Lab Gruppen FP14000 clone amplifiers - Page 161 - AVS Forum
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post #4801 of 4808 Old 12-16-2014, 10:05 PM
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So I got my fp10kq yesterday and as you can probably guess, the fans need to go... So for the 60 mm fans are the resisters only used to quiet the fans more than they already are ? I have my 80 mm fans and was going to order my 60's but wanted to check about the resisters.
Thanks in advance,
Ivor
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post #4802 of 4808 Old 12-16-2014, 10:09 PM - Thread Starter
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Quote:
Originally Posted by Fattykidd View Post
So I got my fp10kq yesterday and as you can probably guess, the fans need to go... So for the 60 mm fans are the resisters only used to quiet the fans more than they already are ? I have my 80 mm fans and was going to order my 60's but wanted to check about the resisters.
Thanks in advance,
Ivor
Resistors are needed to drop the noise level further.
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post #4803 of 4808 Old 12-16-2014, 10:11 PM
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Quote:
Originally Posted by notnyt View Post
Resistors are needed to drop the noise level further.
So they are optional?
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post #4804 of 4808 Old 12-16-2014, 10:12 PM - Thread Starter
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Originally Posted by Fattykidd View Post
So they are optional?
Not if you want it quiet
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post #4805 of 4808 Old 12-16-2014, 10:17 PM
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Originally Posted by notnyt View Post
Not if you want it quiet
So it just goes inline on positive ? Side going to the 60mm fans ?
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post #4806 of 4808 Old 12-16-2014, 10:20 PM - Thread Starter
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post #4807 of 4808 Old 12-16-2014, 10:31 PM
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Thanks...
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post #4808 of 4808 Old Yesterday, 07:26 PM
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Anything less than a fully automated system for testing this amps is not very advisable. If I ever get one of these I could do a automated unloaded test with pretty graphs on a AP system. I still lack a proper reactive load for load testing such as the AudioGraph Power Cube. You guys are getting me worried about setting up your own testing scheme. Please be careful.
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post #4809 of 4808 Old Yesterday, 08:08 PM
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Does anyone have a service manual for the FP+10000Q?
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post #4810 of 4808 Old Today, 02:51 AM
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Quote:
Originally Posted by cellarnoise View Post
I bought a dead FP14000 that was power cycling. After about 50 hours of playing with it and having a friend with a scope check it out the following post solved this particular problem for my amp. Has been working well for several months.

buy one of these:
http://ca.mouser.com/ProductDetail/P...WrX8IHli/VDQ==

check out post #3488 or #3492 and #3908 . I went with a single turn trimmer as it fit the spot correctly. There is not much room around the CAPs to fit a multi-turn variable resistor. The solder joints on these amps is not always the best....

I dialed the single turn variable resistor to 2500 ohm total resistance. Worked great after that. Also check the other resistors in the general area for proper soldering to the board.

Good luck.

Attached is a graphic showing the variable resistor installation location:
Great thanks so much for the info!

I have emailed Johnson and he has replied with the following:

"please add one 510 ohms or 1K ohms series resistor as attached picture, till the output voltage is approx 150V DC, then solve this problem"

With the same picture that you included in your post. However in the blue circle is says to place either 1k resistor or 510, which was confusing to me. So I asked for further clarification as to which type of resistor I should use and he replied with the following:

"You could purchase ten pieces 510 ohms series resistor and ten pieces 1 K ohms series resistors together, which is very cheap. Then try to add as attached, and till the output voltage is approx 150V."

Which confuses me even further =/

Does he mean to continue adding them across the solder points in the blue circle? Or to add them along the points marked in red?

If it is just to add them across the blue circle then I will use a single turn trimmer as you have described if that is the case.

Also did you test the output voltage was approx 150V after you installed the resistor set to 2.5k? Or did it just work so you left it alone?

Thanks again =)
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