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Conference terri::cars_uk

Title:Cars in the UK
Notice:Please read new conference charter 1.70
Moderator:COMICS::SHELLEYELD
Created:Sun Mar 06 1994
Last Modified:Fri Jun 06 1997
Last Successful Update:Fri Jun 06 1997
Number of topics:2584
Total number of notes:63384

1502.0. "Memory power for a car radio" by IDEFIX::GEOFF (Once more unto the beach, dear friends!) Mon Jul 15 1991 18:34

I've fitted a Philips car radio into my Renault 18 and am continually losing
the four memorized station programs.  I know little about electronics but I
know that the radio does not have batteries to preserve the programs and
uses a secondary wire to do this.  This allows the radio to go off when the
ignition key is removed, yet still provides power enough to keep it
programmed.

The real problem is where to plug this wire?  I tried several of the
"battery power" cables, even the clock, all to no avail.  The strange thing
is that even when the cable is not plugged, programs are preserved for a
short while (�hr-1hr).

Any help appreciated.  Thanks & Regards,  Geoff.
T.RTitleUserPersonal
Name
DateLines
1502.1A long shot...NEWOA::MACMILLANSo many V****s, so little timeMon Jul 15 1991 18:484
    Are there any in-line or other fuses that could be blown, or other
    connections that could be duff?
    
    Rob
1502.2memory problemsVIVIAN::M_ELLAWAYTue Jul 16 1991 10:0010
    Connecting it to the clock should be fine just to preserve memory but
    make sure you actually connect it to the clock itself and not the
    illuminating bulbs or back light, the only way to do this is check it
    with a meter to make sure the voltage stays there when you take the
    keys out, other than that use a 12 volt bulb attach a couple of wires
    and put one end to earth and one end on the wire and then see if you
    get anything, If all this is ok it looks like you have a problem with
    your radio.
    
    Good Luck Martin
1502.3clean and verify all connectionsUKCSSE::ARBISERIf you want it done, or even done well - DIYThu Jul 18 1991 09:4525
    
    Question is how are you connecting the extra power cable up? If you're
    using the plastic clip type which effectively bridge across to pieces
    of wire, then enusre the metal inserts are indeed cutting into the
    wires' plastic outer. I have found these type of connectors quite hard
    to use and have often had to resort to using a blade first to cut into
    the outer.
    
    My radio, which is removeable, does emply batteries. The first time I
    fitted those I had exactly the same symptoms you describe. It wasn't
    until I thouroughly cleaned the batter terminals and contacts that I
    got it to work.
    
    By the way, you should also check the other, primary, power connection.
    If that is not working or even not 100% secure, it means that your
    secondary connection is doing all the running of the radio when the
    ignition is off. I know the radio chould possibly then work without the
    key but it might not!
    
    Good luck and keep at it
    
    Ian
    
    
    
1502.4Should use a piggyback spade connector here if poss.KETJE::SHASTA::RUTTERRut The NutThu Jul 18 1991 12:175
�    using the plastic clip type which effectively bridge across to pieces
    
    Aaaaaaggghh  !!!     The dreaded Scotchlok's again
    
    J.R.