Ok replaced the TC74AC14F (IC303) and the NJM311M (IC302) in front of it. The new logic IC gets hot also.
This amp had extensive damage to all of the voltage regulators so it didn't seem out of line that this IC could be defective.
I have clean audio signal up to the input of the NJM311M I replaced so the only other IC I suspect damaged is the TND505MD drive IC.
I have the service manual if you want / need a copy.
This amp had extensive damage to all of the voltage regulators so it didn't seem out of line that this IC could be defective.
I have clean audio signal up to the input of the NJM311M I replaced so the only other IC I suspect damaged is the TND505MD drive IC.
I have the service manual if you want / need a copy.
If the logic IC that you're referring to is IC303, it's possible that whatever it's driving is defective.
Send me a copy of the manual if you need more help with it.
babin_perry@yahoo.com
Send me a copy of the manual if you need more help with it.
babin_perry@yahoo.com
Not sure how reliable the ACV readings are. I checked each several times and each time the ACV and Frequency were slightly different but here is what I get:
R319: 000.0mVDC ~81.5mVAC ~60KHz
R320: 000.0mVDC ~82.0mVAC ~60KHz
R321: 000.0mVDC ~25.8mVAC ~52KHz
R322: 000.0mVDC ~28.0mVAC ~52KHz
R319: 000.0mVDC ~81.5mVAC ~60KHz
R320: 000.0mVDC ~82.0mVAC ~60KHz
R321: 000.0mVDC ~25.8mVAC ~52KHz
R322: 000.0mVDC ~28.0mVAC ~52KHz
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