SOURCE: toothed belt bosch 1274 dvs
If I am correct, when holding the tool in the normal operating position there should be an oblong cover on teh left hand side nea the back of the tool. It should be held on with a screw. remove this cover and you can access the belt . MAKE SURE THE TOOL IS UNPLUGGED. the belt should pull off/push on with a bit of force. Turning the pulleys as you put it on will help it go on evenly. If it is too stiff, put the belt in some boiling water for a minute or two to soften it up a bit.
SOURCE: Bosch 3 x 21 Belt Sander
Remove the dust bag and unplug sander for now. Everywhere you see an access hole (fan area, dust port, back of sander blow thru the tool to remove lodged dust that clogged the system, Also look for broken belt pieces in the back of sander. Then while running (remove belt) blow again thru all the ports to try and reomve as much contamination as possible. When finished you can feel to see if air coming from dust bag port, it not you still have a clog that might need more work. If I have clarified your request would you please rate this response accordingly and thank you.
SOURCE: My Bosch 1276 DVS belt
that is possible, but was the tool operating properly first?? unplug tool and check the cord for any breaks, then what I would do is clean the tool as good as possible with compressed air and if you can remove the brush caps do so and check the condition of the spring and clean the area. DO NOT sand the brushes but look across the face to see if both look worn evenly. If you have a volt ohms meter check from the plug to the brush holder with the switch on brushes removed to see if you have continuity and if not then I would have to think the switch
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