Driver board ICs

[RJohns777]

This is an output driver board in an Autotek M4000.1D. I searched the forum and could not find anything on this amp. It is also used in Hifonics amps. I can't remember which models. Does anyone know the part number of the ICs? I believe the bottom one, U3, might be bad. Q6 was open. The amp is in protect. No shorted outputs.

Thanks

 

[Perry Babin]

They are both TL072s. U4 commonly fails. It runs hot normally. Replace both Q56 and Q7.

 

[RJohns777]

Thanks Perry!

 

[Perry Babin]

Sorry, not Q56. Q6 and Q7.