Roland FD-8 Hi-Hat Control Pedal

[mcaki]

Hello!

I'm trying to fix my Roland FD-8 Hi-Hat Control Pedal (FD-8 :: Products :: Roland). It simply doesn't respond. I need some help to identify what is the trigger componet so I can replace it. Is it a hall effect sensor?

The manual says that "it provides open, closed, and half-open sounds and continuous control from full open to closed positions for richly expressive hi-hat work". In this way it can't be just a on/off sensor. Does it work as a potentiometer? If so, what is the impedance? Where can I by it?

Pictures attached.
Thank you!

[Jazz P Bass]

Most drum heads utilize a piezo sensor.
In the case of the HiHat controller, it appears that Roland utilizes a film variable resistor and a rubber finger.
Something such as this would have to be purhased directly from Roland.

[mcaki]

Thank you!

[Bruce / Mission Amps]

Roland has replaced odd TD parts for me at very reasonable prices..... so I'd ask and see what happens before trying to figure it out the hard way.

[Jazz P Bass]

Here is a pic of the sensor from an FD-7. The FD-8 is similar.

[mcaki]

Bruce, unfortunately here in Brazil Roland prices are prohibitives! Not to mention the delay...
Jazz P Bass, do you know where can I buy one of these?

[diydidi]

Hi. I'm an authorised Roland service center.
There is an upgrade kit for this pedal. Contact your local Roland guys for it.

[Jazz P Bass]

It may be wise to prove that the sensor itself is at fault.

Here is a well written blog on the FD-7/8, explaining how the sensor operates & most importantly, what resistance measurements to expect.

Link: Fun with Resistive Position Sensors ? Dr. Joan Bushwell's Chimpanzee Refuge