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Помощь. Нужна схема платы ldd23


Алiна Тагiльцева
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Fuji didn't give internal circuit diagram of this board. If board is not working need buy other board and change it. 

Not all LEDs on board should be light. LEDs D1 - D5 are just internal. State not described on service manual. Just see, that D1 - D4 connected to one SN74LV240APW channel ( pin 12, 14, 16 and 18 ) and D5 is connected to other channel ( pin 9 ) . Output enable signals on both channels are connected to ground, so LED5 is light, or dark depends on SN74LV240APW pin 11. It is connected to Altera programmable logic EPM3064ATC100-10N pin 97. Only board makers know, what they programmed here.

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