Microtek ScanMaker 3700 Manual

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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.

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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.

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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

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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.)

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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

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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

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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)

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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.)
N
eedle Nose
p
liers pulling
the Scanner
Lamp
assembly
connector off
the circuit
b
oard.
Scanner Lamp Assembly is
held by two phillip screws.

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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.

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