DOWNLOAD Panasonic KX-TGF310RUM / KX-TGF320RUM / KX-TGF320UCM / KX-TGFA30RUM Service Manual ↓ Size: 9.24 MB | Pages: 116 in PDF or view online for FREE

Model
KX-TGF310RUM KX-TGF320RUM KX-TGF320UCM KX-TGFA30RUM
Pages
116
Size
9.24 MB
Type
PDF
Document
Service Manual
Brand
Device
Telephone / DIGITAL CORDED/ CORDLESS PHONE
File
kx-tgf310rum-kx-tgf320rum-kx-tgf320ucm-kx-tgfa30ru.pdf
Date
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Panasonic KX-TGF310RUM / KX-TGF320RUM / KX-TGF320UCM / KX-TGFA30RUM Service Manual ▷ View online

17
KX-TGF310RUM/KX-TGF320RUM/KX-TGF320UCM/KX-TGFA30RUM
4.7.
Block Diagram (Handset_RF Part)
KX-TGFA30 BLOCK DIAGRAM (Handset_RF Part)
RXp
RXn
ANT
TXp
TXn
18
KX-TGF310RUM/KX-TGF320RUM/KX-TGF320UCM/KX-TGFA30RUM
4.8.
Circuit Operation (Handset)
4.8.1.
Outline
Handset consists of the following ICs as shown in Block Diagram (Handset) (P.16).
• 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)
4.8.2.
Power Supply Circuit/Reset Circuit
Circuit Operation:
When powering 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.
Start monitor
(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
LCD BACKLIT LED
GND
KEY LED
3.0V
4.0 output
External Charge Pump 
Circuit or IC
4.0V
VBAT
VBAT
VDDC (1.2V)
3.0V
3.0V
LCD
19
KX-TGF310RUM/KX-TGF320RUM/KX-TGF320UCM/KX-TGFA30RUM
4.8.3.
Charge Circuit
Circuit Operation:
Charge +(charger) 
 CHARGE +(Handset)  R8 Q3  F1  BATTERY(+) BATTERY(-)  R45  GND  
CHARGE -(Handset)
 Charge -(charger) 
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/Reset Circuit (P.13).
4.8.4.
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)   2.1 V ± 50 mV
The BBIC detects this level and power down.
4.8.5.
Speakerphone
The hands-free loudspeaker at SP+ and SP- is used to generate the ring alarm.
CHG +
Q4
R45
R4
47K
  R6
10K
Q9
GND
R7
CHG DET (34)
CHG CTRL (32)
100K
CHG -
GND
BATT +
BATTERY
2CELL
BATT -
GND
BBIC
IC1
Q2
  R8
Q3
C27
R2
R9
20
KX-TGF310RUM/KX-TGF320RUM/KX-TGF320UCM/KX-TGFA30RUM
4.9.
Circuit Operation (Charger Unit)
Charge control is executed at handset side so that the operation when using charger is also controlled by handset.
Refer to Circuit Operation (Handset) (P.18)
The route for this is as follows: DC+pin of J1(+) 
 CHARGE+pad  Handset  CHARGE-pad  DC-pin of J1(-).
TP1
TP2
J1
AC Adaptor
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