Inside Yamaha amps

[Doodski]

I've got a mentor for the repair Appreciated Sorry, I just got home it's past midnight, I will respond in details tomorrow. Yep, plenty of space in the shed to lay the components on a table

Looks like a nice meter and the probes are good for general purpose probing of thru hole PCBs.

 

[catch22]

@Doodski since the posts related to this repair may be spread over time, it will be easier to track if we continue in the dedicated topic
And if of any help to somebody in the future:

[FIXED] Yamaha A-S700 intermittent power-on failure (and eventually full failure)

[ SOLVED ] Yamaha A-S700 intermittent power-on failure. Updated as of 16 March 2024 Please help in repairing my Yamaha A-S700 Over recent time my A-S700 has developed an intermittent fault (and today eventually failed completely). It started a week ago, it would not switch on. I tried on/off...

www.audiosciencereview.com

see you there, thanks!

 

[Overseas]

Told you about same thing.

Yamaha A-S1200 bass

Hi, Does anyone knows this: when I turn de bass an treble to the left or right on my Yamaha A-S1200, the music stops for a second?

www.audiosciencereview.com

 

[TheBatsEar]

Told you about same thing.

Yamaha A-S1200 bass

Hi, Does anyone knows this: when I turn de bass an treble to the left or right on my Yamaha A-S1200, the music stops for a second?

www.audiosciencereview.com

If you think this is the same problem @catch22 has, i don't think so.

The A-S1000 and higher have a relay that basically bypasses treble and bass if they are at zero. Once you turn them away from zero, the relay switches and another path is used for the signal. A fair solution. I would have preferred a source direct switch, you could fast switch back and forth between the settings.

Anyway, the A-S700 has the switch and doesn't use relays for bypassing treble and bass.

 

[catch22]

If you think this is the same problem @catch22 has, i don't think so.

The A-S1000 and higher have a relay that basically bypasses treble and bass if they are at zero. Once you turn them away from zero, the relay switches and another path is used for the signal. A fair solution. I would have preferred a source direct switch, you could fast switch back and forth between the settings.

Anyway, the A-S700 has the switch and doesn't use relays for bypassing treble and bass.

That auto-activation of bypass was someone else's problem, I just summoned you to help LOL
But I wish one day this auto-activation will become also my "problem" - I mean I hope I will upgrade one day from A-S700 to A-S1200
You are lucky in Germany, there are so many good deals on your local kleinen-something-website For Ireland it is much more difficult.

 

[Overseas]

I am talking about Steph AS1200 issue from that topic.
I checked it for AS1100 and AS2200, the same.
If Catch explanation is right, I am not sure, but sounds plausible.
So the subject is not the zero position, it is different.