Bridge Rectifier question

hotscot · 14th January 2006, 02:51 AM

The Bridge Rectifier in the power supply of my Marantz amp is physically damaged. It's a square shaped part from Shindengen, 200V, 4 amp.

Could someone with more knowledge than me tell me if I have to replace it with the exact same value? I see for example that Radio Shack have a 200V 6 amp rectifier. I just want to put something in the circuit to see if it will work.

Regards
Alan

poobah · 14th January 2006, 02:54 AM

You're fine, and thinking correctly.

You do have to ask yourself though... why did the rectifier blow? You might want to probe around on the rails and look for more shorts/failed comps...

hotscot · 14th January 2006, 03:02 AM

Well...I'm embarrassed to say that at one time I took the two large caps out of the board and then replaced them..don't ask...and at that time I knew nothing about polarisation. So if I had them in the wrong way could that have damaged the rectifier?
I'm taking baby steps here

Schematic attached.

Regards
Alan

Christer · 14th January 2006, 03:04 AM

Did you replace the caps with larger ones (ie. more uF)? In that case you get higher charge currents and may need a bridge with higher rating.

hotscot · 14th January 2006, 03:05 AM

If I'm going to stay bitten by this bug are there any straightforward guides on how to test individual components. I understand I'd need a meter.

Alan

poobah · 14th January 2006, 03:08 AM

Well,

I won't ask then... you are on the right track. I know the bigger caps opened up your soundstage and gave you fast bass.............................................. .................................................. ...........................

poobah · 14th January 2006, 03:09 AM

Fess up,

Tell us what you did to the caps...

hotscot · 14th January 2006, 04:01 AM

Good question...

I replaced 12000uF 56 V caps with 10000 63 V Caps.

Should I adjust the Bridge Rectifier..I was going to use a 200V 6 Amp from RadioShack.

hotscot · 14th January 2006, 04:03 AM

About how I messed up. I'm not an electronics person..this is all new to me...but with all your help I'm learning fast

And I'm grateful.

Christer · 14th January 2006, 04:06 AM

Well, since you replaced with smaller caps, that is probably not the reason, although it could be if they are better (lower ESR) and the bridge was designed on the limit. However, that is probably not the cause of the fault in this case.

14th January 2006, 02:51 AM	#1
hotscot diyAudio Member Join Date: Aug 2004 Location: California	Bridge Rectifier question The Bridge Rectifier in the power supply of my Marantz amp is physically damaged. It's a square shaped part from Shindengen, 200V, 4 amp. Could someone with more knowledge than me tell me if I have to replace it with the exact same value? I see for example that Radio Shack have a 200V 6 amp rectifier. I just want to put something in the circuit to see if it will work. Regards Alan

14th January 2006, 03:05 AM	#5
hotscot diyAudio Member Join Date: Aug 2004 Location: California	In fact... If I'm going to stay bitten by this bug are there any straightforward guides on how to test individual components. I understand I'd need a meter. Alan

14th January 2006, 04:01 AM	#8
hotscot diyAudio Member Join Date: Aug 2004 Location: California	Different values Good question... I replaced 12000uF 56 V caps with 10000 63 V Caps. Should I adjust the Bridge Rectifier..I was going to use a 200V 6 Amp from RadioShack.

14th January 2006, 04:03 AM	#9
hotscot diyAudio Member Join Date: Aug 2004 Location: California	See reply a few posts back.. About how I messed up. I'm not an electronics person..this is all new to me...but with all your help I'm learning fast And I'm grateful.

Thread Tools	Search this Thread
Show Printable Version Email this Page	Search this Thread: Advanced Search


	Please consider donating to help us continue to serve you. Ads on/off / Custom Title / More PMs / More album space / Advanced printing & mass image saving

14th January 2006, 02:54 AM	#2
poobah diyAudio Member Join Date: Nov 2005	You're fine, and thinking correctly. You do have to ask yourself though... why did the rectifier blow? You might want to probe around on the rails and look for more shorts/failed comps...

14th January 2006, 03:04 AM	#4
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	Did you replace the caps with larger ones (ie. more uF)? In that case you get higher charge currents and may need a bridge with higher rating.

14th January 2006, 03:08 AM	#6
poobah diyAudio Member Join Date: Nov 2005	Well, I won't ask then... you are on the right track. I know the bigger caps opened up your soundstage and gave you fast bass.............................................. .................................................. ...........................

14th January 2006, 03:09 AM	#7
poobah diyAudio Member Join Date: Nov 2005	Fess up, Tell us what you did to the caps...

14th January 2006, 04:06 AM	#10
Christer diyAudio Member Join Date: Sep 2002 Location: Sweden	Well, since you replaced with smaller caps, that is probably not the reason, although it could be if they are better (lower ESR) and the bridge was designed on the limit. However, that is probably not the cause of the fault in this case.

Similar Threads
Thread	Thread Starter	Forum	Replies	Last Post
Bridge rectifier voltage question	woody	Power Supplies	1	1st May 2008 12:47 AM
bridge rectifier question	crippledchicken	Power Supplies	31	25th April 2008 11:17 AM
Bridge Rectifier Question	sam9	Solid State	3	16th October 2004 01:03 AM
Simple bridge rectifier question.	JoeBob	Everything Else	51	15th February 2002 07:46 PM

New To Site?	Need Help?
Register to Participate Search Privacy Statement Contact Us	Frequently Asked Questions Did you forget your password? Mark Forums Read