BELL
3.0V
4.0 output
External Charge Pump 
Circuit or IC
4.0V
VBAT
VBAT
VDDC (1.2V)
3.0V
3.0V
LCD
14
KX-TG8521CAB/KX-TGA850RUB
4.5.3.
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.9).
4.5.4.
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)   2.35 V ± 50 mV
The BBIC detects this level and "
" starts flashing.
• Power Down
Battery voltage: V(Batt)   2.10 V ± 50 mV
The BBIC detects this level and power down.
4.5.5.
Speakerphone
The hands-free loudspeaker at SP+ and SP- is used to generate the ring alarm.
15
KX-TG8521CAB/KX-TGA850RUB
4.6.
Circuit Operation (Charger Unit)
4.6.1.
Power Supply Circuit
The power supply is as shown.
R1
TP1
TP2
J1
AC Adaptor
F1
16
KX-TG8521CAB/KX-TGA850RUB
4.7.
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
(from 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 (23)        IC1(45)  
MIC (  ) - R74 - C13 - RA4 - IC1 (22)          IC1(44)
- ANT  to BASE
(BASE UNIT)
from HANDSET   ANT1 - C851         DA802 - C859 - C803 - DA801 - C826 
ANT2 - C853
     
 L809 - C812 - DA801 -  C895
 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 - C895 - DA801 -  C826 
(BASE UNIT)
A - L1      
B - L2
 IC7 (78) - IC801 (3)
  IC801 (9) -
 C851 - ANT1
 C853 - ANT2
IC1 (47)
IC1 (46)
IC1 (27) - L9 - RECEIVER (+)
IC1 (28) - L3 - C86 - L74 - CN4 (5-4) - R11 - 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 (23)        IC1(45)  
MIC (  ) - R74 - C13 - RA4 - IC1 (22)          IC1(44) 
DA801 - C895 - ANT to BASE
(BASE UNIT)
from HANDSET   ANT1 - C851         DA802 - C859 - C803 - DA801 -C826 
ANT2 - C853
     
 L809  - 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 - C895- DA801 -  C826 
(BASE UNIT)
A - L1      
B - L2
 IC7 (78) - IC801 (3)
  IC801 (9) -
 C851 - ANT1
 C853 - ANT2
IC1 (47)
IC1 (46)
IC1 (29) - SP (-)
IC1 (31) - L13 - SP (+)
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