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Author Topic: My beloved DSR112 not well  (Read 36959 times)

Ivan Beaver

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Re: My beloved DSR112 not well
« Reply #30 on: January 09, 2018, 07:39:58 am »

Can anyone recommend a good contact cleaner for this?
TV tuner cleaner is a general cheap fix that often works-except on pots-it dries them out.

The good stuff.  http://caig.com/   deoxit
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Debbie Dunkley

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Re: My beloved DSR112 not well
« Reply #31 on: January 09, 2018, 12:23:24 pm »

Likely multiple sets of contacts on the switch. Some affect the HF and some the LF.



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That would explain it - thanks Rob.
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Tim McCulloch

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Re: My beloved DSR112 not well
« Reply #32 on: January 09, 2018, 12:29:49 pm »

Can anyone recommend a good contact cleaner for this?

Other than to flush out lubricants and dielectric grease, shooting solvents through the front of a switch or potentiometer you generally only make a mess.

To clean the switch contacts you need access from the back or side of the switch, which means opening up the cabinet (and amp bucket on many models) to get to it,

I suspect more controls are damaged or have their service life shortened by misapplication of chemical cleaners than are "saved" with these chemicals.
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Debbie Dunkley

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Re: My beloved DSR112 not well
« Reply #33 on: January 09, 2018, 12:41:08 pm »

Other than to flush out lubricants and dielectric grease, shooting solvents through the front of a switch or potentiometer you generally only make a mess.

To clean the switch contacts you need access from the back or side of the switch, which means opening up the cabinet (and amp bucket on many models) to get to it,

I suspect more controls are damaged or have their service life shortened by misapplication of chemical cleaners than are "saved" with these chemicals.

The 'safest' thing to do in situations such as these might simply be to just move all switches and button on and off regularly not allowing them to remain in the same position for long periods of time. This is what the repair guy told me.
BTW... this guy has been repairing amps, speakers, mixers and keyboards for over 40 years and is the Yamaha, Allen Heath and many more brand authorized repair shop. He does all the repairs for Guitar Center in this area and probably every other music store round here. I have been using him for years for everything but JBL and have had excellent service from him. He is  also a computer and midi repair specialist and composes music - quite a guy ...
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A young child says to his mother, "Mom, when I grow up I'm going to be a musician." She replies, "Well honey, you know you can't do both."

Tim McCulloch

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Re: My beloved DSR112 not well
« Reply #34 on: January 09, 2018, 12:59:19 pm »

The 'safest' thing to do in situations such as these might simply be to just move all switches and button on and off regularly not allowing them to remain in the same position for long periods of time. This is what the repair guy told me.
BTW... this guy has been repairing amps, speakers, mixers and keyboards for over 40 years and is the Yamaha, Allen Heath and many more brand authorized repair shop. He does all the repairs for Guitar Center in this area and probably every other music store round here. I have been using him for years for everything but JBL and have had excellent service from him. He is  also a computer and midi repair specialist and composes music - quite a guy ...

Yep, exercising "wiping" contacts is how they get cleaned in normal use.  No move, no clean.

My comment was aimed at Steve G because while he's partly correct, without specifying a manner of application all one does is make a mess and the "treatment" will need to be repeated frequently.  Your technician is correct.

One of my IATSE sisters is an A1 at our PAC and she HATES telco-style patch bays because of issues with the normalizing contacts being intermittent.  No surprise, many of the jacks either don't get used or get used with the plugs remaining in the jack for long periods of time.  The city replaced the patch bays a couple of years ago and they work as they should, but she still doesn't like them or fully appreciate the flexibility in signal routing they provide.  At any rate, her issue is ultimately the lack of contact cleaning and maintenance, not the product itself.  As none of the stage hands are instructed by City policy to clean the jacks (nor the City provide the tools and chemicals), these replacement patch bays will fail, too.
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"Practicing an art, no matter how well or badly, is a way to make your soul grow, for heaven's sake. Sing in the shower. Dance to the radio. Tell stories. Write a poem to a friend, even a lousy poem. Do it as well as you possible can. You will get an enormous reward. You will have created something."  - Kurt Vonnegut

Debbie Dunkley

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Re: My beloved DSR112 not well
« Reply #35 on: January 09, 2018, 01:04:11 pm »

Yep, exercising "wiping" contacts is how they get cleaned in normal use.  No move, no clean.

My comment was aimed at Steve G because while he's partly correct, without specifying a manner of application all one does is make a mess and the "treatment" will need to be repeated frequently.  Your technician is correct.

One of my IATSE sisters is an A1 at our PAC and she HATES telco-style patch bays because of issues with the normalizing contacts being intermittent.  No surprise, many of the jacks either don't get used or get used with the plugs remaining in the jack for long periods of time.  The city replaced the patch bays a couple of years ago and they work as they should, but she still doesn't like them or fully appreciate the flexibility in signal routing they provide.  At any rate, her issue is ultimately the lack of contact cleaning and maintenance, not the product itself.  As none of the stage hands are instructed by City policy to clean the jacks (nor the City provide the tools and chemicals), these replacement patch bays will fail, too.

Out of respect, I should have also referred to my 'repair man' as a technician - he deserves that. My bad.
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Steve Garris

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Re: My beloved DSR112 not well
« Reply #36 on: January 09, 2018, 02:57:18 pm »

Yep, exercising "wiping" contacts is how they get cleaned in normal use.  No move, no clean.

My comment was aimed at Steve G because while he's partly correct, without specifying a manner of application all one does is make a mess and the "treatment" will need to be repeated frequently.  Your technician is correct.

One of my IATSE sisters is an A1 at our PAC and she HATES telco-style patch bays because of issues with the normalizing contacts being intermittent.  No surprise, many of the jacks either don't get used or get used with the plugs remaining in the jack for long periods of time.  The city replaced the patch bays a couple of years ago and they work as they should, but she still doesn't like them or fully appreciate the flexibility in signal routing they provide.  At any rate, her issue is ultimately the lack of contact cleaning and maintenance, not the product itself.  As none of the stage hands are instructed by City policy to clean the jacks (nor the City provide the tools and chemicals), these replacement patch bays will fail, too.

Twisting the knobs has always been my first approach, so I suppose I'll keep doing just that. Thanks for the info!
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Debbie Dunkley

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Re: My beloved DSR112 not well
« Reply #37 on: January 09, 2018, 03:44:29 pm »

Twisting the knobs has always been my first approach, so I suppose I'll keep doing just that. Thanks for the info!

I think if the speaker had gone off completely, it might have occurred to me at some point to  push, turn - generally mess with stuff  but the fact that the horn was still working threw me and I was convinced it would be an internal problem.
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Douglas R. Allen

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Re: My beloved DSR112 not well
« Reply #38 on: January 09, 2018, 08:12:26 pm »

I think if the speaker had gone off completely, it might have occurred to me at some point to  push, turn - generally mess with stuff  but the fact that the horn was still working threw me and I was convinced it would be an internal problem.

I looked into buying a set of the 12s and still may. When thinking of the switches in the back I wonder which switch would cause a woofer to stop working.  If a switch had the function of turning off/on the woofer I could see it. But a dirty switch would , I would think, only effect what the switch would normally do. No lowcut on the woofer in sub mode as an example. I'm not saying its not possible but it just seems odd. Did the repair person say which switch was the problem?

Douglas R. Allen
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Debbie Dunkley

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Re: My beloved DSR112 not well
« Reply #39 on: January 09, 2018, 08:28:39 pm »

I looked into buying a set of the 12s and still may. When thinking of the switches in the back I wonder which switch would cause a woofer to stop working.  If a switch had the function of turning off/on the woofer I could see it. But a dirty switch would , I would think, only effect what the switch would normally do. No lowcut on the woofer in sub mode as an example. I'm not saying its not possible but it just seems odd. Did the repair person say which switch was the problem?

Douglas R. Allen

Yes - the mic/line switch - which is actually a button. Chris picked it up today and didn't ask any questions so I might call him tomorrow just to be sure.
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