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Old 25th November 2012, 05:41 PM   #21
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Both 81.7v
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Old 25th November 2012, 05:43 PM   #22
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Where are the drivers located for the output transistors?
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Old 25th November 2012, 05:49 PM   #23
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re-read post 16.
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Old 25th November 2012, 05:52 PM   #24
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Ok I know where the through hole transistor are for the output but I don't see a 8 pin smd driver ?
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Old 25th November 2012, 06:01 PM   #25
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U500.
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Old 25th November 2012, 06:18 PM   #26
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Ok thanks found it can I check that 8 pin somehow with a dmm? Also I found a smd resistor right in that same area r669 there are two smd resistors there and one reads 10 ohms and the other one reads 84 ohms
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Old 25th November 2012, 06:27 PM   #27
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There are about 15-20 resistors in that area that need to be checked. Their resistance should match the marked value.

To test u500 with a multimeter, place the black probe on the amp's ground terminal. Place the red probe on pins 2, 4, 5 and 7. All should read about the same and about 5v, if I'm not mistaken. You will want to check all pins before the main supply powers up. To do this, you must apply remote voltage for about 1-2 seconds then remove it. The driver supply will operate for about 5-10 seconds after remote has been removed. You must measure the voltage on those pins in that 5-10 second window.
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