Need some help. The amp powers on but no sound. The lights all seem to function. The mute button is not on. Has anyone had this problem.
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GK Legacy 800 Problem
- Thread starter mam1862
- Start date
- Feb 12, 2006
- 60,963
- 5
- 220,654
- Disclosures
- Development Engineer-Mesa Boogie, Development Engineer-Genzler (pedals), Product Support-Genz Benz
Is it plugged into your speaker and the SpeakOn twisted to latch? Is your bass and input cable working?
If so, then jumping the effects loop is the next step but if that doesn't solve the problem, the follow-up step is to find a QUALIFIED service tech to properly diagnose the issue. A GK authorized warranty service center would be my recommendation.
If so, then jumping the effects loop is the next step but if that doesn't solve the problem, the follow-up step is to find a QUALIFIED service tech to properly diagnose the issue. A GK authorized warranty service center would be my recommendation.
Could be a bad speaker cable or something is wrong with the cab.
Try a different cable.
Try a different cab.
Could be bass or the instrument cable.
Try a different cable.
Try a different bass.
After that I would try inserting a short instrument cable (jumper) in the effects loop. Series effects loops have a switching contact. If this contact gets dirty or damaged, the signal will not pass from the preamp to the output section. The jumper bypasses the switching contact. Sometimes cycling a plug in an out of the return and send jacks can clear the problem.
If none of these fix the problem, probably time to take the amp to a tech.
Try a different cable.
Try a different cab.
Could be bass or the instrument cable.
Try a different cable.
Try a different bass.
After that I would try inserting a short instrument cable (jumper) in the effects loop. Series effects loops have a switching contact. If this contact gets dirty or damaged, the signal will not pass from the preamp to the output section. The jumper bypasses the switching contact. Sometimes cycling a plug in an out of the return and send jacks can clear the problem.
If none of these fix the problem, probably time to take the amp to a tech.
Thank you for the replies. I will give those suggestions a try when I get home.
I've been using a Legacy 800 for 3-4 years now - never any problems with it, so I don't think what you're experiencing is common.
So you'll need to narrow down the problem.
Start at the beginning of your signal chain and rule out issues with the signal you're sending to the amp = your bass and input cable.
Then check the amp's input jack by plugging a tuner into the tuner out and see if the tuner is getting signal from the input.
Next, check the preamp by plugging in headphones.
Also plug an Aux cable into the aux input and see if that's passing sound.
Next, use a patch cable to connect the effects send and return.
Then, check both ends of your speaker cable.
Ensure that there is continuity from + to + and - to -, then verify there is no short between + and -
Finally, test your speaker cabinet.
By the end of all that, you will either have discovered the problem or narrowed down the issue with enough detail to give good guidance to the service technician.
So you'll need to narrow down the problem.
Start at the beginning of your signal chain and rule out issues with the signal you're sending to the amp = your bass and input cable.
Then check the amp's input jack by plugging a tuner into the tuner out and see if the tuner is getting signal from the input.
Next, check the preamp by plugging in headphones.
Also plug an Aux cable into the aux input and see if that's passing sound.
Next, use a patch cable to connect the effects send and return.
Then, check both ends of your speaker cable.
Ensure that there is continuity from + to + and - to -, then verify there is no short between + and -
Finally, test your speaker cabinet.
By the end of all that, you will either have discovered the problem or narrowed down the issue with enough detail to give good guidance to the service technician.
I plugged the instrument cord into the send and return ports and that worked. Again thanks for the quick fix.
