Yamaha A-400 schematics/bias needed

[hiwiho]

I know a manual is available from Schaltungsdienst Lange, but the amp's old (1984) and suffers from various things (bass equilizer dead, one channel gone completely) so I don't want to pay 20euros for things I'm not shure I will be able to fix...

Does anyone have a schematic he could mail me? One of the bigger models (a-500, a-700) might work, too...

And any info on the bias?

Thanks in advance,
Matthias

dolmengaenger*no..spam*@epost.de

(remove *no..spam*)

 

[hiwiho]

No one able to give even a slight hint?!? Cannot be... Come on, check your manual archives

 

[anatech]

Hi hiwiho,
I was going to email you, but I can't through the board. PM me. I have a zip of the A-700 that may help you.
-Chris

 

[hiwiho]

Thanks Chris,

I just wrote you an email!!

matthias

 

[anatech]

Hi Matthias,
You have mail.

 

[hiwiho]

Thank you very very much, Chris. Now i can see what I can do!

 

[destroyer X]

You can find the Yamaha A700 integrated amplifier

In our forum friend site:

www.schematicsforfree.com

more than 3 Megabytes size.

regards,

Carlos

 

[destroyer X]

Matt site is a little bit confused, follow this adress

Here you have the image.

Carlos

 

[hiwiho]

Thank you, Carlos, I didn't know this site and happily got my file. As long as a bit confusing site design leeds to a result, I don't mind

Matthias

 

[destroyer X]

I feel good with that Matthias, by the way, your

Name is very used here.

I hope the schematic will help you.

Matt is our forum friend...he is with us sometimes.

Carlos

 

[hiwiho]

Name is very used here.

Yes, I don't know how many Matthias I know myself. A guy with exactly the same name (+familiy name) has been living here in Berlin for years. Now he obviously moved - I get a lot of his mail now

Matthias

 

[spongebob-2005]

A-500 schematics

Sorry for late answer. Maybe it helps. Schematic for Yamaha A-500 attachted.

 

[hiwiho]

Thanks!

A while back, i ordered the schematics from Schaltungsdienst Lange and repaired the amp. The voltage driving chip was gone. As only a newer revision of that chip was available, i had to make a lot of changes to a bunch of C's to get rid of massive oscillation i had after replacement. But since then, the amp works fine now (which is some 9 months back i think)

The thread of the repair can be found here:
http://www.diyaudio.com/forums/showthread.php?threadid=50600&highlight=

It also features the schematic of the a-400

Matthias