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Rockford 1501bd >>> Problems e service manual
Rockford 1501bd >>> Problems e service manual
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Old 9th October 2018, 11:03 PM   #21
TasoTaso is offline TasoTaso
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..or before changing the TL072 is it better to measure their power supply?
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Old 10th October 2018, 11:46 AM   #22
Perry Babin is offline Perry Babin  United States
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#20:
There are VERY few legitimate sellers of semiconductors on ebay. These MAY be OK but I'd suggest buying from a reputable distributor.

#21:
It would have taken less time to measure the voltage than the time it will generally take to get a reply.
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Old 10th October 2018, 06:32 PM   #23
TasoTaso is offline TasoTaso
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I have not measured the tension because I'm always afraid of doing damage and I do not know what values I have to find.
if it is useful, proceed to measure it.
what tensions should I have? from datasheet i don't understand if +18v or +15v (between GND and + VCC?)

Thanks again.
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Old 10th October 2018, 07:03 PM   #24
Perry Babin is offline Perry Babin  United States
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Black probe It's just like when you measured the offset, it's just different pins. I think the voltage will be about 10v. Pins 4 and 8.
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Old 11th October 2018, 02:10 PM   #25
TasoTaso is offline TasoTaso
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ok I listen to your advice I buy on a serious site with certified material (they assured me over the phone). I buy on RScomponents ...... But I see different models .. what should I take from this list?

Amplificatori operazionali | RS Components

I see that there are many different models!

Thank you
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Old 11th October 2018, 04:42 PM   #26
Perry Babin is offline Perry Babin  United States
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TL072CD Texas Instruments
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Old 12th October 2018, 01:24 AM   #27
TasoTaso is offline TasoTaso
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Hi, i have measured after 2 minutes switch on amplifier.

On U1 U2 U3 i have V- and V+ ...13.4v and 13.2v.
On U4 i have on V- 9.2v and on V+ 10.5v.

Is all normal?

Proceed to the change of 4 operational?

Thanks for assisting me! :P
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Old 12th October 2018, 10:07 AM   #28
Perry Babin is offline Perry Babin  United States
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The supply voltages are OK.

Start with replacing U2 and see if that solves the problem.
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