Vintage Synth Repair

This is 1995 or 1996 vintage digital Pno. When performing it 
occassionally produces a "loud burst of sound." The key(s) making the 
sound are not always the same. Any ideas?
Thanks Humphries

Could be intermittent bad key contacts or the rubber contact strips breaking
down and developing cracks, or it could be something in one of the keyer
microprocessors going flaky. How creative are you in trying new things?
Keith Niver certified MITA tech.

-----Original Message-----
From: hump3dc [mailto:hump3dc@...] 
Sent: Monday, May 19, 2003 7:20 AM
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] Technics PR-500 Digital Piano


This is 1995 or 1996 vintage digital Pno. When performing it 
occassionally produces a "loud burst of sound." The key(s) making the 
sound are not always the same. Any ideas?
Thanks Humphries


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Kieth Niver:
Thanks for the response. I am comfortable in opening up the piano and 
making repairs/adjustments, etc. Suggestions?
Humphries

"How creative are you in trying new things?"

Keith, I am willing to try anything you suggest. I am comfortable 
making simple repairs, etc. I do not have electronic testing 
equipment but willing to purchase if necessary. My last "repairs" 
were to a Thomas Organ in the 80's and was successful. Thank you for 
any suggestions. Humphries.

--- In vintagesynthrepair@yahoogroups.com, "Keith Niver" 
<kaniver@m...> wrote:
> Could be intermittent bad key contacts or the rubber contact strips 
breaking
> down and developing cracks, or it could be something in one of the 
keyer
> microprocessors going flaky. How creative are you in trying new 
things?
> Keith Niver certified MITA tech.
> 
> -----Original Message-----
> From: hump3dc [mailto:hump3dc@y...] 
> Sent: Monday, May 19, 2003 7:20 AM
> To: vintagesynthrepair@yahoogroups.com
> Subject: [vintagesynthrepair] Technics PR-500 Digital Piano
> 
> 
> This is 1995 or 1996 vintage digital Pno. When performing it 
> occassionally produces a "loud burst of sound." The key(s) making 
the 
> sound are not always the same. Any ideas?
> Thanks Humphries
> 
> 
> ------------------------ Yahoo! Groups Sponsor ---------------------
~--> Get
> A Free Psychic Reading! Your Online Answer To Life's Important 
Questions.
> http://us.click.yahoo.com/Lj3uPC/Me7FAA/uetFAA/QnLolB/TM
> --------------------------------------------------------------------
-~->
> 
> To unsubscribe from this group, send an email to:
> vintagesynthrepair-unsubscribe@egroups.com
> 
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Well, the first thing I would probably check would be the key contact
strips, but if it's different notes causing the problem, it could be bad
solder connections on the plugs from the keyboard to the main board or
scanner board. It would mean getting the keyboard loose so you could flip it
over and do some checking on it and also pulling out at least of the keys to
check the rubber key contact strips, usually 12 note strips. I would
probably pull out a dozen or so keys, remove the contact strips, clean the
strips and carefully clean the board, check the solder connections on the
plugs and reinstall the strips and keys and check things. Also, does it seem
like every one or two of a group of six or eight notes makes the problem? If
so, it sounds like a possible scanner IC problem. Do you have a service
manual?

Keith Niver

-----Original Message-----
From: Humphries [mailto:hump3dc@yahoo.com] 
Sent: Sunday, June 08, 2003 8:23 AM
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] Re: Technics PR-500 Digital Piano


"How creative are you in trying new things?"

Keith, I am willing to try anything you suggest. I am comfortable 
making simple repairs, etc. I do not have electronic testing 
equipment but willing to purchase if necessary. My last "repairs" 
were to a Thomas Organ in the 80's and was successful. Thank you for 
any suggestions. Humphries.

--- In vintagesynthrepair@yahoogroups.com, "Keith Niver" 
<kaniver@m...> wrote:
> Could be intermittent bad key contacts or the rubber contact strips
breaking
> down and developing cracks, or it could be something in one of the
keyer
> microprocessors going flaky. How creative are you in trying new
things?
> Keith Niver certified MITA tech.
> 
> -----Original Message-----
> From: hump3dc [mailto:hump3dc@y...]
> Sent: Monday, May 19, 2003 7:20 AM
> To: vintagesynthrepair@yahoogroups.com
> Subject: [vintagesynthrepair] Technics PR-500 Digital Piano
> 
> 
> This is 1995 or 1996 vintage digital Pno. When performing it
> occassionally produces a "loud burst of sound." The key(s) making 
the 
> sound are not always the same. Any ideas?
> Thanks Humphries
> 
> 
> ------------------------ Yahoo! Groups Sponsor ---------------------
~--> Get
> A Free Psychic Reading! Your Online Answer To Life's Important
Questions.
> http://us.click.yahoo.com/Lj3uPC/Me7FAA/uetFAA/QnLolB/TM
> --------------------------------------------------------------------
-~->
> 
> To unsubscribe from this group, send an email to: 
> vintagesynthrepair-unsubscribe@egroups.com
> 
>  
> 
> Your use of Yahoo! Groups is subject to
http://docs.yahoo.com/info/terms/



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