Adjustments | 3M 2100 guide

MODEL 2100 OVERHEAD PROJECTOR

SECTION 4 ADJUSTMENTS

GENERAL

The following section describes the adjustments that will be necessary to service the Model 2100 (4100) Overhead Projectors.

TOOLS REQUIRED

A.Screwdriver (standard & phillips)

B.Wrench, open end

C.Pliers, standard

D.Pliers, grip ring

E.Square

F.Torx Driver, #T-15 (for removal of stage glass) 3M Part Number 26-1005-8317-3

PROJECTOR CHECK-OUT FACILITIES

Reliable check-out and optical alignment of the overhead projectors can be accomplished only if proper facilities are available. (see Figure)

This requires a permanent viewing screen and test stand in the dealer’s shop, thus enabling high check-out standards to be established and maintained. Service personnel will also find that the use of permanent test facilities will assure a better check-out job in considerably less time than otherwise would be required.

Only two low-cost items are required to provide proper check-out facilities: a test viewing screen, 60 by 60 inches, with a flat (non- reflective) white surface; and a bench or test stand permanently located about 8 feet from the screen.

The screen should be vertical and can most easily be provided by applying a flat white paint to a 60 by 60 inch area of a smooth wall. If a smooth wall is not available, a piece of wallboard painted flat white, or a white window shade of the proper size, can be mounted in the selected area.

The test stand should be high enough to provide easy access to all parts of the Overhead Projector when the projector is placed on the stand for check-out. An electrical outlet and a switch should be built into the test stand to facilitate making electrical connections to the projector.

Arrangement of Check-out Area

The following steps provide a simple procedure for setting up the permanent test facilities. It is particularly important that the projector be perfectly square with the viewing screen in order to eliminate the possibility of vertical or horizontal keystoning. Even the slightest keystoning will result in unequal focusing of the projected image at the four corners, and will especially affect resolution readings. Therefore, several of the following steps involve squaring the projected light with the screen. Permanently locating the test stand and viewing screen will assure that the proper relationship, once established, does not change.

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