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Author Topic: Changing battery in a Pennywise CA 21... Glen Rich Film Handler Posts: 55 From: Nedlands, Western Australia Registered: Feb 2002 posted 10-22-2011 07:48 AM                     I've been tasked with changing the back-up battery in a Pennywise CA 21 automation unit, but cannot find the schematics in any of the manuals available. Can someone help with the a) the type/version of battery, (which I've been infrmed is 3.6V lithium), and b) how to change it out? Thanks...  |  IP: Logged Brad Miller Administrator Posts: 17775 From: Plano, TX (36.2 miles NW of Rockwall) Registered: May 99 posted 10-23-2011 01:26 AM                     Is this an eprom based CA21 or a later "capio" model CA21? Eprom based units were soldered in. The capio models pop out of a socket. If you remove the top lid you will see it right in the middle. VERY easy to change.  |  IP: Logged Glen Rich Film Handler Posts: 55 From: Nedlands, Western Australia Registered: Feb 2002 posted 10-23-2011 03:18 AM                     Thanks Brad, much appreciated.  |  IP: Logged Steve Guttag We forgot the crackers Gromit!!! Posts: 12814 From: Annapolis, MD Registered: Dec 1999 posted 10-23-2011 08:25 PM                     As I recall, It is a CR-2032. I changed it with the unit powered ON to prevent loss of programming...never a problem. -Steve  |  IP: Logged Joe Redifer You need a beating today Posts: 12859 From: Denver, Colorado Registered: May 99 posted 10-23-2011 10:57 PM                        Will it lose its programming if powered off while changing the battery? Couldn't it use a charged capacitor as a back up? The programs, time, etc could be saved for a week or two without power (including battery) with such a capacitor. Surely they thought of this...  |  IP: Logged Glen Rich Film Handler Posts: 55 From: Nedlands, Western Australia Registered: Feb 2002 posted 10-23-2011 11:56 PM                     It's the soldered in variety, a Sony EF3 3.6v in one unit and 8Y24 "something chinese" 3.6v in another; which as it happens are not available anywhere in Western Australia. The onsite projectionist is getting in touch with Pennywise to get replacements, which when they arrive I get to go back and switch over. Apparently I have about 2 minutes to change over the battery before all programming is lost, and must be re-done... at this time the units are left on 24/7.  |  IP: Logged

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