Vintage Synth Repair

The reset is to hold down Pad 1, 2, 3, and power up. You can also access
this from the Memory & control, page 2.

Keith Niver
Certified MITA Tech

--------- Original Message --------
From: vintagesynthrepair@yahoogroups.com
To: "vintagesynthrepair@yahoogroups.com"
<vintagesynthrepair@yahoogroups.com>
Subject: RE: [vintagesynthrepair] Technics KN800
Date: 04/04/09 11:01

Thanks for the info Brian.
Which model was that Technics?
I also don\u2019t have the info on which keys I have to press at start up to
reset the machine.
Best regards,
Jose
Portugal




De: vintagesynthrepair@yahoogroups.com
[mailto:vintagesynthrepair@yahoogroups.com] Em nome de Brian Davies
Enviada: s\ufffdbado, 4 de Abril de 2009 12:05
Para: vintagesynthrepair@yahoogroups.com
Assunto: RE: [vintagesynthrepair] Technics KN800

Hi Jose

I had a similar problem on a Technics recently.  Fortunately I had a service
manual and was therefore able to put it right.  In my case memory backup was
achieved by a nickel cadmium battery that had failed.  In this case there
was a mistake in the circuit in that no means of charging the battery had
been made.  So after replacing the battery for NiMH and adding a couple of
components to ensure that the battery would charge up, the manual said leave
the keyboard on for at least an hour and then reset it by turning off the
mains power, hold down three specific key in the rhythm section and then
switch the mains power back on.  This worked just fine.  Probably your unit
needs similar resetting.

Regards
Brian G3OYU
www.g3oyu.co.uk




From: vintagesynthrepair@yahoogroups.com
[mailto:vintagesynthrepair@yahoogroups.com] On Behalf Of letcista
Sent: Saturday, 04 April 2009 10:29
To: vintagesynthrepair@yahoogroups.com
Subject: [vintagesynthrepair] Technics KN800

Hello:
I'm trying to solve a problem with an old KN800 from Technics.
The owner left it stored for aboiut two years.
When he turned it on there's no message in the display and the keyboard
produced no sound.
The internal memory is keep with a capacitor 1 Farad 5,5 Volt in place of
the normal litium battery.
I replaced the capacitor, gave it a charge for several hours.
Now the keyboard starts up with the regular message on the display but seem
that the memory is all scrambled with strange messages in the display and
the sound is kind of random.
My questions are:
- Does anyone have deal with a similar problem?
- Does anyone have a pdf version of the service manual?
- Does anyone know how to make a hard reset to the machine?

Any help will be appreciated.
Best regards.
Jos\ufffd.
Portugal


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