Symptom 1: A unit board is not lit
The cause of the failure: 1, no +5v; 2, the data line is bad
Fault analysis and processing: 1, the power supply is bad, replace the power supply;
1, replace the data line
Symptom 2: The whole screen is not bright
cause of issue:
1, the main controller does not have +5v;
2. The entire screen of AC power is not available;
3, the computer settings are wrong
Fault analysis processing:
1. The power supply is broken and the power supply is replaced.
2. Check the power supply circuit;
3. Reset it.
Symptom 3: A unit is red (or green)
cause of issue:
1. There is a problem with the data line connecting this unit;
2. There is a problem with the corresponding distribution board;
3, a fast unit board failure
Fault analysis processing:
1. Re-insert the data line and pay attention to the direction;
2, change a data line;
3. Replace the distribution plate;
4, the root exchange unit board
Symptom 4: Communication is not normal
cause of issue:
1. Is the software set correctly?
2. Whether the communication line is connected;
3, there is a problem with MAX323
Fault analysis processing:
1. Restart the computer and switch the display back on.
2. Re-set it.
3. Measure with a digital meter.
4. Replace this MAX232.
Fault phenomenon 5: The whole screen is separated by a few lines in the horizontal direction, and the lines are not bright.
The cause of the failure: the network cable is not plugged in well.
Fault analysis and processing: plug the network cable
Symptom 6: Large screen display is normal, computer black screen
Cause: The computer settings are incorrect.
Fault analysis processing: reset
Symptom 7: The first few screens are normal, and the last few screens are abnormal.
cause of issue:
1. The capacity of the screen is limited, and the information sent is too much;
2, 2, the storage device is not erased
Fault analysis processing:
1. Resend, minus some unnecessary information;
2, resend
Symptom 8: Information is right, but the font is missing strokes
Cause: The size of the information and the size of the screen are inconsistent.
Fault analysis processing: Re-do information, the size should be set to match the size of the screen.