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 🙂
😉
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 🙂
100 years 👍😋
Just to make it clear: is it mistake in the service manual?
boys you changed other capacitors ? / I read a lot the unreliability of the frako gold coluor /
Sorry for off... this TR-1055 was bought here in Ukraine
@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.
Did you have to desolder the gold caps to measure them?
@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.
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
c601 tr1040 tantal
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