QSC Audio Players & Recorders - Page 4 - Recent Questions, Troubleshooting & Support

Burnt out

HI, If there is any lubrication problem or bearing fault the the fan will me noise. Normally the fan will not be very loud. I you have to concentrate hear the sound of fan is it on or not. Here i have added a video which will show you how to lubricate a fan which comes inside electronic equipments. Ajin

Try spraying it with contect electric cleaner it worked for my amps

Hi,this power amp uses 2SA1962 and 2SC5242 output transistors. You can download the schematic diagram from this website.Thanks.gylacz

Could be caused by an internal fuse, but why the fuse blew would be another question.

sounds like the output chip has been fried just take it to a tech not unless u know what u r doing then just fix it youself

This is a very precise questions as QSC amp are pretty rare and high end electronics equipment. There is no way getting an answer other than getting the amp at a sound shop for repair, wich might go for a visit at QSC anyway. From a sound shop repairman...

Aqui esta el manual. Ojala te ayude. El link es:
http://www.qscaudio.com/pdfs/manuals/RMX_3RU_user_manual_ES_revF.pdf
Copealo y pegalo.

Sounds like you need to retrace your solder connections on main board.

Suspect an overload in the main output devices on the heatsink for that channel. One or more of the devices is simply acting like it is a piece of wire. If they are transistors it will be easy to spot them with an ohmeter as it will be just like you have touch the test probes together on touching the terminals of each transistor. It will even do it in circuit, if the fault hasn't blown a hole in it first so you don't need tests. Remember the good channel is the same as the bad so tests on it's transistors etc will be the same as the bad till you find the faulty part! And if it has blown it up the part number is in the good channel so that's one good piece of news.

Unfortunately there is little we can do directly. The output transistors are likely to be shorted on the bad channel. This is not a DIY repair for most people. Expect a repair bill in the $80 range for parts.

Dan

you need to re earth the amp

For QSC amps the GX series are not bridgeable. You will have to run one speaker to each channel.

Register and download the manual for free at retrevo.com http://www.retrevo.com/support/QSC-GX3-Amps-manual/id/23107ag606/t/2/ See page 7. "CLIP: red, to the left of each Gain control.

Normal indication: illuminates whenever the amplifier is driven beyond full power. The LED's brightness indicates the amount of distortion. Distortion that causes only brief flashing may not be audible.

During muting, the indicator fully illuminates. This occurs during normal "On-Off

Hi,

The best way is to make a new cable and connect the tip and sleeve.
Thats the best way to run your QSC, then you're using the balanced input.
But thats only working when the rest of the system is also balanced (snake etc).
Offcourse you can use your instrumentcable, but that is unbalanced and you will loose some gain.

Regards,
Gerard