DOWNLOAD Panasonic KX-MB1536RUB Service Manual ↓ Size: 15.38 MB | Pages: 127 in PDF or view online for FREE

25

KX-MB1536RU

M11

VSS

-

GND

M12

VSS

-

GND

M13

VSS

-

GND

M14

VSS

-

GND

M15

VSS

-

GND

M16

VSS

-

GND

N11

VSS

-

GND

N12

VSS

-

GND

N13

VSS

-

GND

N14

VSS

-

GND

N15

VSS

-

GND

N16

VSS

-

GND

P11

VSS

-

GND

P12

VSS

-

GND

P13

VSS

-

GND

P14

VSS

-

GND

P15

VSS

-

GND

P16

VSS

-

GND

R11

VSS

-

GND

R12

VSS

-

GND

R13

VSS

-

GND

R14

VSS

-

GND

R15

VSS

-

GND

R16

VSS

-

GND

T11

VSS

-

GND

T12

VSS

-

GND

T13

VSS

-

GND

T14

VSS

-

GND

T15

VSS

-

GND

T16

VSS

-

GND

U3

VSS

-

GND

U4

VSS

-

GND

V3

VSS

-

GND

W3

VSS

-

GND

Y4

VSS

-

GND

Pin No.

Pin Name

I/O

Description

26

KX-MB1536RU

1. Function

This unit has a lithium battery (BAT50) 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.

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 AF7 of the
IC300 is +3.3V. When the power switch is turned OFF, the BAT50 supplies power to RTC through DA300. 
When the power switch is OFF and the voltage of +3.3V decreases, pin AF7 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.

27

KX-MB1536RU

The modem (Included IC300) has all the hardware satisfying the CCITT standards mentioned previously.
ALL processing is controlled by the SOC (IC300) according to CCITT procedures.
This modem (Included IC300) 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 image data sent on ATXD line from modem (Included IC300).
DAA IC100 (6

→

9,10), Line side DAA IC101 and the NCU section to the telephone line.

The analog image data which is received from the telephone line passes through the NCU section and enters line side DAA
(Direct Access Arrangement) IC100. The signals are changed to digital data in IC101 (5,6), IC100 (9,10

→

5) and IC300. 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 SOC (IC300) and sent to the speaker.

28

KX-MB1536RU

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 SOC (IC300).

[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; Remote fax activation circuit.
Refer to NCU Section (P.30) for the details.