The positive active material is mainly made of nickel, and the negative active material is mainly an alkaline battery made of cadmium.The nickel-cadmium battery used in AGV car has large internal resistance and can be used for large current discharge.Compared with other kinds of batteries, nickel-cadmium batteries can withstand overcharge or overcharge, and the operation is simple and convenient.The discharge voltage is somewhat different according to the discharge current. In general, the discharge termination voltage of about 1.2v nickel-cadmium battery is 1.0v /CELL, and the actual operating temperature ranges from -20 degrees to 60 degrees. In this range, the discharge can be repeated for more than 500 times.
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LED display common problems and analysis
Cell board missing color - display abnormal
Check 245 RG data for output
Check if the normal 595 output pin is connected to the abnormal 595 input pin.
Possible problems and solutions in the driver part
One unit board is not lit
Problem: 1, +5V power or GND Is the solution available: Give +5V to power or GND
Question: 2, +5V and GND are short-circuited. Solution: Disconnect the short circuit.
Question: 3, 138 Whether the OE signal of the fifth leg has a solution: supply the OE signal
Question: 4, 245 connected OE signal is normal (open circuit or short circuit) Solution: disconnect the open circuit to disconnect the short circuit
The upper half or the lower half of a unit is not lit or is not displayed properly.
Question: Is there a solution for the 5th leg OE signal of 1, 138: Connect the OE signal
Question: 2, the signals of the 11th and 12th legs of the 74HC595 are normal; (SCLK, RCK) Solution: Connect the SCLK and RCK signals.
Question: 3, whether the connected OE signal is normal; (open circuit or short circuit) Solution: disconnect the short circuit and disconnect the short circuit.
Question: 4, whether the double-row pin and 245 connected SCLK and RCK signals are normal; (open circuit or short circuit) Solution: disconnect the short circuit and disconnect the short circuit.
A row on a cell board or a corresponding module is not lit or not displayed properly
Question: 1. Check whether the pin of the row signal of the corresponding module is soldered or leaked. Solution: Weld the solder joint and the solder joint.
Question: 2, check whether the line signal and the corresponding pin of the 4953 are disconnected or shorted with Other signals. Solution: disconnect the short circuit and disconnect the short circuit.
Question: 3, check whether the upper and lower pull-down resistors of the row signal are not soldered or missed. Solution: Weld the solder without soldering.
Question: 4, whether the line signal output by 74HC138 is disconnected from the corresponding 4953 or shorted with other signals. Solution: disconnect the short circuit and disconnect the short circuit.
One unit board has two lines at the same time (one line is normal and one line is always on when displaying text)
Question: 1. Check whether the two lines corresponding to the module are short-circuited. Solution: Disconnect the short circuit.
Question: 2, check to see the output leg of 138, the pull-up resistor and the module pin and the 4953 short circuit solution: disconnect the short circuit
The upper half or lower half of the red or green light or does not display properly
Problem: 1. Check if the input pin is normal or shorted to GND and +5V. Solution: Connect the open circuit.
Question: 2, check whether the signal between the input pin and 245 is normal (short circuit or open circuit). Solution: Disconnect the short circuit.
Problem: 3, IC245 bad solution: replace the IC