DC/DC Converter

[Rob. 10+ year member]

I had my Alpine 7909 looked at , they confirmed it needs a DC/DC converter inside cuz it's dead...basically theres no audio output.

The unit turns on , Tuner works etc etc.

Lemme know if anyone can get a new one !

 

thanks

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[DBBOOM 10+ year member]

Wouldnt a piece of wire with a DC input have a DC output? Does it convert the DC level or what?

 

[Rob. 10+ year member]

Wouldnt a piece of wire with a DC input have a DC output? Does it convert the DC level or what?

The DC/DC Conveter is on the circuit board inside the deck of the 7909, not outside.

The cd players turns on, Tuner works, etc etc, but there's no sound output. //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

I had it looked at by an authorized Alpine repair shop here in Canada http://www.wcent.ca/

 

[oldschool4me 10+ year member]

converts 12v to 5v maybe? just a guess.

 

[DBBOOM 10+ year member]

Signal output is usually an AC voltage, thats why this is throwing me.

 

[Rob. 10+ year member]

Signal output is usually an AC voltage, thats why this is throwing me.

I have no idea.. All they said is that it needs a DC/DC Converter.

Im no technical guru here ! //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

 

[DBBOOM 10+ year member]

The DC/DC Conveter is on the circuit board inside the deck of the 7909, not outside.The cd players turns on, Tuner works, etc etc, but there's no sound output. //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

I had it looked at by an authorized Alpine repair shop here in Canada http://www.wcent.ca/

No output on the RCA's or speaker outputs or both?

 

[gsxrjjordan 10+ year member]

My Alpine unit has the DC/DC converter hanging off the back of the unit, attached by a thick green wire (looks about 4GA size, but I'm sure most of it's insulation).

 

[Rich B 5,000+ posts]

The DC/DC Conveter is on the circuit board inside the deck of the 7909, not outside.The cd players turns on, Tuner works, etc etc, but there's no sound output. //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif

I had it looked at by an authorized Alpine repair shop here in Canada http://www.wcent.ca/

Is it different on yours compared to the 30th anniversary 7909, because if Im not mistaken the DC/DC converter is the box on the wiring harness on this 30th ann. edition......

http://cgi.ebay.com/Alpine-7909-30th-anaversity-limited-edition-259-of-300_W0QQitemZ320309290146QQihZ011QQcategoryZ39754QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

 

[Rob. 10+ year member]

Is it different on yours compared to the 30th anniversary 7909, because if Im not mistaken the DC/DC converter is the box on the wiring harness on this 30th ann. edition......

http://cgi.ebay.com/Alpine-7909-30th-anaversity-limited-edition-259-of-300_W0QQitemZ320309290146QQihZ011QQcategoryZ39754QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

The earlier 7909's had it inside on the board.

They showed my their schematics manual where its located.

My unit doesnt have all that....

 

[DBBOOM 10+ year member]

Is it different on yours compared to the 30th anniversary 7909, because if Im not mistaken the DC/DC converter is the box on the wiring harness on this 30th ann. edition......

http://cgi.ebay.com/Alpine-7909-30th-anaversity-limited-edition-259-of-300_W0QQitemZ320309290146QQihZ011QQcategoryZ39754QQssPageNameZWDVWQQrdZ1QQcmdZViewItem

OK got it now, my bad, you are talking about the dc level transformer.

 

[Rich B 5,000+ posts]

OK got it now, my bad, you are talking about the dc level transformer.

Ah, different part.

Got it.

Looked on the PartsStore.com, no luck.

The CDA-7909 is too old for parts.

 

[Rob. 10+ year member]

Some guy in Poland on http://www.talkaudio.co.uk/vbb forum PM'd me cuz he has a brand new one.. His username is wit007.

 

[snoopdan 5,000+ posts]

dc-dc converter is for the higher logic (5 volt and lower) functions of the head unit. It has nothing to do with the AC output amplifier on the board. So it doesnt make sense that your tuner still functions. If the DC-DC converter failed, the unit wouldnt even come on.

Im not entirely sure what your saying your problem is though - is it that the RCA out has no signal on it, or are you trying to use the amplifier in the head unit? Two very different things.

 

[Rob. 10+ year member]

dc-dc converter is for the higher logic (5 volt and lower) functions of the head unit. It has nothing to do with the AC output amplifier on the board. So it doesnt make sense that your tuner still functions. If the DC-DC converter failed, the unit wouldnt even come on.
Im not entirely sure what your saying your problem is though - is it that the RCA out has no signal on it, or are you trying to use the amplifier in the head unit? Two very different things.

ok, they tell me the unit comes on. cd plays, FM tuner etc etc, but theres no sound.

I just called them and they said its the dc/dc converter. Then they told me that after they fix that, there might be other problems too.

I should just sell the unit, cuz I have run out of options. //content.invisioncic.com/y282845/emoticons/crap.gif.7f4dd41e3e9b23fbd170a1ee6f65cecc.gif:crap: