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Rockford Fosgate Punch 600a4
Rockford Fosgate Punch 600a4
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Old 15th September 2020, 04:29 AM   #31
objext is offline objext  United States
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Q6, Q8, & Q13 drop down to similar temps of Q5, Q7, & Q12 if I lower the supply voltage from 14V to 13V. U202 & U402 continue to be around 116-117. I think U402 may actually be the hotter of the two, but only by a degree or two.
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Old 15th September 2020, 04:51 AM   #32
objext is offline objext  United States
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Q309 and the like (the MPSA56 & MPSA06) are also getting warm/hot, as high as about 123F
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Old 15th September 2020, 09:10 AM   #33
Perry Babin is offline Perry Babin  United States
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Are you saying that the 300 series transistors including Q309 are heating, alone or are all of the Qx09 transistors heating?

Post a photo of the drive signal on the gate legs of one PS FET in each bank when the FETs are heating unevenly and when they are heating equally.

For the hottest op-amp, remove it or at least lift it's power supply terminals and re-check the heating of the adjacent op-amp to see if it's still heating up.
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Old 16th September 2020, 12:57 AM   #34
objext is offline objext  United States
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Q108, Q109
Q208, Q209
Q308, Q309
Q408, Q409

These are all heating, but maybe this is normal. Just trying to find any outliers that might indicate a problem. I don't have a scope, but I guess I need to get one if I'm going to try to figure this out without shipping it off to someone else.

I will try your suggestion of lifting the hottest op-amp. Thanks for your help, Perry
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