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Old 17th December 2009, 02:15 PM   #21
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Thanks Perry for all your help. I have both amps up and running working 100% flawless. Thanks again
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Old 2nd February 2010, 01:52 AM   #22
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I have one more of these amp that came in today. 1 of the drivers for the outputs is shorted its marked 2t. Wondering if i can sub this driver for something else? Cause if i order the orignal im gonna phone calls everyday til the amp is fixed and dont really wanna deal with it just wanna get it done and out the door
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Old 2nd February 2010, 07:38 AM   #23
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The MMBTA56 is close but can't handle quite as much current.

You need to tell people that you'll call them when it's repaired or give them a date to call. If you have to order parts to do the job right, no reasonable person will get upset. If they are unreasonable, tell them that they'll have to send it to the manufacturer for repair. The problem is theirs, don't let them make it your problem.
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Old 10th February 2010, 02:21 PM   #24
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On this 3rd amp i replaced all the outputs and 2 out of the 4 drivers in it, also replaced the emitter resistors.

The amp still idles around 10 amps of current and has dc on the outputs.

wondering what to check now?
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Old 10th February 2010, 02:39 PM   #25
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How much DC?

Does the DC drop significantly when you connect a dummy load to it?
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Old 20th February 2010, 06:20 PM   #26
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On this 3rd amp.

Ive replaced all the outputs, emmitter resistors. the rail caps, the drivers for the outputs, and a few other 100 and 10k ohm resistors.

WHen i try powering it up it goes into protection. If i pull the rectifiers it powers up fine. SO i tested all the rectifiers all test fine. Put them back in the amp goes into protection.

Wondering what i should check next since this amp is really starting to make me mad
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Old 20th February 2010, 07:23 PM   #27
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I have one that will be here Monday. It has protection circuit problems. Let me troubleshoot that one and then I'll be a bit more helpful.

Does the amp produce any DC across the speaker terminals as it tries to power up?
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Old 7th April 2010, 09:16 AM   #28
amc32 is offline amc32  United States
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try to determine the zener diode that they soldier across the output fets isn't leaky. As for the power supply fets the p60n06 is the original, z44 or z48 won't handle the current but will work. You may have to change the surface mount gate resistors from 47 ohm to 100 ohm though.
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