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1040 Filter cap confusion


happy_house
(@happy_house)
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I am replacing the filter caps on an Tandberg 1040. The old caps have "plain negative" written on them, with one pin marked with red color. I assumed this would mean that the red pin was positive and the other (unmarked pin) was supposed to be negative. I was a bit uncertain however, so I looked in the service manaul. To my surprise it indicated the opposite when I checked how the caps were soldered to the board: the red pin seemed to be the negative and the unmarked pin was positive.

I then found this blog which states that the manual shows the wrong polarity for the caps. https://tandbergista.home.blog/tr-1040/

Just wanted to double-check here before I put the new caps in, as it can become quite the mess if I put them in the wrong way... Am I reading the polarity wrong on the existing caps or is the service manual in fact wrong? My guess is the latter, but better safe than sorry 🙂

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This topic was modified 3 months ago by happy_house

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karol
(@karol)
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16164243531625692304882179443028

😉


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happy_house
(@happy_house)
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Ah, thanks! That settles it.

I'll get the marker out and do the same.
In another 50 years the next person to replace the filter caps should have no doubt 🙂


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karol
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100 years 👍😋


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koba
 koba
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Just to make it clear: is it mistake in the service manual?


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karol
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yes mistake in service manual


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karol
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boys you changed other capacitors ? / I read a lot the unreliability of the frako gold coluor /


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koba
 koba
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Sorry for off... this TR-1055 was bought here in Ukraine

07
08
12

 


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happy_house
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@karol I changed all electrolytics and tantalums, the golden ones all measured fine on my ESR meter however so they might have lasted a while longer.


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hagzo
(@hagzo)
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Did you have to desolder the gold caps to measure them? 


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happy_house
(@happy_house)
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@hagzo I did disolder them because I wanted to replace them all. My ESR meter supports checking caps in-curcuit as well so I could probably have checked them without desoldering them first.


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hagzo
(@hagzo)
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That good to know.  I was about to buy an ESR meter on account of the amount of old tandbergs I have 😀......i was thinking of this one that can test in circuit

https://www.fruugo.co.uk/peak-esr70-atlas-esr-plus-tester/p-48080575-95596892?language=en&ac=croud&gclid=Cj0KCQjwo-aCBhC-ARIsAAkNQis8X9HRFx7cLEk9JZia4V78hHJSLm3xi_mrN6iDrdfC7w0aDkFRH-kaAo3zEALw_wcB


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karol
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c601 tr1040 tantal

20210324 163831

 


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hagzo
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👍


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