I think those fader "swithces" are just variable resistors/potentiometer
things. put a meter on it and see what it does.
Newer head units (I don't mean Beckers -- no idea what they have -- but
any other thing you buy) have the fader built in so you can just bypass
it and use the "native" function.
Again, I don't know about Beckers but I was looking at the schematic for
the radio in my truck, which I liberated from the 2000 Suburban when I
put a new unit in there. I want to put an aux input for an ipod or a
bluetooth module, and the way to do that is to tap into the cassette
line. The unit itself has a remote cassette player that uses that line
so just a matter of putting the wires and a mini-plug socket somewhere
near the unit. Of course this is on my "to-do" list... Some people
have found success by just opening up the unit and looking at the board
or inputs and just tapping/splicing into the proper wire or trace or
plug or something on the main board -- apparently most of them are
annotated on the boards or it is easy enough to see what goes where.
--R
On 6/19/15 7:53 AM, Meade Dillon via Mercedes wrote:
Dan,
Thanks for that info on the CD changer port. I've got a couple of old CD
changers, not sure if either works, maybe I can enlist Rich to figure out
what the CD changer is saying to the radio to make the CD input active.
I have seen a couple of "hacks" to solder the aux cables to the cassette
tape board, that doesn't look too bad. One hack required that a gutted
tape be inserted in the tape player to make the tape input active, but I
wonder if the radio would then count down the 30 hours and then call for
the head cleaning.
I still need to decide how to tackle the fader switch. Perhaps the only
redeeming feature of the so-called "installation" job done to the car
earlier is that they didn't mess with the fader switch and wiring.
If I keep the fader switch, do I only feed it the front speaker signals
from the 1492, or should I combine the front and rear signals (more power)
to feed the fader? My gut tells me that combining the signals is a bad
idea, so if no one can answer that I'll probably only feed either the front
or the rear signals to the fader.
-------------
Max
Charleston SC
On Fri, Jun 19, 2015 at 5:40 AM, Dan Penoff via Mercedes <
mercedes@okiebenz.com> wrote:
Max,
In researching possible mods to the 1492s in my W140 chassis cars, I
looked at the CD changer inputs and determined that they cannot be used for
auxiliary inputs. This is due to the need for a signal to be coming back
from the changer for the changer input to be active. It’s not something
you can “fake”, either.
I believe the Becker folks do it by connecting to the tape head on the
cassette player section in order to get it to work.
Dan
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