Yamaha DX7 IID Repair (Battery Replacement)

Today's project is replacing an old soldered in battery with a new one that can be easily replaced in the future.
In this video, I show you how to open it up, where to find the battery, how to replace it, how to put it all back together, and then share some other helpful information
Time stamps for the different steps are listed below
0:26 - First Boot up
0:42 - Removing the Bottom Panel
1:04 - First Look Inside
1:08 - Board Identification
1:25 - Removing Screws from Back
1:40 - Removing the DM Board
2:06 - DM Board Wiring
2:29 - Disconnecting the DM Board
2:46 - Desolding Old Battery
3:03 - Modifying Battery Holder
7:10 - Installing New Battery
8:03 - Reinstall DM Board
9:12 - Attaching Battery to Chassis
9:23 - Initializing
10:15 - Turning Local On
11:12 - Finish Reassembling
11:58 - Cleaning
Once completing the battery, patches/presets will need to me reinstalled. Next week (Feb 14th 2024), another video will go up with instruction on how to program a DX7 II. A link will be posted here when it is up
How to load patches on Windows: • How To Program a Yamah...

[@CRITTERBUSTERS]

I recently got my DX7II battery changed, the no sound part freaked me out. I thought there was something wrong with it. It took me an hour of troubleshooting and menu diving to figure it out. The Local On/Off was the last thing I tried because I had no idea what it was lol

[@deltamumusic]

Haha yeah I though I broke mine some how and freaked out a bit as well. Luckily DX7s are pretty popular, so there is a lot of information out there. Still took me a while to figure it out, but I was so relieved so find out it was something as simple as that

[@tecladistadelrancho7276]

I have changed the battery for a new one but it still leaves me the message. "CHANGE BATTERY" even though the presets are preserved, that message keeps appearing and I don't know how to eliminate it. Thank you, I hope to have your help.

[@deltamumusic]

I have not delt with a problem like this before so I can't provide much help. But I would start with testing voltage across the battery (with the test on the unit itself and also with a multimeter with the unit off and unplugged). Best case the "new" battery is faulty and just need to be replaced. Batteries do have a chance of showing up DOA or hopefully in your case, lacking enough charge to clear the message but enough to store the patches