• The move to the new server is done. There are some software and database maintenance updates in process. This has us passing the hat around to help out. We appreciate any donations. Seriously, even a dollar helps. The payment page may be found here - https://www.audiokarma.org/support.html

Yamaha C-2 component leak

index.php


C227/228
 
After putting the high power magnifying glass on it: Maybe that is a 3 and not an M, crazy font. I also noticed a couple more ceramic caps with the black dot, They state the value followed by "J"?
 
My first question is why are the voltages so high? Values specified to be in the 30V range are measured in the 50V range.

The voltage off of the transformer are specified to be 33VAC with 120VAC at the Primary
They measure as 41VAC

Also the power switch doesn't change power to the PS Board (On/Off). It is always on. The only thing the power switch changes is the power light On/Off.
 
TR401 and 402 are JFET,s Drain,source and gate.. Not emitter,base and collector.
 
Yamaha5000 said:
I guess you have never seen these black topped ceramic caps in any other Yamaha equipment?
Click to expand...
Probably have . But I don't pay them much attention if there is nothing wrong with them. If it ain't broke,don't fix it. Come to think of it. The only ceramic cap I have ever replaced was due to the glue corrosion of the leads.
 
Also the power switch doesn't change power to the PS Board (On/Off). It is always on. The only thing the power switch changes is the power light On/Off.

Looks like the power switch never did any function:
20210624_121746.jpg 20210624_122018.jpg
 
You must log in or register to reply here.
Back
Top Bottom