Before using sm320361k 7 paragraph three Yin 11 feet red digital tube, the store to send is sm320361d3b recently, appearance, I checked the is cloudy, but the discovery after two mystery:
Most digital can fully display (including 6,7,9), only 0 of the cross, p, R, G, in the middle of the cross, try (there may be other, not all of them) don't show,
Has ruled out program problem, the same procedures used on other board is no problem,
Want to ask you if digital tube only a total of Yin and Yang are two total? Or is this it seems that the two kinds of the same type but different?

About the buzzer, often appear before sound (boot not ring, start after 1, 2 seconds after the ring; Also has a plug ring), the board voltage is less than 13 v, buzzer with active 12 v (black word of 982), some are not sound, the feeling is luck, tried cleaning, if can solve the problem, but some washing or ring, clean with machine is now considering a try, do you have any ideas with senior or junior partner

Be very grateful!

CodePudding user response:

Can display digital tube paragraphs 6 and 9 are normal,
Possible problem is welded or access to check to see,
Buzzer is not clear,

CodePudding user response:

1, first static display abnormal alphanumeric, level of measuring the corresponding pin is properly
2, buzzer drawings posted, some electrical pins on the MCU is high, some can be set to float the empty, don't know your model, under the oscilloscope measurement rang can make feet level is correct,
Basically have a multimeter and oscilloscope, you can screen out, say simple point digital circuit, measuring level is correct, the timing is correct is about,

CodePudding user response:

Settled, alcohol with ultrasonic cleaning up... The peace of the world