Pioneer SX-750 Channels on oscilloscope
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@jpdylon Hi, amplifier was working and now there's no problem. What can be the next step? overcurrent or overload? DC detection?
Atilanos 7 months ago
let me know if scraping the leads helps the problem. The saline deposits really only cause the effect when operating voltage is applied. The leakage testers really do not apply enough current. If you really want to measure leakage effectively, an old VOM is necessary. Something that uses a large battery like a 20 volt cell. On the x100k scale often times 20 or more volts is used. I will measure between C-E to discover leakage. Don't attempt it between B-C or B-E. You will saturate the junctions.
jpdylon 7 months ago
@jpdylon I've cleaned the differential amplifier and it looks that it works good. I'll test it more time. Now I have to check the other problem shown in the second part of my other video.
Atilanos 7 months ago
@jpdylon Hi, I've checked the differential amplifier and my analyzer does not find leakage current. Also does not find on the 2SC1438. Is there any way to check leakage manually? Also I've checked that there's a difference on Hfe, 381 and 249 respectively.
Now I'm going to scrape between the leads.
Thank you!
Atilanos 7 months ago
That is definitely transistor noise. I suspect that you may have conductive deposits on the bottom of one or more transistors.Where i live we call that "Beach disease" because it is common of machines that were near the ocean. I would removed the differential amplifier transistor pack (looks like two transistors in one) and scrape between the leads with a sharp razor knife. Check the other small transistors as well. While you've got them out you can also check them for leakage.
jpdylon 7 months ago