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dual 701 fuse blowing/ other issues

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dual 701 fuse blowing/ other issues

Postby plexi » 30 Sep 2017 00:35

this table worked but has issues. I am new to this table and am currently learning/searching but if anyone can speed up my learning curve I would appreciate.....

The caps look original and I suspect the big 470uf/40v should at least get swapped out, but

1) is this the cause of blown fuse or is there other issues I wonder? the fuse holder looks blackened? Fuse blows after about a minute and a smell followed.....the smell is either the ,047uf cap over by the transformer or the transformer itself (hope not)

note the black color on that .047 cap. I assume this is not normal and is the bad cap?
Image

2)Also while the speed fine tuning knob works it is not steady. I assume this is another cap issue?

3) the strobe is not lit. I assume this is a simple lamp issue?

4)besides those two issues I can see a need to get at the underneath of the main board and there must be a trick to unseat the board so it can be turned over to access bottom solder joints?

thanks in advance

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Re: dual 701 fuse blowing/ other issues

Postby dualcan » 30 Sep 2017 03:42

Hi,
I posted many answers adressing the 701 capacitor related issues. Your Rifa X2 is ready to blow up!
Have a look at the various treads around these issues found here:
search.php?keywords=701+capacitors&terms=all&author=dualcan&fid%5B%5D=37&sc=1&sf=all&sr=posts&sk=t&sd=d&st=0&ch=300&t=0&submit=Search
Regards,
k
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Re: dual 701 fuse blowing/ other issues

Postby plexi » 30 Sep 2017 18:57

thanks, I've read all those pages now and looked at service manual. I will replace the C3 470uf/40v (largest cap) and the rifa .047uf/250v x2 flame rated cap....Also the fuse was 500mA and should be half that.

Regarding the strobe. still cannot locate the LED lamp
Image
Image


or one of these caps should get replaced? which I have not been able to locate yet?

C51- 0,068µF / 275V~ X2 for the strobe
C52- 0,047µF / 275V~ X2 strobe

or this cap in 'the switchbox- .01/100 250v
(what is a .01/100 ?)

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Re: dual 701 fuse blowing/ other issues

Postby plexi » 30 Sep 2017 19:58

Regarding the strobe. some seem to say there is an LED bulb and others a neon tube. mine seems to have a tube which is integral into the housing cover, so one would need to source that entire part to get a working strobe it appears?

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Re: dual 701 fuse blowing/ other issues

Postby Tinkaroo » 30 Sep 2017 20:06

I've read that sometimes reversing the strobe bulb will work, but Dualfred has replacements if needed.
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Re: dual 701 fuse blowing/ other issues

Postby plexi » 30 Sep 2017 20:33

thanks, I now am inside the housing and removed the bulb. will try reversing.......to replace though, am still trying to find out it's value . teh thread below seems to indicate it is no longer available? and suggests an led/resistor alternative

viewtopic.php?t=64681
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Re: dual 701 fuse blowing/ other issues

Postby Tinkaroo » 30 Sep 2017 20:43

I don't know the value but here is the Dualfred replacement.

http://www.dualfred.de/advanced_search_ ... bfnl6qop32
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Re: dual 701 fuse blowing/ other issues

Postby plexi » 30 Sep 2017 21:08

when I click that link, no item shows up. The site is in german as well which is problematic. Will continue to try and find it on their site though, maybe try and translate to english etc....thanks though and I will try the cleaning and reversing trick first though

also, the X2 flame rated cap seems difficult to locate on Mouser's site. must be a rare part. Local electronics stores never even heard of such a capacitor

this is closest i've found. and is expensive
http://www.ebay.com/itm/4-RIFA-Metalize ... SwiDFYO6VR



just in case others need info in the future, researching on the X2 cap:

Rifa is now the company KMET


https://electronics.stackexchange.com/q ... -capacitor





Even if one of these is correct, none are available/in stock.....


http://www.mouser.com/KEMET/PME271M-Ser ... yword=.047
Last edited by plexi on 30 Sep 2017 21:33, edited 4 times in total.
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Re: dual 701 fuse blowing/ other issues

Postby Tinkaroo » 30 Sep 2017 21:16

If you click on the small Union Jack flag in the top left corner the English site will come up.
Then you type "strobe"'in the search engine.
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Re: dual 701 fuse blowing/ other issues

Postby plexi » 30 Sep 2017 21:29

Tinkaroo wrote:If you click on the small Union Jack flag in the top left corner the English site will come up.
Then you type "strobe"'in the search engine.



great, thanks

http://www.dualfred.de/Drive/Electronic ... or-en.html
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Re: dual 701 fuse blowing/ other issues

Postby Spinner45 » 30 Sep 2017 21:35

A common 0.047uf poly cap rated at 630 volts is all that is required.
No need for a "special" cap in that application.
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Re: dual 701 fuse blowing/ other issues

Postby Tinkaroo » 30 Sep 2017 21:41

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Re: dual 701 fuse blowing/ other issues

Postby plexi » 30 Sep 2017 21:50

Garard 401 stanton881s rega rb303, Thorens125/Acos Lustre grado G, AR XA rega 200 ShureV15III MR, Lenco l70 rega rb202 Stanton881s, LCR loungeMM preamp
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Re: dual 701 fuse blowing/ other issues

Postby gofar99 » 30 Sep 2017 22:32

Hi, X2 capacitors are rated for use in AC circuits that connect to the mains. Most countries require them as part of their electrical codes. They are self healing. Ones made by Vishay are commonly available from the parts houses and not expensive.
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Re: dual 701 fuse blowing/ other issues

Postby plexi » 01 Oct 2017 00:49

thanks for the info. When I search mouser and limit to polypropylene and 250v .047uf. this is what I have to choose from. None have any specific x2 rating however?

http://www.mouser.com/Vishay/Passive-Co ... t1Z1yzshdi

to search mouser or digi key. I first search under film and then limit to poly ? I see no category that limits search to MKP (metallized polypropylene
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