[GreenKeys] Selector magnet question

[John, W9DDD]

Actually they are in series.  Not what it was supposed to be.  4196WD 
applies to this printer.  It shows the selector magnets wired in 
parallel and connected to a 35 pin male connector through a shielded 
twisted pair of wires.  Since the cable coming off the 35 pin female 
connector had only one shielded pair (matching that coming off the 
selector magnets), I blindly connected them to a 60ma loop.  Printer 
seemed to print fine, but I'm not running it full time yet since I 
haven't finished cleaning and lubing it.

Lesson, never assume factory default configuration.

I was looking at it in terms of what it would take to put the standard 
21 pin connector.  That's when I noticed it wasn't wired as shown on the 
WD.  So I had been running 60ma through them as a series connection. 
Just to confirm the connection, I put on ohm meter on it and got 1500 or 
so reading.  I kept doubting the ohm meter, but finally determined the 
individual coils read as noted by fully disconnecting them.

Looking for corrosion will be my next adventure as soon as the company 
head out to the mall.  If that isn't it I'm hoping someone has a junker 
they're willing to take coils from.  Not sure why the parts book says to 
replace in pairs for the old design (which these are).



John, W9DDD

On 1/1/2019 1:08 PM, Duncan Brown wrote:
> Are the coils in series or parallel? If parallel, the 135 ohm coil is 
> doing all the work!
> 
> The 1480 ohm reading is strange. Perhaps corrosion on a terminal or the 
> coil wire is causing the increased resistance? (ie, it is on its way to 
> becoming open)
> 
> Good luck & Happy New Year
> 
> Duncan
> K2OEQ
> 
> On 1/1/2019 12:52, John, W9DDD wrote:
>> How can one of the two coils measure 1480 ohms and the other the 
>> nominal 135 ohms?
>>
>> I can image a case of it being open, or shorted, but 1480 makes no 
>> sense to this old head.
>>
>> Strange thing is I've been copying ITTY off an on as I'm testing 
>> various parts of my set up.
>>
>>
> 
> 
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