Mita DC-1205 Copier

If you need a manual for it try looking on line for older copiers. Since that unit was built back in the mid 80s.The other person that helped you on the toner is exactly right.

Open the front door... on the right is your toner. It is a cartridge that inserts long-ways (front to rear) into the machine, and should be white or ivory in color. DO NOT remove the old toner cartridge without having a replacement on hand. The new cartridge will have a plastic "cover" on it that assists in releasing the toner cartridge locking tab, and "seal" the old cartridge as you remove it from the copier. The cartridge opening is face down upon installation into the machine, and you may get some spillage if you remove it without the cover. DO NOT remove the new cartridges mylar seal until AFTER you install it in the machine!!! There should be a picture label inside the front cover showing how to replace the cartridge. And there is a pictorial diagram on each new toner cartridge box also detailing this.
Use only MITA DC 1205/1255/1415/1435/1455 toner, OEM #MTA37041013. Should run you about $12-$14 per cartridge retail, or cheaper if shopping around (I sell them for $11.99). Do not use copystar brand for the same equipment. Although it's the same toner, the shape of the cartridge is slightly altered, and may not "fit" into the machine. I forget how it goes, either Copystar will work in Mita, and not the other way around, or vice-versa. Either way, better safe than sorry.