2230 blowing main fuse ???

[HomerJSimpson]

What would cause the main fuse on the 2230 to blow immed???

Bad power switch maybe???

Shorted outputs???

 

[HomerJSimpson]

Outputs tested OK!

 

[HomerJSimpson]

Well It didn't blow a 15a fuse (calls for 2.5) I on left it on for a sec. I noticed a Hum (slight) coming from the transformer. Could the transformer be bad? How can I test it?

 

[markthefixer]

Check for shorted rectifier diodes, don't run it without a dim bulb tester again, unless you want to see if you can blow the main caps up....

The recitifier diodes (bridge?) are between the transformer and the caps (any of them).

 

[HomerJSimpson]

Maybe the Rectifier?

EDIT:

Cross posted.
I was thinking the same thing, how can I test it? I'll post a pic.

 

[HomerJSimpson]

Pic

 

[markthefixer]

Use the Dmm diode test. But to get an accurate reading one of the transformer secondary leads to the bridge must be opened up because otherwise the transformer will conduct and mask shorted diodes. On the Pioneers, almost all of the secondary windings have fuses in line with them before the bridge rectifiers etc....

Of course once you open up the lead, the short across the transformer is removed and the thing won't blow fuses (but of course it won't work either...)

 

[HomerJSimpson]

I took off both of the leads from the Transformer. I get a short across the first 2 from the left.

 

[grateful]

Yep high failure part in the 2230.

 

[HomerJSimpson]

Yep high failure part in the 2230.

Where do I get a similar replacement part?

 

[grateful]

Any medium power bridge rectifier will work as a replacement. Digikey mcm etc have them. Radio Shack may as well. You need a 6 amp or better full wave bridge rectifier. You may be able to scrounge one from an old junker also.

 

[markthefixer]

Here's a bunch:

http://www.allelectronics.com/cgi-bin/category/110/Bridge_Rectifiers.html

no affiliation, just an occasional customer.

 

[HomerJSimpson]

Any medium power bridge rectifier will work as a repalcement. Digikey mcm etc have them. Radio Shack may as well. You need a 6 amp or better full wave bridge rectifier. You may be able to scrounge one from an old junker also.

I have a Sony V3 parts doner and a Pioneer Sx-780 parts doner as well... DO either of there have the right one?

 

[grateful]

Yes they both may have a bridge rectifier that will work fine. In some cases they are made of seperate diodes if this is the case check the other receiver for a bridge in one package.

 

[HomerJSimpson]

I know the sony has a big square one like this onr from rat shack:

http://www.radioshack.com/product/i...&cp=2032058.2032230.2032269&parentPage=family

 

[grateful]

That will work fine. Note the 2 leads for the AC in and the other 2 are + and - the original has the stampings also. A dot of glue will secure it to the chassis.

 

[HomerJSimpson]

Replaced the rectifier diode using the one from the Sony doner. Powers up fine, no humm from the transformer either... Thank you for all the assistance.

 

[grateful]

sweet

 

[markthefixer]

If I notch this keyboard any more, it'll fall apart.....