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Old 2nd March 2012, 05:04 PM   #11
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Location: Louisiana
That's a 20v Zener. You can confirm by looking up the markings. It needs to be replaced. When you order them,order extras.

Post the DC voltage on all 8 pins of the UC3845.

Pin 1:
Pin 2:
Pin 3:
Pin 4:
Pin 5:
Pin 6:
Pin 7:
Pin 8:
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Old 2nd March 2012, 06:06 PM   #12
m4ick is offline m4ick  United States
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Do you know the package type of that diode?

Do you want the voltages on UC3845 before or after the diode is replaced?
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Old 2nd March 2012, 06:08 PM   #13
m4ick is offline m4ick  United States
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I was just looking around in this amp and Q240 is missing, it is present in your photos.

EDIT: Nevermind, it's been modded to be 1 ohm stable. I noticed it is missing the other 1501d they gave me. No wonder its blown.
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Last edited by m4ick; 2nd March 2012 at 06:15 PM.
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Old 29th March 2012, 03:16 PM   #14
m4ick is offline m4ick  United States
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Ok, so my meter had a low battery and I was getting high voltage readings.

I read 19.2vDC across the zener.

Do you want voltages on the UC3845 referenced from battery ground?

EDIT: I'm trying to figure out why FET260 is getting hot.
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Last edited by m4ick; 29th March 2012 at 03:22 PM.
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Old 29th March 2012, 03:32 PM   #15
m4ick is offline m4ick  United States
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UC3845 referenced from battery ground:

Pin 1: 2.1v
Pin 2: 2.5v
Pin 3: 0v
Pin 4: 2.4v
Pin 5: 0v
Pin 6: 2.4v
Pin 7: 10.8v
Pin 8: 0v
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Old 29th March 2012, 04:09 PM   #16
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FET260 will get hot if it's not clamped down.

With all transistors clamped to the heatsink, does the amp produce clean audio?
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Old 29th March 2012, 07:32 PM   #17
m4ick is offline m4ick  United States
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It powers up and produces audio. I can feel FET260 getting warm but I left it idling for about an hour and it seems stable. I'll test it on some subs soon.

Thanks.
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