Peavey PA needs repair

DaFiz

I have a Peavey 4 channel PA (I think it's a XM 4?) emitting a serious hum to the speakers when nothing is plugged in.
It sounds like a short would on the input lead. At least it aint stone dead. It's not a professional instrument so I'm not gonna send it to the agents and pay some ridiculous price for the repair. I'm hoping there's an electronics repair person somewhere that might be able to fix this easily. I use it for myself only... guitar, mic, drumbox etc.
Any ideas...? :-\

Heath

try removing the ground on the plug , you may be picking up mains hum

DaFiz

It's not just a ground hum. The amp was working fine until last weekend and now it's a real loud buzz... like a dead short on the input. ?

AlanRatcliffe

Could be anything. Take it to any electronics repair place. Proteknik (SP?) in Claremont is one - they fixed a Peavey amp of mine once.

DaFiz

Thanx Alan. I'll take it down to the local repairshop. ?

Long as I don't have to take it to the agents :'(

DaFiz

I have telephone numbers for PA repairs in the Southern Suburbs but nothing in the Table View area.
A bit difficult travelling with a PA on a motorcycle.
Any PA repair peeps in the Blaauwberg area...? :-\

Karel-Mars

Hi, a common problem with Peavey's is that the FX send and return jacks goes open circuit even with no jacks inserted.

Try running a jack to jack (patch cord) from FX send to FX return. How does the PA sound now?

Neps

Tail0n wrote: try removing the ground on the plug , you may be picking up mains hum

Just a side note.....NEVER remove the earth from the plug!! This is a common mistake that can get you electricuted VERY quickly! Yes, I know there are people who have been doing it for years and nothing has happend.. but trust me, better safe than sorry.

DaFiz

Karel Mars wrote: Hi, a common problem with Peavey's is that the FX send and return jacks goes open circuit even with no jacks inserted.

Try running a jack to jack (patch cord) from FX send to FX return. How does the PA sound now?

That sounded feasable and logical as I use a digital delay for effects. I fetched the lot from the garage and set it up trying this and other but to no avail. I still have a loud hum to the speakers. I have a techie at Hamrads in town willing to look at it for me, but I ride rather than drive to work so I still need someone locally to do this.
:-\

DaFiz

The amps is back from repair. R500 and the job is done and it's working fine, however...
Previously the reverb unit had been removed and I've been looping it through a delay pedal.
The effects master control adjusts the degree of effects from the delay pedal, and each input has it's own adjuster as well, so the acoustic guitar could have some delay and the mic could be effected to a different degree.
Now it seems the repairman has fitted some kind of reverb unit and it's buzzing so I turn it off and the mic is now using a jack instead of a canon and going straight into the pedal while the acoustic guitar has to stay dry.
I wonder if I should simply disconnect the reverb unit and return to my previous method...?
Any suggestions...?
This is only for my own practise and not part of the band equipment. 8)

AlanRatcliffe

DaFiz wrote: I wonder if I should simply disconnect the reverb unit and return to my previous method...?

I don't see why not. You might be able to simply turn the onboard reverb off, otherwise disconnect it. I'm guessing it's a spring reverb? The Peavey spring units have a tendency to "crash" at the best of time and sometimes the transducers come loose, making them do all kinds of nasty things like feed back.