[TechAssist] Re: Sherwood -S2660 CP Stereo Amp. Help?. Blown (both) speaker
- From: "Hoyt's TV" <hoytstv@xxxxxxxxxxx>
- To: <techassist@xxxxxxxxxxxxx>
- Date: Sat, 11 Mar 2006 18:54:48 -0500
I've had caps in my test speaker leads for many years because I got tired of
replacing them.
Haven't lost one since.
Don't know if it's politically correct or not, and don't care.
Russ Hoyt
Hoyt's TV
Exeter, NH
----- Original Message -----
From: "Tel-Tek Electronics" <teltek3@xxxxxxxxxxxx>
To: <techassist@xxxxxxxxxxxxx>
Sent: Saturday, March 11, 2006 5:23 PM
Subject: [TechAssist] Re: Sherwood -S2660 CP Stereo Amp. Help?. Blown (both)
speaker
> Hey Peter..Can I "Capacitance Couple" my Test speakers?
> Seem to blow one or both each year, and I do very little Audio.
>
> I found Audio a pain in the rear...due to what the customer would hook
> up, after he got the unit home.
>
> Used to do allot of Pioneer Car Audio in the 80's...The kids would bring
> these back every couple of months, expecting warranty...hooked up with
> common grounds...150W to 300W...mismatched speakers...tin foil in fuse
> links...I just could not keep up....
>
> Tell me...are kids getting any better? ;-)
>
> -Ed-
> Tel-Tek Electronics
> Ontario-Canada
>
> TechAssist Member 2003.
>
> PS:
> If replying to this email, please include all threads.
>
>
> teltek3@xxxxxxxxxxxx
>
> Peter oliver wrote:
>> I agree change the IC, the hum is most likely DC voltage going to the
>> speakers, Our test bench speakers are capacitor coupled to prevent DC
>> shorts
>> from blowing them, with a hum and blown fuses you must check the
>> customers
>> speakers and wireing as they are the most likely cause and/ or are
>> damaged
>> from the short in the amps output, since you may fix the amp to have it
>> blown by the customers damaged speakers/wires. We have seen speaker and
>> or
>> wire problems enough that We will not warranty any amp work if the
>> speakers
>> and wires are not checked. (make sure they didn't use car speakers,
>> non-powered sub woofers, ... etc-- any low impedace/high draw item) The
>> only
>> other cause for a hum might be bad grounds, filter caps or a predriver
>> but
>> output IC is most likely.
>>
>> Peter Oliver
>> Tucson Radio TV
>>
>> From: Tel-Tek Electronics <teltek3@xxxxxxxxxxxx>
>> Reply-To: techassist@xxxxxxxxxxxxx
>> To: techassist@xxxxxxxxxxxxx
>> Subject: [TechAssist] Re: Sherwood -S2660 CP Stereo Amp. Help?. Blown
>> (both)
>> speaker fuses. Replaced, now loud hum?
>> Date: Sat, 11 Mar 2006 15:55:21 -0500
>>
>> Definitely change the STK2250, only about $10 from www.pacificsemi.com
>>
>> Not to presume that this will fix your problem, but a good start.
>>
>> You need a minimum order of $25 to order from them, so you may do better
>> trying to get it locally.
>>
>> -Ed-
>>
>>
>> Tel-Tek Electronics
>> Ontario-Canada
>>
>> TechAssist Member 2003.
>>
>> PS:
>> If replying to this email, please include all threads.
>>
>>
>> teltek3@xxxxxxxxxxxx
>>
>> Robinson Electronics wrote:
>> > Can any of you stereo Techs. help me with this receiver?
>> > Never worked on Sherwood amps.
>> > Both of the speaker fuses were blown, replaced fuses "5A", now has a
>> loud
>> > hum noise when powered on, even with volume all the way down.
>> > This one uses 1 IC (STK2250), don't have a datasheet on it, and cannot
>> tell
>> > if it is causing the problem - still checking.
>> > Pins 4,5, & 6 are reading a "short" together, and
>> > 10,11,12, &13 are also reading a "short" together?
>> > Can anyone help me with this, very much appreciated.
>> > Thanks. David.
>> >
>> > Robinson Electronics
>> > 1075 Sweeten Creek Road #51
>> > Asheville, NC 28803-1757
>> > Ph./Fax. 828 274-3787
>> > Toll Free. 1-888 ROBELECT
>> > www.robinsonelectronics.com
>> > www.robelect.com
>> > Mailto: RobinsonElectronics@xxxxxxxxxxx
>> >
>> >
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