Question about Jensen's VM9312 Car DVD Player

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Volume Knob Not Working... Jensen VM9312

So I was very pleased with this mobile video unit till today. All of a sudden my volume knob decided to go kaput. When I rotate it it just won't work. At first it was working on and off and now it just doesn't work at all. I have searched the net to see if anyone else had this problem with the VM9312 but I couldn't find any. Only the volume function does not work. If I push in the volume knob, the EQ setting comes up which it's supposed to. So I don't understand why the volume would not be working. With the remote it works fine, just the knob doesn't work. Can anyone help me? Or am I going to have to hassle for a warranty repair? Thanks in advance.

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I have the same unit, your unit sounds like its defected. Mine on the other hand has a static noise coming from its speakers, does yours do that too?

Posted on Mar 24, 2008

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I have a Jensen JRV 215n the volume knob won't work got a replacement and same thing volume knob doesn't work

Posted on Dec 11, 2017

  • Craig S
    Craig S Dec 11, 2017

    I have a Jensen JRV 215n the volume knob won't work got a replacement and same thing volume knob doesn't work

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I have the same problems with mine volue nob dosnt work an mo matter how many times I rerun the wires theres still static

Posted on Nov 14, 2014

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Posted on Jan 02, 2017

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There is a crackle when i turn the volume knob.


First unplug it. Sounds like you need to spray some tuner cleaner in the pots that are crackling. Pull the knob off and you should be able to use a spray can of tuner cleaner with the straw that comes with them to spray into the potentiometer , then rotate the pot several times while it is still wet. After cleaning them all, wait 10 minutes and then try.

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Ironic that this popped up today. I just worked on my dads Yamaha RX-V663 today. Have you tried to see if it works on the other speaker channels. Not sure how you have yours set up or how many speakers are attached, but my dads wouldn't work on channel A, I guess it burned up. I basically just moved the speakers over to the surround sound and channel B and everything worked as usual. Oh, and turned off channel A

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Cleaning the contacts may help. The volume knob should pull off. Once its off use a non-flammable contact cleaning spray to clean the contacts behind the knob.

Electronics and automotive stores should have this.

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Volume not function.


You need to be a bit clearer on the exact nature of the issue.
Please include if the unit was working and suddenly stopped producing sound (ie - speaker output fuse blew) or if you relocated the unit, and after hooking it back up, you aren't getting any sound (ie - not hooked up right) or if the volume knob isn't changing the readout for the volume level (logic or knob broken) - and also include the make and model of WHAT the volume knob is attached to (ie - Yamaha receiver model X)

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AUX Jack Wont Work Or Recognize Anything


CLICK HERE for your owners manual in PDF format.

The Aux jack is set to OFF by default on this model.
Please see page 8
ADJUSTING SETUP ITEMS for instructions on how to toggle the AUX jack "ON"

Press and hold SELECT button to enter setup mode.
Press SELECT button until AUX appears.
Rotate the volume knob to toggle the setting to "ON".
Press and hold the select button to return to play mode.

Thanks for using FixYa - a FixYa rating is appreciated for answering your FREE question.

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The rotary volume knob on my DEH 9400MP head unit has stopped working. this also happened to my friend's. the steering wheel remote still works. is this common? can it be fixed please?


Although I can't check this fix works for 1 month, a really simple explanation and fix was offered.

The rotary knob/control has 2 contacts, which when the knob is rotated c/w or anti-c/w it generates a pulse. The diagnosis is that as the remote still works, the PCB & volume circuit is fine. What is likely is that the 2 contacts/switches have become dirty or clogged.

SUGGESTED FIX: Take head unit faceplate apart to access PCB & rear of rotary control (4 screws). Spray WD40 into rear of volume control and rotate liberally to clean contacts. Dry of with lint free cloth, tissue or air dry.

I am confident this will work and the volume control will function again.

Sep 27, 2008 | Pioneer Car Audio & Video

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