Microtek ScanMaker 3700 Manual

Lamp Replacement Instructions

ScanMaker 3700

A scanner is a precision optical instrument and changing a lamp is not like changing a

household bulb. We do not recommend that you replace the scanner lamp on your own

because of potential problems that may come up during the lamp replacement. Technical

Support personnel are not trained in repair; therefore, if you get in trouble, assistance in

replacing the lamp is not available. Proceed at your own risk!

Tools Needed:

 Phillips Screw Driver

 Flat Screw Driver or small pry bar

 Needle Nose Pliers

Recommended Materials:

 Glass Cleaning Cloth

 Canned Air

Selecting A Work Area

It is important that you begin by planning where you will lay your disassembled parts.

 Locate an area with a workbench, table or desk with plenty of space.

 Make sure that the area is clear of any other parts from other devices, as the many

screws and nuts can be easily confused.

 We recommend that you lay a sheet or tablecloth on the surface you will be

working on. This will prevent tools, parts and screws from sliding around and

falling to the floor. This will also prevent any parts from scratching the surface of

the work area.

Before You Start

 In order to prevent any short-circuiting of the electronic chips on the scanners

motherboard, it is very important that you ground yourself by simply touching the

metal part or parts of your PC.

Make sure that the area you touch on your PC is bare metal and not coated with paint or

plastic. This will allow for any static electricity to discharge form your body.

Note: Make sure that the scanner power cable is disconnected from the back of

the scanner at this point.

Removing the Scanner Lid

Removing the scanner lid is probably the easiest part of these instructions. Simply open

the scanner lid to a 90-degree angle and lift upward to remove the lid. (See illustration

below.)

Removing the Scanner Upper Outer Housing

 Most of our scanner models have two phillips head screws holding down the

upper housing.

You will notice the phillips screws inside of the receptacles where the scanner lid posts

(hinges) are inserted. (See illustration below.)

1. Remove the Phillips head screws inside of the receptacles where the scanners lid posts

(hinges) were inserted.

Note: Do not use screwdrivers with magnetic or magnetized tips. Using

magnetized tools around the scanners circuit boards may damage the circuitry,

therefore rendering your scanner useless.

2. You will need to pry open the scanners upper housing. In order to do this without

damaging the scanner we will need a flat head screw driver or a very small pry bar.

Position the front of the scanner facing away from you on the workbench. (See

illustration below.)

Back of the

Scanner

3. Take your flat head screw driver or small pry bar and locate the area immediately

below the lid hinge receptacles. Take your flat head screwdriver and insert it between the

upper and lower housing. (See illustration below.)

Warning: Make sure to select an area where the scanner’s motherboard is not in

the way when you insert the screwdriver or pry bar. If you insert your prying tool

into the motherboard of the scanner you may damage the circuitry, rendering the

scanner useless.

4. Once the flat head screwdriver has been inserted between the upper and lower

housing, rotate the screwdriver or pry bar clockwise and counter clock wise in order to

pry open or separate the upper scanner housing from the lower scanner housing.

Note: A good indication that this has happened is that you will here a clicking or

snapping sound as the interior plastic clips are released by the force being used

to pry the scanners upper housing with the screwdriver or pry bar.

5. Once the scanner’s upper housing has been released lift the scanner’s upper housing (at

the rear of the scanner) upward about 1 to 2 inches. (See illustration below.)

This will allow the scanner’s upper housing to clear the two plastic posts at the rear of the

scanner. Then simply pull the upper housing forward or towards you about an inch. Then

lift the upper housing upward to remove. See illustration below:

Removing The Scanner Lamp Assembly

1. Drag the scanner carriage to the center of the scanner as it offers more room to work

and maneuver. (See illustration below.)

Plastic Post

Scanner Carriage

2. Remove the carriage shaft bar guide. You can easily achieve this by locating the clip

post towards the front of the scanner. Pull the metal shaft upward until it dislodges from

the clip post. Then simply remove the metal shaft by sliding the shaft out of the shaft

guides. (See illustration below.)

Note: Be careful not to pull to hard or do not lift the carriage to high, as this may

break some of the ribbon cable connections. (See illustration below.)

Front of Scanner

Pull Shaft Guide

Upward

Lift Shaft about 1 inch and pull outward

3. Locate the connector that connects the florescent lamp to the scanner’s carriage

mechanism. You will need to remove the connector. If it is too tight or difficult to

remove manually use the needle nose pliers to remove the connector. (See illustration

below.)

Scanner Lamp

connector

wires

(side view)

Scanner Lamp

connector

wires leading

to lamp

connector on

circuit board.

Scanner Lamp

Assembly connector.

(Underneath the scanner

lamp assembly)

Note: If the Scanner lamp Assembly Connector is too difficult to remove manually

use a set of needle nose pliers to remove it. (See illustration below.)

4. Once the florescent lamp connector has been disconnected you need to remove the

lamp assembly. Flip the scanner carriage lamp over to locate the Philip screws that hold

lamp assembly in place. Remove the two Philip head screws. (See illustration below.)

eedle Nose

liers pulling

the Scanner

Lamp

assembly

connector off

the circuit

oard.

Scanner Lamp Assembly is

held by two phillip screws.

5. Use a small flat screwdriver and dislodge the lamp assembly from the scanner

carriage. (See illustration below.)

6. Once scanner lamp assembly is disassembled from the scanner carriage, simply lift

the lamp assembly upward to remove. (See illustration below.)

Warning: Do not touch the mirrors or any other parts inside of the scanner

carriage assembly after you remove the scanner lamp assembly. If any dust

particles land on the mirrors or touching the mirrors may affect the quality of the

scanned output.

Connecting the new Lamp Assembly

1. Check new lamp or lamp assembly and make sure that the lamp & assembly are not

physically damaged.

2. Align the new lamp assembly directly over the open area of your scanner carriage.

Once the lamp assembly has lined up just right firmly press downward in order to

successfully clip the lamp assembly to the scanner’s carriage.

3. Replace the two small phillips screws that hold the lamp assembly secure to the

scanner carriage and connect the lamp assembly connector to the carriage assembly

circuit board. (See illustration below.)

Note: Check to make sure there are no loose wires, disconnected connectors and

also make sure that the scanner’s running motor belt is connected and did not

come loose. Also take your canned air at this point and blow out any dust or

particles within the scanners lower housing.

4. Make sure that the scanner lamp assembly wire is inserted through the proper

groove. If you connect the wire outside the scanner lamp assembly groove it will

jam the scanner carriage during scans. (See illustration below.)

otice how the

scanner lamp

assembly wire is

inserted through

the groove.

otice the roller

on the carriage

guide. This

roller helps the

scanner carriage

glide across the

scanner bed. No

wiring should be

connected higher

than this roller.

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