Microtek GNC I 3700LAMPREPLACEMENT User 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 th e 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 sc anners 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 clo ckwise 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:

Plastic Post

Removing The Scanner Lamp Assembly

1. Drag the scanner carriage to the c enter of the scanner as it off ers more room to work and maneuver. (See illustration below.)

Scanner Carriage

2. Remove the carriage shaft bar guide. You ca n easily achieve this b y 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.)

Front of Scanner

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

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

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 Assembly connector. (Underneath the scanner lamp assembly)

Scanner Lamp connector wires leading to lamp connector on circuit board.

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.)

eedle Nose

liers pulling the Scanner Lamp assembly connector off the circuit

oard.

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.)

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 conn ectors 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 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.

otice how the scanner lamp assembly wire is inserted through the groove.

5. Replace the carriage shaft bar guide. You can easil y achieve this by locati ng the clip post towards the front of the scanner. Push the metal shaft downward until it snaps into the clip post. (See illustration below.)

Insert Shaft through the shaft bar receptacles on the Scanner lamp assembly.

Push the metal shaft downward until it snaps into the clip post.

Assembling the Upper Housing

1. Before putting the upper housing assembly together, it may be a good time for you to clean the interior side of the scanne rs glass bed. Clear glass cleaners and a soft cotton cloth are the recommended materials to clean the scanners glass bed. Using a clear solution will prevent streaks from forming on your scanners glass bed.

2. Now take the upper housing and align with the bottom part of the scanner housin g. Then lift the rear of the scanner’s upper housin g about one inch and slide forward until the front of the upper housing drops about half an inch. Then, pull the upper housing backward until it comes flush with the scanner’s lower housing. Once the upper and

lower housing are aligned press firmly downward to allow the plastic clips to fasten and connect the upper and lower scanner housing. (See illustration below.)

3. To fasten the scanner’s upper and lower housing repla ce the two Phillips screws that were removed from the lids receptacles at the back of the scanner. Then position the scanner lid to a 90 angle over the lid receptacles at the rear of the scanner and insert t he lid back in place. (See illustration below.)

Note: Prior to reconnecting the scanner to you computer, make sure to inspect the interior of the scanner through the scanne rs glass bed and check for an y loose or pinched wires.