Panasonic KX-MB2571RU Service Manual ▷ View online
29
KX-MB2571RU
F11
LVDS1_VSS
-
GND
F8
LVDS1_VSS
-
GND
F7
LVDS1_VSS
-
GND
K5
LVDS2_AVDD
-
3.3V Power Supply
L5
LVDS2_AVDD
-
3.3V Power Supply
K6
LVDS2_VSS
-
GND
L6
LVDS2_VSS
-
GND
AA14
DRAM_VREF
-
0.75V Power Supply
T11
DRAM_VDD
-
1.5V Power Supply
U16
DRAM_VDD
-
1.5V Power Supply
U15
DRAM_VDD
-
1.5V Power Supply
U14
DRAM_VDD
-
1.5V Power Supply
U13
DRAM_VDD
-
1.5V Power Supply
U12
DRAM_VDD
-
1.5V Power Supply
U11
DRAM_VDD
-
1.5V Power Supply
U10
DRAM_VDD
-
1.5V Power Supply
U9
DRAM_VDD
-
1.5V Power Supply
U8
DRAM_VDD
-
1.5V Power Supply
U7
DRAM_VDD
-
1.5V Power Supply
U6
DRAM_VDD
-
1.5V Power Supply
V11
DRAM_VDD
-
1.5V Power Supply
W11
DRAM_VDD
-
1.5V Power Supply
E17
IO1_VDD
-
3.3V Power Supply
E16
IO1_VDD
-
3.3V Power Supply
E15
IO1_VDD
-
3.3V Power Supply
F17
IO1_VDD
-
3.3V Power Supply
G17
IO1_VDD
-
3.3V Power Supply
E10
IO2_VDD
-
3.3V Power Supply
E9
IO2_VDD
-
3.3V Power Supply
E6
IO2_VDD
-
3.3V Power Supply
E5
IO2_VDD
-
3.3V Power Supply
H5
IO3_VDD
-
3.3V Power Supply
J5
IO3_VDD
-
3.3V Power Supply
P5
IO4_VDD
-
3.3V Power Supply
R5
IO4_VDD
-
3.3V Power Supply
T5
IO4_VDD
-
3.3V Power Supply
U5
IO4_VDD
-
3.3V Power Supply
U17
IO5_VDD
-
3.3V Power Supply
K17
IO6_VDD
-
3.3V Power Supply
L17
IO6_VDD
-
3.3V Power Supply
M17
IO6_VDD
-
3.3V Power Supply
A12
CORE_VDD10
-
1.0V Power Supply
B12
CORE_VDD10
-
1.0V Power Supply
C12
CORE_VDD10
-
1.0V Power Supply
D12
CORE_VDD10
-
1.0V Power Supply
E14
CORE_VDD10
-
1.0V Power Supply
E13
CORE_VDD10
-
1.0V Power Supply
E12
CORE_VDD10
-
1.0V Power Supply
H17
CORE_VDD10
-
1.0V Power Supply
J17
CORE_VDD10
-
1.0V Power Supply
M5
CORE_VDD10
-
1.0V Power Supply
N17
CORE_VDD10
-
1.0V Power Supply
N5
CORE_VDD10
-
1.0V Power Supply
P17
CORE_VDD10
-
1.0V Power Supply
R17
CORE_VDD10
-
1.0V Power Supply
F16
VSS
-
GND
F15
VSS
-
GND
F14
VSS
-
GND
F13
VSS
-
GND
F12
VSS
-
GND
F10
VSS
-
GND
F9
VSS
-
GND
G6
VSS
-
GND
G16
VSS
-
GND
G15
VSS
-
GND
G14
VSS
-
GND
G1
VSS
-
GND
Pin No.
Pin Name
I/O
Function
Signal Name
30
KX-MB2571RU
G12
VSS
-
GND
G11
VSS
-
GND
G10
VSS
-
GND
G9
VSS
-
GND
G8
VSS
-
GND
H16
VSS
-
GND
H15
VSS
-
GND
H14
VSS
-
GND
H13
VSS
-
GND
H12
VSS
-
GND
H11
VSS
-
GND
H10
VSS
-
GND
H9
VSS
-
GND
H8
VSS
-
GND
H7
VSS
-
GND
H6
VSS
-
GND
J16
VSS
-
GND
J15
VSS
-
GND
J14
VSS
-
GND
J13
VSS
-
GND
J12
VSS
-
GND
J11
VSS
-
GND
J10
VSS
-
GND
J9
VSS
-
GND
J8
VSS
-
GND
J7
VSS
-
GND
J6
VSS
-
GND
K16
VSS
-
GND
K15
VSS
-
GND
K14
VSS
-
GND
K13
VSS
-
GND
K12
VSS
-
GND
K11
VSS
-
GND
K10
VSS
-
GND
K9
VSS
-
GND
K8
VSS
-
GND
K7
VSS
-
GND
L16
VSS
-
GND
L15
VSS
-
GND
L14
VSS
-
GND
L13
VSS
-
GND
L12
VSS
-
GND
L11
VSS
-
GND
L10
VSS
-
GND
L9
VSS
-
GND
L8
VSS
-
GND
L7
VSS
-
GND
M16
VSS
-
GND
M15
VSS
-
GND
M14
VSS
-
GND
M13
VSS
-
GND
M12
VSS
-
GND
M11
VSS
-
GND
M10
VSS
-
GND
M9
VSS
-
GND
M8
VSS
-
GND
M7
VSS
-
GND
M6
VSS
-
GND
N16
VSS
-
GND
N15
VSS
-
GND
N14
VSS
-
GND
N13
VSS
-
GND
N12
VSS
-
GND
N11
VSS
-
GND
N10
VSS
-
GND
N9
VSS
-
GND
N8
VSS
-
GND
Pin No.
Pin Name
I/O
Function
Signal Name
31
KX-MB2571RU
N7
VSS
-
GND
N6
VSS
-
GND
P16
VSS
-
GND
P15
VSS
-
GND
P14
VSS
-
GND
P13
VSS
-
GND
P12
VSS
-
GND
P11
VSS
-
GND
P10
VSS
-
GND
P9
VSS
-
GND
P8
VSS
-
GND
P7
VSS
-
GND
P6
VSS
-
GND
R16
VSS
-
GND
R15
VSS
-
GND
R14
VSS
-
GND
R13
VSS
-
GND
R12
VSS
-
GND
R11
VSS
-
GND
R10
VSS
-
GND
R9
VSS
-
GND
R8
VSS
-
GND
R7
VSS
-
GND
R6
VSS
-
GND
T15
VSS
-
GND
T14
VSS
-
GND
T13
VSS
-
GND
T12
VSS
-
GND
T10
VSS
-
GND
T9
VSS
-
GND
T8
VSS
-
GND
T7
VSS
-
GND
T6
VSS
-
GND
W19
VSS
-
GND
W16
VSS
-
GND
W7
VSS
-
GND
W4
VSS
-
GND
G7
NC
-
T16
NC
-
G1
NC
-
G2
NC
-
G3
NC
-
G4
NC
-
Pin No.
Pin Name
I/O
Function
Signal Name
32
KX-MB2571RU
6.3.2.
RTC Backup Circuit
1. Function
This unit has a lithium battery (BAT300) which works for the Real Time Clock IC (RTC: inside IC300).
The RTC continues to work, backed up by a lithium battery even when the power switch is OFF.
*RTC: (Real Time Clock)
Chip for the clock mounted on the motherboard.
Receiving power supply to operate even while the power is off unlike the other chips on the motherboard.
The RTC continues to work, backed up by a lithium battery even when the power switch is OFF.
*RTC: (Real Time Clock)
Chip for the clock mounted on the motherboard.
Receiving power supply to operate even while the power is off unlike the other chips on the motherboard.
2. RTC Inside (IC300) Backup Circuit Operation
When the power switch is turned ON, power is supplied to the RTC (inside IC300). At this time, the voltage at pin C18 of the
IC300 is +3.0V. When the power switch is turned OFF, the BAT300 supplies power to RTC through D300.
When the power switch is OFF and the voltage of +3.0V decreases, pin C18 of RTC (IC300) becomes roughly the same volt-
age as the battery voltage. RTC goes into the backup mode, in which the power consumption is lower.
IC300 is +3.0V. When the power switch is turned OFF, the BAT300 supplies power to RTC through D300.
When the power switch is OFF and the voltage of +3.0V decreases, pin C18 of RTC (IC300) becomes roughly the same volt-
age as the battery voltage. RTC goes into the backup mode, in which the power consumption is lower.
6.3.3.
Modem Circuit Operation
The modem (IC203) has all the hardware satisfying the CCITT standards mentioned previously.
ALL processing is controlled by the modem (IC203) according to CCITT procedures.
This modem (IC203) has an automatic application equalizer. With training signal 1 or 2 at the time of G3 reception, it can automati-
cally establish the optimum equalizer.
ALL processing is controlled by the modem (IC203) according to CCITT procedures.
This modem (IC203) has an automatic application equalizer. With training signal 1 or 2 at the time of G3 reception, it can automati-
cally establish the optimum equalizer.
Facsimile Transmission/DTMF Line Send
The digital data are sent from P-DIB pins on the modem (IC203) to the line side DAA (IC101) through the DIB transformer
(T100), then converted to the analog signals in the line side DAA (IC101).
The analog signals are sent from TXO(8)/TXF(7) on the IC100 to the telephone line through the NCU section.
(T100), then converted to the analog signals in the line side DAA (IC101).
The analog signals are sent from TXO(8)/TXF(7) on the IC100 to the telephone line through the NCU section.
Facsimile Reception
The analog image data which is received from the telephone line passes through the NCU section and enters line side DAA
(Direct Access Arrangement) IC101. The signals are changed to digital data in IC101. In this case, the image signals from the
telephone line are transmitted serially. Here, the internal equalizer circuit reduces the image signals to a long-distance receiving
level. This is designed to correct the characteristics of the frequency band centered around 3kHz and maintain a constant
receiving sensitivity.
(Direct Access Arrangement) IC101. The signals are changed to digital data in IC101. In this case, the image signals from the
telephone line are transmitted serially. Here, the internal equalizer circuit reduces the image signals to a long-distance receiving
level. This is designed to correct the characteristics of the frequency band centered around 3kHz and maintain a constant
receiving sensitivity.
Busy/Dial Tone Detection
The path is the same as Facsimile Reception.
Call Tone Transmission
This is the call signal which is generated the modem (IC203) and sent to the speaker.
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