Taz Posted April 5, 2016 Share Posted April 5, 2016 A couple years are so I was running a 9090DB at 11-1200 on the volume. Speaker output wires for left channel shorted ( + to - ) and left Khorn quit singing. Dang, hooked up another receiver and set the db aside. Sent it in to be restored. Left speaker worked when it arrived after shipping. Anyone have any Ideas what may have happened? Should I have the output transistors replaced just in case? Any thoughts? Quote Link to comment Share on other sites More sharing options...
jason str Posted April 5, 2016 Share Posted April 5, 2016 Check your fuses first. Cycle all your front panel stuff a few times as well, may just be dirty contacts. Easy stuff first before you get into replacing components. 1 Quote Link to comment Share on other sites More sharing options...
Taz Posted April 5, 2016 Author Share Posted April 5, 2016 Check your fuses first. Cycle all your front panel stuff a few times as well, may just be dirty contacts. Easy stuff first before you get into replacing components. Checked the fuses and they were fine. I did not however power it up again. I've already shipped it. Will have other work done also (LED lights) and ???? 1 Quote Link to comment Share on other sites More sharing options...
paul79 Posted April 16, 2016 Share Posted April 16, 2016 The 9090DB has fuse resistors on the amp boards that like to open up. If they are not all the way open, it could cause intermittent issues. Could be several things causing the channel to not work though: Dirty Relay Dolby Board Pass-throughs Solder connection Dirty controls Quote Link to comment Share on other sites More sharing options...
scalawag Posted April 17, 2016 Share Posted April 17, 2016 (edited) I had pretty much the same issue just last month with my Yam CA-2010 ~ no output from left channel. Amp tech found a defective relay in the volume control circuit that was the cause of the problem. While in there he also replaced some marginal performing resistors, installed some LEDs for the power meters, cleaned all switches and adjusted biases/outputs to specs. And while the amp was in the shop I refinished the cover. All is well now. Hope yours goes ok. ~ Edited April 18, 2016 by scalawag 2 Quote Link to comment Share on other sites More sharing options...
mustang guy Posted April 17, 2016 Share Posted April 17, 2016 Man that's a nice looking unit. Quote Link to comment Share on other sites More sharing options...
NBPK402 Posted April 17, 2016 Share Posted April 17, 2016 I had pretty much the same issue just last month with my Yam CA-2010 ~ no output from left channel. Amp tech found a defective relay in the volume control circuit that was the cause of the problem. While in there he also replaced some marginal performing resistors, installed some LEDs for the power meters, cleaned all switches and adjusted biases/outputs to specs. All is well now. Hope yours goes ok. ~ I remember when I had one...loved it! Quote Link to comment Share on other sites More sharing options...
jacksonbart Posted August 14, 2016 Share Posted August 14, 2016 Sounds like an issue Bill Clinton had 2 Quote Link to comment Share on other sites More sharing options...
mustang guy Posted August 14, 2016 Share Posted August 14, 2016 top notch 1 Quote Link to comment Share on other sites More sharing options...
NBPK402 Posted August 14, 2016 Share Posted August 14, 2016 I had a similar problem on my old MX-A5000 amp... All the channels booted up, but were distorted. I rebooted the amp and this time the audio was there but fell silent slowly over less than a minute. I took it in for service and the repair Tech said all the solder joints needed to be redone as they were all bad. $350 later the amp was returned and worked flawlessly again. Hopefully yours is not bad solder joints! Quote Link to comment Share on other sites More sharing options...
Matthews Posted August 14, 2016 Share Posted August 14, 2016 On 4/17/2016 at 1:02 PM, mustang guy said: Man that's a nice looking unit. +1 Quote Link to comment Share on other sites More sharing options...
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