ms70 cdr low volume on left (mono) channel

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b3nway
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ms70 cdr low volume on left (mono) channel

Post by b3nway » Thu Jul 07, 2016 4:36 pm

Hello to everyone!
I recently bought (brand new) my first pedal effect, the Zoom MS-70CDR.
I find this little zoom very useful, versatile and well designed but I have a problem: the output volume (MONO) is very low.
Also in bypass mode the output signal is low.

But I have discovered that only the left channel is affected by this problem :-(
This is a common issue?

Thanks in advance.
Giorgio.
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NucleusX
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Re: ms70 cdr low volume on left (mono) channel

Post by NucleusX » Fri Sep 16, 2016 8:44 pm

It could be the way you've set up your FX chain and cables. If your running in mono via the L input and place
a stereo effect first in your chain, the inputs won't sum, and you shouldn't hear much of a signal from the R
output, but you will hear some bleed through at a lower volume depending what FX are in use. Only way around
this is either using both L and R inputs and summing to mono before the pedal with a mono Y/insert cable, or
place a mono effect first in your chain so your inputs sum to mono that way. Although, being that this still happens
in bypass mode, I'm thinking your problem will most likely be in your input/output cables, assuming the pedal
isn't defective of course. More information on how its connected to the rest of your rig would help.
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George L
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Re: ms70 cdr low volume on left (mono) channel

Post by George L » Sun Oct 01, 2017 1:09 pm

hello everyone!
I know this is old but I have the same problem
brand new pedal (ms70 cdr) L (mono) input is reducing volume approximately 30% even with all the zoom fx disabled
tried only guitar, pedal and amp. I tried different cables
if i use R input and R output everything is ok normal volume
my question is is it ok to use R input and R output for mono
I don't care for stereo
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b3nway
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Re: ms70 cdr low volume on left (mono) channel

Post by b3nway » Sun Oct 01, 2017 2:19 pm

Hi George!
Yes I confirm that the sound is attenuated as you have described.
Could you kindly provide me with your serial NO.?
Mine is 015358

Anyway, at this conditions the Signal/Noise ratio it's unacceptable.
After a lot of testing, I'm supposing It's an electrical defect.
More in detail, I suspect a issue in the analog buffer, just before the AD section in the audio chain.
Fixing this issue is a time-consuming process and I need to focus all my efforts on playing guitar.
So my brand new pedal ms70 cdr lies unused after one year.
And ... It's frustrating, of course!!! :-(

Thanks.

Giorgio.
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George L
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Re: ms70 cdr low volume on left (mono) channel

Post by George L » Sun Oct 01, 2017 3:51 pm

mine is 023454
I don't care for stereo mode is it ok to use R input and R output in mono mode?
thanks for the quick response
George
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stubbsonic
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Re: ms70 cdr low volume on left (mono) channel

Post by stubbsonic » Mon Oct 02, 2017 12:10 pm

I don't think this is normal behavior. If it was, we'd see more posts on this forum and even this thread with "Me too!"

Only the L in/out sum to mono, so if you use R and R you will be getting the right side of a stereo signal. Even if you don't care about stereo, you won't be getting the intended mono sound. MIght be sufficient for your needs, but you won't be getting the same quality from choruses, reverbs and delays. If you REALLY don't want to deal with customer service you can live with it, but I would get it taken care of while you can.

Return it for an exchange.
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gila_crisis
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Re: ms70 cdr low volume on left (mono) channel

Post by gila_crisis » Thu Oct 05, 2017 4:39 am

Hi,
I've bought a second hand MS70, for a friend (since I live pretty near the seller, so we avoided shipping) and it suffers the same issue!
It was originally bought new in 2016, and from what the seller told me, he barely used (it looks like new). I tryed to take a look inside, did a firmware upgrade and a total reset, but nothing helped. I suppose there's something faulty in the Left input buffer.
It is a shame... I have myself a MS70 and a MS100, which sometimes are brutally misused and abused too, but I never had any kind of issues with these 2.

Anyhow the seller agreed to take back the pedal and give the money back.
I've also wrote to Zoom and they quickly and kindly replied:

Thank you for your mail and thank you use ZOOM products.
About your mail
If it does not resolve even if factory reset is done, the cause seems to be a breakdown of the left INPUT.
You need to repair.
Please contact to our distributor in your country.
Please find out our distributor in your country below list.
https://www.zoom.co.jp/distributors
All best
ZOOM Support
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b3nway
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Re: ms70 cdr low volume on left (mono) channel

Post by b3nway » Thu Oct 05, 2017 2:14 pm

Hi gila, hi George,
i have already inspected my unit and all seems ok.
Here is the internal view ( I have found this picture in the web ...)
Image.

On the left side there is a small board. I guess it plays a role of Preamplifier/buffer stage in the audio chain, just before the ADC input.
Next week I'll be able to inject a reference signal on both channels, in order to find any differences in the analog path.

If the problem is here,maybe the simplest solution could be swapping the channels.
( I don't care for stereo input)
I'll keep you updated on my progress.

Regards.
Giorgio.
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