Hello Scott,
Thank you for sharing this mouser reference, I will get these ones! So this resistor replacement choice answers to my previous question at same time, they are definitely 5W/1ohm resistors as described in the manual, and as Joan also concluded before (then K stand for 10% tolerance).
Knowing the role of these resistors is valuable indeed, and now I better understand the heating cause of these, as there must have been some short on the 15V rails in the circuit in first place.
Since they're supposed to protect Tr701 and Tr702 transistors by limiting current draw under 15 amps, should I conclude the outputs transistors themselves are 100% kept safe and operating?
thx!

Thank you Joan, interesting! Yes it would be great if you could double check that, in case nobody else confirms this.Thanks!

That is probably the tolerance code "K" which means +/- 10%. So, anything between 0.9 and 1.1 ohms is within tolerance ;)

I can check on my CS-80 Sunday if no one else is able to do by then.

Hello everyone,

As I ran into recent issues with my CS80 power supply, I decided to go thru the recapping/4558's swap, that's when i realized that the white resistors connected behind the power transistors (Tr701+Tr702) suffered/leaked in some ways. Before powering things up again, I decided to replace these for future proof reliabilty.
Trying to find proper replacement for these, I realized there is some confusion between the reference described in the Part List Manual?and what's physically labelled on the resistor itself: in the Yamaha manual, I think the correct one is mentioned as 'cement molded resistor 5P 1Ω' , whereas it's printed ?' 5W 1ΩK' on the resistors themselves, which shows to my understanding, a big difference in resistance value (1ohm to 1 kohms).
I know the Yamaha manuals can be erroneous sometimes, but in the same time since I'm not the original owner of the CS80 I am not 100% sure the actual resistors are that legitimate in there.
So before going any further, any advices/experience feedbacks would be very helpful at this step, thank you!

did you ever get this sorted out joao?

hi there

I'm having a similar problem with my cs-60, the 'speed' on the Sub-Oscillator section does nothing at all, essentially rendering the Sub-Osc useless for modulation. Aftertouch is working great.

does this sound like the same issue you were having?
thank u!!

- teo

hi all! I'm new here, so please forgive me if this could be worded better.
It's great to know there's a community for this.
I just bought this CS-60 from a shop called Perfect Circuit, reputable place. Listed in excellent condition, to be honest it's cosmetically by far the nicest CS-60 i've ever seen!! it looks brand new. I was told it was working perfectly as it came from the owner's collection.

Essentially, the Sub-Oscillator section isn't working correctly. specifically the 'speed' slider changes nothing at all, no matter what function it's set to. If i bring the VCO, VCF, or VCA down, i notice a slight change in that parameter, but the speed and waveform/function parameters change nothing. The 'noise' function affects it, but the speed changes nothing.
Within the main oscillator section, the noise slider also changes nothing.

really hoping i'm overlooking something, any help or insight would be so appreciated.

attached is a video showing the issue:?

thank you so much!!
-teo

You might be forgetting that "the resistor in series" also includes
the capacitor itself. Add an ohm or so for electrolytics due to ESR.

On Wed, Feb 10, 2021 at 1:11 PM Scott Rodriguez
<synthrodriguez@...> wrote:

Very good, thanks for the thought and reply.

On Wed, Feb 10, 2021 at 7:06 AM Joachim Milson <joachim.milson@...> wrote:

Scott: The discharging speed of a capacitor is determined by its value and by that of the resistor in series with it (T=RC). So I don't think the type of the capacitor really matters.

Scott: The discharging speed of a capacitor is determined by its value and by that of the resistor in series with it (T=RC). So I don't think the type of the capacitor really matters.

Great info!

Here's a snapshot of a spreadsheet I created and put under Files many years ago:

aftertouch_response.jpg

And here's how I did it:

cs80_pressure.jpg

Thank you!

Hi,
It's a ten levels analog signal. It is smoothed by a filter later in the signal path.
You'll find a detailed explanation of how it works here:

Hi all,
I've recently been watching a video about the internals of the CS80
and it briefly showed the aftertouch board. It looks like it has
multiple exposed vertical lines on the pcb, and then an inverted V
shaped piece of conductive rubber that connects more lines the harder
you press down on it.

Is this system essentially digital? How many different levels can it
achieve - what sort of "bit depth" is there?

Thanks

Hello,

I've got a CS80 and CS60 for sale here.? Both have Kenton MIDI and unison mods.? Both have been gone over by a professional musician and are working perfectly and in tune.? The CS80 has had all CMOS changed out as well as other upgrades.? Both have lids.??

Located in Chicago, IL USA

You can contact me at mike@... for more info.??

开云体育

Hi Tony,

I would likely be interested in a set of new contacts, please keep me informed on the development.

Thank you


Martin