Nakamichi 400 Series Scheamtics???

flg · 21st December 2006, 03:58 PM

My brother has a Nakamichi 410, 420 & 430. I believe these things are from the '70s. Naturally they need a little work. Does anyone have any info, service manuals or schematics?
Thanks

anatech · 22nd December 2006, 01:32 AM

They shouldn't be too hard to figure out. Work carefully and take pictures before you start!

-Chris

flg · 22nd December 2006, 04:47 AM

Yep, The initial problem is, the pre has a bad dual volume pot... And, the Tuner never realy tuned good...
Nothing major yet... But it did not sound as good as I expected on his little Alessi Monitors???

anatech · 22nd December 2006, 06:43 PM

Hi flg,
It may be the small monitors.

The build quality on those Naks should be pretty good. Given the age of them, have a good look at the power supplies and coupling caps. Replace the preamp's ceramic caps with mica, and the audio path of the Tuner if there are any in there.

Test on some bigger speakers that you are familiar with.

-Chris

flg · 23rd December 2006, 12:06 AM

Well, I was thinking the power supply caps were a givin... Coupling, I'll do the best I/he can afford/fit and mica ha? The tuner, I was hoping to tweak??? Even my brother mentioned that? He's a Cheff??? Any real Idea's there???
I don't have any familiar speakers right now...Just moved and the crappy boxes for my F20BU's had to go... Yea I know...
Thanks

anatech · 23rd December 2006, 01:07 AM

Hi flg,
Tweaking tuner alignment is a pro's job with special equipment not found in your average shop. That's off limits.

Coupling caps are not expensive. You want to use a good type, not a name brand.

-Chris

21st December 2006, 03:58 PM	#1
flg diyAudio Member Join Date: Jul 2005 Location: North East	Nakamichi 400 Series Scheamtics??? My brother has a Nakamichi 410, 420 & 430. I believe these things are from the '70s. Naturally they need a little work. Does anyone have any info, service manuals or schematics? Thanks

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22nd December 2006, 01:32 AM	#2
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	They shouldn't be too hard to figure out. Work carefully and take pictures before you start! -Chris

22nd December 2006, 04:47 AM	#3
flg diyAudio Member Join Date: Jul 2005 Location: North East	Yep, The initial problem is, the pre has a bad dual volume pot... And, the Tuner never realy tuned good... Nothing major yet... But it did not sound as good as I expected on his little Alessi Monitors???

22nd December 2006, 06:43 PM	#4
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi flg, It may be the small monitors. The build quality on those Naks should be pretty good. Given the age of them, have a good look at the power supplies and coupling caps. Replace the preamp's ceramic caps with mica, and the audio path of the Tuner if there are any in there. Test on some bigger speakers that you are familiar with. -Chris

23rd December 2006, 12:06 AM	#5
flg diyAudio Member Join Date: Jul 2005 Location: North East	Well, I was thinking the power supply caps were a givin... Coupling, I'll do the best I/he can afford/fit and mica ha? The tuner, I was hoping to tweak??? Even my brother mentioned that? He's a Cheff??? Any real Idea's there??? I don't have any familiar speakers right now...Just moved and the crappy boxes for my F20BU's had to go... Yea I know... Thanks

23rd December 2006, 01:07 AM	#6
anatech diyAudio Moderator Join Date: Jun 2004 Location: Georgetown, On	Hi flg, Tweaking tuner alignment is a pro's job with special equipment not found in your average shop. That's off limits. Coupling caps are not expensive. You want to use a good type, not a name brand. -Chris

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