Question about Sherwood Audio Players & Recorders
Hey all, I have a Sherwood RD-6502 Reciever. Was working fine until recently, after turning unit on, it will stay on for 2-3 seconds before turning off and the standby light comming on. The standby light remains on. Have tried disconnecting all speakers etc from unit and powering up again with same problem. Have also checked for blown fuses without any luck. Any help appreciated! Kieran My amp does the same thing. Switches off after a couple of seconds when cold. Works fine with no speaker connected. Works fine after it's warmed up a bit but will trip if the volume is loud.
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Posted on Jan 02, 2017
Hi There DEKCAT
Its very unusual for both channels to blow......
I suspect that there is a blown power fuse inside the case......
There are fuses sometime located on the outside rear of the case and these can be easily checked to determine if they are blown..If you find one is blown please replace with the corrrect rated fuse,..... its current rating wil be on a small label on the case outside rear. like 1.0amp, or 1.5amp etc...
If you need to go inside the case please ensure the power plug is removed from the wall socket first.
You will find small glass fuses in the DC power supply feeds and probably one of these has blown, once again replace with the correct rated fuse.
Im not sure if your amplifier is a FET type or a large 32-40 pin IC type as if these are blown you will need a service person to do the replacement...
Please note there is a small relay that clicks 20seconds after turn on at the switch....if this click is not happening then there is problems with the timer circuit or the relay itself...
This relay controls the output to the speakers and as such stops all the sound output if its not working...so the first thing is to check all fuses, if they are OK then check the Relay operations....
Cheers From YUBEUT
Posted on Nov 16, 2007
I had the same problem. The screws around the perimeter of the back plate must be unscrewed and the plate must be pried off as it is glued to the box. When replacing my fuse, 2A 5x20 GMA, it blew the fuse again. Disconnecting the second circuit board prevented the next fuse from blowing, but now the question is what is wrong with the circuit board? I cannot see any damage or shorts.
Posted on Feb 22, 2008
SOURCE: My Sherwood RD6405 Switches on
Try a hard reset first. switch the amp off overnight and try it in the morning. If problems persist, is it covered with warranty from where you bought it? Best to go that route if it is. If not, get back to me here.
Posted on Mar 19, 2008
Oh dear, your budding lil electrician may have gotten out of his depth:).
Shorted speaker wires often result in damage to the amps output stages. The blinking light tells us that the unit has gone into protection mode, preventing damage to the speakers from the amp. It will have what is termed a DC offset condition being generated by the channel; that got shorted. There is no easy fix for this and you have checked the obvious with fuses and removing all speaker wires and checking operation. The unit will have a blown output transistor/array, possibly driver transistors, and fusible resistors, and diodes to that channel. The bias current will also need to be set up again once repairs are completed.
There are no user serviceable parts in a unit like this. With good knowledge of electronics, a multi meter, soldering iron and experience at using all, you could fault find the channel, replace the parts yourself. I should warn you that if descrete components are used, they can be difficult to repair because of the nature of DC coupled linear stages employed. The best option is to take it to a repair man for a quote.
I am happy to try and talk someone through a repair process, but there is a degree of difficulty ascociated with not being able actually work on the amp.
The best solution for you is to get a tech to look at it. This sort of repair work can range from $80-150 depending on the parts used and the time taken to fault find and replace parts. I hope that this helps you. Your appreciation for my time spent to give you this advice is best rewarded with a FixYa.
Posted on Sep 10, 2008
SOURCE: I have a Denon AVR1603,
The LED flash indicates that
unit goes into protection. Check the power transistors, the 0.22 ohm or 0.47 resistors in the output of the transistors.
Posted on Sep 30, 2008
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