[ICOM] IC-781 memory battery

[Larry L. Hinton]

I was just reminded there are TWO lithium batteries in the 781 (both BR2032-1T2). One is on the LOGIC-A board as I originally described below and the other is on the LOGIC-B board. On the LOGIC-B board, the battery + (BT1+) terminal, seen on page 131 of 224, is just to the upper right of the area for the OPTION UNIT UT-36 SPEECH SYNTHESIZER and just above J10.
LarryK7YBZ
       From: Larry L. Hinton <hinton.ll at frontier.com>
 To: ICOM Reflector <icom at mailman.qth.net> 
 Sent: Tuesday, February 3, 2015 3:18 PM
 Subject: Re: [ICOM] IC-781 memory battery
   
The battery is located on the LOGIC-A board. It is a BR2032-1T2 (Sanyo Part Number) but available through Digi-Key under Panasonic (BR2032/F2N). It is a Lithium cell with solder tabs.
You can download the IC-781 service manual here:
The download button is a little obscured but located on the third line below the Document Preview and says "Get Manual".
You can see the parts layout for the appropriate location on the Logic-A on page 130 of 224. The battery (BT1) has two solder locations. The first located just to the bottom left of IC6 (between IC5 and IC6) and the second is just to the upper right of IC6 between D1 and Q8.
Some folks have soldered in a button battery case and insulated it after installing the battery. The PRO's don't recommend that though.
 LarryK7YBZ