Can't see anything through the lens on a Galeleo D76

The reason you cannot get the lens to do anything is because, as you yourself have stated, it is obstructed. If you remove the obstruction, the lens should function normally.

Which particular developer are you trying to make ? I find D76 works with most B&W films.

Try this :

Lens Error Fixya

Post voltages on R64/R61

then D68

then T44

and D76

Lens errors are fairly common. Usually it's sand or grit interfering with the lens extension mechanism. Or the camera's been dropped with the lens extended. Or the camera has been powered on, but the lens had been blocked preventing its extension. Or the battery ran down with the lens extended ... Unfortunately, many cameras that fall prey to this can only be corrected by professional repair. But, here are some things that you can do that may correct it. They only seem to work for less than 40% of the lens errors, but if the camera is out of warranty, they're worth a try.

Put the eyepiece with the LARGEST number written on it into the diagonal. DO NOT use the 2x barlow if you have one. Go out side during the day time and practice focusing on a distant object. Be sure the lens cap is off!

Read my frequently asked questions TIP on my profile page.

Is the lens aperture ring set to the "a" position?

Locate a local astronomy club and they will help you use the telescope.

i dont think you can do anything you just have to reffer to a proffessional because there are some gears that maybe damaged

Lens mechanism isn't good to work properly so camera shut down the power. Try to tap the lens/ camera while power up.
If you have a memory card in the camera, take it out before turning the camera on