 Re: My Rotel RB-1080 lest channel died
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Joined: May 2003
Posts: 18,044
shareholder in the making
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shareholder in the making
Joined: May 2003
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Indeed. It must be nice not to have to worry about fast transients, surges and ring waves on I/O in audio. Then you can get away with a pseudo star ground.
As an audiophile, I take this as Rotel cutting corners and removing the musicality of ring waves.
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Re: My Rotel RB-1080 lest channel died
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Joined: Jul 2004
Posts: 4,444 Likes: 16
connoisseur
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OP
connoisseur
Joined: Jul 2004
Posts: 4,444 Likes: 16 |
Michael, can you take a close-up of one of those blue capacitors (the big cylinders) on the amp board? In your second photo it looks like there is some black stuff where it meets the PCB. Rotel, or more likely their 3rd party manufacturer, used a corrosive glue under these capacitors which will leech out over time and start to damage the parts around them. The blown fuse might suggest that some corrective action is required.
Thanks for looking Andrew. Here are a few more pics. All the blue capacitors appear to have some black substance around the base. Not sure if I'd say it was leaching though. More like, just glue??   
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Re: My Rotel RB-1080 lest channel died
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Joined: May 2014
Posts: 1,171 Likes: 6
connoisseur
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connoisseur
Joined: May 2014
Posts: 1,171 Likes: 6 |
On that first new photo, the black goop is right ontop of the resister to it's right. I would make sure it's not about to take that out.
Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5
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Re: My Rotel RB-1080 lest channel died
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Joined: Jan 2007
Posts: 10,490 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,490 Likes: 116 |
Michael, can you take a close-up of one of those blue capacitors (the big cylinders) on the amp board? In your second photo it looks like there is some black stuff where it meets the PCB. Rotel, or more likely their 3rd party manufacturer, used a corrosive glue under these capacitors which will leech out over time and start to damage the parts around them. The blown fuse might suggest that some corrective action is required.
Thanks for looking Andrew. Here are a few more pics. All the blue capacitors appear to have some black substance around the base. Not sure if I'd say it was leaching though. More like, just glue?? I don't see any bulging on those caps. Looks like silicone rubber to me for shock and vibration withstand.
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Re: My Rotel RB-1080 lest channel died
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Joined: Jan 2007
Posts: 10,490 Likes: 116
shareholder in the making
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shareholder in the making
Joined: Jan 2007
Posts: 10,490 Likes: 116 |
Indeed. It must be nice not to have to worry about fast transients, surges and ring waves on I/O in audio. Then you can get away with a pseudo star ground.
As an audiophile, I take this as Rotel cutting corners and removing the musicality of ring waves. Yes, Ken. Ring waves are indeed very musical. If you were connected to a ring wave generator, the Violent Femmes could use you as the protagonist on this Oedipal tune. https://youtu.be/BUI5GlvEk7Y?t=3m3s
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Re: My Rotel RB-1080 lest channel died
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Joined: Mar 2014
Posts: 1,593 Likes: 1
connoisseur
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connoisseur
Joined: Mar 2014
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Wierd with all that heatsinking all the way around there appears to be only one output transistor per channel. The guts of that rotel are a thing to behold!! Real parts instead of icbs. The guts of the arcam integrated I sold looked like a computer video card.... I love tanky electronics.
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Re: My Rotel RB-1080 lest channel died
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Joined: Jul 2004
Posts: 4,444 Likes: 16
connoisseur
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OP
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Joined: Jul 2004
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So after looking at the capacitor above the blown fuse a bit closer, and comparing it to the other three, it looks and feels like it's bulged. I can also wiggle it a bit, and the others are firm.
I did find some fuses, but I suspect that if I hook this thing up and test it, the fuse will probably just blow again.
How are these things attached to the board? I'm hesitant to start pulling on it.
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Re: My Rotel RB-1080 lest channel died
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Joined: May 2014
Posts: 1,171 Likes: 6
connoisseur
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Joined: May 2014
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if the three are the same, and one of them has gone, then I would tend to look into replacing all of them at the same time. Nothing worse than fixing something to have it fail in 3-6 months with the same problem.
Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5
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Re: My Rotel RB-1080 lest channel died
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Joined: Jul 2004
Posts: 4,444 Likes: 16
connoisseur
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OP
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Joined: Jul 2004
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I agree (also replaced all four fuses).... Need to figure out how to perform that repair though.
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Re: My Rotel RB-1080 lest channel died
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Joined: May 2014
Posts: 1,171 Likes: 6
connoisseur
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connoisseur
Joined: May 2014
Posts: 1,171 Likes: 6 |
You will need to remove the circuit boards from the unit to get to the back of them. You'll need a solder sucker and some wicking wire and remove the solder from the two leads on the back. you might need to wick with the wire to get the solder that is on the front side too. https://www.youtube.com/watch?v=YCSNWi3UHf4Now with this board you have the second hard part in they also glued them on. So you need to see about how to get the glue off as well. I'd wait to see if Andrew has some great methods as that is likely something that he has done many more times than I.
Anthem: AVM60, Fosi DAC-Q5
Axiom: ADA1500, LFR1100 Actiive, QS8, EP500, M3, M3comp, M5
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