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24.27.41.140
In Reply to: RE: Denon DRA-700 Backup battery posted by Roypercy on April 17, 2024 at 18:18:45
Are you sure this is a DRA-700. One of the photos you posted includes a small inline IC labeled IC505. However, the DRA-700 manual that I located online shows IC505 to be a three-terminal device attached to a heatsink. The manual is for the Europe and U.K. models, but I wouldn't have though there would be so much difference. What is the complete model number on the rear ID plate on yours?
Follow Ups:
Yup, DRA-700.
That's interesting. The manual I found is for the DRA-700AE, DRA-700AEDAB and DRA-500AE. I spent over an hour searching the schematics and parts lists for a supercap, a battery, or anything similar. Nothing. After you posted those photos, I looked again and did some keyword searching. Some of the parts that are clearly labeled in your photos don't even exist. I also found an inside view of a DRA-700 like yours online. The image isn't sufficient resolution to zoom in too much, but I can tell the board is the same as yours, and I can kinda make out the battery near the edge of the PCB. The Main PWB in the manual I found is very different, so I guess the Europe version is a different animal, and the entire effort was just a waste of time. I'd like to tell you how to handle the battery issue, but I guess it's not possible without the right manual. Personally, if it was mine, I'd be willing to spend $20 or $25 on a manual, just to be sure I installed the correct one. Maybe something to consider. Sorry I couldn't be more help.
Edits: 04/17/24 04/18/24
Hey, no problem and I really appreciate you looking. It's confusing - I went through the same process trying to find a service manual for free online. Denon re-used the model number around 2012, adding an AE at the end, for an A/V receiver, which is what pops up on most web searches.
The DRA-700 I have is not very well documented online as far as I can tell. What's even more confusing, apparently the DRA-600 from the same series as mine does use a capacitor-style battery. As does the DRA-750, the next incarnation of the model I have. So, apparently the button cell was a one-off for this particular receiver. I've ordered a button cell battery holder that I'll solder in place here, so replacing the battery won't be such a hassle in the future.
"I've ordered a button cell battery holder that I'll solder in place here, so replacing the battery won't be such a hassle in the future."
Funny, I did that last year for my lawn sprinkler system. The battery cell was soldered to the board, and the manufacturer wouldn't even answer my emails. I robbed a holder from an old PC motherboard and fixed it right up. Happy listening!
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