Roland D50 ignoring aftertouch

[Antix]

Hi ,

After years of sleep I powered on my Roland D50 .

It works fine...very fine but aftertouch ( from its keyboard ) do not responds. :no:

From MIDI aftertouch works normally so it is a keyboard sensors problem.

In the net i read that it is a common problem on some Roland products ( JD800,D50 )

and it is caused from resistor in the pressure sensor amplifier that change its value

in the years.

Is anybody experienced of this or knows a link useful for solving this problem? :console:

Best Regards

Antix

[Shuriken]

Hi ,

After years of sleep I powered on my Roland D50 .

It works fine...very fine but aftertouch ( from its keyboard ) do not responds. :no:

From MIDI aftertouch works normally so it is a keyboard sensors problem.

In the net i read that it is a common problem on some Roland products ( JD800,D50 )

and it is caused from resistor in the pressure sensor amplifier that change its value

in the years.

Is anybody experienced of this or knows a link useful for solving this problem? :console:

Best Regards

Antix

This maybe? http://www.bustedgear.com/repair_Roland_d50_key_contacts_2.html

[Antix]

Hi Shuriken,

Thank You for the answer but unfortunately I have not a contact problem.

Key Contact and dynamic works fine .

The problem is the aftertouch.

I am start to thinking that maibe useful a D50 schematic to see the zone of

aftertouch and make some measures.

Effectively if I push very hard on keys a very minimal sound variation exist.

At the end in my town is there a Roland service center but I'm sure they will

ask me a lot of money....so first I wont to try myself.

Regards

Antix

P.S. the site You indicate is fine

[Shuriken]

Here is the D50 Service Manual

It seems there is some people on electro-music.com who seem to know a lot about the D50 techically. Maybe you can try and ask there.

[Antix]

Yes, I will ask.

It seems that a lot of aftertouch sensors going to oxidize then a

good cleaning may solve the problem.

Thank for the link for the manual.

Regards

Antix

[Shuriken]

I noticed you fixed them today. So tell us your secret :ahappy:

[Antix]

Sorry for delay.

On the bender board I have resoldered cursors ( pot ) and other SMD and PTH.

The whole cause of malfunction was ( like old philips television ) a degradation of the PTH solderings.

You can see , with magnifyng lens , like a little darker circle in the soldering around the pin.

After resoldering pins of the cursors aftertouch starts ( restarts ) to work but I gave a little shot to all the soldering on this board.

Regards

Antix