Just Curious about some of the information you posted. I Have a dover HD-91 door operator that is giving me some issues. The problem is the door opens super super fast but does slow down before full open. Checked both door open slow downs both are working. If i hold the door open slowdown contact closed it acts correctly and the door opens slowly. Has 5 resistor tubes in controller
and R3 and R4 are involved with door open according to print. i adjusted both of them to the bottom of the resistor just to see if changed door open speed but did nothing. Ohmed out all resistor tubes in controller and all ohm out ok. I have not touched the resistor tube in the door operator yet. Have the door open slowdown jumped so door opens slowly for now. Im trying to figure out what controls the door open speed when first opens. Any help or ideas would be great. Thanks
