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Re: [OM] Re: Battery testing [was "OMPC/OM-2S Auto Shutter Problem"]

Subject: Re: [OM] Re: Battery testing [was "OMPC/OM-2S Auto Shutter Problem"]
From: HI100@xxxxxxx
Date: Mon, 14 Jun 1999 07:43:02 EDT
Joel,
        according to the OM2S service information that I have, (not the 
official factory manual) the internal camera battery test takes place at 8mA 
(with beeper active). 
        The lamp draw is 7mA. So a more severe field test on an OM2S would be 
to activate LCD light along with battery test, assuming controller does not 
switch off light during battery test.   
        Interestingly the regular OM2 service manual battery test circuit 
shows a current draw more like 18mA (80 Ohm in series with transistor switch 
and LED.)

        Special battery test positions on a DVM or a battery test meter  may 
not be set up to simulate the normal loading of small silver oxide cells. 
They are more likely to be set up for Alkaline cells at 1.5V and draw too 
large a current. 

        According to Eveready a typical loading for which the 357 cell is 
designed is about 2mA continuous. They only guarantee greater than 1.3V at 
100 Ohm for a few seconds. (ie. 13mA at 1.3V)  In the OM cameras the shutter 
solenoids draw considerably more than 2mA during shutter operation.

        Something that often happens when cells have been in the camera a 
while is an oxide film seems to develop on the nickel plating.  Wiping the 
surfaces of the cells vigorously with a rough cloth or scraping them often 
brings them back to life and is also worth doing when first installing new 
cells.
        Hope this helps.

Tim Hughes
Hi100@xxxxxxx

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