Needing a 1970's Yamaha Engineer (employed by Yamaha)

[busaboy]

Cement Resistor vs Cement Molded Resistor?
Metal Plate Resistor?
Fire Proof Resistor?
Aluminum Electrolytic "Z" Type?
SBL Film?
MS?
UPF?
Carbon Film vs Fireproof Carbon Film?
Semiconductive Ceramic?

What is the point? You haven't explained why you replaced the parts you did.

 

[busaboy]

PS, I worked at Panasonic in it's heyday. Panasonic built almost all it's own components unlike Yamaha which only built semiconductors.

 

[Want to be]

PART 3 OF QUESTION:

#1 Replace Ceramic with Film?
#2 Replace Green Drop Mylar with Orange Drop DME?
#3 Replace Fuse Resistor with Metal Film?
#4 Replace with MJE15032G & MJE15033G?
? Green Resistor?
? Red Resistor?

Items marked with a ?: Are these acceptable substitutes? Anything better?
Pink Resistors are TAKMAN REX
Fuse Resistors are TAKMAN REY

 

[Want to be]

What is the point? You haven't explained why you replaced the parts you did.

Please accept my apology, the unit was worked on prior and had many failures. This is also an opportunity to see if newer technology can make a sound difference.

 

[Want to be]

PS, I worked at Panasonic in it's heyday. Panasonic built almost all it's own components unlike Yamaha which only built semiconductors.

When I worked for Siemens Medical Systems MRI Development Group, Siemens also made a vast majority of it's parts, thus I can understand the advantage.

 

[Want to be]

What is the point of this? If you want to learn about various resistor types, use Google.

Well understood, the issue is the wording that Yamaha used 😵

 

[stocktrader200]

What is the unit doing ? Noisy, no sound , dead channel etc.

 

[Want to be]

PS, I worked at Panasonic in it's heyday. Panasonic built almost all it's own components unlike Yamaha which only built semiconductors.

Most all electrolytic capacitors are now replaced with Panasonic FC

 

[JMFahey]

Cement Resistor vs Cement Molded Resistor?
Metal Plate Resistor?
Fire Proof Resistor?
Aluminum Electrolytic "Z" Type?
SBL Film?
MS?
UPF?
Carbon Film vs Fireproof Carbon Film?
Semiconductive Ceramic?

You have the "Starter Package Basic" [tm] which entitles to one component decoding service.

For more, please upgrade to the Pro version.
Only U$9.99 per Month, minimum contract 1 year.











🤣🤣 🤣 🤣 🤣

 

[Want to be]

What is the unit doing ? Noisy, no sound , dead channel etc.

Please accept my apology, the unit was worked on prior and had many failures. This is also an opportunity to see if newer technology can make a sound difference.

 

[Want to be]

You have the "Starter Package Basic" [tm] which entitles to one component decoding service.

For more, please upgrade to the Pro version.
Only U$9.99 per Month, minimum contract 1 year.











🤣🤣 🤣 🤣 🤣

Please expand upon this

 

[JMFahey]

What is the unit doing ? Noisy, no sound , dead channel etc.

I fear parts rolling "to improve it" 🙄

Might be wrong, of course.

 

[Want to be]

I fear parts rolling "to improve it" 🙄

Might be wrong, of course.

👍🤓

 

[Want to be]

Driver and Output Transistors found in unit:

Power Supply/Protection Board

 

[Want to be]

Driver and Output Transistors found in unit:

View attachment 1090786

Power Supply/Protection Board

View attachment 1090787

This is what a original board looks like (this person took this photo after replacing the electrolytic caps)

 

[busaboy]

Well understood, the issue is the wording that Yamaha used 😵

Japanese service manuals are translated to English by people who's native tongue isn't English and many don't have technical background. When I was a product manger for Panasonic I would cringe at the verbiage in the Service Manuals. Our Service Group was full of US citizens without a technical background as well.

Today you would be hard pressed to get a service manual for any product. Even if you could, you wouldn't have the SMD repair station and experience to do the work nor the replacement parts....

 

[busaboy]

Driver and Output Transistors found in unit:

View attachment 1090786




Unless you have a curve tracer to test the power transistors you remove, you won't know if some are "leaky" or have breakdown issues. Replacing every part with "modern" or possibly Chinese counterfeits is only inviting trouble. Unless your source is credible, you might be putting in counterfeit crap parts....

 

[Want to be]

Japanese service manuals are translated to English by people who's native tongue isn't English and many don't have technical background. When I was a product manger for Panasonic I would cringe at the verbiage in the Service Manuals. Our Service Group was full of US citizens without a technical background as well.

Today you would be hard pressed to get a service manual for any product. Even if you could, you wouldn't have the SMD repair station and experience to do the work nor the replacement parts....

While at Siemens we called it Germish half German/ half English
While at Toshiba we called it Japish half Japanese/ half English
No one had a clue to what was being written.

 

[Want to be]

I am using the full line of Peak Electronic Design test equipment

I only purchase parts from Mouser, DigiKey, Parts Connexion, HiFi Collective (UK)

 

[Want to be]

You have the "Starter Package Basic" [tm] which entitles to one component decoding service.

For more, please upgrade to the Pro version.
Only U$9.99 per Month, minimum contract 1 year.











🤣🤣 🤣 🤣 🤣

Thank you! I paid up! 🙂