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Old 14th July 2010, 01:58 AM   #11
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Ok i took the D1302 out of the board and heres what i measured Meter set to ohms.

legs 1-2:0.685

legs1-3:0.685

leg2-3:36.88

Probes reversed

1-2:19.75

1-3:0.684

2-3:0.685

Does this appear to be defective??
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Old 14th July 2010, 03:43 AM   #12
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It does appear to be defective but some muting transistors can produce strange readings. When I get back into the shop, I'll see if I have a new one to see if it reads like a normal transistor.

Does the amp produce audio with the transistor out of the circuit (3 outputs removed as before)?
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Old 14th July 2010, 04:29 AM   #13
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I just got done putting a new inductor in the amp. Im soldering all of the outputs back in and also the driver board. I have to check a few more things before i power it up.

I pulled another D1302 from another amp and on this one the readings are

OL In all posistions even with probes reversed
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Old 15th July 2010, 03:44 AM   #14
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Perry,

I checked through the amp and now im ready to power it up but theres 1 problem.

I didnt notice it til now but the sil pad is missing from the amp.

Wondering if i can power it up out of the sink if i put a 1ohm 25 watt current limiter on it just to see if i have any problems?
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Old 15th July 2010, 06:02 AM   #15
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Ok nevermind the last post.


I powerd it up and it didnt blow the outputs but the amp idles to high around 10 amps.

It blew a cap in the power supply section so i replaced the cap .

Wondering how do i tell if i have a power supply issue or if the problem is in the output section since the amp is idling at 10 amps
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Old 15th July 2010, 07:39 AM   #16
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After it's powered up for a few seconds and then switched off, which transistors begin to heat up?

It's safer to touch the plastic part of the transistor. The metal tabs could be very hot and in this amp could have significant voltage on them.
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Old 15th July 2010, 02:28 PM   #17
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Ill check again but i powerd it up for a few secs at a time and no transistors were getting hot or even warm
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Old 15th July 2010, 02:37 PM   #18
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I have benched a few amps that idled around 12 amps and were reliable so I can't say it's abnormal for large amps but I would expect it to be less.

Are the replacement parts the exact replacement parts?
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Old 15th July 2010, 02:43 PM   #19
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Yes i replaced the outputs with the excat part number
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Old 16th July 2010, 07:37 PM   #20
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Im still working on this amp. It has some power supplu problems with it.

There a 3K resistor in the power supply section and its reading 2396 ohms on the multimeter does it apper to be good or out of tolerance?
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