Mmats DHC1400.02 needs repairing.

Dr Zeus · 14th December 2010, 09:32 PM

I just picked up this amp and it has a few problems...

I think one of the transformer coils may be shorted. Is this amp worth repairing? The output transistors measrure up OK on the DVM... I wonder if someone hooked this amp up backwards and then tried to twist/repair the power transistor diodes.

Several resistors are also toasted. I'll have to go through this amp more thouroughly... If repairing it is worth is and a possibility.

Perry Babin · 14th December 2010, 10:12 PM

Unless you can get another transformer from MMATS, it's not worth repairing (in my opinion).

Dr Zeus · 15th December 2010, 01:15 PM

I just heard back from MMATS. The parts are not available but repair service is. The transformers have numbers "3:14" on them; if anyone has this part please let me know.

Perry Babin · 15th December 2010, 01:45 PM

That may be the ratio (primary to secondary).

14th December 2010, 09:32 PM	#1
Dr Zeus diyAudio Member Join Date: Oct 2010	Mmats DHC1400.02 needs repairing. I just picked up this amp and it has a few problems... I think one of the transformer coils may be shorted. Is this amp worth repairing? The output transistors measrure up OK on the DVM... I wonder if someone hooked this amp up backwards and then tried to twist/repair the power transistor diodes. Several resistors are also toasted. I'll have to go through this amp more thouroughly... If repairing it is worth is and a possibility.

14th December 2010, 10:12 PM	#2
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	Unless you can get another transformer from MMATS, it's not worth repairing (in my opinion). __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

15th December 2010, 01:45 PM	#4
Perry Babin diyAudio Member Join Date: Nov 2003 Location: Louisiana	That may be the ratio (primary to secondary). __________________ Links >> Basic Car Audio Amp Repair --- Basic Car Audio Electronics --- Basic Transistor Testing --- Basic Switching Power Supply Design --- Basic Computer Skills << Links

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15th December 2010, 01:15 PM	#3
Dr Zeus diyAudio Member Join Date: Oct 2010	I just heard back from MMATS. The parts are not available but repair service is. The transformers have numbers "3:14" on them; if anyone has this part please let me know.

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