Nashville 400 Shrieking Noise

steve takacs · Post by **steve takacs** » 30 May 2005 7:01 am

After an hour of so of playing, or even if the amp is on and is not being played, my Nashville 400 sends out a shrill sounding, continuous shriek. Anyone had a similar problem and if so what might it be and, how did you solve it? Thanks, steve t

Jack Stoner · Post by **Jack Stoner** » 30 May 2005 9:23 am

When it does it, turn the reverb control to 0 (off). If it goes away, it's a bad connection at the "Molex" connector for the reverb. The "molex" connector is a white/cream colored plastic connector on the underside that plugs into the chassis.

Many times just unplugging it and plugging it back in will clean up a dirty connection. Sometimes it takes contact cleaner on both the female and male pins and in some extreme cases a female pin may need to be carefully and slightly closed so it makes better contact.

Curt Langston · Post by **Curt Langston** » 30 May 2005 10:07 am

Yes Jack is right. This is a common occurrance in these Nash. 400's. I've seen two do that very thing. They were both fixed by simply unplugging the Molex connector, then replugging back in. Sometimes a little contact cleaner spray will help before you plug back in.

J D Sauser · Post by **J D Sauser** » 30 May 2005 12:20 pm

It's a Peavey, isn't that they way they're supposed to sound?

On a more serious note... the Molex connector issue is indeed likely to be the reason for your problem. Been there - Done that... with contact paste.
I also had a similar sound after somebody else (the friendly guy with the brown truck) had transported it... turned out that the springs in the reverb box had entangled themselves... I do not need to explain what to do if that's the case

.

... J-D.
[This message was edited by J D Sauser on 30 May 2005 at 01:23 PM.]

Mike Brown · Post by **Mike Brown** » 31 May 2005 6:57 am

Steve, let me know if I can be of assistance from the factory. My e-mail address is mikebrown@peavey.com

Ray Minich · Post by **Ray Minich** » 31 May 2005 9:09 am

Quit pinching it!

Vern Wall · Post by **Vern Wall** » 31 May 2005 2:27 pm

Quit pinching it!

steve takacs · Post by **steve takacs** » 1 Jun 2005 3:39 am

Jack, Curt, JD, and Mike, many thanks for the helpful hints. The Nashville 400 is packed up now as we move from one place to another here in Beijing, but I should be able to try out the suggestions prior to coming back to the USA in mid-June. I do appreciate your taking the time to respond. steve t

steve takacs · Post by **steve takacs** » 12 Jun 2005 6:22 am

PRESTO! As the experts suggested, I did go for the Molex cable, and cleaned it. Played the guitar for two hours and no shrieking noise. I'll try it for a longer time period when I return to China in August, but I think the problem has been solved. Thanks boys. steve t

Richard E. Lee · Post by **Richard E. Lee** » 12 Jun 2005 5:33 pm

Steve..how timely. i just went through this with my Session 400. Turns out I too cleaned the 4 pin reverb connector...worked for awhile..and started acting up again. Took it to a good Tech.. and he showed me on the circuit board there were the 4 pins..(2 send the reverb..and the other 2 recieve the signal)..anyway the connector was not making a good connection..and allowing one of those wires in the harness..not to grip the pin. Anyway, he replaced the little female (grip) pin from inside the 4 pin connector. Apparently, as we move this stuff in and out of the trucks..the vibration over time..allowed this to work loose..and caused the intermittant problem..
Bottom line,,the cleaning helps for a short time..(just because you have now relocated the connector..ever so slightly) but this may surface again..soon..Hope this helps..[This message was edited by Richard E. Lee on 12 June 2005 at 06:34 PM.]

steve takacs · Post by **steve takacs** » 15 Jun 2005 4:10 am

Richard, thanks for the tip for sure. Was only one of the four female (grip) pins from inside the 4 pin connector replaced? I'll keep an eye on this as a possible problem should the amp begin shrieking again. steve t

Jim Cohen · Post by **Jim Cohen** » 15 Jun 2005 5:26 am

I get a similar shrieking noise every time I play, regardless of what amp I use. I finally tracked down the problem; it was my wife...

Richard E. Lee · Post by **Richard E. Lee** » 20 Jun 2005 5:29 pm

Yes, Steve,, he had a jumper tied into one of the 4 pins.. and the culpert was that loose connector on the grabbing one of those studs (pins). Apparently there are 2 studs that control, sending the signal..and another 2 that control the receiving signal...with a small space between the 2 .
If you (gingerly) pull that white connector off from the studs on the Circuit Board..you'll see the studs protruding down. Perhaps a little mirror up under there would make it easier to see. The Tech. actually had the CB out.. so mine was easier to see. If you have anymore problems,, let me know,and I can have you call and talk to the Tech, here that did the work.if that will help you. Sorry I haven't been on the computer very much lately. or I would have been back to you sooner on this problem.

Buck Grantham R.I.P. · Post by **Buck Grantham R.I.P.** » 20 Jun 2005 5:45 pm

If you have that problem on stage ,would it hurt anything if you unplugged the reverb out of the amp and continued to play??

Mike Brown · Post by **Mike Brown** » 21 Jun 2005 5:11 am

Buck, not at all. But, have it repaired.

David Spangler · Post by **David Spangler** » 21 Jun 2005 7:18 am

My experience is to pull the molex plug, clean the pins on the amp PC board, use a tiny screwdriver and insert beside the female receptacles in the molex connector and squeeze them slightly to tighten the contact. Also, there is a contact enhancement chemical called Cramolin which seems to improve contact.

------------------
David Spangler

Jack Stoner · Post by **Jack Stoner** » 21 Jun 2005 7:24 am

If you have the problem on stage, just turn the reverb control to 0 (off). No need to try and unplug the connector as it is usually tight and hard to get at unless you remove the top back baffle.