Capacitors with corroded connections

[Blue Shadow]

I read recently that ConradH had a Marantz that did not work and while he was investigating he found a couple/few capacitors whose legs had corroded where they enter the cap body. A 2230, IIRC.

The 1030 that I refurbed was missing a channel and I believe it was for the same reason.

I'm wondering how common this is on the old Marantz gear and if you have other gear experience how often have you seen this as a reason for a missing channel.

 

[CohibaJoe]

I read recently that ConradH had a Marantz that did not work and while he was investigating he found a couple/few capacitors whose legs had corroded where they enter the cap body. A 2230, IIRC.

The 1030 that I refurbed was missing a channel and I believe it was for the same reason.

I'm wondering how common this is on the old Marantz gear and if you have other gear experience how often have you seen this as a reason for a missing channel.

Had this with Kenwood KA-1100SD on the power board during my recap.

 

[Lavane]

Are they more often the caps that were glued to the PCB? Maybe something in the glue? ive seen more than a few pictures of corroded cap leads here on AK and it seems like a lot of the caps were glued down.

 

[gadget73]

I've seen it on various caps. The seals fail on the electrolytics and the magic juice runs out. Sometimes you'll also find the crud on the PCB around where the leg went through. I have pictures somewhere of a trip computer I rebuilt out of a Lincoln. Half the caps had green fuzzy legs and the green conformal coating over the copper foil traces (double sided PCB) was eaten away where it made contact.

 

[patfont]

This was off a Marantz 1060 Amp Board, it was glued.

 

[jstang]

Old units had caps that had riveted leads where the rivets would loose connection from the repeated heat cycles.

You can't win... Everything fails over time.... These units are 40 years old or older.

Jk

 

[bktheking]

I've run across a couple in Marantz power supplies.

 

[Blue Shadow]

Old units had caps that had riveted leads where the rivets would loose connection from the repeated heat cycles.

You can't win... Everything fails over time.... These units are 40 years old or older.

Jk

Actually I did win. The 1030 I fixed had a missing channel and after following Brad's advice about checking a few things he said go ahead and recap it. That is when this issue was discovered and the unit worked just fine after the recap.

These caps, if not glued down, will rock a good bit more when touched, than if both legs are solid so that is one way to check on things. But recapping these 40 year old units is probably best, eliminate the possibility. Unfortunately, we are taught to repair any problems before recapping and this is a single instance where on a smaller unit, recapping might just be one route to repair.

jstang below says first I didn't win then I did. Fortunately, I went into the 1030 with my eyes open. Paid very little and it has the cabinet so no loss under any circumstances. Then I see it and it is an early engraved unit with the pre/power connections on the back. Big win even before I got it fixed.

 

[jstang]

First you didn't .... Then you did....

Jk

 

[blhagstrom]

Marantz 4270 Dolby unit, no glue.

Same 4270, pre-amp, no glue.

Marantz Model 26, main board, no glue.

I haven't found any like that in other brands....yet.

 

[rBuckner]

Yep, seen it a couple of times meself. It's not real common for me though.

 

[hirscwi]

So it appears that Marantz has the market cornered on caps that fall apart. Unique but not terribly valuable. I had a 2230 with 4 or 5 caps that failed with a lead broken off. Simple recapping put the thing completely right (and it didn't play before).