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Usual cause is either spillage or impact to the flash unit. Most spillage is on the two flash pivots. Pull on top cover when it is attempting to go up to free it and remove the screws underneath and pry off the flash cover. You can now reach the pivot screw (many times rusted - remove, scrape off rust, and put on grease and re-install). BE VERY CAREFUL. THERE IS 300 VOLTS ACROSS THE FLASH TUBE AND YOU CAN GET A NASTY SHOCK!!!!
Usually caused by sticky liquid spillage around the pivots of the flash or impact. If liquid, manually pull up on the flash when it clicks to free the flash, and then remove the three screws holding the flash cover. On the right side is a spring with a screw inside it. Carefully remove the screw and check for rust. You can scrape off the rust with an Xacto knife and then clean the hole with a Qtip with Windex, then put some grease or Vaseline on the screw and see if the flash moves smoothly. Also clean off the flash and base with the Qtip and Windex to get rid of any sticky liquid.
Be very very careful! There is 300 volts across the flash tube!!! Do not touch the flash tube where the wires are soldered to it!!!!!
Sounds like the flash tube is bad. Another possibility would be a bad flash capacitor or circuit. Has the camera been impacted - especially around the flash? Another possibility is that the light tube that goes from the frame around the tube to the sensor further back in the flash base has come loose or impact has broken the frame. Pop up the flash. Underneath there are two screws; remove the screws, push the flash back down and using a slim piece of metal pop off the flash cover. You can then see the tube and the light pipe (looks like a thick black wire) and the sensor located at the back on the right. Be very careful. There can be over 300 volts across the flash tube - do not touch!!!
The air motor on the 285B needs to be oiled, the hammer section needs to be greased. The symptom described could be in the hammer mechanism, 285B's have 2 different side plates (item# 41) that sit atop the hammer mechanism, tools made from 2005 to 2007 use the old style side plate (item# 41) that has a small lip that need to sit looking toward the hammer case bushing (item# 44) when installed with the small lip facing in to the hammer will cause it to lock, tools made from 2008 to the present have a side plate that is flat on both sides and can be installed in either position. also check the hammer and anvil for cracks and pitting.
Follow this link to view the parts list. http://manualarchive.ingersollrandproducts.com/ir_pdfs/Tools/Vehicle%20Service%20Tools/Air%20Impact%20Tools/80162944.pdf
Mine is getting fuel, but it still clicks off like the original post stated, and its clean. The only other thing .. that water in the tubing. We get a TON of watered fuel here in Alaska! Damn oil venders.