- Sherwood RD-6108 receiver turns on and off randomly. - 2 Updates
- Blown Electros - 3 Updates
| Chuck <ch@dejanews.net>: Sep 17 10:02AM -0500 I don't have a service manual for this receiver but I checked the 6V standby voltage and the 15V line from the standby power supply and they both are at the correct voltage and have low ripple. I've heated and cooled the boards with no change of symptoms. The problem began by the receiver turning on in the middle of the night. Reset the micro but it happened again 2 hours later. Now it clicks off when on from anywhere from 2 seconds to hours. Is there a common fault for this receiver causing these symptoms? Thanks. Chuck |
| "pfjw@aol.com" <peterwieck33@gmail.com>: Sep 17 08:30AM -0700 On Monday, September 17, 2018 at 11:02:07 AM UTC-4, Chuck wrote: > but it happened again 2 hours later. Now it clicks off when on from > anywhere from 2 seconds to hours. Is there a common fault for this > receiver causing these symptoms? Thanks. Chuck Silly suggestion - does a piece of black tape over the IR sensor help at all? I suggest because I am seeing lots of "smart house" stuff starting to interfere with some legacy equipment out there. You might also isolate the remote as some of the touch-pad contacts may be aging and making random contact. That is to get past the obvious. Otherwise, I would trace out the on/off circuit and look for a bad capacitor on in that lot. This unit is approaching 18 years old, or so, about the time these tiny little electrolytics start to fail. Best of luck with it! |
| Cursitor Doom <curd@notformail.com>: Sep 17 12:20AM Has anyone ever had a large electrolytic cap (like in a PSU) fail, pouring out acrid smoke that fills the room but leaves no other evidence whatsoever of it having failed (like no staining on the PCB or even the cap itself - and no bulges either)? -- This message may be freely reproduced without limit or charge only via the Usenet protocol. Reproduction in whole or part through other protocols, whether for profit or not, is conditional upon a charge of GBP10.00 per reproduction. Publication in this manner via non-Usenet protocols constitutes acceptance of this condition. |
| Sjouke Burry <burrynulnulfour@ppllaanneett.nnll>: Sep 17 05:30AM +0200 On 17-9-2018 2:20, Cursitor Doom wrote: > pouring out acrid smoke that fills the room but leaves no other evidence > whatsoever of it having failed (like no staining on the PCB or even the > cap itself - and no bulges either)? Yeah... Four 300v (2 serial/parallel) in a powersupply for 500 volt out. Reverse connected. Exploded after about 10 seconds. |
| "pfjw@aol.com" <peterwieck33@gmail.com>: Sep 17 04:35AM -0700 Sure. I will not suggest that it happens "all the time", but I have had a couple of big, honking (5,000uf @ 80V) coupling caps go off like Roman candles, leaving no other marks and giving no warning. These things had little rubber plugs on top - and the only visible evidence after the show was that the plug was missing. Made in Scotland, as it happens. Peter Wieck Melrose Park, PA |
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