So I have a Fender 65 DSP amplifier. Every time I plug any cord into the input, major white noise comes out. This happens even when the cord is un-attached. Also, sound will still come out of the speakers if I plug a guitar into it. This isn't the typical white noise that amplifiers usually make, this is loud noise that can drown out the sound of anything else coming through the speaker. I tried plugging in headphones to see if it was the speaker but the white noise persists. Is it a defective jack? Something internal? Is this something I can fix myself?
Clean your control pots on your amp with spray cleaner. i forget the name but phone a music store and they should know or may even have some
First checkout your cable
if you still have problem , change you pickup
SOURCE: amp turns on but no sound even with diff guitars and cords
Hi Dan
I wish I could just say what to fix, but you can not do this at home. Line 6 is a great amp and worth the time taking it down to the music shop , to be looked at an give you a repair estimate. good luck keep on rocking in the free world. DFD
SOURCE: i have a line-6 spider 30 amp that started humming
output caps. dont beat up your amp. crazy
yostamplifier.com
SOURCE: Amp Problem with my Guitar
check to see if your cord is plugged into the instrument input and not another input such as a CD input as I have on My amp
SOURCE: I have a Frontman Fender 25R, it has a power, the
You actually have the "B" version as the original 25R doesn't have RCA jacks. Anyway, on with your problem...
I want you to do a test: With a set of headphones plug them into the preamp output and then play your guitar... don't expect much loudness, it may be very faint and will ONLY be in one of the sides of the headphones. This tests the preamp section... have the guitar volume wide open.
IF you can hear the guitar that way, then the switch contact on the PA INPUT jack (not the preamp output) is not making contact. These jacks are really poor and the problem is not that uncommon. Fix is to open the unit and increase the spring tension on the contact or replace the jack. Never use the jack as they worsen evertime you plug something into it.
Note that the failing switch symptom MAY be broken soldering in the vicinity of the jack so look for that also. And also check the soldering of the guitar input jack as that is a common problem. Always loop your guitar cable through the handle so tripping over the cable doesn't break the jack by yanking the plug sideways... another common problem.
SOURCE: Last night I took it to a performance,. I plug in
Here you go:
http://elektrotanya.com/yamaha_stagepas_300.pdf/download.html
Scroll down to "Get manual" on the webpage and click to download. IGNORE other download links. This is a class D amplifier and the switching power supplies run directly off the power line so as a qualified technician I am sure you know to use an isolation transformer while working on this for personal safety. I am GOING to make an educated guess at the problem... The circuitry has a surge limiting precharge for the input power filter with a thermistor that when power is almost up and circuits are balanced the thermistor is shorted out by a relay so that the high currents can be handled... I suspect that the thermistor has gone bad... now that can be due to a short in the rectifier filter combination OR even a failure in the switching power supply or lastly, just a part failure of the thermistor. Using an isolation transformer, ALSO put a 100 watt incandescent lamp in serie with the power input cord to act as a resetable fuse and current limiter while working on this. Let me know how it goes...
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