MFC-01 funny sound effect

[ncex888]

Hi, I am new to the site.

I have installed a new MFC on my R620. However, the sound effect does not work some how.

This is my problem:
Engine starts sound fine, idle sound is fine. But once I try to throttle up (not matter what level), it will give a high pitch tone. Even i turn the volume down to minimum. If I have the motor disconnected, there will be no high pitch tone. I seem if the motor is connect and starts to draw current, then the high pitch tone comes on.

Any Idea?

I am using Futaba 4YF 75MHz Radio and Futaba R168DF receiver.

Thanks in advance.

[McFig]

Couple of questions.

1. You are using the MFU for Tractor Trucks, no the MFU for Hi-Lifts?

This is the one you should be using: http://www.tamiyausa.com/product/item.php?product-id=56511

2. What motor do you have installed?

[ncex888]

Yes, this is the product I have for my R620 tractor truck.

The motor is just the stock motor 540.

The sound just come out when the build in ESC start to have loading. If I disconnect the motor, there is no problem, sound effects are good.


Thank for the help...

[McFig]

Ummmm. Did you get the MFU used or new?

[ncex888]

I get it new from ebay.

The funny thing is the high pitch tone also come from the MFC unit itself... even I have disconnect the speaker, NO SPEAKER at all.

I have managed to eliminate the high pitch tone on the speaker (adding a crossover, only allow low frequency signal to reach the speaker).

But the tone from the MFC, I have no idea where it comes from. I have a bit of electronic background, never see that before. Usually chip don't make noise!

I think more likely it is a defective unit.

[McFig]

Its starting to sound more and more like it is a bad unit, I'm sorry to say.

If the e-bay seller is a store, I would try and contact them and see if they will replace it. You can also try Tamiya. Not sure who you should call from Canada.

[janderson]

Sounds like a bad unit contact borgfedt of Canada or the purchase place for repair/replacement

[ncex888]

I am contacting the seller now ... and hope to resolve this soon...

Thanks