20 Most Recent Line 6 Spider Iii 120 Stereo Guitar Combo Amplifier Questions & Answers

Likelythe connections and or jack for the foot pedal control are making poor contact resulting in triggering these other modes. If not using the foot switch, probablly the problem is poor contact of the switches on the jack.

I suspect that switch contacts are to blame... often the very weak contacts on jacks that are for inserting effects, for example, get oxides on the contacts that forward the signal from the preamp to the power amp block the signal. The quality of many of the jacks used on these amps is really poor.

TRY CHANGING THE KNOB SWITCH.

A pilot light means almost nothing other than the power cord is plugged in and hot and the switch is on. In this case, other lights run from various DC supplies so the inout fuse is presumed to be good... NEVER replace a fuse without knowing what caused it to blow or you will usually do more damage within a unit. There are several power supplies and you will typiclly find +/-15 volts on the op amps and 3.3 volts on the processor logic. Unless something simple like the speaker cable falling off this will NOT be a DIY repair. I would look to see if this speaker cable might have fallen off and ALSO check if you get any sound using headphones.

Download at the Line 6 site... search for your unit there:

http://line6.com/support/manuals/?families=28&submit=Submit&1st=1st

Try here for the info:http://line6.com/community/docs/DOC-4499

Try this site:

http://www.scribd.com/doc/5573363/Line6-Spider3-Guitar-Amp-Manual

Read this cut and paste and verify compatibility as a first step:

<<<
*FBV is not compatible with Spider II 15 or Spider III 15.

**FBV is only compatible with POD 2.0 units with pedal jacks labelled "FBV Pedal." It is not compatible with older units which have pedal jacks labelled simply "Pedal."

(NOTE: FBV is NOT compatible with Ax212™, Flextone™ I, II or HD, POD® Pro, Bass POD®, Bass POD® Pro and Spider™.)
>>>

Note there are apparently several versions. Check compatibility at this site:

http://line6.com/footcontrollers/fbv.html

This is likely a problem with the power supply portion. This SHOULD be an easy problem to find for a technically competent electronic repair person.

Try this site:http://line6.com/community/message/59307

If you have the manual try doing a factory reset. The info is here:http://line6.com/community/docs/DOC-4499 You might also be interested in joining this forum:http://line6.com/community/community/support/amplifiers/spider?view=discussions

output caps are failing.
get them replaced by a professional, unless you know how to safely discharge a capacitor without killing yourself with hundreds of volts. i would recommend to pull the chasis out and send it into line 6, a local amp shop may not be equipt to repair it and potenially cost you more time than just sending it in. also, it will cost the same at the factory
yostamplifier.com

You'll have to remove the amp chassis from the cabinet to get at it. I only came online again today the 27th so I'm sorry I was probably too late to help.Make sure you don't touch anything around the power supply as the capacitors retain a large charge. To partially discharge them, unplug your amp from the wall while it is on and set at low volume levels. Hope I helped.

Manuals to all Line 6 products can be found on their website.
http://line6.com/data/l/0a06000f1627d4547c34accbca/application/pdf/Spider%20III%2075/120/150/HD150%20User%20Manual%20(Rev%20B)%20-%20English.pdf

Sounds like a power supply problem. Likely have to go to a repair shop unless you are electronically capable.

I would expect either a cracked board or bad solder joint is causing the problem.

A few things come to mind. The power transformer could be failing or a capacitor is failed or has a broken solder connection..or a series of bad connections. Spider II's and especially III's are known to do this sort of thing. There is nothing you can do to fix it without taking it to an authorized repair center with your receipt. Repair centers simply get a whole new circuit board to replace the existing one since most of the components are surface mount and programmed chips. If its the transformer then if may be more expensive to fix than it's worth (unless it's still under warranty). With dozens and dozens of components inside these amps, there is no way to pinpoint the problem without hands-on servicing. Check Line 6's website for your nearest repair center. Best of luck!

http://www.line6.com/support/serviceCenters/

If you are not a tech, I suggest you send it to one. If you are, after signal-dropout spray output transistors (one at a time) with component cooler (freeze spray). If still no results, go to the other transistors & IC's. Chances are that will pinpoint faulty component.