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Impossible problem?


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jacksonj 
Member - Posts: 24
Member spacespace
Joined: January 08, 2004
Location: Canada
Posted: February 05, 2004 at 12:02 AM / IP Logged  

When you say the parts tested ok on the bench, I'm sure you're referring to each one separtely.  Why not try to hook everything up together outside the car.  Maybe then it may be easier to see the issue and also easier to switch a unit out to test with.

I would test that his HU works with Another amp and sub, and that other HU you had mentioned is able to work with his amp and sub, just to eliminate it further,  these are methods I take when fixing computers or my own car audio problems.

Other then that, good luck.

Simplemitch 
Copper - Posts: 68
Copper spacespace
Joined: April 25, 2003
Location: United States
Posted: February 05, 2004 at 12:16 AM / IP Logged  
i like these last two ideas. i'll do a comparative check of the output signal using o scope once on the bench then once in the car and if prob is not found, ill hook the whole system up on the bench. That ought to discover something. Thanks guys, and if anyone else has some good ideas, dont hold back, i'll take anything.
Mitchell Whitney, Installer/technician
Mainstreet A/V
SDmustang21 
Member - Posts: 33
Member spacespace
Joined: January 03, 2004
Location: United States
Posted: February 05, 2004 at 2:12 AM / IP Logged  

i had a similar problem which might help.  I have a dvc rockford fosgate and would notice that sometimes it lost power.  turned out to be a sort of cut rca which would work when it was jiggled.  that in turn would either cut half the signal going to the sub or give it it's full potential.  Now that i have my whole system out of my car i also noticed that it had a gash in the middle of the run, probably from running it across something sharp.  sound's to me like this might be it..could also be the rca's aren't making contact at the amp or head unit ( loose fit).

I found out that a bad connection to either right or left channel will seriously lower the sound level of a speaker which is bridged from an amp into dvc woofer.

egghh....just something to think about...don't know what kind of woofer he's running

Buy it, install it, play with it. Then take it back out, read the instructions, install it better!
Simplemitch 
Copper - Posts: 68
Copper spacespace
Joined: April 25, 2003
Location: United States
Posted: February 05, 2004 at 8:55 AM / IP Logged  
yeah, i tried new rca cords to no avail. his are also definately ok. I think you guys are starting to see why i named this thread "The Impossible Problem" . How can operational components become un-operational when hooked to each other? I'm gonna have him come in today and try the whole thing on a bench. That will at least determine whether the problem is car related or equipment related.
Mitchell Whitney, Installer/technician
Mainstreet A/V
DYohn 
Moderator - Posts: 10,740
Moderator spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Electrical Theory. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: April 22, 2003
Location: Arizona, United States
Posted: February 05, 2004 at 10:29 AM / IP Logged  

RCA problems was my first inclination too.  Hmm.  Could be that the amp has bad input pre-amplifiers, or it was damaged by the sh*tty original install.  The HU could be shutting down due to a low impedence load on its line-outs.  Try swapping in another amp to test this.

dcgc 
Copper - Posts: 78
Copper spacespace
Joined: August 04, 2003
Location: United States
Posted: February 05, 2004 at 1:01 PM / IP Logged  
I had a problem with my CD not working.
I had used the remote antenna for the remote turn on.
FM worked(as far as sound coming thru), but the CD didn't turn on the amp.
2003 Silverado Ext. cab
Kenwood mp922
Kenwood kgc6042a EQ
JL Audio xr650-csi
MB Quart PSC 213
JL Audio 300/4
pair of JL Audio 12w6v2
JL Audio 1000/1
forbidden 
Platinum - Posts: 5,352
Platinum spaceThis member has made a donation to the12volt.com. Click here for more info.spaceThis member has been recognized as an authority in Mobile Audio and Video. Click here for more info.spacespace
Joined: November 01, 2003
Location: Alberta, Canada
Posted: February 05, 2004 at 1:16 PM / IP Logged  
Chances are that you have the blue wire confused with a blue / white wire. One wire gives +12 volts when the radio is activated and is open with the cd player operating, the other wire gives +12v when either radio, cd or aux input is used. Check to see if these wires are both present, chances are that this is your mystery problem.
Top Secret, I can tell you but then my wife will kill me.
Simplemitch 
Copper - Posts: 68
Copper spacespace
Joined: April 25, 2003
Location: United States
Posted: February 05, 2004 at 4:00 PM / IP Logged  
Forbideen, were you talking to dcgc? cuz thats definately his problem. i've seen alot of people do that with kenwood decks. If you were talking to me, then no, thats not it, cuz the amp doesnt shut off, it just puts out no signal. I'm having him come in tomorrow so i can set it up on the bench.
Mitchell Whitney, Installer/technician
Mainstreet A/V
Simplemitch 
Copper - Posts: 68
Copper spacespace
Joined: April 25, 2003
Location: United States
Posted: February 05, 2004 at 4:02 PM / IP Logged  
Forbideen, were you talking to dcgc? cuz thats definately his problem. i've seen alot of people do that with kenwood decks. If you were talking to me, then no, thats not it, cuz the amp doesnt shut off, it just puts out no signal. I'm having him come in tomorrow so i can set it up on the bench.
Mitchell Whitney, Installer/technician
Mainstreet A/V
mecpcert_1 
Copper - Posts: 83
Copper spacespace
Joined: October 24, 2003
Location: United States
Posted: February 06, 2004 at 5:21 AM / IP Logged  

how many subs are hooked up? are they svc or dvc? when everything works, how long does it play for?  i had a problem with a svc woofer before, it would play when it wanted to. hit a bump and it would come back on. when it stopped playing, if i pushed in on the cone, it would play again. after using my ohmeter, found out it was the tinsel leads between the terminals of the woofer and the cone itself. re-soldered to no avail, it eventually stopped working altogether.

i would also try metering the ac signal rca output from the deck @ the deck. next, meter the same signal @ the rca before the amp. try also continuity test of the rcas.

you mentioned that the amp was rockford. does it have a bass knob? if so, check the connection. rf amps will lose 3db without it hooked up.

do the highs work? 4x6's and 6x9's. most decks shut down the internal amp if a single speaker is shorted to ground or shorted period. if so, that may hinder your signal output to the sub amp. there is only one amp, right? no external x-overs in there? it would help better if there were more specifics about the equipment involved.

 those are just my thoughts...............good luck!!!Impossible problem? - Page 2 -- posted image.

p.s. just curious as to the solution of your ordeal, please let us know what you find.

do it right the first time....less warranty work=more money!:)
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