3M 2100 User Manual

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Model 2100 (4100)

Overhead Projector

Service Manual

(Order the M2100 Illustrated Parts Breakdown separately - Stock # 78-6970-4936-5)

78-6970-1335-3

9/92

Visual Systems Division

3M Austin CenterBuilding

A145-5N-01

Austin, TX 78726-9000

MODEL 2100 OVERHEAD PROJECTOR

TABLE OF CONTENTS

Technical Support Hotline - 1-800-328-1371(U.S. & Canada)

TITLE

PAGE NUMBER

 

 

 

 

Section 1 - Introduction .................................................................................

1-1

 

Specifications ..............................................................................

1-1

 

Principles of Operation................................................................

1-3

 

- Optics .......................................................................................

1-3

 

- Cooling .....................................................................................

1-3

 

Section 2 - Operation and Maintenance ........................................................

2-1

 

Set Up Procedure .......................................................................

2-1

 

Lamp Management System ........................................................

2-3

 

Cleaning ......................................................................................

2-4

 

- Cleaning Stage and Fresnel Lens .............................................

2-4

 

- Mirrors ......................................................................................

2-4

 

Lubrication ..................................................................................

2-5

 

Section 3 - Troubleshooting ...........................................................................

3-1

 

Section 4 - Adjustments ................................................................................

4-1

 

General .......................................................................................

4-1

 

Tools Required ............................................................................

4-1

 

Projector Check-outFacilities......................................................

4-1

 

Optical Alignment........................................................................

4-3

 

- Square Image ...........................................................................

4-3

 

- Focus Mechanism .....................................................................

4-4

 

- Aligning the Fresnel Lens .........................................................

4-4

 

Color Tuning Cable......................................................................

4-5

 

Post (Folding) ..............................................................................

4-6

 

Lampchanger Cable ....................................................................

4-6

 

Section 5 - Electrical Diagrams .....................................................................

5-1

 

Section 6 - Disassembly/Re-assembly ..........................................................

6-1

 

Projection Head Assembly (Doublet) ..........................................

6-1

 

Projection Head Assembly (Triplet) .............................................

6-1

 

Top Cover Assembly ...................................................................

6-1

 

Fresnel Lens ...............................................................................

6-1

 

Stage Glass ................................................................................

6-2

 

Focusing Assembly .....................................................................

6-2

 

Condenser Lens .........................................................................

6-3

 

Section 7 - Illustrated Parts Breakdown.........................................................

7-1

 

(Published separately - Stock # 78-6970-4936-5)

 

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MODEL 2100 OVERHEAD PROJECTOR

SECTION 1 INTRODUCTION

This service manual contains servicing instruction, troubleshooting guide, adjustments, electrical diagrams, assembly/dis-assemblyof parts and the illustrated parts list.

 

 

ANGULAR BODY

 

 

 

(2130/4130, 2140/4140, 2160, 2170)

 

 

 

 

 

ROUND BODY

 

 

 

 

 

(2150/4150, 2180)

 

SPECIFICATIONS

 

 

 

Physical

 

 

 

 

Width

-

15.25"

(387mm)

 

 

Depth

-

20.25"

(514mm)

(Post in upright position)

 

 

-

26.25"

(667mm)

(Post in folded position)

 

Height -

7.75"

(197mm)

(Body)

 

 

-

30.75"

(781mm)

(Maximum, top of head)

 

Weight -

22 lbs.

(10.0 Kg)

2180

 

 

-

25 lbs.

(11.3 Kg)

2130, 2140, 2150, 2160, 2170, 4130, 4140, 4150

 

 

 

 

 

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1-1

MODEL 2100 OVERHEAD PROJECTOR

1-2

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MODEL 2100 OVERHEAD PROJECTOR

Electrical

2130/2140/2150

2160/2170/2180

2160/2170/2180

 

4130/4140/41 50

 

 

Voltage

120/127/VAC

100VAC

220/230/240VAC

Frequency

60HZ

50/60HZ

50HZ

Current Rating

3.0 Amps

3.6 Amps

1.7 Amps

Power Cord

14-1/2'(4.4mm)

14-1/2'(4.4mm)

14-1 /2'(4.4mm)

Agency Approval

UL, CSA

-------

VDE, NEMKO,

 

 

 

SETI

Fuse

-------

F4 Amp - 250 Volt

SEMKO, SEV

 

F4 Amp - 250 Volt

 

 

 

Mechanical

Safety interlock: Shuts off power to the projector when the top cover assembly is opened.

Safety thermostat: Cuts power to the lamp if the projector exceeds safe operating temperature.

Color tuning knob: Allows projector to be easily color tuned for any screen size 1.0m x 1.0m (40" x 40") to 2.8m x 2.8m (110" x 110").

Projection Head Tilt - 0° - 20° (All Heads)

Lamp Changer - when lamp burns out, switch to standby lamp.

Optical

Lamp: ANSI Code FNT, 24 Volt, 275 Watt

Lamp Life: 75 Hours

 

 

 

 

2130/2140/2150

2160/2170/2180

 

4130/41 40/4150

 

Illumination:

 

2000 lumens typical;

2100 lumens typical;

1800 lumens minimum; 1900 lumens minimum;

Mirrors: Chassis mirror is second surface high reflective type. (After serial no. 435242) Projection mirror is front surface high reflective type.

 

2130, 2140, 2160, 2170

2150, 2180

 

 

4130/4140

4150

Head, Projection:

 

355mm (14.0" F.L.)

327mm (12.9" F.L.)

 

 

Doublet

Triplet - w/focus

 

 

293mm (11.5" F.L.)

correction

 

 

Singlet

330mm (13" F.L.)

 

 

 

 

After serial no. 411964

 

2130/21 40/2150

2160/2170/2180

 

4130/41 40/4150

 

Stage:

 

267mm x 267mm

285mm x 285mm

Transmissive

 

(10.5" x 10.5")

(11.2" x 11.2")

Aperture

 

 

 

 

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1-2

MODEL 2100 OVERHEAD PROJECTOR

PRINCIPLES OF OPERATION

Optics (See Figure1-2)

The light source for the Overhead Projector is 275 watt, 24 volt, Tungsten Lamp listed as ANSI Code FNT and rated at 75 hours. An external reflector is needed with this lamp.

Care should be exercised to prevent excessive vibration or jarring of the projector when the lamp is on. The lamp filament becomes more brittle at the operating temperature of the projector and shocks may cause premature failure of the lamp.

The glass envelope should not be touched by the fingers when inserting the lamp in the lampholder. Oils on the skin may combine with the glass to form blisters which also will shorten the life of the lamp.

The Fresnel lens, located above the lamp and directly beneath the projection stage, is a condensing lens which consists of a series of concentric rings, each of which has a surface curvature similar to that of a thick smooth lens. The Fresnel lens is made of plastic and may be severely damaged if the fan is stopped or the paths of cooling air blocked. Proper alignment and direction of the Fresnel lens is essential in order to maintain the resolution and brightness specifications for the projector.

The stage glass provides a convenient flat surface for placing transparencies and other materials to be projected. Because the light passes through the stage, these projection materials must be transparent.

There are two (2) different projection head assemblies available for the projector. One is an Open Triplet Head with focus correction which has a triplet lens and front surface mirror and the second a closed Doublet Head which has one or two condensing lens(es) and a front surface mirror. The projection head is located directly over the center of the Fresnel Lens. The projector is focused by raising or lowering the projection head.

Proper alignment of the optical components and a clean machine are essential if the maximum operating capabilities of the overhead projector are to be realized. Cleaning and alignment procedures are discussed in Sections 2 and 4 inclusive.

Cooling (See Figure1-3)

Cooling of the overhead projector is accomplished by a motor-drivenfan located next to the lamp housing. The cooling air enters the projector through opening “A” and exits through opening “B.” (See Figure1-3)It’s important that the flow of cooling air not be restricted either by placing projector too close to a wall (about one foot clearance is necessary) or by leaving foreign objects inside the projector.

1-3

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MODEL 2100 OVERHEAD PROJECTOR

SECTION 2 - OPERATION AND MAINTENANCE

SET UP PROCEDURE

1 . Connect the power cord to a properly grounded electrical outlet. (Electrical requirements are listed on the serial plate located under the base of the projector.)

2.Place the projector on a level surface and turn the projector on by pushing down on the ON/OFF switch.

CAUTION!

Do not look in the front projection lens when lamp is on.

3. Adjust the image to the screen elevation by moving the front projection lens upward or downward on the DOUBLET HEAD

ASSEMBLY and the mirror on the TRIPLET HEAD ASSEMBLY. (See

Figure 2-2)

4.Place a transparency on the stage glass and focus the projected image by rotating the Focus Knob. (See Figure 2-3)

5.To maintain top to bottom focus when the screen is not perpendicular to the projected image, engage the FOCUS CORRECTION LEVER located on the under side of the TRIPLET HEAD ASSEMBLY using the following procedure:

NOTE

 

THE PROJECTION SCREEN

 

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MUST BE IN THE VERTICAL

2-1

POSITION.

 

 

MODEL 2100 OVERHEAD PROJECTOR

A.Pull the mirror down as the FOCUS CORRECTION LEVER is pushed to the rear of the head assembly.

B.Raise the mirror back to the original position and refocus using the FOCUS KNOB.

6.Rotate the Color Tuning Knob until the projected image is free of any

yellow or blue corners.

-To remove blue corners, rotate the dial counterclockwise.

-To remove yellow corners, rotate the dial clockwise.

7.Correct any vertical keystoning by tilting the screen until it is perpendicular to the light beam axis.

Correct any horizontal keystoning by moving the projector until it is perpendicular with the screen.

2-2

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MODEL 2100 OVERHEAD PROJECTOR

LAMP MANAGEMENT SYSTEM

(Lamp Indicator)

Pertains only to models equipped with lamp indicators. (2130/4130 - No holes, opaque)

NOTE

When the projector is turned on, the red X will momentarily light. This is a characteristic of the projector.

The Lamp Indicator indicates status of projection lamp as defined on the following labels:

METHOD 1

A red X will appear on the lamp symbol when that lamp is burned out. Switch to the standby lamp. The X will continue to light until the defective lamp is changed.

METHOD 2

A red X will appear between the two lamp symbols when a lamp is burned out. Switch to the standby lamp. The X will continue to light until the defective lamp is changed.

NOTE

The Overhead Projector must remain on for 2 to 3 minutes after a lamp burns out. This will allow the fan to cool the burned-outlamp and prevent burned fingers. Unplug the unit before replacing the lamp.

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2-3

MODEL 2100 OVERHEAD PROJECTOR

CLEANING

The optical components of the overhead projector require occasional cleaning to remove the dust and oil which tends to accumulate and absorb light. 3M Brand Lens Cleaner (Part No. 78-6969-7086-6)is recommended.

A small amount of mild detergent in water will serve as a substitute. Use soft, lint-freecloths, one to apply the solution and another for drying.

NOTE

Never use paper lens tissues on projection lenses as they may damage the lens.

Cleaning Stage Glass and Fresnel Lens

When cleaning the underside of the stage glass and the top side of the Fresnel Lens, observe the following steps.

1.Pull the Release Latch and lift the top cover Top Cover Assembly (See Figure).

2.Remove the Top Cover Assembly by pulling either one of two hinges outward until

the hinge pin is out of the hole. Slide the complete Top Cover Assembly in the opposite direction to release the second hinge and lift up and out (See Figure).

3.Loosen the four screws holding the Fresnel Lens in place. NOTE: Do not remove the screws.

4.Turn the retaining clips off to one side.

5.Remove the Fresnel Lens.

6.All surfaces can now be cleaned.

7.Replace all components in reverse order.

Mirrors

The mirror in the Open Lens Projection

Head of all Model 2100 (4100) projectors are front surface mirrors and must NOT be cleaned with a cloth and lens cleaner.

Remove any surface dirt on this mirror with a Camel Hair Brush only.

Prior to serial number 435242 a front surface type Chassis Mirror was used (clean as above). After serial number 435242, a second surface high reflective type is used and may be cleaned with a soft cloth and lens cleaner.

2-4

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