3M 2100 Service Manual

Also see for 2100: Illustrated parts breakdown

Contents

3M 2100 Service Manual Manual pdf 14 page image

9/92 4-1MODEL 2100 OVERHEAD PROJECTORGENERALThe following section describes theadjustments that will be necessary to servicethe Model 2100 (4100) Overhead Projectors.TOOLS REQUIREDA. Screwdriver (standard & phillips)B. Wrench, open endC. Pliers, standardD. Pliers, grip ringE. SquareF. Torx Driver, #T-15 (for removal of stageglass) 3M Part Number 26-1005-8317-3PROJECTOR CHECK-OUT FACILITIESReliable check-out and optical alignment of theoverhead projectors can be accomplished onlyif proper facilities are available. (see Figure)This requires a permanent viewing screen andtest stand in the dealer’s shop, thus enablinghigh check-out standards to be established andmaintained. Service personnel will also find thatthe use of permanent test facilities will assure abetter check-out job in considerably less timethan otherwise would be required.Only two low-cost items are required to provideproper check-out facilities: a test viewingscreen, 60 by 60 inches, with a flat (non-reflective) white surface; and a bench or teststand permanently located about 8 feet fromthe screen.The screen should be vertical and can mosteasily be provided by applying a flat white paintto a 60 by 60 inch area of a smooth wall. If asmooth wall is not available, a piece ofwallboard painted flat white, or a white windowshade of the proper size, can be mounted inthe selected area.The test stand should be high enough toprovide easy access to all parts of theOverhead Projector when the projector isplaced on the stand for check-out. An electricaloutlet and a switch should be built into the teststand to facilitate making electrical connectionsto the projector.The following steps provide a simple procedurefor setting up the permanent test facilities. It isparticularly important that the projector beperfectly square with the viewing screen inorder to eliminate the possibility of vertical orhorizontal keystoning. Even the slightestkeystoning will result in unequal focusing of theprojected image at the four corners, and willespecially affect resolution readings.Therefore, several of the following steps involvesquaring the projected light with the screen.Permanently locating the test stand andviewing screen will assure that the properrelationship, once established, does notchange.(Continued on the next page)SECTION 4 ADJUSTMENTSArrangement of Check-out Area