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NAD 3020 recap
NAD 3020 recap
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Old 10th October 2018, 07:15 PM   #21
Ian Finch is offline Ian Finch  Australia
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If yours really is a standard 3020, the area you point to has 2 small caps C417, 418 but there is no C427 in the parts list or on the schematic, that I can see. The manual says these are 47uF 25V rated electrolytic type, as identified by Avtech. You can be certain if it is also next to a group of 4 small diodes.
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Old 10th October 2018, 07:21 PM   #22
Czorales is offline Czorales
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Quote:
Originally Posted by Ian Finch View Post
If yours really is a standard 3020, the area you point to has 2 small caps C417, 418 but there is no C427 in the parts list or on the schematic, that I can see. The manual says these are 47uF 25V rated electrolytic type, as identified by Avtech. You can be certain if it is also next to a group of 4 small diodes.

It looks so. Diodes (D405-D408).
This capacitor its exacly next to C422 (ceramic i think)
Thank you for the information.



The smaller regulator board has a C915,C916 which are 10uF 35V.
Can i replace them with 22uF 35V (whats the funktion of them) ?
If not, I will have to order them soon.
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Old 11th October 2018, 05:44 AM   #23
Ian Finch is offline Ian Finch  Australia
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Originally Posted by Czorales View Post
....The smaller regulator board has a C915,C916 which are 10uF 35V.
Can i replace them with 22uF 35V (whats the funktion of them) ?
If not, I will have to order them soon.
C915, 916 are respectively in parallel with C901,902 smoothing caps for the +/- 28V DC power supply. This is said to reduce the high frequency impedance of the large electrolytics and hence reduce noise. They are not critical values and you could fit good quality 22uF types but the lower value would be preferable.
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Last edited by Ian Finch; 11th October 2018 at 05:51 AM.
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Old 11th October 2018, 07:23 AM   #24
Czorales is offline Czorales
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Quote:
Originally Posted by Ian Finch View Post
C915, 916 are respectively in parallel with C901,902 smoothing caps for the +/- 28V DC power supply. This is said to reduce the high frequency impedance of the large electrolytics and hence reduce noise. They are not critical values and you could fit good quality 22uF types but the lower value would be preferable.

The problem is that NAD 3020 had 2 versions of regulator boards.
C915 and C916 (10uF 35V) were renamed and you cant find them in any service manuals.
These which you pointed for me are 2200uF x4. I am sending you picture of this board. Imgur: The magic of the Internet
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Old 14th October 2018, 10:35 AM   #25
Czorales is offline Czorales
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Can I replaced this capacitors pointed on my last Link ?

They are named C915 and 916. In service manual, they have 2200uF 35V and

in circuit 10uF 35V. Can I replace them with 22uF 35V ?
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Old 14th October 2018, 03:56 PM   #26
Goldie99 is offline Goldie99  United Kingdom
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Originally Posted by Czorales View Post
Can somebody tell me whats the capacity and voltage of C427 ? I was searching this capacitor in service manual, but i couldnt find it.
According to my notes, the C427 you're referring to should be 10uF / 35V - it's indeed not in the service manual, but was in an amp I rebuilt a couple of years ago.

Quote:
Originally Posted by Czorales View Post
The problem is that NAD 3020 had 2 versions of regulator boards. C915 and C916 (10uF 35V) were renamed and you cant find them in any service manuals
During the same rebuild, I also found the C915 & C916 caps on the regulator pcb - they were additional to two of the main 2200uF filter caps (also labeled C915 & C916) on the main pcb. The regulator board C915 & C916 were the same as yours: 10uF / 35V.

I'm not certain anymore where they fit in the circuit, but you should be able to easily see it from the solder side of the pcb. I just replaced all 3 with 10uF / 50V Pana FC
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Old 14th October 2018, 04:02 PM   #27
Czorales is offline Czorales
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Quote:
Originally Posted by Goldie99 View Post
According to my notes, the C427 you're referring to should be 10uF / 35V - it's indeed not in the service manual, but was in an amp I rebuilt a couple of years ago.



During the same rebuild, I also found the C915 & C916 caps on the regulator pcb - they were additional to two of the main 2200uF filter caps (also labeled C915 & C916) on the main pcb. The regulator board C915 & C916 were the same as yours: 10uF / 35V.

I'm not certain anymore where they fit in the circuit, but you should be able to easily see it from the solder side of the pcb. I just replaced all 3 with 10uF / 50V Pana FC

I have some Rubicons WXA 10uF 400V.

Do you know some disadvantages of using higher voltage capacitors (35V ->400V) ?
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