DOWNLOAD Panasonic DP-MB545 / DP-MB537 / DP-MB536 / DA-FAP109 / DA-FAP110 Service Manual ↓ Size: 50.57 MB | Pages: 127 in PDF or view online for FREE

41

DP-MB545/537/536 series

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

42

DP-MB545/537/536 series

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

43

DP-MB545/537/536 series

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.

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.

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 automatically establish the optimum equalizer. 

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.

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.

The path is the same as Facsimile Reception.

This is the call signal which is generated the modem (IC203) and sent to the speaker.

44

DP-MB545/537/536 series

Composed of ITS circuit and NCU circuit.

The analog section works as an interface between the telephone line.
DAA control ITS circuit and NCU circuit.
DAA control signals are output from modem (IC203) through the DIB transformer (T100). 

[NCU]: Network Control Unit the NCU comprises of the following; DC loop forming circuit to connect with the telephone line;
Switching circuit for other interconnected telephones; Bell detection circuit.
Refer to NCU Section (P.47) for the details.