Hifonics Brutus 1500 hip 4080 issue - diyAudio
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Old 9th June 2014, 01:54 PM   #1
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Location: ohio
Default Hifonics Brutus 1500 hip 4080 issue

Having an issue with this thing.Unit powers up normally and relay closes.Draws about 1 amp and replaced the hip4080.Has no drive signal to output fets with 100hz drive signal.Rail voltage and +/- 15 is there as well.Have triangle wave on pin 6 and square wave on pin 7.Pin 5 only has 2.5 + vdc.Seems the 4080 isn't producing output and I dont know why.There's also a pic of the 4080 area where a 10R resistor is burnt and the film cap with red marks on it exploded and had to be replaced.
4080 pin voltages +vdc with ground as reference
1.13.1
2.13.5
3..054
4..063
5.2.5
6.6.7
7.7.0
8.5.2
9.5.2
10.13.1
11..067
12..067
13.13.5
14..063
15.13.4
16. 0? (Perhaps I wrote it down wrong,not sure if its important now)
17..051
18.13.5
19..073
20..066
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Old 9th June 2014, 02:03 PM   #2
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Which LEDs are lit?

Solder a bridge between legs 1 and 2 on IC4C. What does that change on pins 5, 6 and 7?

Pins 15 and 16 are directly connected and both should have approximately 12v.
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Old 9th June 2014, 02:08 PM   #3
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The green led lights up.No protection and relay clicks.This evening I'll bridge what you recommended.That film capacitor that's marked in the picture with the burnt resistor is for the output side of the 4080 correct?If so,any idea what caused it? I'm assuming just a bad 4080 because the original 4080 made the amp draw excessive current.There's no shorted output either.
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Old 9th June 2014, 02:13 PM   #4
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The resistor and capacitor are in series and are connected to the output filter inductor.

If the capacitor shorted, that would have caused the resistor to overheat.
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Old 9th June 2014, 10:07 PM   #5
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Bridging pins 1 and 2 of ic4c didn't make any changes.Any other ideas?
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Old 9th June 2014, 11:28 PM   #6
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Do you still have a square wave out of pin 1 of IC4C?
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Old 9th June 2014, 11:40 PM   #7
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I apologize.I only scoped pin 5 and checked voltages on 6,7. No,no square wave on pin 7(which is lm833 output I believe).To confirm,output on ic4c is straight DC voltage.
Pin5-2.6 vdc +
Pin6-6.7 vdc +
Pin7-6.9vdc+
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Old 9th June 2014, 11:42 PM   #8
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Are all of the components in the board?
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Old 9th June 2014, 11:58 PM   #9
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Yes,and the 4080 is new and the only other failed parts were 2 film caps which were replaced.
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Old 10th June 2014, 12:23 AM   #10
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Does IC4C produce audio on pin 1?

If so, do you see modulation of the square wave on pin 5 of the 4080?
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