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Help me fix MTX 152 and MTX 500D
Help me fix MTX 152 and MTX 500D
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Old 23rd October 2008, 03:11 AM   #31
Perry Babin is offline Perry Babin  United States
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For short term testing, yes but the 640s are rated for significantly less current so they're not a suitable permanent replacement.
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Old 23rd October 2008, 03:13 AM   #32
hakentt is offline hakentt  United States
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what would be good replacement for IRF540? a IRF3205?
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Old 23rd October 2008, 03:14 AM   #33
Perry Babin is offline Perry Babin  United States
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If the OEM part was an IRF540, that's the correct part.
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Old 23rd October 2008, 05:14 AM   #34
hakentt is offline hakentt  United States
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I got it put together the best I can and it powerd up and I can hear the speakers but barely, with gain all the way up as well as the gain on the player all the way up I can barely get it to produce sound. I guess I did not put the correct resistors where they should be. I will have to wait until I get one good 152 then see what resistors they are. Or I can use this for parts.
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Old 23rd October 2008, 11:48 AM   #35
Perry Babin is offline Perry Babin  United States
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Do you have positive and negative 18v on the power supply pins of the op-amps?

Do you have positive and negative rail voltage on the output transistors?

Why couldn't you get the value of the burned components from the other channel?
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Old 23rd October 2008, 09:57 PM   #36
hakentt is offline hakentt  United States
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because the burned resistors burned the labeling on the board so I don't know which ones they are. So the best thing I can do is to wait until I find another 152 or if someone can post hi-def photo of the good board. I replaced the op amps, socketed the board so thats no problem. Am glad that I fixed the other amps.
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Old 23rd October 2008, 10:05 PM   #37
Perry Babin is offline Perry Babin  United States
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Use the surrounding parts as a guide. They may be grouped the same in both channels.

If you simply don't want to repair this one, let me know. I realize that it may not be worth the effort.
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Old 24th October 2008, 05:48 AM   #38
hakentt is offline hakentt  United States
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I want to fix it but wuthout proper information I hate to guess what goes there, so until I get proper picture of this amp I might be able to fix it. other chanell is not grouped the same, resistors are totaly at different positions and not grouped the same. So I will wait until I get proper information on the amp and go from there.
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Old 13th November 2008, 07:59 PM   #39
hakentt is offline hakentt  United States
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Perry, I found another MTX 152 that works now I can see what components are there to fix my other MTX 152. However this amps has problems too, it works fine at low gain, soon as you turn the volume up or gain on the amp up, the output distorts badly, it sends nasty noise to speakers. What could it be? op-amps.? On the board I can't see anything that is overheated, it looks ok.
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Old 13th November 2008, 08:40 PM   #40
Perry Babin is offline Perry Babin  United States
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What are you using for a signal source?
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