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**R_J** · 03-12-2022, 05:46 PM

As usual I would check or better yet replace C32, vcc for U2 and C13 or at least check the vcc voltage of U2 to be sure its not going into burst mode due to low vcc

Check if your +41v at CN100 is there all the time, also if the +15 disappears, the whole secondary circuit will likely not operate so Q15 would likely turn off.

03-12-2022, 05:46 PM	#2
R_J Badcaps Veteran Join Date: Jun 2012 City & State: ☻ My Country: Canada I'm a: Professional Tech Posts: 8,152	Re: Panasonic PBX shuts off at random As usual I would check or better yet replace C32, vcc for U2 and C13 or at least check the vcc voltage of U2 to be sure its not going into burst mode due to low vcc Check if your +41v at CN100 is there all the time, also if the +15 disappears, the whole secondary circuit will likely not operate so Q15 would likely turn off. Last edited by R_J; 03-12-2022 at 06:01 PM..