Panasonic KX-UDT111RU (serv.man3) Service Manual ▷ View online
9
KX-UDT111RU
4.2.6.
Charge circuit (Include Charger)
Circuit Operation:
When charging with Charger, the charge current is as follows:
DC+(5.5V)
DC+(5.5V)
→ CHARGE+(Charger) → CHARGE+(Handset) → L200 → D200 → Q204 → F201 → BATTERY+... BATTERY- →
R201
→ GND
In this way, the BBIC(IC1) on Handset detects the fact that the battery is charged.
The charge current is controlled by IC1 23pin of Handset.
The charge current is controlled by IC1 23pin of Handset.
Refer to in Power Supply Circuit / Reset Circuit (P.7) .
After CHG_DET became High, CHG_CTRL begins charge control.
Charge current is controlled as follows.
Charge current is controlled as follows.
Charge current repeats ON and OFF as follows.
4.2.7.
Battery Low/Power Down Detector
"Battery Low" and "Power Down" are detected by APUZ (IC1) which checks the battery voltage.
The detected voltage is as follows;
The detected voltage is as follows;
• Battery Low
Battery voltage: V(Batt) 2.35V ± 50mV
• Power Down
After battery low, it goes to power down automatically 1 minute later.
IC1-23pin (CHG_CTRL)
Q201
Q200
Q204
Charge ON
High
ON
ON
ON
Charge OFF
Low
OFF
OFF
OFF
Charger
CHG_CUR
CHG_CTRL
CHG_DET
R201
C213
GND
GND
GND
GND
GND
GND
L200
L201
GND
C211
NC
C214
CHG_CTRL
C201
GND
GND
GND
GND
C202
C206
IC200
NC
4
VSS
3
NC
1 OUT
2 VDD
CHG_DET
F201
GND
Q205
Q200
R205
R206
R208
R210
R211
R207
C207
C209
R219
C203
C204
C221
C222
GND
GND
CHG(+)
CHG(-)
BATT+
BATT-
Q204
D200
C216
GND
GND
GND
R214
CHG+
CHG-
Q201
Q203
R215
C205
R209
R213
C212
To Charge
Terminal
Terminal
To Battery
IC1
J1
(DC Jack)
CHG+
CHG-
Charger
Handset
Charge Current
23
24
10
KX-UDT111RU
4.2.8.
LCD Circuit
• The LCD is controlled by SPI (LCD_SCL, LCD_RESET, LCD_CS, LCD_SID, LCD_CD).
• LCD back-light has 3 modes ( Brightness 1/2/3*) and back-light OFF.
• LCD back-light has 3 modes ( Brightness 1/2/3*) and back-light OFF.
*Brightness level: Brightness 1 > Brightness 2 > Brightness 3
Back-light Mode
IC100-17pin (CP_ON)
IC100-15pin (LCD_BL1)
IC100-16pin (LCD_BL2)
Brightness 1
High
High
High
Brightness 2
High
High
Low
Brightness 3
High
Low
Low
Back-light OFF
Low
Low
Low
11
KX-UDT111RU
4.2.9.
LED Circuit
• DPU(IC100) controls each LEDs.
4.2.10. Vib Circuit
• Vibrator is controlled by IC1-10 pin.
Type of LED
LED ON
LED OFF
Bell LED (Green)
LED531
LED531
IC100-128pin = High
(Q525 = ON)
(Q525 = ON)
IC100-128pin = Low
(Q525 = OFF)
Bell LED (RED)
LED530
LED530
IC100-97pin = High
(Q520 = OFF)
(Q520 = OFF)
IC100-97pin = Low
(Q520 = ON)
(Q520 = ON)
Key back-light LEDs (Yellow green)
LED520 - LED529
LED520 - LED529
IC100-16pin = High
(Q521 = ON)
(Q521 = ON)
IC100-16pin = Low
(Q521 = OFF)
(Q521 = OFF)
VIB ON
VIB OFF
IC1-10 pin (Q540)
High
(ON)
Low
(OFF)
12
KX-UDT111RU
4.2.11. RF Circuit
Reception
A digital voice signal from LAN is received as "TX_DATA" (*1) by DMW in a cell station.
Then TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected
antenna by antenna diversity .
Then TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected
antenna by antenna diversity .
As for a portable station, RF signal of cell station is received in two antennas.
RFIC(IC1) of portable station compares RF signal levels from cell station and selects the antenna to be used.
RX signal in the selected antenna is amplified and down-converted to 864 kHz IF signal, then demodulated to digital data
"RX_DATA".
RFIC(IC1) converts RX_DATA into a voice signal and outputs it to speaker.
RFIC(IC1) of portable station compares RF signal levels from cell station and selects the antenna to be used.
RX signal in the selected antenna is amplified and down-converted to 864 kHz IF signal, then demodulated to digital data
"RX_DATA".
RFIC(IC1) converts RX_DATA into a voice signal and outputs it to speaker.
Transmission
A voice signal from microphone is encoded to digital data "TX_DATA" by RFIC(IC1) in a portable station.
TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected antenna by
antenna diversity.
TX_DATA goes to RF part, and it's modulated to 1.9 GHz RF signal. The RF signal is amplified and fed to a selected antenna by
antenna diversity.
As for a cell station, RF signal is received in two antennas.
RFIC of cell station compares RF signal levels from portable station and selects the antenna to be used.
RX signal in the selected antenna is amplified and down-converted to 864 kHz IF signal, then demodulated to digital data
"RX_DATA".
DMW is received RX_DATA (*1) as a voice signal from portable station and outputs it to LAN.
RFIC of cell station compares RF signal levels from portable station and selects the antenna to be used.
RX signal in the selected antenna is amplified and down-converted to 864 kHz IF signal, then demodulated to digital data
"RX_DATA".
DMW is received RX_DATA (*1) as a voice signal from portable station and outputs it to LAN.
Note:
(*1) TX_DATA and RX_DATA are bundled to one signal as "RXTXDATA" of DMW in cell station.
TX_RF
RX_RF
Antenna diversity
TX_RF
RX_RF
VBAT
LNA_INN
ANT2
ANT1
RX_SW
TX_SW
BAL_OUT1
C3
BAL_OUT2
GND
LNA_INP
VCC_PA
ATSTN
ATSTP
C1
RSTN
38
TEST
39
RX_SW
40
LNA_INN
30
VCC_FE_IF
31
VCC_PA
32
BAL_OUT2
33
BAL_OUT1
41
LNA_INP
42
ATST_N
43
ATST_P/EXT_LNA
44
RSTN
45
VCC_VCO
46
ON_OFF
47
ON_OFF_OUT
48
IF_T_DATA
49
IF_MLSE
50
IF_RX1
51
IF_NPORST
36
GND_RF
37
ANT2
34
TX_SW
35
ANT1
TO RF BLOCK
IC1
GND
RX_SW
LNA_INP
TX_SW
BAL_OUT2
LNA_INN
GND
GND
GND
GND
GND
GND
GND
GND
ANT2
ANT1
GND
GND
GND
GND
ANT_TP2
1
2
ANT_TP1
1
2
BAL_OUT1
GND
GND
VCC_PA
GND
GND
GND
C36
L32
C55
GND
CL1
C39
C43
C48
C50
C31
C33
GND
GND
D50
GND
D51
GND
L38
L42
C52
GND
GND
L30
L46
GND
GND
L44
R50
C32
L33
C47
L31
C41
C42
L35
L36
L45 10p
L43
C30
C38
C53
C37
C35
C34
L34
C46
C45
C44
ANT2(Main)
GAP
Click on the first or last page to see other KX-UDT111RU (serv.man3) service manuals if exist.