*Virginia* electronic drum machine repair anyone? (edited)

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Someone from Florida Virginia contacted me after seeing my blog post about a repair to a Roland TD-6V electronic drum "brain".

Since I'm based in the UK, I can't help them as the shipping would be slow and expensive!

 

Anyone up to repairing it for them? The fault report is that it will not power on, but the external PSU is definitely delivering 12V.

That's all I know!

 

SpiderKenny
@spiderelectron
www.spider-e.com

 

Last Edited: Thu. Aug 25, 2016 - 12:36 PM
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My bet is on an electrolytic cap that is bloated!   Should be easy to spot and replace. 

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ki0bk wrote:

My bet is on an electrolytic cap that is bloated!   Should be easy to spot and replace. 

Yeah, the TD-6V also uses a big standard 78L05 with no heat sink, which gets pretty hot.

It'll one or both of those things most likely.

SpiderKenny
@spiderelectron
www.spider-e.com

 

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On any piece of eBay vintage electronic music equipment that I buy, I replace all 78L05 and 7805 modules with one of the little (2x3 cm) DC/DC switching step-down Buck Converter boards that sell on eBay for about $1.   On one MIDI tone module, substituting a switching regulator board  for a 7805 allowed the power to go from 13V/700mA (@10 Watts) to 5V/700mA (@3.5 Watts).   I could then use a wall-wart power supply instead of a stand-alone brick power supply.

 

  I recommend that everyone do this with any equipment that uses +5V in amounts greater than 100 mA.

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Do you have a link to the unit you buy/use/recommend?

 

Ross McKenzie ValuSoft Melbourne Australia

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http://www.digikey.com/en/produc...

 

http://uk.farnell.com/murata-pow...

 

http://hackaday.com/2016/02/15/b...

 

 

These have been discussed here in the past.  Some of us like them, others not so much.

 

Jim

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

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Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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Yes Jim, I am aware of those. Was particularly interested in Simonetta's $1 eBay units. Sorry I wasn't clear enough.

Ross McKenzie ValuSoft Melbourne Australia

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valusoft wrote:
Was particularly interested in Simonetta's $1 eBay units

Missed that as well.  Best I could get them was $3.00 each on Ebay.

 

Jim

I would rather attempt something great and fail, than attempt nothing and succeed - Fortune Cookie

 

"The critical shortage here is not stuff, but time." - Johan Ekdahl

 

"Step N is required before you can do step N+1!" - ka7ehk

 

"If you want a career with a known path - become an undertaker. Dead people don't sue!" - Kartman

"Why is there a "Highway to Hell" and only a "Stairway to Heaven"? A prediction of the expected traffic load?"  - Lee "theusch"

 

Speak sweetly. It makes your words easier to digest when at a later date you have to eat them ;-)  - Source Unknown

Please Read: Code-of-Conduct

Atmel Studio6.2/AS7, DipTrace, Quartus, MPLAB, RSLogix user

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Some audio equipment really won't like switching regulators being used - especially cheap ones.

You might hear the switching noise in the audio outputs. In fact for Apple certification (MFi certification) if you are using a switching regulator at all it has to switch at >200 Khz, and you have to submit your device to spectrum analyzer tests on the power lines. If there are any peaks above a certain figure in the 0 to 20 Khz range your device will fail.

SpiderKenny
@spiderelectron
www.spider-e.com