Help needed with messed-up Marantz SR-52

Spasticteapot · 18th March 2006, 05:33 AM

To make a long story short, I've got a messed-up Marantz SR-52 integrated amplifier/reciever. When I try to power it on, it blows its fuse, and only partially lights up for a fraction of a second.
From what I've heard, the bridge rectifier might be at fault. After testing it at a ridiculously low load, it does (sort of) seem to work; however, the bridge (it's a S4VB with a 20 printed on the left and a 17 on the right; I believe that this is a 200v @ 4A bridge, correct me if I'm wrong).
Now, here's my questions.
1. Can I get away with replacing this with a piece-of-junk rectifier from RadioShack? I imagine that I can get one for at least 6A at 200V.
2. Does this sound like a blown power amplifier to you? (If so, should I just scrap it?)
2. What else might be causing this problem?
3. Can anyone find schematics on this amp? It appears to not even exist!
Thanks,
Joe.

anatech · 18th March 2006, 11:26 PM

Hi Joe,
Sounds like blown outputs. It's repairable without a diagram by a good technician.

Unplug the unit. Avoid Radio Shack. Test parts first. Order new from Mouser or Digikey (where ever the parts are stocked).

Find the emitter resistors. Measure from the center of each to both the plus and minus of each main supply capacitor. The low resistance reading(s) indicate the defective channel.

-Chris

18th March 2006, 05:33 AM	#1
Spasticteapot diyAudio Member Join Date: Jan 2006 Location: Wisconsin....what did you expect?	Help needed with messed-up Marantz SR-52 To make a long story short, I've got a messed-up Marantz SR-52 integrated amplifier/reciever. When I try to power it on, it blows its fuse, and only partially lights up for a fraction of a second. From what I've heard, the bridge rectifier might be at fault. After testing it at a ridiculously low load, it does (sort of) seem to work; however, the bridge (it's a S4VB with a 20 printed on the left and a 17 on the right; I believe that this is a 200v @ 4A bridge, correct me if I'm wrong). Now, here's my questions. 1. Can I get away with replacing this with a piece-of-junk rectifier from RadioShack? I imagine that I can get one for at least 6A at 200V. 2. Does this sound like a blown power amplifier to you? (If so, should I just scrap it?) 2. What else might be causing this problem? 3. Can anyone find schematics on this amp? It appears to not even exist! Thanks, Joe.

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18th March 2006, 11:26 PM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi Joe, Sounds like blown outputs. It's repairable without a diagram by a good technician. Unplug the unit. Avoid Radio Shack. Test parts first. Order new from Mouser or Digikey (where ever the parts are stocked). Find the emitter resistors. Measure from the center of each to both the plus and minus of each main supply capacitor. The low resistance reading(s) indicate the defective channel. -Chris

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