Project: Yamaha CA-2010

[ranf1970]

That is amazing work! I have a CA-2010 in need of restoration and am just waiting for the time and equipment to do this kind of thing. Otherwise, I might just have someone with more expertise do this for me. You definitely have some mad skills.

 

[cdfac]

That is amazing work! I have a CA-2010 in need of restoration and am just waiting for the time and equipment to do this kind of thing. Otherwise, I might just have someone with more expertise do this for me. You definitely have some mad skills.

Unless you have obvious issues with noise or something else, or you're crazy like the OP ;-), I would start with just replacing electrolytic capacitors, tantalum capacitors, and cleaning all switches and pots per protocol. if you have no expertise for this kind of work, I would definitely recommend shopping it out to someone else, because the 2010 is absolutely worth a couple hundred extra dollars at the end of the day to make sure the job is done right and the unit is still working when the solder smoke clears!

 

[oftheclod]

Unless you have obvious issues with noise or something else, or you're crazy like the OP ;-), I would start with just replacing electrolytic capacitors, tantalum capacitors, and cleaning all switches and pots per protocol. if you have no expertise for this kind of work, I would definitely recommend shopping it out to someone else, because the 2010 is absolutely worth a couple hundred extra dollars at the end of the day to make sure the job is done right and the unit is still working when the solder smoke clears!

As someone with no expertise about to undertake this exact project on a ca2010 I took it to a repair shop and they quoted me $800-$900 for less work than this so I’m going to learn by doing haha. Great post here. Really helpful.

 

[Mircone]

Congratulations, very good job. Here in Italy we call it "capolavoro"! I also have one. Looking for someone for a such good restoration (i' m dreamin'). Thanks for photos and technical data.

 

[nabeelsayegh]

Just read through all of this and I applaud the OP for the time and effort put into this. The end result is a one of a kind system. CDFAC above touched on this a bit, but I wanted to field this question out there to see what everyone's thoughts are. Beside replacing electrolytics, tantalums film caps in the signal path and the fusistors, what other components should be replaced from the perspective of preventative maintenance (while it is already opened up.) I would be interested in doing anything that will create an audible improvement to sound quality and protecting the unit from things known to fail. For example, I don't replace transistors unless they are bad or on the 'see it, replace it' list, but is there any real value in proactively replacing the main power outputs and pre-drivers?

Note: The unit I have is working fine (save blown out meter lamps and noisy pots/switches). Bias adjustment was no issue and the sound was great and no noise that I could detect.

 

[avionic]

but is there any real value in proactively replacing the main power outputs and pre-drivers?

IMHO No... OEM output transistors have a much better bandwidth than the Onsemi replacement outputs.

 

[avionic]

KSA1220AYS outdated and no longer available

Still some available but there on backorder.

 

[avionic]

2SA777 Q,R outdated and no longer available
KSA1220AYS outdated and no longer available
Any other ideas?

https://www.mouser.com/ProductDetail/Toshiba/TTA006BQ?qs=B6kkDfuK7/BafvTE/b3gJA==

 

[avionic]

Other options

Start manufacturing parts in the USA...

 

[avionic]

2SC11116

2SC1116 ----> MJ21194G
2SA747 ------> MJ21193G

 

[avionic]

View attachment 2254573

View attachment 2254575

This is a CA-2010 thread.
This is not a CA-2010.. Looks like and A-1 ..

 

[Super Noob]

Looks like your output TO3….
NPN
100W
180V
Veb = 6V
10A
5 MHz
HFE = min 30

If you are going to replace…. these are the typical replacements for outputs that are utilized.
MJ21194G (NPN)/ MJ21193G (PNP)
250W
250V
Veb = 5V
16A
4 MHz
HFE = 25 min

 

[nabeelsayegh]

I would check out this thread...
https://audiokarma.org/forums/index.php?threads/c2a-transistor-equivalents.766669/

2SC1913=KSC2073 or MJE15032
2SA913=KSA940 or MJE15033

For the 2SC1213, I have replaced them with the KSC2383YTA's without issue so i think you are safe there.

 

[bobdod]

Some New LEDs / MOD:

I am currently planning the restoration of my CA-2000 (JDM CA-2010). To say that this thread is incredibly helpful would be an extreme understatement. Many many thanks for your meticulous documentation. If at all possible, can you please provide more detail on parts used, or a schematic, for the LED conversion?

 

[bobdod]

View attachment 2286850View attachment 2286851

 

[avionic]

1N4007?

That will work..

 

[bobdod]

I am being told that I have DC on one or both Main Boards. I have checked every component on both boards and have not found anything defective. Since these boards become buried in the heat sinks when installed how does one troubleshoot them?

View attachment 2493397

Are you measuring excessive DC voltage at the amps output? What does "I am being told" mean? There are trimmers to adjust DC offset on this unit. Is it coming out of protection?

 

[bobdod]

Have you tested all resistors, including the white ceramic ones out of circuit? What is the measured DC offset for each board? Does DC offset respond to trimmer adjustment? Did you replace the bias and DC offset trimmers?

When I went through mine, I found many drifted resistors that made setting the bias correctly not possible.

 

[bobdod]

View attachment 2497734 View attachment 2497735 View attachment 2497736 View attachment 2497737 View attachment 2497738

That looks like a CA-1010? Probably good to clarify that since you posted on a CA-2010 thread. I would suggest creating your own thread at this point.

 

[mbz]

I would suggest creating your own thread at this point.

What's the aversion to creating your own thread?