Panasonic KX-TDA200BX Service Manual Download

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8 OUTLINE

8.1. GENERAL DESCRIPTION

The control system of the main unit is composed of the main central processing card (MPR card) controlling the entire system
and exchanging voice data, the circuit control section (LPR/LC) controlling various telephone lines and the power supply section
(POWER).

MPR card, LPR/LC and POWER are connected each other through the System BUS (ADDRESS BUS, DATA BUS and
CONTROL BUS). MPR card and LPR/LC are under I/O control (I/O Read/W rite) by MPR card.

MPR card controls LPR which have a microprocessor by the lnter-Microprocessor Communication System supported by ASIC.
Those are, MPR card and LPR exchange controlling messages through bi-directional buffer and CPU controls LPR so that it
can manage multiple telephone lines. Since LC does not have a microprocessor, it is completely controlled through ASIC from
MPR card.

I/O address for LPR access is fixed for each free slot. CPU discriminates the sort of LPR through the inter-processor
communication system.

POWER detects the voltage drop of the AC input and the DC output and transfers it to MPR card.

8.1.1. MPR Card

This card is the main control section of main unit. It controls all the cards mounted on the free slots, and communication of RS-
232C ports.

There are two LED (BATT ALARM, SD ACCESS), one SD card slot, one push switch, one slide switch, one USB port, two MOH
jacks, and two EPG jacks in the front of MPR card. BATT ALARM LED light red if the output of the lithium battery in MPR card
is set to about 2.8V or less. During access to SD card, it green-blinks or SD ACCESS LED light and blink. Enclosed SD card
is used for SD card slot on a main part, putting in. The main program is stored in SD card. It connects with PC and a USB port
is used for a maintenance or a system setup. The external sound source for BGM or suspension sound is connected to a MOH
jack. A speaker with amplifier is connected to external paging at an EPG jack. Light Emitting Diode (RUN indicator,
ALARMindicator) arranged at the main part upper part is directly controlled from MPR card, and shows the state of a system
of operation.

This control circuit executes the control signals for the exchange process, and this card is composed of the following

(A) 32bit CPU (32bit data bus)

(B) SDRAMs, SRAMs

(D) Lithium Battery for back-up of clock IC and Static RAMs

8.1.2. Back Board

BB (back board) is the mother board of the basic shelf. This board connects each card/unit (POWER, MPR card, and optional
service cards) together. This board has one RS-232C connector.

8.1.3. Power Supply Unit

This unit is switching regulator power supply and supplies DC voltages to MPR card, and optional service card (free slot). PSU
(power supply unit) has four outputs (40V, 30V, 15VPT, 15V). 15V output is supplied only in MPR card and option card. Other
outputs are mainly used as an object for the electric supply to a terminal. Refer to each S/M for the details of PSU.

KX-TDA200BX