I have Sansui amplifier AU9500,, no sound, I found fuse 2 amperes, 7 amperes burns, I found too 3.3 uf 100 volts completly bulging under driver board, 1 transistor output 2SA679 shorted,and I found too the 4 capacitors 4700UF 63 volts they have not good value, I changed all these components and one of 2 capacitors 3.3 uf 100 volts is going very hot after 30 seconds, do I have power supply problem?
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Re: Sansui AU9500, capacitor blows
A 7 ampere fuse burns out, too, when rated for only 2 amperes? Sounds like a bad transistor to me! (besides the bad caps, of course!)ASRock B550 PG Velocita
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Re: Sansui AU9500, capacitor blows
Yes, I change too 2 transistors audio output on the left channel, and same problem the 3.3 uf 100 volts under the driver board become very hot and blowing upComment
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Re: Sansui AU9500, capacitor blows
you put the cap in backwards or the power supply needs workComment
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Re: Sansui AU9500, capacitor blows
The capacitor was completly bulging before I work on the amplifier, I put the cap with good polarity and I put a 160 volts capacitor( original was 100 volts), I think problem is in the Power SupplyComment
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Re: Sansui AU9500, capacitor blows
did this amp ever work for you ? a little will be a big help ..
the only caps i see with 33 is 33pf .Comment
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Re: Sansui AU9500, capacitor blows
What are the LOCATION NUMBERS of the componemts that you changed ? Which capacitor is getting hot? C???? For a capacitor to get hot it is either in backwards or has way too much voltage across it.Comment
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Re: Sansui AU9500, capacitor blows
hold on a bit .. no way too much voltage got the 100v cap hot . 3.3uf isnt a value in that amp as far as i can see .. if you cant work out board designator id tell us what it connects to . and if there are holes in the board for it . it is possibly a late addition from factory .
some nice pictures will help .Last edited by petehall347; 07-30-2021, 06:53 PM.Comment
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Re: Sansui AU9500, capacitor blows
Either something is drawing power like a SOB, or that cap is backwards or wrong value or high ESR.Comment
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Re: Sansui AU9500, capacitor blows
Check on this photo the 2 new capacitors I put, one is blue and the other is black, I check on schematic and is not listedAttached FilesComment
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Re: Sansui AU9500, capacitor blows
trace where the wires go to what the caps connect to .and tell us ..Comment
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Re: Sansui AU9500, capacitor blows
think i have found the problem .i found an original pic .. look where the blown up one connects to .Attached FilesComment
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Re: Sansui AU9500, capacitor blows
In one version the caps were .01µf disc caps, and electrolytics in a different version.Attached FilesLast edited by R_J; 07-31-2021, 02:32 PM.Comment
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Re: Sansui AU9500, capacitor blows
so did it get fixed or not ?Comment
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Re: Sansui AU9500, capacitor blows
My version is with electrolitic cap and when I change it I verify twice if it's polarity is okComment
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Re: Sansui AU9500, capacitor blows
fit it as seen in the pictures .Comment
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Re: Sansui AU9500, capacitor blows
I check voltage on the 2 electrolytics and it seems normal one gray wire have -49 volts and the other with yellow wire have +49 volts , they connect directly on bridge rectifier, I try to switch on amplifier and I remark distortion on one channel and after 1 minute the capacitor goes very hotComment
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Re: Sansui AU9500, capacitor blows
the connections are wrong .. try looking at the pictures we spent time looking for and posting for you .Comment
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Hi people, I hope this is the correct spot to post this, I'm new to the forum.
I have an RTX 3080 Founders Edition which has a burnt up capacitor (it was in parallel with another capacitor which appears damaged too), so I am hoping to be able to identify the capacitor values and order replacements.
I hope these photos make it clear which component I am referring to:
(yes, the soldering is a bit botched from removing the blown one, I know)
I have found the board schematic (attached), but there does not seem to be a boardview available. I have never... -
I replaced some capacitor which is located on optical pickup pcb which is shown in the table below(PCB #2).Because it have been out of order.
Now,It works very well,But I just have found that all caps (6svpc100my and other part number as well) ,which is shown in the table below, has ultra-high ripple current spec.
It is not able to obtain any capacitor which can be a substitute for this ultra-high ripple current nichicon capacitor.
So I replaced it with samxon and rubycon's general capacitor(GP,YXA series).
I know that these capacitor will not last as long as nichicon capacitor... -
I desoldered samwha NF capacitor(50v 5.6uf) from PCB circuit of 29inch CRT TV which have symptoms of no display after I heard sound of inrush of current to TV whenever I switch on this television.
I measured ESR value of this non-polarized capacitor(samwha NF capacitor 50v 5.6uf) by means of MESR-100 ESR meter and It displayed 0.3 ohm
And When I measured its capacitance with digital multimeter and LCR-T4 Mega328 meter, It displayed 10uf from DMM and 8uf from LCR-T4 meter.
I found catalogue of samwha capacitor(samwha-catalogue_3.pdf file), which is attached to this thread,... -
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Judging from above ESR Meter Table,I think It is necessary to replace this sms capacitor.So I visited local electronics shop,and I purchased 160v 2.2uf rubycon YK capacitor.
But when I browse through rubycon YK datasheet,I found that there is no ripple current rating for 160v 2.2uf specification. But On the contrary, I found 39 mA ripple current rating for 160v 2.2uf SMS capacitor.
Rubycon YK DataSheet (b... -
a few days ago I finally purchased mser-100 v2 and I tested its abillity of measuring ESR value.
I found that It shows pretty accurate ESR value for electrolytic capacitor,But When I measure polymer capacitor of dreamcast game console,I found that one third of polymer capacitor's ESR value is more than twice the value of ESR meter table.(for example, I measured one polymer capacitor of 6.3v 100uf, It showed ESR value of 7.68)
Although my dreamcast now turns 20 years old but it still works. I occasionally have played game with it.
Is this ESR value of polymer capacitor correct?...
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