| Kustom PX-200 [message #4176] |
Tue, 11 May 2004 19:07  |
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The main amp will not work, when i plug speakers into it, it just hums. the monitor amp will work but when using it the back gets really hot (too hot). my friend seems to think its a transistor, is this a correct assumption? and if so how would i go about replacing it? anyone have any schematics on this model?
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| Re: Kustom PX-200 [message #15470 is a reply to message #4176] |
Tue, 29 March 2011 21:04  |
cassent5150
Messages: 341
Registered: August 2009
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Senior Member |
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I have that mixing board also and there is no issues with it. I would first suggest the heat problem may have to do with too low impedence. Mine gets hot also when I get the ohms around 4 ohms so I try to keep a 8 ohm cab or 2 16 ohm monitors on it and it does fine. It does a good job for small clubs. I haven't had it opened so I dont know what driver boards are in it for sure but I would guess it to be like the PC-5021 100 watt board like they used in the speaker power modules. I didn't find it to be difficult to overhaul. The one I worked on was doing the same thing as your main board, loud humm. If you have a little knowledge in electronics it could be possible to walk you through it. You'll need to have a multi meter (preferably Digital)and be able to understand how to use it. You'll also need a desoldering tool and soldering iron with a good tip and be able to use it without burning up the board or bridging the solder lines (Traces) together. The rest is information , replacement parts and a whole lot of time. This isnt something you can rush thru. As old as it is, caps would also be questioned. Steve C
PS: If this is something you plan on putting to work full time for a band, it would be best to have a good tech go through it.
Steve C
[Updated on: Tue, 29 March 2011 21:11] Report message to a moderator |
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| Re: Kustom PX-200 [message #15473 is a reply to message #15471] |
Wed, 30 March 2011 15:46 |
cassent5150
Messages: 341
Registered: August 2009
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Senior Member |
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I gave $100 for mine a year or two ago. There not a real collectable piece, but are very user friendly. I pulled the power module out of the back of my PX200 board and its not at all like the earlier modules I was talking about. Still using the same basic idea just newer components. I would guess a driver transistor (The small square ones mounted in the alluminum heat sinks on each end of the board) is going to be bad if theres nothing burnt looking on the board. If you have a volt meter, check to see if there is DC voltage in the speaker output jack. The main output transistors are not soldered in and can be replaced easily with the removal of the 2 mounting screws, but keep in mind these are insulated from the chassis with a plastic insulator and plastic shoulder washers. They will just pull out of the sockets by hand and can somewhat be tested by using a continuity tester (Multimeter). If you find any bad they can be replaced with the common 2N3055 NPN power transistor
Steve C
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