3M 2100 Manuel utilisateur

Model 2100 (4100)

Overhead Projector

78-6970-1335-3 9/92

3M Austin CenterBuilding

A145-5N-01

Austin, TX 78726-9000

Visual Systems Division

Service Manual

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

9/92

MODEL 2100 OVERHEAD PROJECTOR

TITLE PAGE NUMBER

TABLE OF CONTENTS

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

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-out Facilities......................................................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)

9/92

MODEL 2100 OVERHEAD PROJECTOR

This service manual contains servicing instruction, troubleshooting guide,

adjustments, electrical diagrams, assembly/dis-assembly of 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

1-1

SECTION 1 INTRODUCTION

9/92

MODEL 2100 OVERHEAD PROJECTOR

1-2

9/92

MODEL 2100 OVERHEAD PROJECTOR

2130/2140/2150

4130/4140/41 50 2160/2170/2180 2160/2170/2180

100VAC

50/60HZ

3.6 Amps

14-1/2' (4.4mm)

-------

F4 Amp - 250 Volt

220/230/240VAC

50HZ

1.7 Amps

14-1 /2' (4.4mm)

VDE, NEMKO,

SETI

SEMKO, SEV

F4 Amp - 250 Volt

120/127/VAC

60HZ

3.0 Amps

14-1/2' (4.4mm)

UL, CSA

-------

Voltage

Frequency

Current Rating

Power Cord

Agency Approval

Fuse

Electrical

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

1-2

9/92

1-3

MODEL 2100 OVERHEAD PROJECTOR

PRINCIPLES OF OPERATION

Optics (See Figure 1-2)

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 Figure 1-3)

Cooling of the overhead projector is

accomplished by a motor-driven fan located

next to the lamp housing. The cooling air

enters the projector through opening “A”

and exits through opening “B.” (See Figure

1-3) 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.

9/92 2-1

MODEL 2100 OVERHEAD PROJECTOR

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

SECTION 2 - OPERATION AND MAINTENANCE

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

MUST BE IN THE VERTICAL

POSITION.

9/92

MODEL 2100 OVERHEAD PROJECTOR

2-2

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 FO-

CUS 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.

- Toremoveyellowcorners,rotatethe

dial clockwise.

7. Correct any vertical keystoning by

tilting the screen until it is perpen-

dicular to the light beam axis.

Correct any horizontal keystoning by

moving the projector until it is perpen-

dicular with the screen.

9/92

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-out lamp and

prevent burned fingers. Unplug the

unit before replacing the lamp.

2-3

9/92

MODEL 2100 OVERHEAD PROJECTOR

2-4

CLEANING

The optical components of the overhead pro-

jector 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.

Asmallamountofmilddetergentinwaterwill

serveasasubstitute.Usesoft,lint-freecloths,

one to apply the solution and another for

drying.

NOTE

Never use paper lens tissues on

projection lenses as they may dam-

age 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 pull-

ing either one of two hinges outward until

the hinge pin is out of the hole. Slide the

completeTopCoverAssemblyintheoppo-

site direction to release the second hinge

and lift up and out (See Figure).

3.LoosenthefourscrewsholdingtheFresnel

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

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 sur-

face 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.

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