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Boss DR-110 Drum Machine - Slight noise in output
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Aaron



Joined: Nov 08, 2012
Posts: 4
Location: Phoenix, AZ

PostPosted: Thu Nov 08, 2012 12:55 pm    Post subject:  Boss DR-110 Drum Machine - Slight noise in output Reply with quote  Mark this post and the followings unread

Hi all, this is my fist post here.

I just acquired a Boss DR-110, and the output is a little noisy, at least to my ear. When you have the headphones in and just listen for awhile (with no pattern playing), you will occasionally hear a little pop or two, just a little bit of noise (there's also a constant and very mild hiss, but I don't mind that). The noise happens sporadically, and it's rather quiet, but you can sometimes hear it during playback.

As an aside, I should note that before I could even use the machine, I had to re-solder the joints connecting the headphone jack to the PCB. When I got it, you had to wiggle and hold the headphones at a certain angle just to get any sound out of the jack. I figured that cold or broken solder joints were the problem, and I was right. But I've also got this noise problem. I don't know, however, whether the noise existed before I fixed the headphone jack.

Any idea why I'm getting the intermittent noise described above? Any suggestions you can offer would be appreciated.

Thanks!

Aaron

Last edited by Aaron on Thu Nov 08, 2012 1:32 pm; edited 1 time in total
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Blue Hell
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Joined: Apr 03, 2004
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Location: The Netherlands, Enschede
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PostPosted: Thu Nov 08, 2012 1:12 pm    Post subject: Reply with quote  Mark this post and the followings unread

welcome Aaron

1980 .. might just be a lil noisy by nature?

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Aaron



Joined: Nov 08, 2012
Posts: 4
Location: Phoenix, AZ

PostPosted: Thu Nov 08, 2012 2:22 pm    Post subject: Reply with quote  Mark this post and the followings unread

Blue Hell wrote:
welcome Aaron

1980 .. might just be a lil noisy by nature?


Thanks for the welcome, Jan. Yes, I've considered that possibility, but I'd like to hear from DR-110 owners. Perhaps I have a bad cap or something in the output section? Anyway, I can read a schematic and I'm pretty handy with a soldering iron, so I'm ready to tackle it, if need be. Very Happy

Aaron
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Aaron



Joined: Nov 08, 2012
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Location: Phoenix, AZ

PostPosted: Thu Nov 08, 2012 6:50 pm    Post subject: Reply with quote  Mark this post and the followings unread

Well, today I replaced the electrolytic capacitors in the little headphone-amp circuit (C64, C65, and C68). I was going to change the amp chip, too, but as it turns out, I have one of the later serial numbers that uses a different one than is shown on the schematic. The schematic shows LM386N-1, but mine uses M50501L. The latter is apparently pretty exotic (or just obsolete) because it's hard to find on the Internet. OTOH, I found an LM386N-1 at Radio Shack! Laughing I also unsoldered and resoldered the headphone jack, just in case there were any bad solder joints.

Anyway, none of these steps helped. Still getting the noise through the headphone jack. As it turns out, though, the signal is very clean and quiet through the 1/4" output jack. I ran it through an amp tonight and it sounded great. Since I'll use that jack to record anyway, I suppose it doesn't matter about the headphone jack. But I'd still like it to work properly. Cool

Still welcoming any ideas on the noisy headphone jack!

Aaron
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Blue Hell
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PostPosted: Fri Nov 09, 2012 3:55 am    Post subject: Reply with quote  Mark this post and the followings unread

[quote="Aaron"Anyway, I can read a schematic and I'm pretty handy with a soldering iron[/quote]

Sure looks like that Cool

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grenert



Joined: Mar 08, 2014
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PostPosted: Mon Aug 17, 2015 10:02 am    Post subject: Reply with quote  Mark this post and the followings unread

I know this is a very old thread, but for the sake of adding a little information on the internet regarding the headphone out, my DR-110 is also noisy/buzzy from the headphone out. My version has the M50501L headphone amp. Not sure if replacement by LM386 would help, but it would be a royal pain, because the M50501L is a SIP package.

So, this seems to be normal, at least for the later models with M50501L headphone amps.
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Aaron



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Location: Phoenix, AZ

PostPosted: Mon Aug 17, 2015 10:56 pm    Post subject: Reply with quote  Mark this post and the followings unread

grenert wrote:
I know this is a very old thread, but for the sake of adding a little information on the internet regarding the headphone out, my DR-110 is also noisy/buzzy from the headphone out. My version has the M50501L headphone amp. Not sure if replacement by LM386 would help, but it would be a royal pain, because the M50501L is a SIP package.

So, this seems to be normal, at least for the later models with M50501L headphone amps.


Thanks for adding this info. I just pulled out my DR-110 to see how I felt about the noise in the headphone jack. Three years after my original post -- and having had a lot more experience with analog gear -- I find that the noise level is acceptable. I mean it's analog, it's 30 years old, and it wasn't a super high-end piece to begin with. You live and learn, huh? Very Happy
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Paradigm X



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PostPosted: Tue Aug 18, 2015 2:34 am    Post subject: Reply with quote  Mark this post and the followings unread

Recapping the PSU should have a beneficial effect. May as well replace all electrolytics.
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