Question about Alpine CDA-7843

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Alpine CDA-7843: All functions on the deck work except when unit is bumped- acts like a power problem. when the faceplate is moved up or down slightly, unit will come on until car hits a bump- very intermittent. Tried cleaning contacts with no help. Faceplate is tight to it's mount but seems loose because of linkage inside for tilt or opening the CD compartment.

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6 Suggested Answers

  • 105 Answers

SOURCE: Alpine CDE 9881

You must have a faceplate from that exact model, no others will work. You can try to contact Alpine for a replacement. If it is any consolation, someone has a useless faceplate, because it won't work with anything else, either. Try running an ad in your local lost & found column, you just might get lucky, especially if you offer a reward.

Posted on Jul 28, 2007

TekTrax
  • 2 Answers

SOURCE: Alpine cd redeiver CDA 7837

Just a guess, I’d say who ever installed it didn’t hook up the connector behind it. But lets say they did. In most cases, the radio’s connector bundle will have a fuse. It’s a good idea to check your car’s fusebox first to see if any fuses are blown there. In either case, if you replace a blown fuse with "the right value", and it blows again, have a tech check it out. Note that if you try to get to the rear of the unit, do a little research into how the radio is accessed through the dashboard. Most car radios aren’t quickies to get at and some folks can do damage trying to get at it, but if you methodically take logical steps, you should be able to pull the radio, check the connectors, locate the fuse if it has one. Of course, there may be a wiring incompatibility, meaning, the OEM radio had it’s own specific wiring harness, the Alpine was installed, but someone didn’t get the adapter harness to fit the car. Who knows. Good luck. TekTrax

Posted on Nov 03, 2007

  • 48 Answers

SOURCE: car cd player

You shouldnt have any problem at all. These don't use any special anti-theft features that would keep you from using any faceplate. 

Posted on Oct 21, 2008

rangegul3
  • 59 Answers

SOURCE: faceplate for alpine model cde7853

go on google then click on shop it is te best way to buy items hope this helps.

Posted on Dec 31, 2008

  • 323 Answers

SOURCE: alpine 7835 display lights not working, everything else is fine

if it's not under warranty, I would advise taking the face plate apart and checking for burned spots on the board and using compressed air to remove anything that is conductive that may cause a short in the face plate. The face plate should be really easy to take apart.

Posted on Feb 11, 2009

  • 21 Answers

SOURCE: Need pinout for Alpine CDA-7940 head unit

facing the back of the 7940 the top left corner is pin 16 the top right corner is pin 9. The bottom left is pin 8 and the bottom right is pin 1. Only a few of the 16 pins are used due to this unit only having pre-outs, no internal amplifier on this unit. Pin 1 red (ignition), Pin 2 pink/black (interrupt), Pin 3 orange (Illumination), Pin 8 black (ground), Pin 9 blue (power antenna), Pin 10 blue/white (remote turn on), Pin 16 yellow (battery).

Posted on May 19, 2009

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Hi there,
If this model has a detachable faceplate,
Remove the faceplate and clean down the contacts with metho and a cotton bud. 
Over time usually corrosion and dirt etc builds up on these terminals making them loose cotact when you touch the faceplate.
This is the most commonly known problem alpine units.
Other common problems is the power supply failing /amplifier.
Hope this helps you out
Cheers
Steve

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