Hi everyone,
I’ve been restoring an old equalizer and recently replaced all the electrolytic capacitors. Everything has been working great, but I ran into a small issue with the last capacitor I replaced.
According to the service manual, this capacitor is supposed to be ceramic (non-polarized) with a value of 0.022 µF. However, the original one soldered on the PCB from the factory was an electrolytic capacitor, and its value was 10 µF. When I desoldered it, I didn’t note its orientation, and now I’m unsure about the correct polarity for the new electrolytic capacitor I’ve installed.
The capacitor is located between the ground of the LINE OUT/REC OUT connectors and the general chassis ground. I’ve installed the new capacitor with the negative leg facing the chassis ground, assuming it’s the lower potential point.
Does this orientation sound correct, or should it be reversed? Any insights would be greatly appreciated!
Thanks in advance!
I’ve been restoring an old equalizer and recently replaced all the electrolytic capacitors. Everything has been working great, but I ran into a small issue with the last capacitor I replaced.
According to the service manual, this capacitor is supposed to be ceramic (non-polarized) with a value of 0.022 µF. However, the original one soldered on the PCB from the factory was an electrolytic capacitor, and its value was 10 µF. When I desoldered it, I didn’t note its orientation, and now I’m unsure about the correct polarity for the new electrolytic capacitor I’ve installed.
The capacitor is located between the ground of the LINE OUT/REC OUT connectors and the general chassis ground. I’ve installed the new capacitor with the negative leg facing the chassis ground, assuming it’s the lower potential point.
Does this orientation sound correct, or should it be reversed? Any insights would be greatly appreciated!
Thanks in advance!
You are right, sorry for that!
It's a Technics SH-8045
The schematic (The capacitor is C13, marked with a red arrow)
As you can see, this capacitor is placed between two grounds. I soldered the new cap with the negative side facing the right ground (chassis).
It's a Technics SH-8045
The schematic (The capacitor is C13, marked with a red arrow)
As you can see, this capacitor is placed between two grounds. I soldered the new cap with the negative side facing the right ground (chassis).
Use a 10uF bipolar electrolytic and you won't have to worry about polarity. For example:
https://www.digikey.com/en/products/detail/nichicon/UES1H100MPM1TD/4317411
https://www.digikey.com/en/products/detail/nichicon/UES1H100MPM1TD/4317411
Thanks everybody for the replies.
You mean between the two legs of the capacitor?
Ok. Not at home right now, but I'm checking again the service manual and I found this:
Every Output and Input ground goes directly to pin 12. Pins 17, 19, 21, 10 and 14 goes nowhere. Then:
From pin 12 goes to first leg of the capacitor. Then the other leg of the cap goes to chassis.
So I can assume that the Output & Input grounds are connected to chassis via C13.
So i guess the polarity of this cap is irrelevant whether it is ceramic or electrolytic.
Maybe another possibility is to solder a 22nf ceramic capacitor as described in the service manual.
I really don't know why the SM says 22nf ceramic but what I found into the EQ was a 10uf electrolytic.
Edit:
LOL look at that:
I found this picture of the same cap (using an electrolytic one instread of ceramic as the Service Manual says) and the negative leg is facing the chassis. So problem solved.
I really don't know why the SM says 22nf ceramic but what I found into the EQ was a 10uf electrolytic.
Edit:
LOL look at that:
I found this picture of the same cap (using an electrolytic one instread of ceramic as the Service Manual says) and the negative leg is facing the chassis. So problem solved.
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