mailed radio for repair today. - Page 2 - ZR-1 Net Registry Forums

ffvetteman · 11-01-2006

What is the cdm box?

I have not pulled my stereo yet, but I sispect I will be pulling the head unit next year as the CD player does not work. All the speakers work and if you ask me sound very good!! I think the stereo has a great sound for stock.

tomtom72 · 11-10-2006

Our GM/Bose system is made up of components that are in different locations. The "radio/CD/CA" in the dash is just the place where the tape deck & CD deck and the display functions live, called the head unit or control head unit. I think that there was no room for the rest of what makes the sound system work at that location.

CDM box is the rest of the "stuff" ya need to make the head unit actually do something. It houses the "tuner" circuits for the radio as well as the circuits that "read" the signal from the CA tape heads and the signal from the CD "head"(?). There may also be some kind of pre-amp function in that box because it distrubutes the signal to the speakers and has the circuits that adjust the fade, bass & trebble and it may even house the clock function. The last component are the speakers with their individual amps at the four corners. Oh, yea, I forgot the wiring!

In my 90 the CDM is under the glove box....sort of...and just inboard of the fuse panel. That place that Rich was talking about has an excellant "how to" section that covers the locations of various components (they moved over the life of the C4) and a good step by step on how to do the R & R on the stuff. The early Z CDM box R & R will make ya get religion! There is just not that much room to get human sized hands up in there to work. Ya know what it's like with a C4, 15 lbs o' stuff in a 5 lb bag....and it's a jig saw puzzle to boot! There is a ton o wiring in the way and the bracket that holds it is one of those multi-function types that drive ya to swear!

Tom

Z51JEFF · 01-27-2008

Quote:

Originally Posted by RICHARD TILL

whoever engineered the spot where the cdm box is ought to be shot. i finally got it in after 2-3 cooloffs. with it and the radio is still hanging, i put the power to it. played well except left rear popping and distorted. swapped the rear speaker assy.`s and the trouble moved. i`ll order a new amp tomorrow. looks like its gonna be ok after a little over $400. next time i`ll post maybe willie will be singing "on the road again".

Heres a question I should be shot for asking.Did the CDM go back in easier than it came out?Im putting mine back in tomorrow and Im not looking forward to it.

flyin ryan · 01-27-2008

as i said a few days ago i put the system back in my Ruby. next winter i'll send my 90 unit out so i'm curious if your CDM goes IN easier than it came out for you. if it's a b...atch maybe i'll send my 95 out first ha, ha. no, the 90 has to get done sooner or later. i'm lucky only one of my cars has the box in the bad area, could be all three

.

Z51JEFF · 01-27-2008

Quote:

Originally Posted by flyin ryan

as i said a few days ago i put the system back in my Ruby. next winter i'll send my 90 unit out so i'm curious if your CDM goes IN easier than it came out for you. if it's a b...atch maybe i'll send my 95 out first ha, ha. no, the 90 has to get done sooner or later. i'm lucky only one of my cars has the box in the bad area, could be all three

.

To answer my own question,no,it does not go back in easier.

flyin ryan · 05-24-2009

Got it out of my 90 last night...wasn't too, too bad. I can see it being a pig to get back in though, for sure

.

flyin ryan · 06-05-2009

My stereo showed up from Doctor Don's today. Now we'll see how much fun the CDM box is to get back 'IN' the dash of my 90

.

RICHARD TILL · 06-05-2009

Better keep a New Testament handy. You might need it when all your blood runs to the top of your head from standing on it.

GrayZ · 06-05-2009

richard, missed you at bowling green this year, again???

still racing boats?

RICHARD TILL · 06-06-2009

Yep, I was racing boats. I really wanted to go to the gathering but was in Poplar Bluff, Mo.. Got a 4th place out of a class of 14. I broke out with a 9.883 and other guy ran a near perfect 10.02 I`ll be up in your neck of the woods at Creve Couer in two weeks. Ever seen a blown alcohol boat run 175 mph? Come on over. I`ll put you to work.

11-01-2006	#11
ffvetteman Join Date: Jan 2005 Location: New Berlin WI Posts: 247	Re: mailed radio for repair today. What is the cdm box? I have not pulled my stereo yet, but I sispect I will be pulling the head unit next year as the CD player does not work. All the speakers work and if you ask me sound very good!! I think the stereo has a great sound for stock.

11-10-2006	#12
tomtom72 Join Date: Dec 2004 Location: Jacksonville, FL USA Posts: 4,645	Re: mailed radio for repair today. Our GM/Bose system is made up of components that are in different locations. The "radio/CD/CA" in the dash is just the place where the tape deck & CD deck and the display functions live, called the head unit or control head unit. I think that there was no room for the rest of what makes the sound system work at that location. CDM box is the rest of the "stuff" ya need to make the head unit actually do something. It houses the "tuner" circuits for the radio as well as the circuits that "read" the signal from the CA tape heads and the signal from the CD "head"(?). There may also be some kind of pre-amp function in that box because it distrubutes the signal to the speakers and has the circuits that adjust the fade, bass & trebble and it may even house the clock function. The last component are the speakers with their individual amps at the four corners. Oh, yea, I forgot the wiring! In my 90 the CDM is under the glove box....sort of...and just inboard of the fuse panel. That place that Rich was talking about has an excellant "how to" section that covers the locations of various components (they moved over the life of the C4) and a good step by step on how to do the R & R on the stuff. The early Z CDM box R & R will make ya get religion! There is just not that much room to get human sized hands up in there to work. Ya know what it's like with a C4, 15 lbs o' stuff in a 5 lb bag....and it's a jig saw puzzle to boot! There is a ton o wiring in the way and the bracket that holds it is one of those multi-function types that drive ya to swear! Tom __________________ 1990 ZR-1, Black/grey, #2233, stock. ZR-1 Net Reg Founding Member #316 & NCM member

01-27-2008	#14
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,741	Re: mailed radio for repair today. as i said a few days ago i put the system back in my Ruby. next winter i'll send my 90 unit out so i'm curious if your CDM goes IN easier than it came out for you. if it's a b...atch maybe i'll send my 95 out first ha, ha. no, the 90 has to get done sooner or later. i'm lucky only one of my cars has the box in the bad area, could be all three . __________________ There are no limit's mans ingenuity, just as mans ingenuity will never conquer the forces & behavior of this planet...Smokey Y.

05-24-2009	#16
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,741	Re: mailed radio for repair today. Got it out of my 90 last night...wasn't too, too bad. I can see it being a pig to get back in though, for sure . __________________ There are no limit's mans ingenuity, just as mans ingenuity will never conquer the forces & behavior of this planet...Smokey Y.

06-05-2009	#17
flyin ryan Join Date: Aug 2006 Location: Edmonton, Alberta or Phoenix, Arizona Posts: 2,741	Re: mailed radio for repair today. My stereo showed up from Doctor Don's today. Now we'll see how much fun the CDM box is to get back 'IN' the dash of my 90 . __________________ There are no limit's mans ingenuity, just as mans ingenuity will never conquer the forces & behavior of this planet...Smokey Y.

06-05-2009	#18
RICHARD TILL Join Date: Aug 2005 Location: Iuka, Mississippi 38852 Posts: 756	Re: mailed radio for repair today. Better keep a New Testament handy. You might need it when all your blood runs to the top of your head from standing on it.

06-05-2009	#19
GrayZ Join Date: Mar 2006 Location: Innsbrook, Missouri Posts: 1,727	Re: mailed radio for repair today. richard, missed you at bowling green this year, again??? still racing boats?

06-06-2009	#20
RICHARD TILL Join Date: Aug 2005 Location: Iuka, Mississippi 38852 Posts: 756	Re: mailed radio for repair today. Yep, I was racing boats. I really wanted to go to the gathering but was in Poplar Bluff, Mo.. Got a 4th place out of a class of 14. I broke out with a 9.883 and other guy ran a near perfect 10.02 I`ll be up in your neck of the woods at Creve Couer in two weeks. Ever seen a blown alcohol boat run 175 mph? Come on over. I`ll put you to work.