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Sony CDX-F7750S Hi I have recently installed a Sony CDX-F7750S I have tuned the radio and preset the stations, the way the manual showed, they work for my journey, and then when i turn my car off, they are no longer stored! How do i sort this problem? Please let me know! Thanks, Chris

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Re: Sony CDX-F7750S

Check the stereo installation.

There is a YELLOW wire that needs to be connected to a Constant +12 volts when the vehicle is OFF.

It is responsible for saving the pre-sets after the engine is off.

Best of Luck.

Posted on Nov 10, 2007

Re: Sony CDX-F7750S

Switch the Red And yellow wire then it work

some car its switch...

Posted on Aug 29, 2008

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Re: Sony CDX-F7750S

Swap the red @ yellow wires over

Posted on Nov 18, 2007

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Crutchfield has the manual on the product page in the Details tab: . Scroll down to the What's in the box section on the right. The direct link to the manual is .

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The low frequencies adjustment is not working when i turn the sub frequency on low it lowers the volume of the bass completely

check the rca cables on the back to see if you might have the sub woofer cable in wrong rca spot

this is how it should be wired from your radio front output a set of rca cables go to the radio input of the eq. if you have sub out on radio it will not be used ... eq takes place of it ... turn off subout on radio ... to use eq or preamp you must have at 2 amps 1 for mids and tweets and 1 for subs to work eq right

then from the eq you have another set of rca cables comming from the front output to your mids and tweet amp and then if you dont have a second amp u wont need rear output move over to the suboutput and run a set of rca cables from eq's sub output to sub amp this is how the audio cable section should be connected if you still dont get it to work proper then then it has a electronic issue and need to warranted out if still in warranty or buy new one .... here is a link to the install manual with a wire diagram for repair shop .....

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IT is good to have separate eq from built in, because you can adjust or eliminate that you want to hear. For future problem please visit my site at

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in the unit cd player and radio are two different just check out with another cd first to confirm the fault.also if it shows "no cd error code" that means either the cd is faulty or the internal cd lens is faulty so its not reading the cd.but if its showing no such error and display is blank then,first try cleaning the cd tray with tissue paper and check if still the same problem its internal circuit error that needs to be checked with multimeter and repaired.mostly the repairing cost of circuit is minimum.

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How to wire an eq to car stereo without an outboard amp?

no those wire is not for speakers out put that for signal in put only if there is rca jack follow the instruction and run your cable if your dont know dont guess you will burn unit audio out put if install wrong

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try to use the preset equalizer settings after which you can come back to the parametric equalizer and adjust to your own taste. no problem if you don't connect the subwoofer just make sure you set the hi-pass filter to off so that you will hear the full range to your speakers. but, I advice you to put a subwoofer. There is more dynamics to the lower freqs too. don't adjust the source level if there is no problem. take note the EQ of your head unit is a parametric equalizer. hope this helps while you read about parametric EQs.

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Sens is ussually a term for the more common "remote
" wire. You will need to look at diagram to be sure but Im about 99% positive that in your case the sens wire is the input wire for a switched ingnition, especially since you say it is located next to theGND and BATT wires. You will need to connect the SENS wire to 12v hot, similar to the BATT wire but this wire will need to be switchable, meaning it can be turned off and on, say when you turn your key on and off, or when you turn your radio on and off. For example, the remote wire output from the back of an aftermarket cd player, ussually blue with a white stripe or just blue, or the ignition wire of your aftermarket radio, ussually red, or the ignition wire of your factory radio, or any 12v switched fuse in your fuse box. They will all work. In a worse case senario, if you have trouble locating a true ignition wire, there is a short cut. If the EQ has an actual power button that you can turn on and off, you can make this short cut by wiring the SENS wire to the 12v hot BATT wire. Then you can manually turn the eq on and off with the power button. Just remember if you wire it up this way, and forget to turn it off when the vehicle is not running, after about 24 hours or so, the battery may be drained somewhat, and you'll have trouble starting your vehicle. This is definately your last option.

The BATT wire needs to go to the hot in the BATT or the memory ( yellow) from the aftermarket CD player. The GND needs to be connected to anything metal in the car that is connected to GROUND, for example the frame work of the dash board that is metal, or the ground wire from your aftermarket radio ( black).

The rca input will be the RCA;s coming from your cd player.

the rca output will go to your amplifier.

Placement is completely up to you.

If it came with brakets, placing it flat against the underside of the dash board should work. But it could litterally be anywhere, and any where where it will suit your needs. Glove box works well too, so does in side the arm rest console, if you can get you wire to reach good luck.

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Car radio codes fiat

call the dealer service department they should have access to the codes to inform you. for free

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CDX-F7750S - Preset Stations Are Lost When I turn My car off.

check the wiring and see if you constant power is connected if its not connected you don t have no memory on the unit if its connected check constant power fuse on car

Nov 09, 2007 | Car Equalizers & Crossovers

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