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[OM] Re: T32 & T20 "hole" in the "O"

Subject: [OM] Re: T32 & T20 "hole" in the "O"
From: Tim Hughes <timhughes@xxxxxxxx>
Date: Sun, 7 Nov 2004 16:39:19 -0800 (PST)
The LED (flash ready) line is used not only to indicate to the user that flash 
is ready, but also to signal if a quench took place or not (i.e. under exp). 
The current levels through that pin and the sequence of LED flashes tells the 
camera what happend.  A small current always flows through the pin telling the 
camera a flash is present even if it is not ready. A higher current flows 
lighting the LED if flkash is ready. Current to the pin is always interupted at 
flash time followed by pulsing from low to high level if quench occurred.  See 
the OM2N service manual for best description and details. Some third part 
flashes implement this better than others.
Tim Hughes


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