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Help with CZ-1000 dac offset adjustment

Help with CZ-1000 dac offset adjustment

2015-07-30 by oakcanada@...

Hi,

After putting in the research, I'm fairly certain that the noise issues on my 1000 are due to the dac offset voltage needing adjustment. I've been looking all over for the full service manual, but so far have only come up with the circuit diagrams. anyone on here able to point me in the right direction? I think if you could give me a bit of info on where the trimpot is and how to get at it, that might be enough. and maybe correct voltage measurement?


thanks in advance for any help,


Dan

Re: [CZsynth] Help with CZ-1000 dac offset adjustment

2015-07-31 by Jérôme

Hi there,

I also had a noise issue on my CZ-1 that I fixed by changing the relay. I don't know much in electronics but I found an article explaining that almost all noise issues on the CZ line are caused by this relay, which is not manifactured anymore, but there is another replacement that I installed successfully.

Here is the article: http://youthvulture.blogspot.fr/2013/11/casio-cz-1-relay-replacement.html?m=1

Cheers,

Jérôme

"oakcanada@gmail.com [CZsynth]" <CZsynth@yahoogroups.com> a écrit :

Hi,

After putting in the research, I'm fairly certain that the noise issues on my 1000 are due to the dac offset voltage needing adjustment. I've been looking all over for the full service manual, but so far have only come up with the circuit diagrams. anyone on here able to point me in the right direction? I think if you could give me a bit of info on where the trimpot is and how to get at it, that might be enough. and maybe correct voltage measurement?


thanks in advance for any help,


Dan

Re: Help with CZ-1000 dac offset adjustment

2015-07-31 by oakcanada@...

Many thanks for your response, and the link! That looks like an easy and worthwhile part swap.
Even if it doesn't solve all of the noise issue, it should help.
The noise I'm hearing is a sort of crackling, soft distortion produced mostly when a few notes are
played together. I've seen other people ascribe that type of symptom to dac offset voltage mis-
calibrated.
The noise floor seems about what I'd expect from it, maybe a bit more. Sounds like
the replacement relay could help with that.

Re: [CZsynth] Help with CZ-1000 dac offset adjustment

2015-07-31 by Daniel Forró

According to this page

http://madtheory.com/site/?p=320

you can use for this Service Manual for CZ1, circuit is similar if not  
the same.

As he wrote it's possible to do it by ear.

Good luck!

Daniel Forro
Show quoted textHide quoted text
On Jul 31, 2015, at 7:58 AM, oakcanada@... [CZsynth] wrote:

> After putting in the research, I'm fairly certain that the noise  
> issues on my 1000 are due to the dac offset voltage needing  
> adjustment.  I've been looking all over for the full service manual,  
> but so far have only come up with the circuit diagrams.  anyone on  
> here able to point me in the right direction?  I think if you could  
> give me a bit of info on where the trimpot is and how to get at it,  
> that might be enough.  and maybe correct voltage measurement?
> thanks in advance for any help,
>
> Dan
>

Re: [CZsynth] Help with CZ-1000 dac offset adjustment

2015-07-31 by JAMIE logan

cz101 is the same schematics


http://www.burnkit2600.com/manuals/CASIO_CZ-1000_SRV.pdf
Show quoted textHide quoted text
> On 31 July 2015 at 10:37 "Daniel Forró danforcz@yahoo.com [CZsynth]"
> <CZsynth@yahoogroups.com> wrote:
> 
>      
> 
>     According to this page
> 
>     http://madtheory.com/site/?p=320
> 
>     you can use for this Service Manual for CZ1, circuit is similar if not
>     the same.
> 
>     As he wrote it's possible to do it by ear.
> 
>     Good luck!
> 
>     Daniel Forro
> 
>     On Jul 31, 2015, at 7:58 AM, oakcanada@gmail.com [CZsynth] wrote:
> 
>     > After putting in the research, I'm fairly certain that the noise
>     > issues on my 1000 are due to the dac offset voltage needing
>     > adjustment. I've been looking all over for the full service manual,
>     > but so far have only come up with the circuit diagrams. anyone on
>     > here able to point me in the right direction? I think if you could
>     > give me a bit of info on where the trimpot is and how to get at it,
>     > that might be enough. and maybe correct voltage measurement?
>     > thanks in advance for any help,
>     >
>     > Dan
>     >
> 
> 
>     
> 


 

>

Re: [CZsynth] Help with CZ-1000 dac offset adjustment

2015-07-31 by Loscha

you initialize the patch (sine wave)

you adjust it by ear
Show quoted textHide quoted text
On Fri, Jul 31, 2015 at 8:41 PM, JAMIE logan jammie.emma@... [CZsynth] <CZsynth@yahoogroups.com> wrote:

cz101 is the same schematics


http://www.burnkit2600.com/manuals/CASIO_CZ-1000_SRV.pdf

On 31 July 2015 at 10:37 "Daniel Forró danforcz@... [CZsynth]" <CZsynth@yahoogroups.com> wrote:

According to this page

http://madtheory.com/site/?p=320

you can use for this Service Manual for CZ1, circuit is similar if not
the same.

As he wrote it's possible to do it by ear.

Good luck!

Daniel Forro

On Jul 31, 2015, at 7:58 AM, oakcanada@... [CZsynth] wrote:

> After putting in the research, I'm fairly certain that the noise
> issues on my 1000 are due to the dac offset voltage needing
> adjustment. I've been looking all over for the full service manual,
> but so far have only come up with the circuit diagrams. anyone on
> here able to point me in the right direction? I think if you could
> give me a bit of info on where the trimpot is and how to get at it,
> that might be enough. and maybe correct voltage measurement?
> thanks in advance for any help,
>
> Dan
>




Re: [CZsynth] Help with CZ-1000 dac offset adjustment

2015-07-31 by Gordonjcp

On Fri, Jul 31, 2015 at 07:18:10AM +0200, J\ufffdr\ufffdme jeromestpierre@... [CZsynth] wrote:
> Hi there,
> 
> I also had a noise issue on my CZ-1 that I fixed by changing the relay. I don't know much in electronics but I found an article explaining that almost all noise issues on the CZ line are caused by this relay, which is not manifactured anymore, but there is another replacement that I installed successfully.
> 
> Here is the article: http://youthvulture.blogspot.fr/2013/11/casio-cz-1-relay-replacement.html?m=1
> 

Yeah, it's far more likely to be the muting relay.  Just get rid of it.

-- 
Gordonjcp MM0YEQ

Re: [CZsynth] Help with CZ-1000 dac offset adjustment

2015-07-31 by Paul

You can also easily clean the relay. There are videos out there showing how.
  PT

Sent from my iPhone
Show quoted textHide quoted text
> On Jul 31, 2015, at 6:31 AM, "Gordonjcp gordon@... [CZsynth]" <CZsynth@yahoogroups.com> wrote:
> 
>> On Fri, Jul 31, 2015 at 07:18:10AM +0200, Jérôme jeromestpierre@... [CZsynth] wrote:
>> Hi there,
>> 
>> I also had a noise issue on my CZ-1 that I fixed by changing the relay. I don't know much in electronics but I found an article explaining that almost all noise issues on the CZ line are caused by this relay, which is not manifactured anymore, but there is another replacement that I installed successfully.
>> 
>> Here is the article: http://youthvulture.blogspot.fr/2013/11/casio-cz-1-relay-replacement.html?m=1
> 
> Yeah, it's far more likely to be the muting relay.  Just get rid of it.
> 
> -- 
> Gordonjcp MM0YEQ
> 
> 
> 
> ------------------------------------
> Posted by: Gordonjcp <gordonjcp@...>
> ------------------------------------
> 
> 
> ------------------------------------
> 
> Yahoo Groups Links
> 
> 
>

Re: Help with CZ-1000 dac offset adjustment

2015-08-01 by Daniel Boles

Crackling at high mixing levels, and with the fairly soft profile that you mentioned, is more likely to be a problem with analogue amplifiers or muting circuitry, not the DAC. I've had this loads of times with bad muting transistors (somehow, due to bad luck I guess) and read about similar issues others have had with relays.

A dodgy DAC would be more likely to produce harmonically distorted sounds or hard digital clipping/glitches.

I doubt the white noise floor will be altered by either (aside from during the pre-boot, muted stage).

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