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Question about Alpine CDA-7840

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Alpine CDA-7840 Just installed in a 92 4Runner, Rear channel speakers do not work with the CD. Have check the balance and the fad. Everythings is fine with just the radio.

Posted by Brad Chasteen on

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Brian Neathery

Brian Neathery

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Some 4-Runners have a factory system that uses a separate amplifier to power the rear speakers. In this case you need to activate the amplifier using the blue/white remote output from your Alpine deck. It sounds like the wire that activates the amplifier is currently attached to the deck's blue "power antenna" output, so that the amplifier is only on when the tuner is selected. Disconnect whatever is attached to the blue wire behind the deck, and attach it to the blue/white wire instead. That should solve the problem.

Posted on Jun 09, 2007

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Alpine CDA-9885 has no sound to rear speakers when playing a CD. Works OK when in tuner mode?? What up??
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I have the alpine cda-7894 in my 1994 mustang. I have the mach speaker upgrade. When I play my music the sound has no depth and sounds very flat with no bass, but if i change the balance to the right or...
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Feb 10, 2011 • Alpine CDA-7894 CD Player
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How do you set the time on a CDA-7840 car stereo?
Look on page 27 of this owners manual.
http://vault.alpine-usa.com/products/documents/OM_CDA-7840.PDF
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Chips fail, even for the best of us! If the preamp outputs are still fine, you can purchase a small 4 channel from Alpine for 100-150. About the same as a repair yet cleaner power. Check EBAY there's always good deals to be had!
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May 22, 2009 • Alpine CDA-9855 CD Player
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How to ajust speaker front to back
Hello bill_cordova,

Start with the "AUDIO" button. Press it until FAD appears in the display. Press the up/down buttons to adjust front/rear balance. FAD:F15-FAD:R15 is displayed as the front/rear balance is moved from front to rear. FAD:0 is the center position with the balance equal between the front/rear speakers.

Hope this helps. If it does, please rate as "FixYa".
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Problems with amp or stereo
check out www.installer.com
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The amp wires only go to the rear output (rca jacks on back of cd player)
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Jan 16, 2009 • Alpine CDA-9856 CD Player
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No Sound from rear speakers when playing cd Alpine CDA-9851
See page 13 in the manual and make sure BBE is the same across all modes (sources)
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Nov 19, 2017 • Alpine CDA-9851 CD Player
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Works fine through 4 chnl. amp on radio until you switch to cd then rear speakers turn off
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What kind of car did you install this in? Did it have a factory radio in it? If I had to take a guess I would think that there is a factory amp that you may have hooked the blue wire from the alpine deck to. If this is the case when you switch to CD the alpine deck turns off the power to the power antenna lead(blue wire) and thus your factory amp. If this is the case hook the factory amp turn on to the blue and white wire and you should be good to go.
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alpine 7840 has power but no sound. all speakers are connected corectly,except for a pink and black one. i have no place for it. what do i do?
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Be the first to answer Dec 26, 2009 • Alpine CDA-7840

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