I bought a used HD-1. I've been frustrated Because the kick pedal on my Roland HD-1 only functions intermittently. I listed the HD-1, but I was not satisfied with the reliability of the pedal. First remove the four phillips screws and one hex screw:
Lubricate the areas marked in red with little Vaseline or a drop of oil. Clean the trigger with contact spray cleaner. To give more power to the pedal can add a rubber band on the spring, marked in yellow. Enjoy yourself !
Thanks to Jon Bondy\’s site at http://jonbondy.wordpress.com/2012/06/24/fixing-the-roland-hd-1-kick-pedal/ for tricks and photos.