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Technics KN800

Technics KN800

2009-04-04 by letcista

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.
José.
Portugal

RE: [vintagesynthrepair] Technics KN800

2009-04-04 by Brian Davies

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.
José.
Portugal

RE: [vintagesynthrepair] Technics KN800

2009-04-04 by Jose Pereira

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: sábado, 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.
José.
Portugal

RE: [vintagesynthrepair] Technics KN800

2009-04-04 by Kaniver

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
Show quoted textHide quoted text
--------- 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


________________________________________________
Message sent using MHCable.com WebMail 2.7.10

RE: [vintagesynthrepair] Technics KN800

2009-04-04 by Jose Pereira

Hello Keith.
Thanks for the info. I’ll try that.
When I access the Initialization page on the Memory & Control menu the keyboard doesn’t assume the initialization command.
The strange thing here is that even internal sounds ROM and rhythms seems scrambled and some times, after selecting some settings of sounds the keyboard starts playing by it self like it is scanning thru all the sounds it can produce.
Very strange…
I’ll try the hard reset and will pass info to the group.
Best regards.
José.
Portugal
 
  _____  

De: vintagesynthrepair@yahoogroups.com [mailto:vintagesynthrepair@yahoogroups.com] Em nome de Kaniver
Enviada: sábado, 4 de Abril de 2009 18:27
Para: vintagesynthrepair@yahoogroups.com
Assunto: RE: [vintagesynthrepair] Technics KN800
 
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
Show quoted textHide quoted text
--------- Original Message --------
From: vintagesynthrepair@ <mailto:vintagesynthrepair%40yahoogroups.com> yahoogroups.com
To: "vintagesynthrepair@ <mailto:vintagesynthrepair%40yahoogroups.com> yahoogroups.com"
<vintagesynthrepair@ <mailto:vintagesynthrepair%40yahoogroups.com> 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’t have the info on which keys I have to press at start up to
reset the machine.
Best regards,
Jose
Portugal

De: vintagesynthrepair@ <mailto:vintagesynthrepair%40yahoogroups.com> yahoogroups.com
[mailto:vintagesynthrepair@ <mailto:vintagesynthrepair%40yahoogroups.com> yahoogroups.com] Em nome de Brian Davies
Enviada: s�bado, 4 de Abril de 2009 12:05
Para: vintagesynthrepair@ <mailto:vintagesynthrepair%40yahoogroups.com> 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@ <mailto:vintagesynthrepair%40yahoogroups.com> yahoogroups.com
[mailto:vintagesynthrepair@ <mailto:vintagesynthrepair%40yahoogroups.com> yahoogroups.com] On Behalf Of letcista
Sent: Saturday, 04 April 2009 10:29
To: vintagesynthrepair@ <mailto:vintagesynthrepair%40yahoogroups.com> 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�.
Portugal

________________________________________________
Message sent using MHCable.com WebMail 2.7.10

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