Nikko Alpha 230 - Parts where to go

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Sandman01

Sandman01

Member
Joined 2020
#1
Hi
My original Alpha 230 is getting a bit cranky so it is probably time to do a recap before something craps out.
Does anyone have a good parts list or parts source recommendation for this unit?
I have a copy of the digital copy of the Service Manual, but the parts list is a bit of an eye test for me.
Looking for any sage advice to get going.

Thanks!

My Beta unit is probably also going on the bench once I get the Alpha back
 
#2
Nikko Recap Project - Preliminary work

Update... Reconfiguring my work area for the work to recap the amplifier... Here are some board pictures

Dropbox - 20210201_150150.jpg - Simplify your life
Dropbox - 20210201_150158.jpg - Simplify your life
Dropbox - 20210201_150214.jpg - Simplify your life
Dropbox - 20210201_150312.jpg - Simplify your life
Dropbox - 20210202_180705.jpg - Simplify your life

Now the visual problem area...
These two caps are C-803 and C-804
https://www.dropbox.com/s/jp7kjmarvr69g1y/20210201_150253.jpg?dl=0
https://www.dropbox.com/s/09xiao8kze3uk0g/20210202_180411.jpg?dl=0

Block Diagram and Schematic
https://www.dropbox.com/s/qybxidtjh51rnp8/Alpha 230 Block Diagram.JPG?dl=0
https://www.dropbox.com/s/ugwj92fw8igqiil/Alpha 230 Schematic.JPG?dl=0

C-803 and C804 function
https://www.dropbox.com/s/e0qf1k5aou0ixx9/c-803_c-804 Circuit function.JPG?dl=0

Looks like they are leaking
https://www.dropbox.com/s/e0qf1k5aou0ixx9/c-803_c-804 Circuit function.JPG?dl=0

Sizing the caps...
https://www.dropbox.com/s/s9ic9myxhtzqqv5/c-803_c-804 Diameter.JPG?dl=0
https://www.dropbox.com/s/p02f3w241zz53x3/c-803_c-804 Height.JPG?dl=0

Service Manual Specs
https://www.dropbox.com/s/yg7wmh6awwtqpar/c-803_c-804 Specs.JPG?dl=0

Mouser Options using Nichicon Caps...
Chart 1 of 2
https://www.dropbox.com/s/z5m6zspeitzre88/c-803_c-804 Nichicon 22mm_dia_options-1.JPG?dl=0
Chart 2 of 2
https://www.dropbox.com/s/z5m6zspeitzre88/c-803_c-804 Nichicon 22mm_dia_options-1.JPG?dl=0

How important are the "Ripple Current" values of these caps??
 
Last edited:
#3
The next issue is C-801 and C-802... I was thinking these would be hard to get

C-801 and C-802 specs from the Service manual
Dropbox - c-801_c-802 Specs.JPG - Simplify your life

Circuit Function
Dropbox - c-801_c-802 Circuit function.JPG - Simplify your life

Measuring the sizes
Dropbox - c-801_c-802 Specs.JPG - Simplify your life
Dropbox - c-801_c-80 Height.JPG - Simplify your life

Mouser options for C-801 and C-802
Dropbox - Mouser options for C-801 and C-802.JPG - Simplify your life

With a 24 Week lead-time, I need to look at another manufacturer...
Which ones have quality Caps that might have this size?? If I can narrow down some good manufacturers then I can narrow my search
 
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