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My alpine TDM-7534E head unit has intermittent power, wont turn on at power button although backlight is on

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5 Suggested Answers

  • 277 Answers

SOURCE: Wiring on tape deck Alpine tdm-7543

hi there is a manual in the model page click on it page 2 there is a description how to connect the unit good luck

Posted on Mar 21, 2006

tech48
  • 624 Answers

SOURCE: I have an Alpine CDA-9815

It sounds like the sub woofer amplifier is pulling down the voltage level in the truck when it starts to get really loud. It may be the voltage regulator which is probably part of the alternator, or the alternator is not capable of supplying the needed current for the amplifier. If the voltage level drops below a certain level, the radio will see it as if the battery is disconnected. It requires a voltage level of around at least 10 volts to stay turned on. When an amplifier is playing loud, it draws a lot of current. If the current supply does not increase, it lowers the voltage level to compensate and get the current it needs to play at the level the head unit is pushing it to. As the voltage level goes down, the current increases when the voltage is dropping due to increased demand. You could check this with a voltage meter and monitor the level right at the battery and have somebody turn the volume up on the head unit slowly as you monitor the voltage level. The normal operating voltage of a car while the engine is running is about 14.4 volts. It should not drop much at all, no matter how loud the amplifier is playing. if it does drop, you have a problem with the trucks regulator or alternator.

I hope this helps, if you need more assistance let me know.

Dave

Posted on Jul 08, 2008

JustJeeps
  • 74 Answers

SOURCE: alpine CDA 7843E head unit

if this unit has a motorized face the ribbon cable is bad and will need to be replaced

Posted on Nov 28, 2008

  • 1 Answer

SOURCE: removing TDM-7545 unit from dash

i cant seem to remove the unit from the dash ? thanks zac

Posted on Jan 17, 2009

hack124x768
  • 33 Answers

SOURCE: connect alpine 7874 to alpine powered sub

You need to run the RCA cables from the head unit to the sub for the audio signal, and possibly a turn on wire (the blue one on the back of the head unit), unless the sub has an automatic power feature.

The sub also needs power and ground wires attached, but those do not connect to the head unit. Power should be run directly from the battery with an inline fuse, and ground should go to the nearest good ground point (Trunk latch, seat bolt, etc).

Posted on Mar 28, 2009

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