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Old 23rd January 2008, 02:56 PM   #1
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Default xtant 604 x

Im working on a xtant 604x the left front channel is not working in it i replaced 4 irf9z34's in it which were bad also all transistors the bf 422 and 423's whith a better part mpsa42 and mpsa92 also replaced all diodes which read y8 and h5 some were bad so replaced them all also replaced some surface mount resistors the 47 ohm 10 ohm 100 ohm and 1000 ohm all other channels work fine besides for the left replaced all the parts and as soon as i try and power it up it burns up the 10 ohm resistors in about a sec amp trys to draw about 40 amps of current wondering if anyone else knows what may be causing this any help would be greatly appericared
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Old 23rd January 2008, 06:57 PM   #2
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Have you tried turning the bias down?

What is the 10 ohm resistor connected to?
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Old 18th November 2008, 09:05 AM   #3
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Default xtant x604

Hi, I am repairing this amp as well of my own. I have replaced the irfz's also but cannot figure out what these circuits that are laid out all over the board. A few are blown. they are located at r904, r917, and r919. they are all for the left rear channel. they have either 100 or 103 marked and the tops of them. thanks, I'm kind of new at this but have been about 95% succesfull with other repairs.
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Old 18th November 2008, 09:25 AM   #4
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The MPSA and the BF transistors have different pin configurations. Did you reverse legs 2 and 3 when you installed the MPSA transistors?
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Old 18th November 2008, 03:48 PM   #5
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The markings u are talking about are surface mount resistors. The 100 markings are 10 ohm resistors and the 103 markings are 10k ohms. They are really cheap to by like maybe 5 cents a piece from digikey or the supplier of choice. also if u have any questions on what goes in the board locations u can call xtant they are very helpful the nuber is 1800 44 xtant
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Old 18th November 2008, 06:09 PM   #6
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thanks you very much thats the exact info i needed.
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Old 22nd November 2008, 12:35 AM   #7
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sorry the number is 1-888-44-xtant
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Old 22nd November 2008, 12:35 AM   #8
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sorry the number is 1-888-44-xtant
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Old 29th November 2008, 08:00 AM   #9
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thanks, I got the parts and the amp is working great!
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