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Re: gem sound karaoke amplifier #exa1005
Please confirm from your speakers cables in good condition and from your speakers.make maintenance to your amp by air blower-clean air filter-keep good ventilation around.after cleaning and good ventilation make test with any media while you are connecting one speaker only and then connect the other one.
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The RCA outs are designed to send a signal to an external amplifier. That amplifier, in turn, sends the music signal to speakers.
The RCA inputs are designed to take audio signals from another device (like an ipod, CD Player, or computer) and play it through the Craig System speakers. If you sing into the microphone, the vocals will be mixed with the incoming music. However, in these cases, there won't be lyrics on the screen. If you play a karaoke DVD in a DVD player, connect the red, white and yellow RCA cables from the DVD out to the Craig Inputs, the lyrics should appear on the Craig screen while the music plays.
If you mistakenly plug RCA cables into the Craig Inputs and plug the other end into an amplifier's inputs, neither will produce any sound.
Using RCA outs is only necessary if you want to have louder music than the on-board Craig speakers can handle. Of course, you can run the yellow video cable to a TV RCA input to get a bigger lyrics window and the RED and White RCA to the TV RCA Red and White inputs to hear the music through the TV's speakers.
I had the identical problem with the same model. Technician eventually diagnosed faulty fan; the fan cools the heat exchanger. When fan fails, exchanger overheats and boiler automatically shuts down. It is possible to restart the boiler when it cools down but when the heat rises again - off it goes! Only answer is to replace the fan.
My technician did the same as yours - on first visit he got the boiler running and left. Half hour later, boiler shut down. I read the installation manual and operating instructions and when he called again I pointed him in direction of fan, which had failed completely. These guys!
It is possible
that the amplifier had encountered a fault with a higher current drain which
had triggered it to a protection fault condition. The fault can be with your
output drivers. Please check for short on the outputs fitted for both the channels.
Use a meter after disconnecting to check for short in the drivers. Disconnect
the positive and negative voltages to the output and see if the protect
changes. Even a fault in the preamp stages that drives in high current into the
output can shut the Amplifier. Sometimes this can be a noise which can be a HUM
or HISS before the protect works. Faulty capacitors in these circuits also can
cause similar issues and needs close observation.You need to confirm and
replace the specific stages or outputs. If not there can be issues in the
mother board. Maybe the protect circuit by itself is shutting off due to a
faulty bias or there is a leak in any voltage/current sensing circuit. Also
disconnect the speakers and test, if the amplifier comes out of the protect
mode then check for short on the speakers.
Make sure the amp is well ventilated, it needs to cool down or else it will shut itself off, then when it has cooled off enough it will turn on again. Also, check your wires especially your power wires. Make sure that they are the correct gauge. If everything looks ok then there may be a fault in the amp.
This amp uses a TDA2050 chip that has thermal protection. It is also a small amp that is NOT capable of high sound levels. If *********** can't stand to be within 5 feet of this amp you are playing TOO LOUD for this amp and it will shut down until cooled off to protect the amplifier chip. This amp is intended for practice. It would be adequate for sensible listening level in a 10 foot by 10 foot room. If you need more sound you will have to get a bigger amp. I would suggest you get a sound meter and verify the sound level. DO NOT exceed 4 hours at 90 DB... I know a lot of deaf musicians that have lost their hearing and they are not much good anymore.
Most 640As suffer from this sensitive issue. It is not a fault, but a protection mechanism that is too sensitive. In some cases, it could be due to the open ground earth issue or Left & Neutral reversed at the wall plug. Check your wall plug's connection and if they are perfect, then it could be because of a electrical issue inside the amp. In that case, get the technical support from CA to fix this.
You say that the CD player goes well and does not shut the system down like the Live connections. This is a single input configuration...
This means that there is sound levels coming in from the live multiple connections that are too strong (Loud) for the amp to handle...
Its a good amp you have as its shutting down to protect itself instead of blowing up....
So.... set up for the live show then disconnect all but one of the live inputs and start the live session if its OK, then connect another of the live connections, and see if its OK, if it is then connect another live one connecting each one progressively until the problem occurs again...this last live connection is the one that is too loud in signal strength for the amp to handle causing the shut down...
Solution is to reduce tha signal on that last cable source to a level that stops the shut down...I remember that groups of guitar players have volume controls on each guitar and if these are set too high then this can occur....specially if they are all using the same amp without a controlled "mixer man" monitoring each input signal.
Rember the small meters on the mixing panel which have a green painted area and a red painted area the "mixer man" must keep the each meter needle in the green zone for all the inputs otherwise a shut down occurs.
Hope this helps you...