Currently Being ModeratedJul 8, 2012 2:20 AM (in response to anelson86)Re: HD500 expression pedal not working properly
If you are certain that you have followed the calibration sequence correctly then you could do what this guy dd and clean the sensor. Beware of the potential warranty issues ... http://line6.com/support/message/350381#350381
Currently Being ModeratedJul 8, 2012 3:23 PM (in response to jimsreynolds)Re: HD500 expression pedal not working properly
Thanks for the suggestion. Instead of actually taking it apart I went ahead and used compressed air to blow down the hole where the sensor is. That didn't do anything and the problem is still happening. It's really weird that everything is ok for the first few minutes and then it gets messed up - it seems like it is maybe a software bug?
Currently Being ModeratedJul 8, 2012 5:04 PM (in response to anelson86)Re: HD500 expression pedal not working properly
Not beyond the realms of possiblity.
Suggest you re-flash (keeping presets) and then do a global settings reset and calibration.
- Global Settings Reset HD500.http://line6.com/support/docs/DOC-2222
- Expression Pedal Re-Calibration HD500 http://line6.com/support/docs/DOC-2223
Bear in mind that if there is some kind of sticky goop on the sensor that the air-jet may not clear it.
Currently Being ModeratedJul 8, 2012 6:24 PM (in response to jimsreynolds)Re: HD500 expression pedal not working properly
Tried the re-flash, global reset, and expression pedal calibration twice - no dice. During step 5 of the calibration the scaled pedal value only goes from 0 to about 70. Initially when it is put all the way to the toe position it pops up to 145, but then quickly goes to about 70 and wobbles around between 60 and 80.
I'm a bit leary to open the case up and do anything since it's probably still under warranty, so I may take it in to a service center this week.
Currently Being ModeratedJul 8, 2012 7:01 PM (in response to jimsreynolds)Re: HD500 expression pedal not working properly
So in lieu of popping off the whole back and removing the circuit board I decided to loosen the bolt of the pedal itself with the allen wrench that came with the board. I took the bolt out and the pedal off and then blew off the sensors again with an air can. They look completely clean - however, the white reflector on the bottom of the pedal that allows the sensors to work has a scratch right across the middle. Perhaps this is causing the problem? I'm thinking once the pedal gets to the right distance that scratch is right in line with either the light source or sensor and is causing the light to not be aimed back at the sensor, resulting in a mis-read of the position.
The only thing that this wouldn't answer is why it works for 1 or 2 minutes before getting messed up. Perhaps the light source is a laser diode (which it looks like) and takes a minute or two to settle into it's operating wavelength so the issue isn't immediately apparent.
Either way, I'm thinking I need to get a new reflector for the bottom of the pedal - not sure how that could have gotten scratched except from the factory.