Yamaha CA-2010 Acting a Fool

[rwwear]

My CA-2010 is acting up. It has intermittent distortion in the left channel at first. But after warming up it gets worse. Then it becomes louder and constant in both channels. Anyone familiar with this?

Also a parts list for the transistors would be very welcome. The online schematics are difficult.

 

[avionic]

@rwwear

It has intermittent distortion in the left channel at first

Dirty switches.

Then it becomes louder and constant in both channels

Power supply issue most likely. Look over or reflow the solder connections of the TO-220 transistors on the power supply board. Focus on TR410 ,411,414 and 415.

 

[rwwear]

@rwwear

Dirty switches.


Power supply issue most likely. Look over or reflow the solder connections of the TO-220 transistors on the power supply board. Focus on TR410 ,411,414 and 415.

View attachment 3821525

Thanks.
The PS is my first step. Switches will be cleaned. But they are very quiet already. I heard the class "A" switch can be a culprit but it appears to have been worked on by the seller.

 

[mbz]

The hifiengine schematic (only) is readable. The schematic in the sm is "impossible".

Both channels affected would point to power supply. Suggest inspect solder joints of transistors mentoned above.

 

[rwwear]

The hifiengine schematic (only) is readable. The schematic in the sm is "impossible".

Both channels affected would point to power supply. Suggest inspect solder joints of transistors mentoned above.

I ended up buying a readable copy from Analog Alley.

 

[rwwear]

Here's a list of PS transistors for the Yamaha CA-2010 if anyone is interested.

TR401, 2SC1918 E.F.G.
TR402, 2SC789 ~ Y
TR403, 2SC1213A C~D
TR404, 2SC1213A C~D
TR405, 2SA844
TR406, 2SA844
TR407, 2SC1918 E.F.G
TR408, 2SC1775
TR409, 2SA872
TR410, 2SD476 ANS
TR411, 2SB566 ANS (B C D)
TR412, 2SC1775
TR414, 2SC1624 O
TR415, 2SA814 O

 

[avionic]

I ended up buying a readable copy from Analog Alley.

Much better than anything free on line.

All of my Yamaha manuals were purchased from Norman. Including this one.