Hi
i have a sound king skak20ra guitar practice amp
worked fine for ages, but then i plugged a mic jack plug in wrong hole and
all it does is make a fairly loud buzz now.All fuses are ok.
Does anyone have any idea what it could be and if i could repair it myself,
I have fairly limited electronic experience but can solder ok, pcd looks
pretty basic if it was just a case of soldering a new cap or whatever
hope one of you bright people out there can help

cheers
Dave

Dave wrote:
Hi
i have a sound king skak20ra guitar practice amp
worked fine for ages, but then i plugged a mic jack plug in wrong hole and
all it does is make a fairly loud buzz now.All fuses are ok.
Does anyone have any idea what it could be and if i could repair it myself,
I have fairly limited electronic experience but can solder ok, pcd looks
pretty basic if it was just a case of soldering a new cap or whatever
hope one of you bright people out there can help


Gonna take a lot more info than that; starting with 'which' hole could
you possibly have plugged something into, which would kill the amp. My
feeling is that the two are not connected.

More symptoms, please. Does it pass any signal at all (however noisy or
distorted) when you plug a *guitar* into it?

jak
cheers
Dave

"Dave" wrote in message
m...
Hi
i have a sound king skak20ra guitar practice amp
worked fine for ages, but then i plugged a mic jack plug in wrong hole and
all it does is make a fairly loud buzz now.All fuses are ok.
Does anyone have any idea what it could be and if i could repair it
myself, I have fairly limited electronic experience but can solder ok, pcd
looks pretty basic if it was just a case of soldering a new cap or
whatever
hope one of you bright people out there can help

cheers
Dave

Sorry for the poor info jak
What i did was plug a mic kack into the look socket on the back (dont ask me
why) and then when i turned it on again all it did was buzz fairly loudly.
none of the volume knobs or anything else works when i plug the guitar in
just a constant buzz
hope that will help
many thanx jak
Dave

that should be mic jack into the loop socket
my poor spelling again
"Dave" wrote in message
...

"Dave" wrote in message
m...
Hi
i have a sound king skak20ra guitar practice amp
worked fine for ages, but then i plugged a mic jack plug in wrong hole
and all it does is make a fairly loud buzz now.All fuses are ok.
Does anyone have any idea what it could be and if i could repair it
myself, I have fairly limited electronic experience but can solder ok,
pcd looks pretty basic if it was just a case of soldering a new cap or
whatever
hope one of you bright people out there can help

cheers
Dave

Sorry for the poor info jak
What i did was plug a mic kack into the look socket on the back (dont ask
me why) and then when i turned it on again all it did was buzz fairly
loudly. none of the volume knobs or anything else works when i plug the
guitar in just a constant buzz
hope that will help
many thanx jak
Dave

"Dave" wrote in message
m...
that should be mic jack into the loop socket
my poor spelling again
"Dave" wrote in message
...

"Dave" wrote in message
m...
Hi
i have a sound king skak20ra guitar practice amp
worked fine for ages, but then i plugged a mic jack plug in wrong hole
and all it does is make a fairly loud buzz now.All fuses are ok.
Does anyone have any idea what it could be and if i could repair it
myself, I have fairly limited electronic experience but can solder ok,
pcd looks pretty basic if it was just a case of soldering a new cap or
whatever
hope one of you bright people out there can help

cheers
Dave

Sorry for the poor info jak
What i did was plug a mic kack into the look socket on the back (dont ask
me why) and then when i turned it on again all it did was buzz fairly
loudly. none of the volume knobs or anything else works when i plug the
guitar in just a constant buzz
hope that will help
many thanx jak
Dave




Its possible that the loop skt has a break contact like the headphone skt
disconnects the speaker in a domestic amp. It could be oxide on the contact
causing a poor connection and allowing mains hum instead of the signal
through to the final amp stage. With the amp unplugged - squirt the skt with
switch cleaner (WD-40 might do) and work a plug in/out of the skt, dry off
any excess fluid and try the amp.

thanx I.F i`ll give it a go and tell u how i have gone on
cheers
Dave


"I.F." wrote in message
...

"Dave" wrote in message
m...
that should be mic jack into the loop socket
my poor spelling again
"Dave" wrote in message
...

"Dave" wrote in message
m...
Hi
i have a sound king skak20ra guitar practice amp
worked fine for ages, but then i plugged a mic jack plug in wrong hole
and all it does is make a fairly loud buzz now.All fuses are ok.
Does anyone have any idea what it could be and if i could repair it
myself, I have fairly limited electronic experience but can solder ok,
pcd looks pretty basic if it was just a case of soldering a new cap or
whatever
hope one of you bright people out there can help

cheers
Dave

Sorry for the poor info jak
What i did was plug a mic kack into the look socket on the back (dont
ask me why) and then when i turned it on again all it did was buzz
fairly loudly. none of the volume knobs or anything else works when i
plug the guitar in just a constant buzz
hope that will help
many thanx jak
Dave




Its possible that the loop skt has a break contact like the headphone skt
disconnects the speaker in a domestic amp. It could be oxide on the
contact causing a poor connection and allowing mains hum instead of the
signal through to the final amp stage. With the amp unplugged - squirt the
skt with switch cleaner (WD-40 might do) and work a plug in/out of the
skt, dry off any excess fluid and try the amp.

tried cleaning the jack as you said still with same problem of loud mains
hum
just looking on the cicuit board and there is a small component tda2030a,
amplifier i think, that has 4 small burn marks around its solder joints on
the pcb could that be the culprit would that cause the symptoms

cheers
Dave



"Dave" wrote in message
m...
Hi
i have a sound king skak20ra guitar practice amp
worked fine for ages, but then i plugged a mic jack plug in wrong hole and
all it does is make a fairly loud buzz now.All fuses are ok.
Does anyone have any idea what it could be and if i could repair it
myself, I have fairly limited electronic experience but can solder ok, pcd
looks pretty basic if it was just a case of soldering a new cap or
whatever
hope one of you bright people out there can help

cheers
Dave

Dave wrote:
tried cleaning the jack as you said still with same problem of loud mains
hum
just looking on the cicuit board and there is a small component tda2030a,
amplifier i think, that has 4 small burn marks around its solder joints on
the pcb could that be the culprit would that cause the symptoms

Probably. I don't see how plugging a mic into the loop jack could have
caused it, though. Maybe it was something else you plugged in there?

In any case, it does look like it's knackered. You could possibly try
to replace the chip amp circuit.
http://www.electronica.ro/audio/TDA2030A.shtml for a generic schematic
using the TDA2030a; or google your amp model ##...in fact, check out
http://www.harmony-central.com/Guitar/Data/Sound_King/SKAK20RA__-01.html
where two out of three reviewers had technical problems with the model.

Probably it was just time for this one to go to that Big Stage in the
Sky...not your fault at all.

jak

cheers
Dave



"Dave" wrote in message
m...
Hi
i have a sound king skak20ra guitar practice amp
worked fine for ages, but then i plugged a mic jack plug in wrong hole and
all it does is make a fairly loud buzz now.All fuses are ok.
Does anyone have any idea what it could be and if i could repair it
myself, I have fairly limited electronic experience but can solder ok, pcd
looks pretty basic if it was just a case of soldering a new cap or
whatever
hope one of you bright people out there can help

cheers
Dave