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Yamaha CX-1000 SW701
Yamaha CX-1000 SW701
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Old 12th October 2019, 08:48 AM   #1
Javik50k is offline Javik50k
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Default Yamaha CX-1000 SW701

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.
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Last edited by Javik50k; 12th October 2019 at 08:52 AM.
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Old 12th October 2019, 03:46 PM   #2
Javik50k is offline Javik50k
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Already found it out. Now i must find VF282900 (motorized volume pot). But so far was unable to find one even on japanese sites.
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Old 12th October 2019, 09:21 PM   #3
ubergeeknz is offline ubergeeknz  New Zealand
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Quote:
Originally Posted by Javik50k View Post
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.
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Old 13th October 2019, 12:31 PM   #4
Javik50k is offline Javik50k
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Quote:
Originally Posted by ubergeeknz View Post
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.
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Old 13th October 2019, 12:37 PM   #5
Javik50k is offline Javik50k
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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.
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Old 13th October 2019, 12:44 PM   #6
Javik50k is offline Javik50k
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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.
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Old 16th October 2019, 11:48 AM   #7
Javik50k is offline Javik50k
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Ordered RK27114MC here. Now i'll see when it will arrive. My CX-1000 will be "almost as new", and i love it.
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Old 21st October 2019, 05:32 PM   #8
Javik50k is offline Javik50k
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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
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Old 22nd October 2019, 12:22 PM   #9
Javik50k is offline Javik50k
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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).
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Old 22nd October 2019, 01:28 PM   #10
Javik50k is offline Javik50k
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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.

Last edited by Javik50k; 22nd October 2019 at 01:30 PM.
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