MBT Maliza shoes DR

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one module signal introduced
1, supply voltage: DC5V
2, the data interface mode: T12, 8 lines in each district, each district 8, the data, OE active high.
3, input signal: A, B, OE, DR, STB, CLK, GND
4, the input signal description: A and B for the scan signal (the module is 1 / 4 scan), OE is the can, DR for data, STB is latched, CLK is the clock, GND is ground (negative power)
II, IC introduction (can go online for further information)
1, U1 is the 74HC245, U2 and U3 is 4953, U4 is the 74HC138,women MBT Voi Black, UR1-UR16 is the 74HC595
2, 74HC245 function is to amplify the signal, all of the input signal must go through the IC. Sometimes a problem with the entire board,MBT Maliza shoes, or not to transmit this IC may be damaged or Weld.
3, 4953 is to control the line, the horizontal direction if the board is faulty and the entire line is usually the fault of this IC. A 4953 control line 8.
4, 74HC138 function is to control scan,MBT Fora black Shoes This is a very useful map, the input A, B and OE signal output 4 signals to control the two 4953.
5, 74HC595 function is to control column is displayed, enter the STB, CLK, and DR signals to control the output signal 8 W * 8 lights 4 lights high.
outdoor module fault maintenance (to P10-1R example)
1, the entire board is not lit: ● board is not connected to the power; ● Enter the row INSERT; ● Input and output reverse; ● power supply positive and negative poles anti-(anti-burn out the board then all IC).
2, the normal transmission of the board does not shine: protection circuit solutions can damage the 74HC138 4 feet and 5 feet short.
3, every three lines of a line does not shine: ● 4953 damage (is one of the damage).
4, every other line of bright line: A signal of the problem, check whether there Weld 74HC245 and 74HC138; can use multi-meter 74HC138 pin 1 voltage is equal to 2.5V or so, if there is change 74HC138; careful with the amount of lily ICA signal path situation.
5, two lines of light across two lines: B signals, check whether there Weld 74HC245 and 74HC138; can use multi-meter 74HC138 pin 2 voltage is equal to 2.5V or so, if there is change 74HC138; careful with the amount of lily ICA signal path situation.
6, normal upper half board full board on or off: If T08A interface has this situation, it is under 8 should check whether the data signal line of DR pathways, such as normal be replaced as well, to replace the 74HC245 The first 74HC595.
7, half-board and under this board Banban STB and CLK signals are common, the data are separated (if the interface data is a T12). If the board is to check the T08A to separate the upper and lower half-board inspection.
8, if the board has a light is not lit: Check Weld, and replace the lamp.
9, there are four vertically does not light: the first check whether there Weld 74HC595; second replacement 74HC595; third lamp replacement.
10, the vertically four light does not shine, there are three had a normal: normal sinking tube replacement.
11, such as the board back from the middle or other location not display properly: Check the data signal path situation; replacement lamps last a normal display and control the 74HC595; if not rule out the replacement of the first to show abnormal signal-controlled 74HC595. 74HC595 control the width of each 8 * 4 tall lamp. 74HC595 data signal is in series with the DR is DR signals up the first 14 feet from the 74HC595 to 9 feet out into the receipt of a 74HC595 under section 14 feet to the end of a 74HC595. For example DR data from the lilies of the board to 74HC345 amplified to the UR2 UR1 to UR3 until UR8 to the output after the lily.
12, sometimes in the process of commissioning of the entire screen in front of the module to the back of the module display is not normal, the general failure is the ribbon cable is not plugged or damaged; also use slightly longer cable is check the following module cable into the module above the abnormal up to see shows how you can put the above normal is not normal at the front of module output to the next row of display module to see how to determine in the end is that the module out of the question.