Yamaha CX-1000 SW701

[Javik50k]

Hello everyone!

I'm currently restoring Yamaha CX-1000. But i made one big mistake.
Disassembled SW701 (Rec. out switch), cleaned...and forgot default position of the movable part. Now it's working strangely. Was unable to find any photo on the internet. Does have manual, but i have trouble decipher output code table.
Maybe someone will be able to help me? Almost restored this nice preamp (all that left is to repair SW701 and replace motor in motorized volume control).

With all respect,
Alex.

 

[Javik50k]

Already found it out. Now i must find VF282900 (motorized volume pot). But so far was unable to find one even on japanese sites.

 

[ubergeeknz]

Already found it out. Now i must find VF282900 (motorized volume pot). But so far was unable to find one even on japanese sites.

From the photo I could find it looks like an ALPS RK27. If you know how many gang and the value I'm sure you can get the Alps part to match. Or the motor itself may be repairable/replaceable.

 

[Javik50k]

From the photo I could find it looks like an ALPS RK27. If you know how many gang and the value I'm sure you can get the Alps part to match. Or the motor itself may be repairable/replaceable.

Resistance 10K, 4 units in stack. But with additional mounting and 5-6V DC motor.

 

[Javik50k]

Seems to be RK27114MC, but i'm not sure. Maybe anoyone with CX-1000 will confirm. $40 is not a big deal for fully restored CX-1000 anyway.

 

[Javik50k]

Also if jean-paul will read this thread: i'm interested in AD1860s. Will be good experiment with DAC replacement.

So far, everything else is working very well. My unit is 30 years old (88y) and all capacitors are ok and within tolerance! That was a Real Quality these days.

 

[Javik50k]

Ordered RK27114MC here. Now i'll see when it will arrive. My CX-1000 will be "almost as new", and i love it.

 

[Javik50k]

Purchased 10K RK27114MC today. Seems strange - motorized part is smaller. Case is blue instead of green. Will show photos later tomorrow. Markings are the same - 10KAX4

 

[Javik50k]

It's not RK27114MC. Original is slightly bigger, with some tricks had to install, smaller one. Works ok, no problems so far. Motorized control also working well. New pot is much softer to control (it's new, after all).

 

[Javik50k]

BTW: do not tight bracing nut to the max. It can block motor from turning pot axis freely. Volume curve is A (inverted log).
Now i will look for recapping this unit (but it'll cost more than pot replacement. If anyone have ready capacitor list for CX-1000, please, share.

Sorry for bad english.

 

[shreekumar]

BTW: do not tight bracing nut to the max. It can block motor from turning pot axis freely. Volume curve is A (inverted log).
Now i will look for recapping this unit (but it'll cost more than pot replacement. If anyone have ready capacitor list for CX-1000, please, share.

Sorry for bad english.

Hello Javik

Can you post a photo of the old pot
Showing the gear Side mechanism

Have you rcvd the list replaces the cap for Yamaha cx1000

Thanks and rgds
Shree

 

[Javik50k]

Here it is. That's original part. It is a bit larger than new ALPS (this one is ALPS produced also, but old model). I received cap list, planning to recap asap. Health issues, i was unable to do it earlier.

 

[shreekumar]

Thanks for the photograph

The gear mechanism seems to be intact,
What has caused the failure

Rgds
Shree

 

[shreekumar]

Hello Javik

Can you post a photo of the old pot
Showing the gear Side mechanism

Have you rcvd the list replaces the cap for Yamaha cx1000

Thanks and rgds
Shree

Hello

Have attached a PDF of a recap done by a member

Check if it helps in any way

Rgds Shree

 

[Javik50k]

Thanks for the photograph

The gear mechanism seems to be intact,
What has caused the failure

Rgds
Shree

It was the motor. I fixed it, but already installed new ALPS, so i kept this unit as a spare part. (Need to clean resistance modules, though).

 

[drogers5]

My motor is out on my Volume control, how difficult was the replacement, did you have do anything special to the new one. I thinking of ordering the new control, but want to make sure I do it correctly.

 

[shirleygibbons]

Really an amazing thread.

 

[drogers5]

Has anyone else replaced the Volume and was there any special mods that has to be done. I haven't pulled old one yet, just wanted to see if I needed to do anything special prior to pulling the old knob

 

[johnfalc]

Motorized volume control - Yamaha CX-1000

This is the part you need - VF282900 - it comes boxed with the motor.

[IMGDEAD]https://photos.app.goo.gl/kaa9uwQVB92Q3DHL8[/IMGDEAD]