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I need the schematic to properly reinstall the input jack on a friends LX210

I think it might have a multi-layered board, no signal afther I replaced the broken input jack???

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Posted on Jan 02, 2017

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SOURCE: need to replace output jack and plate

If this is a classic guitar you should take the fretboard problem to a luthier as you could de-value the unit by working on it yourself.

The jack you can replace yourself. Just connect the wires to the new one the way they came off the old one. There are ONLY two wires. You can get replacement jack from severaal sources.

Posted on Aug 24, 2009

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SOURCE: input jack replacement

oh yes it can be fixed quite easily,...but you are best to bring it down to your local music store and have them do it, they'll be fair in price and your amp will be done right,....(no time for that breakin down stuff when your playin your guitar), thanks, cracklin joe

Posted on Jan 07, 2010

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Looks like Q24 changes the gain at IC4-A from low with no input jack to normal gain with a jack inserted. Since this appears to be a guitar amp that expects a floating input plug any connection at the input to say, a mixer etc may cause a re-grounding via that equipment's circuits, thus negating the auto mute...... eggs & suck :-) If using a moving coil meter it could upset things.... an interesting fault! Sorry I can't be more help - Good luck!

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Behringer mixer Eurorack UB802 is losing partial stereo signal in one channel. When I record (audacity software) I can hear both channels but displays one channel. Is it my computer's audio jack t


Sounds like the output cable from the 802 is not correctly pinned to your input on the computer. Fred is on the right track but you may need to take it a bit further.
It may also be helpful to use a Pro USB audio interface such as the Digigram UAX220v2 (line level version).
If you wish to use the computer's on board sound card consider an IHF/Pro interface that converts balanced audio to unbalanced , and the proper cables. Two 3-wire balanced 1/4-inch from the 802 to the left and right inputs of the interface (XLR Male), then RCA (Red and White) to a 1/8-inch TRS Plug cable onto the the computers audio input.
Henry Engineering's Matchbox HD comes to mind.
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1 Answer

How do you save a patch to existing file?


Oh you rigth, but in this model, the pc board is sanwich of 3 layers: 1layer top, 2layer back and 3 layer inside. unfortunatly, the coneccion between the dc input and the components is for the internal layer, I think, the better is to conect for a low resistor outside between dc input and battery

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I have a pmp5000 mixer. I assume I blew powered output b using a speak-on to 1/4 jack and changing speakers with the unit powered on. I would like to repair the unit and would like some advice on what...


The damage MAY be extensive and is NOT usually DIY.

Often the transient from speaker lead accdents arcs between layers of the multi-layer circuit board in the amp. Two or three transistors go out, often a Zener diode and in some cases a metering resistor goes as well as two surface mounted transistors. When arcing occurs, carbon results which is conductive. All this "cancer" has to be removed.

The two and in some units three swtching MOSFETs often short.

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1 Answer

Line 6 Spider IV 30 I have the above amp and there seems to be a short when the guitar input jack makes contact with the chassis. There's a copper contact pad on the sub board that the jack is mounted...


Typical guitar input on a schematic for line 6 shows an inductor between the input jack sleeve connection and the "earth" or safety ground.
I do NOT understand how you could fry one of the voltage regulators via the guitar cable unless you have more than a guitar (other devices) connected to the jack.
ALWAYS power any interconnected audio equipment from the same receptacle or power source to avoid ground bounce/fault damage to equipment.

Jan 08, 2011 | Line 6 Line6 Spider IV 30

1 Answer

My fender hotrod deluxe still produces some sound with the volume at 0, no sound at about 1.5, then regular volume control on up. I know the clean channel sounded better before this problem started. I've...


There are FOUR controls that affect the volume of signals going through plus the tone controlling ones.
and your
You used the word "volume". Based on the schematic, and assuming you are talking about the control labeled "Volume" and not reverb, master or drive, I can give some hints.

OFTEN the resistance element in pots MAY have a bit of overtravel which can act like your unit, but USUALLY not as far upscale as yours appears..

If the control you are refering to is not the "Volume" but one of the others, then there are other things to look at.

The action you describe would be one of probablly an inverse signal leaking through and when you go up to 1.5 you are actually cancelling the leakage.

I SUSPECT you may have a cracked circuit board in the vicinity of the input jacks that is leaking the inverse phase of the input past the input triode tube stage.

Board cracks OFTEN occur near input jacks because people trip over cords... (save yourself by running cord through a handle before plugging in the plug)

This should be easy to find. Connect an audio generator to the input and use a scope to find the problem. Without a scope, use a capacitor to "ground out" suspected signal paths.

On the schematic they show a resistor (10 ohms) from ground near the input to the pot bracket. I have personally SEEN capacitive coupling to pot brackets feeding into the amps from this source sending in stray signals.

If this is connected to other equipment, a ground loop could cause problem, so test with nothing but the guitar connected.

Apr 30, 2010 | Fender Hot Rod Deluxe Guitar Combo...

1 Answer

Is it possible to obtain a replacement pre-amp board for a yamaha hs6 organ? there is a signal coming from the board which can passed through an external guitar amp, via the left or right speaker jacks, to...


Check all the capacitors one at a time for leakage.You might also have a transistor in the preamp stage which is starting to go bad. Whatever you do though don't use the speaker output jacks of the organ as line outs into the input jack of the guitar amp. In a properly working organ you could destroy the output transformer and the input stage of your amp because most speaker outs are A.C. voltage to drive the speakers not low level D.C. which is what your amp is used to. Let me know how you make out.

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1 Answer

Output is low and distorted


The way you troubleshoot this is to divide and conquer. Run KNOWN clean signal into the "Power AMP IN" jack (note that it is a balanced TRS type input).

Verify the power amp downstream is clean. If not, then confine testing to power amp portion.

I would also check that the voltage across R66 is near correct IFpower amp portion is at fault.

I AM suspicious that the voltages on the scjhematic are AC peak to peak values rather than DC...

I think things in ovals are AC and rectangles are DC.

Aug 29, 2009 | Fender Hot Rod Deluxe Guitar Combo...

2 Answers

Static Noise from guitar amp.


I take it you have made sure that both the cable to the distortion box from the guitar and the cable to the amp are both good. From the description you give, it sounds like there is no signal getting to the pedal. If the cable is good, then the next likely suspect would be the input jack on the fuzz box. Try wiggling it a little with the guitar cable in place to see if it is loose. Some input jacks are unbelievably cheap and flimsy. A crackling sound (static like) is almost always a bad connection. If it was the output jack, I would think that the guitar signal would come through a least a little bit, but you might want to try wiggling that one, too, if the input jack isn't the culprit.

Another possibility to check is the battery, but this doesn't seem as likely. Some effects units devour batteries, especially units that use 9V batteries. I have a multi effect pedal that kills a 9V in about an hour.

Jan 22, 2009 | Epiphone Les Paul Studio Electric Guitar

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