| Electronics > Repair |
| What more i can do? |
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| 222Lab_Test222:
.. |
| 222Lab_Test222:
.. |
| Harry_22:
Ok, good, I will have a look. For future. Move the zero line lower as on my picture. Thus you can see high level signals. And don't forget about trigger. |
| Harry_22:
--- Quote from: 222Lab_Test222 on November 10, 2024, 11:37:20 pm --- --- Quote from: Harry_22 on November 09, 2024, 06:56:34 pm ---I'll bet a few bucks that due to increased leakage current (DCL) in capacitor C1 (after 30 years it is allowed), MB3771 chip does not release Reset# signal. --- End quote --- IC1 8# RESET PIN I guess it is working fine. -Connected to IC2 1st Pin -Connected to IC5 1st Pin --- End quote --- Did you use a voltage divider 10:1 here? This is the correct choice for this type of measurement, but it needs to be specified. PS Did I understand correctly that you measured the charge curve of 2.2uF C1 capacitor at pin 1 IC1? PPS No, judging by pulse rise time, this is Reset# output. |
| 222Lab_Test222:
--- Quote from: Harry_22 on November 11, 2024, 09:39:23 am --- --- Quote from: 222Lab_Test222 on November 10, 2024, 11:37:20 pm --- --- Quote from: Harry_22 on November 09, 2024, 06:56:34 pm ---I'll bet a few bucks that due to increased leakage current (DCL) in capacitor C1 (after 30 years it is allowed), MB3771 chip does not release Reset# signal. --- End quote --- IC1 8# RESET PIN I guess it is working fine. -Connected to IC2 1st Pin -Connected to IC5 1st Pin --- End quote --- Did you use a voltage divider 10:1 here? This is the correct choice for this type of measurement, but it needs to be specified. PS Did I understand correctly that you measured the charge curve of 2.2uF C1 capacitor at pin 1 IC1? PPS No, judging by pulse rise time, this is Reset# output. --- End quote --- Can you clarify a bit, lots of things i do not understand |
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