Trying to repair MMats 3500.1 - diyAudio
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Old 16th January 2010, 08:56 PM   #1
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Default Trying to repair MMats 3500.1

Click the image to open in full size.

In the pic i have arrow pointing to one fet and diode. That diode is bad after testing all 6 diodes. The 1 fet is the only 1 shows 0.18 ohm (between G and S) dmm set to 20m ohm. The other fb4710 fets show 0 mega ohm between legs G and S.
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Old 16th January 2010, 10:21 PM   #2
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Was there a question?
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Old 16th January 2010, 10:33 PM   #3
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yes your right. Did i properly test the output fets? are they dead?
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Old 17th January 2010, 01:05 AM   #4
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If you read ~0 ohms between the legs of any of the outputs, it's likely that at least one has failed and all of them (the IRFB4710s) will have to be replaced. You need to remove them to test them definitively. Replace the IC also. If the diode has failed, of course, you'll have to replace that.

If you're unsure of how to test the FETs, go to the following page and read the sections in the orange rectangles in this image (<- click).

Basic Amplifier Repair - Transistor Test Applet Link
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Old 17th January 2010, 01:59 AM   #5
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Thanks for your help. Ic is it the one in the middle behind the blue caps? there are total of 4 chips do you know what their purpose is? What do you think about this amp, is it capable of 2700 rms, that is what it is rated.
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Old 17th January 2010, 10:13 PM   #6
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do you repair amps?
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Old 17th January 2010, 10:56 PM   #7
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just wanted to know how much it would cost to repair it.
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Old 18th January 2010, 12:34 AM   #8
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I was referring to the HIP4080 driver IC. This IC drives the output transistors.

The IC near the power supply power transformers produces the signal to drive the power supply FETs.

The LM2901 is part of the protection circuit.

The two 8 pin ICs are a buffer between the power supply driver IC and the power supply FETs.

The three 14 pin ICs near the potentiometers process the preamp level audio signal.

I repair amps but I really don't like these amps and don't want to repair it. Everyone tries to drive them into extremely low ohm loads (below what they can handle reliably) which causes them to fail. Also, in my opinion, the FETs they are driving are too much of a load for the driver IC.
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Old 18th January 2010, 02:54 AM   #9
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Thanks a allot . Thats allot great information. What is the reason you hate them if i can ask ?
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Old 18th January 2010, 06:08 PM   #10
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mmats d50hc still works in my car , after 1 1/2 years of abuse, wired to its normal ohm load. i always thought that the older mmats amps are more reliable then the new models.

Are there unregulated power supply amps that produce over 2k rms, that are reliable, that you can recommend.
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