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Old 19th May 2017, 03:54 PM   #1
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Default Cadence CPA245

Someone gave me this amp a while ago and Iam trying to learn more and fix it so it was missing a fuse and I put a fuse back into it and tried to power it off my power supply and the light on the supply shuts off when its connected. So I believe that there is a short. Any help would be appreciated!
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Old 19th May 2017, 04:23 PM   #2
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If the excessive current draw is only after remote voltage is applied, the output transistors are the most likely culprit.
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Old 19th May 2017, 04:59 PM   #3
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I just checked it happens as soon as I connect the battery terminal
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Old 19th May 2017, 05:01 PM   #4
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That would likely be either shorted power supply FETs or a shorted reverse protection diode. If the FETs don't read near 0 ohms from leg 1-2, it's likely the reverse protection diode.
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Old 19th May 2017, 05:08 PM   #5
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So the oiwer supply FETs would be the 2 IRFZ44 at the top right? And leds 1 and 2 would be the gate and drain?
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Old 19th May 2017, 06:54 PM   #6
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yes and yes
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Old 19th May 2017, 06:58 PM   #7
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The top FET has 7.5ohms the other has 191ohms
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Old 19th May 2017, 07:09 PM   #8
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Pull them and check them out of the circuit. They're likely defective.
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Old 19th May 2017, 07:43 PM   #9
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One has 8ohms between 1 and 2 and the other is showing it is open.
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Old 19th May 2017, 07:50 PM   #10
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The open one may be OK but you should replace both. After cleaning the pads so there is no solder bridge, does it draw excessive current when powered up?
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