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Old 8th December 2012, 05:53 AM   #51
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Hey perry I recieved the IRFP9140PBF 2 chips today i installed them everything is running on my small 12v 1A power supply and i ran the amp both channels are working then i noticed the chips are running hot on that side of the amp IRFP9140PBF with and the SMW45N10 those 4 are all under the same rail however on the other side those are cool i tried running the amp with the rcas disconnected also and that side is still running hot but the other side is not warm at all both channel are playing music through the speakers sounds ok i just dont understand why there getting so hot any suggests for me?
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Old 8th December 2012, 07:12 AM   #52
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Measure (and post) the DC voltage across each of the 4 large resistors in the hot channel. You'll have to set the meter to the lowest range. Measure as accurately as possible. A difference of 0.002v could be significant.

Do this with no speakers and no signal source connected to the amp.

Confirm that the voltage across the resistors in the other channel is 0.000 across all of the large resistors.
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Old 8th December 2012, 07:31 AM   #53
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Hot side
1 - 29.96 Volts SMW45N10
2 - 29.91 Volts SMW45N10 also this resistor is the only one getting hot
3 - 29.47 Volts IRFP9140PBF
4 - 29.47 Volts IRFP9140PBF

Good side i didnt touch this side this side was always working
1- 29.95 Volts SMW45N10
2- 29.95 Volts SMW45N10
3- 29.50 Volts SMW20P10
4- 29.49 Volts SMW20P10
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Old 8th December 2012, 07:37 AM   #54
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Measure 'across'. That means that you will place one probe on each end of the resistor that you're measuring the voltage on.
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Old 8th December 2012, 07:39 AM   #55
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Also with the volt test 5 out of the 8 resistors had slight voltage across

Hot side
1 - 29.96 Volts SMW45N10 across= .001
2 - 29.91 Volts SMW45N10 also this resistor is the only one getting hot across= .005
3 - 29.47 Volts IRFP9140PBF across= .003
4 - 29.47 Volts IRFP9140PBF across= .003


Good side i didnt touch this side this side was always working
1- 29.95 Volts SMW45N10 across= .001
2- 29.95 Volts SMW45N10 across= .001
3- 29.50 Volts SMW20P10 across= .001
4- 29.49 Volts SMW20P10 across= .001
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Old 8th December 2012, 07:40 AM   #56
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That was on mvolts sorry do you want those readings on just VOLTS?
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Old 8th December 2012, 07:42 AM   #57
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Measure the resistance between the first legs of each of the adjacent 45N10s in both channels and post the resistance for each pair.
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Old 8th December 2012, 07:44 AM   #58
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Those were the regular volt readings not the mvolts sorry also i dont think my meter is calibrated right because the 0.01 stays on the meter when nothings hooked up
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Old 8th December 2012, 07:45 AM   #59
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measure the resistence when the amp is powered or not powered?
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Old 8th December 2012, 07:49 AM   #60
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not powered im getting 228.8 on the good side and 229.5 on the hot side
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