[TechAssist] Re: Sherwood -S2660 CP Stereo Amp. Help?. Blown (both) speaker
- From: Eric Manuel <tvman@xxxxxxxxxxxxxxx>
- To: techassist@xxxxxxxxxxxxx
- Date: Sat, 11 Mar 2006 21:23:01 -0330
Hi Ed thats Top Secret Information...
Eric
Eric
E M Electronics
59 Wights Rd
Deer Lake NL
Canada
A8A 2J2
Ph# 709 635 5023
tvman@xxxxxxxxxxxxxxx
eric.manuel@xxxxxxxxx
Tel-Tek Electronics wrote:
> Soooo.is it a National Secret?
> Or do we share? ;-)
>
> -Ed-
> Tel-Tek Electronics
> Ontario-Canada
>
> TechAssist Member 2003.
>
> PS:
> If replying to this email, please include all threads.
>
>
> teltek3@xxxxxxxxxxxx
>
> Hoyt's TV wrote:
>
>>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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