I've been a big fan of the Sherwood RX-410x series of stereo receivers. My own units have proven reliable, but reports of trouble are out there and more frequent than they ought to be. I've wanted to know what goes wrong with these units, so I picked up a broken RX-5502 multi-zone receiver. Its circuitry differs somewhat from the RX-4105 or 4109 series, but the same basic design is used for power and preamplifier circuits. Sherwood claims a total output power (with all speakers going) rating of some 400 watts. They are dreaming! As found, this receiver would just shut down a few seconds after being powered up, followed by a blinking standby LED. Normally this indicates a power amplifier or power transistor fault, yet I did not think such a fault existed here. Watch and see how I did some troubleshooting and arrived at the cause of the problem. I'm not sure it's totally fixed yet, as the new regulator seems to be running awfully hot. I'll have to look into that some more, but it did survive running for several hours tonight. Now all I have to do is find some screws to replace the ones I didn't get with the unit and straighten out the cover a little bit. There are some interesting features that were never realized in this unit. When sold as a TEAC AG-980, this unit gains an optional serial port and some other connections. Sherwood's designer clearly thought about adding support to connect an iPod and support for DAB broadcast decoding. (You can see this in the video ...
Showing posts with label Sherwood. Show all posts
Showing posts with label Sherwood. Show all posts
Kitchen Table Electronics Repair: Sherwood RX-5502 Multi-Zone Stereo Receiver
on Thursday, December 6, 2012
Kitchen Table Electronics Repair: Sherwood RX-5502 Multi-Zone Stereo Receiver Tube. Duration : 13.03 Mins.
I've been a big fan of the Sherwood RX-410x series of stereo receivers. My own units have proven reliable, but reports of trouble are out there and more frequent than they ought to be. I've wanted to know what goes wrong with these units, so I picked up a broken RX-5502 multi-zone receiver. Its circuitry differs somewhat from the RX-4105 or 4109 series, but the same basic design is used for power and preamplifier circuits. Sherwood claims a total output power (with all speakers going) rating of some 400 watts. They are dreaming! As found, this receiver would just shut down a few seconds after being powered up, followed by a blinking standby LED. Normally this indicates a power amplifier or power transistor fault, yet I did not think such a fault existed here. Watch and see how I did some troubleshooting and arrived at the cause of the problem. I'm not sure it's totally fixed yet, as the new regulator seems to be running awfully hot. I'll have to look into that some more, but it did survive running for several hours tonight. Now all I have to do is find some screws to replace the ones I didn't get with the unit and straighten out the cover a little bit. There are some interesting features that were never realized in this unit. When sold as a TEAC AG-980, this unit gains an optional serial port and some other connections. Sherwood's designer clearly thought about adding support to connect an iPod and support for DAB broadcast decoding. (You can see this in the video ...
I've been a big fan of the Sherwood RX-410x series of stereo receivers. My own units have proven reliable, but reports of trouble are out there and more frequent than they ought to be. I've wanted to know what goes wrong with these units, so I picked up a broken RX-5502 multi-zone receiver. Its circuitry differs somewhat from the RX-4105 or 4109 series, but the same basic design is used for power and preamplifier circuits. Sherwood claims a total output power (with all speakers going) rating of some 400 watts. They are dreaming! As found, this receiver would just shut down a few seconds after being powered up, followed by a blinking standby LED. Normally this indicates a power amplifier or power transistor fault, yet I did not think such a fault existed here. Watch and see how I did some troubleshooting and arrived at the cause of the problem. I'm not sure it's totally fixed yet, as the new regulator seems to be running awfully hot. I'll have to look into that some more, but it did survive running for several hours tonight. Now all I have to do is find some screws to replace the ones I didn't get with the unit and straighten out the cover a little bit. There are some interesting features that were never realized in this unit. When sold as a TEAC AG-980, this unit gains an optional serial port and some other connections. Sherwood's designer clearly thought about adding support to connect an iPod and support for DAB broadcast decoding. (You can see this in the video ...
An Unexpected Bargain: The Sherwood RX-4109 Stereo Receiver
on Wednesday, October 3, 2012
An Unexpected Bargain: The Sherwood RX-4109 Stereo Receiver Video Clips. Duration : 10.15 Mins.
If you are considering the purchase of a modern stereo receiver, here is one you really ought to look at. The Sherwood RX-4109 (or the recently discontinued Best Buy Insignia NS-R2000) stereo receiver is a heck of a deal for the money (less than 0 USD as of this writing). Although its power ratings are bit optimistic, this receiver still manages to put out some pretty good sound. It may be a little soft in the bass department, but the dimmable/blankable display, numerous inputs, decent remote control, dedicated phono input and strong power supply (complete with nice 'n heavy transformer) make this a receiver worthy of a long and hard look if you're in the market for a stereo receiver. I would say it compares very well to even much more expensive offerings. Both of mine came from eBay. One was new in the box.This one was said to be "broken". If there is anything wrong with this design, it would be the stingy heatsink that Sherwood chose to use for cooling the final power transistors. And an RDS decoder would have been nice, to make use of the fully alphanumeric display. (There's a plug in for this card on the main board, as the European versions of the RX-4109 have an RDS decoder.) Sherwood has a tremendous OEM business and a long history. They are making many of Pioneer's current-day stereo receivers, as well as those of others. And, perhaps rather amazingly, I did get service literature for this unit out of them after some bothering and asking. The RX-4105 receiver is ...
If you are considering the purchase of a modern stereo receiver, here is one you really ought to look at. The Sherwood RX-4109 (or the recently discontinued Best Buy Insignia NS-R2000) stereo receiver is a heck of a deal for the money (less than 0 USD as of this writing). Although its power ratings are bit optimistic, this receiver still manages to put out some pretty good sound. It may be a little soft in the bass department, but the dimmable/blankable display, numerous inputs, decent remote control, dedicated phono input and strong power supply (complete with nice 'n heavy transformer) make this a receiver worthy of a long and hard look if you're in the market for a stereo receiver. I would say it compares very well to even much more expensive offerings. Both of mine came from eBay. One was new in the box.This one was said to be "broken". If there is anything wrong with this design, it would be the stingy heatsink that Sherwood chose to use for cooling the final power transistors. And an RDS decoder would have been nice, to make use of the fully alphanumeric display. (There's a plug in for this card on the main board, as the European versions of the RX-4109 have an RDS decoder.) Sherwood has a tremendous OEM business and a long history. They are making many of Pioneer's current-day stereo receivers, as well as those of others. And, perhaps rather amazingly, I did get service literature for this unit out of them after some bothering and asking. The RX-4105 receiver is ...
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