Question about Yamaha Rbx374 4String Electric Bass Guitar

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What potentiometer is being used in rbx 374 bass volume control..because i replaced it with a500 potentiometer but still its not working..i bought yhe bass second hand,,is potentiometers for active pickups diferrent from passive?

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Yes, active use different value pots than passive. The volume control is LIKELY an "audio taper" which can be either an "A" or a "B" marking as there is confusion about the marking. The resistance is likely around 500K ohms down to as low as 50K ohms. The marking MIGHT be something like 504 B or 503 B or the same with the letter "A".

An A500 pot might be only 50 ohms... That would result in very low output. Again, the marking in the industry is not consistent.

Best bet is to get the part from Yamaha. Go to Yamaha America "parts" dept in California. You can search the phone number with Google.

Posted on Oct 11, 2010

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For what piece of gear?!?!?!?!?!?!?

Dec 11, 2015 | Bass Music

Tip

Electronics spray cleaner


The most common problem with guitar amplifiers

and other electronics that are making noise or cutting out

or sticking and not working correctly is a simple fix...

I use Radio Shack electronics spray contact cleaner

for most of my basic repairs

in the pictures posted I show the basics you need....

some screw drivers, basic knowledge, paper towels,

electronics spray contact cleaner, and a knife

First I carefully remove the nobs (volume control, tone control, etc...)

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Then I carefully spray into the (control} and work in back and forth....

the Best way is to spray directly into the potentiometer

that requires access to the internal chassis

on a quality pot there is a Notch that you want to spray into

on a standard pot just spray....

this will repair any scratchy noise or sound that cuts out

on guitar and bass amplifiers,

also can be applied to many other common basic sound problems



I hope this helps someone out?



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1 Answer

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This is not program/software error. This is hardware error.
Damage is on the potentiometer. usually caused by a bad contact inside the potentiometer. The most common is the preamp-TYPE potentiometer.Faulty potentiometer can also occur in the other,
depending on what we hear, when (suddenly) the bass sound bigger or smaller, it mean that BASS potentiometer was bad.
Potentiometer must be replaced,because it can not be repaired or cleaned (except,you are experienced in parts repairing).. This is due to the potentiometer is to use a special type.

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I would get a can of good electrical contact cleaner and open the unit, spray the cleaner into the back of the controls while rotating them back and forth quickly. This will somewhat clean the control contacts inside eliminating most dust and corrosion. If the control is too old and dirty, it may not work but, I would definitely try. It probably has a special made potentiometer that would be hard to find and replace. They usually have special legs attaching them to the board. I am almost positive that the control is bad or dirty, though. If the sound gets loud when almost all the way up, it does indeed work, just not in a dirty position. That already proves it.

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To remove the knob, there should be a small hex key or allen screw on the side of the knob. Just loosen the screw. You don't have to remove it.

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Hi, I have an RBX 374 and I cannot get any sound from it. I have got the wiring scheme but the wiring looks O.K. Some say it might be the pre-amp. Does anyone know what could be the problem...


i dont' see where this model has active pickups (guessing this is what you mean by pre-ampped).
The issue can be in a few places.

1) the strings could be too far from the pickups and the instrument needs to be tuned.
2) the pickups are bad
3) your jack is bad
4) the cable is bad
5) your equilizers are not corrected
6) your volume control is turned down or damaged
7) your amp is damaged

this is a small list of the basic possibilities.

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We have a yamaha guitar which needs repair, the serial numbers don't appear to mactch in my quest for a tech.manual. They are: QJ0093226 (EG-112 GPBL H) Can you help ?


Here is the link you need:http://europe.yamaha.com/en/products/musical-instruments/guitars-basses/el-basses/rbx/rbx374/?mode=model The manual is down loaded in pdf. Scroll down the page. The serial number has nothing to do with the manual only the model number applies.

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Assuming that the amplifier is functioning properly, I suspect that the problem is either in the cord, the plug socket on the bass, or the volume control potentiometer. First, I would try another cord that is known to be in good condition (ALWAYS plug the cord into the instrument FIRST). Second, carefully remove the cord receptacle plug from the bass and examine the solder joints (check for loose wires). Third, carefully remove the plate that holds the volume and tone pots. Examine these controls for loose wires or faulty solder joints. CAUTION: If solder joints are found to be the culprit, care must be taken to correct this problem. If too much heat enters the pot, it can be ruined!

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