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<strong>KX</strong>-<strong>TDA100BX</strong><br />
clock block power.<br />
BAT401, which is a lithium battery for memory backup, is connected to the power supply of IC301, IC302 (SRAM) via D408,<br />
D409.<br />
IC411 compares BAT401 output voltage to the reference voltage (about 2.8V) and drives LED (BATALM) that indicates<br />
dropping of backup voltage.<br />
IP401 and IP402 block the line respectively when over current flows to +15V and +3.3V line.<br />
10 BACK BOARD CIRCUIT OPERATION<br />
The back board (BB) connects signals between all cards in main unit. It also supplies power from the power supply unit (PSU)<br />
to the cards.<br />
CONNECTORS EXPLANATION<br />
(1) Power Supply Unit Connector: CN100<br />
(2) Free Slot Connectors: CN103-CN106<br />
(3) Option Card Slot Connector: CN107<br />
(4) MPR Card Connector: CN112<br />
(5) RS-232C Connector: CN113<br />
CN113 is connected to D-Sub connector in front of the product.<br />
(6) LED Connector: CN114<br />
CN114 is connected to LED Board on the product.<br />
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