I think the 930 was of the last ones where the user manual had illustrations on how to open the top of the machine, the top of the freearm comes off for oiling and cleaning. Lots of points to oil and places to clean. I think you unscrew the face plate to replace the light bulb. If you get one of those LED bulbs it's an advantage to have a type where at least some of the ligth diodes point down wards (some lamps have the bulb laying horizontally, and that makes a difference. I guess high Wattage LEDs will give more light regardless (like 7W and 10W).
The sparks and smoke could come from dust in the motor, and I have read it's rather common when having new carbon brushes fitted. They need time to run in and fit the copper parts on the part that turns in side there (can't remember what it's properly called lol). It's always nice to get a professional tune up on them, and with a service at $79, it's still the best bargain I have heard of in a long time
:- )
Last edited by Mickey2; 11-20-2016 at 08:14 AM.