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Re: [OM] OM1 wiring

Subject: Re: [OM] OM1 wiring
From: Jay Maynard <jmaynard@xxxxxxxxxxx>
Date: Fri, 13 Nov 1998 02:52:58 -0600
On Wed, Nov 11, 1998 at 04:44:08PM -0500, John Hermanson wrote:
> Early OM-1 production used a white battery wire.  Some were black.  Later
> this became brown, right up to the very last 1N (sigh). The layout of the
> meter board changed several times too.  The wire in question is probably
> the battery wire and should be soldered to the switch contact.

My OM-1 must not be as early as I thought. The pressure plate says October
1974, and it's S/N 314xxx. It has a brown battery wire connected to the
switch. The white wire in question goes to one side of the meter.

Here's where I get lost: The meter has 3 terminals. One, a blue wire, goes
straight into the meter body. The second, a yellow wire, goes to a wiper
contact at the back of the camera, and the white wire goes to a wiper on the
front of the camera. Now, I'm not used to a single meter movement that has
three places to connect stuff. What's going on here?

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