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Re: [T3] Hooking up a Sapphire Playtape I


On 9 Feb 2003 at 20:35, Greg Merritt wrote:

> 
>  Ah!  Thanks to all who pointed out the obvious, namely, 
> removing the cover from the radio. :)  I saw this:
> 
> http://home.earthlink.net/~gmerrittsprint01/inside_playtape.jpg
> 
>  The blue wire most definitely powers the dial's lamp.  You 
> can see it snaking down behind the tape drive motor toward the dial.

Okay, blue is the dial lamp. Sometimes this was switched and sometimes not 
(your case.)

>  That leaves black, brown, and brown-with-stripe.

The 2 browns are probably the halves of a zip cord. Either way I'm pretty sure 
that they are for the speaker. It would be common for one of them to be 
grounded.

>  Brown-with-strip is clearly soldered to the chassis -- ground.
> 
>  The black wire goes to the... transformer, is it? there in 
> the upper right corner of the unit as pictured -- the component to 
> the right of the pcb.  Sharing this lead on the transformer is a thin 
> black wire that goes to the power/volume switch, the switch on the 
> right in the picture.  (The radio is upside-down, that is, the cover 
> I removed was from the bottom.)  Also sharing this lead on the 
> transformer is a capacitor that runs to ground.  Is this for noise? 

The "transformer" is probably a choke, which together with the capacitor keeps 
ignition noise out of the radio circuits.

-- 
Jim Adney
jadney@vwtype3.org
Madison, WI 53711-3054
USA


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