Sony DPS-R7 Reverb DOA

Posted by Scott

My Sony R7 Reverb from eBay came today, dead. I replaced a dead battery tonight but that didn’t clear anything up, still just passing a dry signal and a dead rotary encoder knob. Not sure what the issue is, if anyone knows a good Sony tech let me know, I have the schematics. Also need a good Lexicon tech too.

9 Comments Leave A Comment


Ben says:

April 1, 2009 at 2:08 pm

Do you want someone local? I know someone who could probably manage this, but it’d be another round of shipping.


Scott says:

April 1, 2009 at 2:49 pm

thanks, shipping is fine, just need the stuff fixed. let me know, you can reply here or to —-> talk “@ symbol”


Alan says:

April 2, 2009 at 7:40 am

Even when your taking pictures of your broken gear, I can’t help but attention to the color in lighting in all of your photos :)


Chuck Zwicky says:

April 17, 2009 at 2:56 pm

I pulled my R7 from the rack and powered it up to find a dead encoder wheel and no backlight on the LCD… the battery is fine at 3.0v After much puzzlement I began measuring the many many regulators (A variety of 78xx and 79xx as well as LA5666 ICs…

Check the two 5v regulators, IC 903 and 904… mine were putting out 0.7 and 1.8v… I will be replacing them in two days.


Chuck Zwicky says:

April 17, 2009 at 2:58 pm

PS: I want those Chameleon Labs knobs ( the old grey ones). I see that you have replaced them with the black metal knobs…


urbex says:

October 19, 2009 at 11:09 pm

I have an R7 that’s DOA as well–behaving exactly as Chuck’s after a battery replacement.

Did replacing the two 5v regulators end up fixing the dead encoder/backlight problem?


Neil says:

December 15, 2010 at 9:15 am

Just for anyone who finds this on the internet, I want to say that Chuck’s regulator hunt was exactly what I had to go through.

Interestingly, it was exactly the IC 903 and 904 in mine too which were faulty. Replacing them brought the unit back online, rotary encoder and all.

Thanks Chuck!