Peavey ipr2 7500

[saj888]

Hi again,
i am working on a IPR2 7500, When amp is turned on, On ch one the ddt and signal leds would stay on for approx 10 seconds then go off. the amp then works normal for a long while. This would only happen when the amp has been turned off for over ten minutes. Any suggestions?
Thank you.

 

[Khron]

Scope the power amp input / output?

 

[saj888]

Peavey IPR2 7500

Yes. Waveforms look normal. When the ddt led comes on the signal drops. The ics read the same as the good ch. i am thinking about replacing all lm393 and lm358 ics on that ch.