Casio CZ-5000 saturated/distorted output

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Precocyous
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Casio CZ-5000 saturated/distorted output

Post by Precocyous » Fri Apr 29, 2016 9:48 am

Hi guys!

I'm new in this forum, and I wanted to ask for a little help with a Casio CZ-5000 that I bought last week. Seems to be in good condition, capacitors seems to be ok (I'm not a tech, but I've got a little knowledge about electronics), resistors and all that stuff, and I really don't know what could be causing the problem.

I plugged the headphones in the respective jack, turned it on, and when I proceed to slide volume knob a little bit and it sounded something like white-background-noise and in my head I said "Ok, dirty slider", but when I hit the first chord, it sounded VERY LOUD, distorted, almost like blowing my headphones... and my ears.

I opened it up and I saw that's not very bad inside, just dust and a pair of little cockroach's, nothing that a little bit of attention can't deal with. I checked the relay, I don't know how it should be but I tried to clean with some paper and I still have the same problem, I tried with external keyboard speaker and still is very loud and like distorted/saturated.

I just want this thing running, maybe It's just a little thing causing this horrible sounding, because as far I know, this synth is very good. I live in a far, far place (Outside US) and near me there aren't any technicians who can deal with synths.

I'm gonna post some pictures to let you see how it looks (Yes, I need a good lamp):

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English is not my native language, but i try to do my best :mrgreen:
Hope you could help me. Thanks.
- Charlie.

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rsaintjohn
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Re: Casio CZ-5000 saturated/distorted output

Post by rsaintjohn » Sun May 01, 2016 4:23 pm

Based one what you are describing, and what is a somewhat common problem with old CZ's, I would look closer at the relay. You may simply need to replace it. That would be my first step to try to isolate the problem.

Do a Google search for cz 5000 omron . These are two links worth checking out:



https://jimatwood.wordpress.com/2011/05 ... f-the-80s/ (scroll way down to the comments for details and pictures)

http://youthvulture.blogspot.com/2013/1 ... ement.html

There is a guy on eBay who sells replacement parts, and I've bought from him before (blue planet media).

Robert
--
Robert Saint John
Cleveland, OH USA

db0451
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Re: Casio CZ-5000 saturated/distorted output

Post by db0451 » Sun May 01, 2016 7:17 pm

Yup. In other synths that use transistors for muting instead of relays, a nearly identical symptom can present. Weirdly this is not very widely discussed, yet it's happened to me multiple times, including repeats in the same synths. I guess maybe I was doing something wrong - like plugging cables in/out while the power is on, which might be able to cause harmful shorts in the 'in-between' states. Suffice it to say I've stopped doing that... and bought a lot of spare transistors.

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Precocyous
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Re: Casio CZ-5000 saturated/distorted output

Post by Precocyous » Tue May 03, 2016 12:06 am

Thanks for replying to me. I will assume that I can replace the relay with this same specs:

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I'm gonna replace all the relays and pushbuttons. I will tell you if it worked, hope it does :mrgreen:
- Charlie.

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madtheory
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Re: Casio CZ-5000 saturated/distorted output

Post by madtheory » Tue May 03, 2016 8:32 am

Have you checked the slider with. Multimeter to see that it reads all resistances smoothly?

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