It's just a piece of glass. I don't think it's expensive at all. DoD, did they have copy machines in the 1930's? My high school had several, did yours?
Lol... say that the next time you have to replace bathroom mirrors or windows on a house. Seriously, man, have you at least tried calling a copier repair place or the manufacturer of the copier. You would think they'd know how much the part costs a bit better than 99.9% of the folks on here. That would kind of be common sense, but then I'm guessing I'm expecting too much out of you.
Basic Maintenance Procedures : Before proceeding ! ...Please read Basic Copier Operation explained. 1-Open machine, and locate the drum so as you Do Not Touch It! (any fingerprints, scratches, pin holes, or nicks may ruin this costly part). 2-Carefully lightly brush and vacuum loose toner and dust from all accessible areas inside of the machine. Be careful to keep vacuum nozzle at least 2 inches away from delicate electronic components and circuit boards. Any static electricity may damage these sensitive components. 3-Locate and carefully remove the Corona Charge Wire Assemblies (typically 3 to 4 assemblies). Some Corona assemblies have a retaining screw. These Corona Chargers drastically affect copy quality when they are not perfectly clean. They may appear clean, but still may be soiled. Use a can of Compressed Air, blow toner residue away from Corona insulator block assembly. Next take a Q-Tip moistened with Isopropanol and wipe wires clean. Some pressure may be applied with the Q-Tip, but be careful as not to break these delicate wires. For wires that are still soiled/dis-colored and not "squeaky clean" use special Corona Scour Strips (provided in CopyTech Kit). Next reinstall Corona assemblies being careful not to damage the Drum. 4-Locate and clean heated Fuser Rollers in paper exit area of machine. Make sure the upper and lower rollers are allowed to fully cool before cleaning with an Isopropanol soaked cloth. Rotate rollers and clean residue. If rollers are found to have wear or are scratched have them replaced. Worn rollers will cause poor copy quality and paper wrinkling or jamming. While cleaning rollers notice Paper Pickoff Fingers that contact the rollers, clean the hardened toner buildup from the underneath side that contacts the roller. Clean with fingernail or other suitable means. 5-Clean Paper Feed Tires (cassette area) and rubber drive rollers (inside machine) if they are easily accessible. Clean with a cloth moistened with Rubber Rejuvenator. Over time these tires/rollers will become glazed and hardened causing frequent paper jams. 6-Clean Copyboard Glass with Anti-static Glass Cleaner and paper towels. For stubborn residue scrape copyboard glass with single edged razor blade then clean again. If you feel capable, remove copyboard glass and lenses cover, clean all optical mirrors and lenses with anti-static glass cleaner only. Also you may want to slide the scanner/exposure lamp assembly (noting it’s home position) to reveal all of the optical mirrors for cleaning. 7-Lubricate Scanner shafts, Lens shafts, slide rails, and pads. Use a small amount of lightweight machine oil for lubricating scanner and lens shafts. Place a small amount of white lithium lube on slide rail contact areas and pads. 8-Clean ADF Belt or Copyboard Pad with Special Belt / Pad Cleaner. Clean with a cloth moistened with Cleaner. Do not use other cleaners for they will most likely not clean properly and or cause damage to the ADF Belt. The Belt / Pad Cleaner is formulated to remove ink / toner stains and prevent unnecessary background when you perform reduced sized copies from the original. 9-Spray general cleaner on cloth and wipe exterior of machine clean. 10-Plug in machine and run 30 test copies. 11-Make copy quality adjustments according to your manual or Service Sheet. 12-If the copy quality is still poor, see Basic Trouble Shooting Guide. 13-Send a Check to for $85 Payable to : mr_oily(Just Joking!).
I don't know the thickness of the glass, so a glass/mirror shop might be able to replace it for you. Since it is an older machine, it is possible that somebody has a few dead machines in a warehouse that are being cannibalized for their parts. Even if the machine is a sightly different model, the glass might have the same dimensions as your machine. Mango
