LG RD-JT91 User manual

DLP PROJECTOR
SERVICE MANUAL
CAUTION
BEFORE SERVICING THE CHASSIS,
READ THE SAFETY PRECAUTIONS IN THIS MANUAL.
CHASSIS : RE-048A
MODEL : RD-JT91
website:http://biz.LGservice.com
e-mail:http://www.LGEservice.com/techsup.html

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CONTENTS
CONTENTS.......................................................................................................................2
SAFETY PRECAUTIONS .................................................................................................3
SERVICING PRECAUTIONS............................................................................................4
CONTROL DESCRIPTIONS.............................................................................................6
REPLACING OF LAMP ..................................................................................................10
SPECIFICATIONS...........................................................................................................11
ADJUSTMENT INSTRUCTION.......................................................................................13
PRINTED CIRCUIT BOARD...........................................................................................18
BLOCK DIAGRAM..........................................................................................................21
EXPLODED VIEW...........................................................................................................22
EXPLODED VIEW PARTS LIST.....................................................................................23
REPLACEMENT PARTS LIST........................................................................................24
SVC. SHEET .......................................................................................................................

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SAFETY PRECAUTIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These parts are identified by in
the Schematic Diagram and Replacement Parts List.
It is essential that these special safety parts should be replaced with the same components as recommended in this manual to
prevent X-RADIATION, Shock, Fire, or other Hazards.
Do not modify the original design without permission of manufacturer.
General Guidance
An isolation Transformer should always be used during
the servicing of a receiver whose chassis is not isolated from
the AC power line. Use a transformer of adequate power rating
as this protects the technician from accidents resulting in
personal injury from electrical shocks.
It will also protect the receiver and it's components from being
damaged by accidental shorts of the circuitry that may be
inadvertently introduced during the service operation.
If any fuse (or Fusible Resistor) in this TV receiver is blown,
replace it with the specified.
When replacing a high wattage resistor (Oxide Metal Film
Resistor, over 1W), keep the resistor 10mm away from PCB.
Keep wires away from high voltage or high temperature parts.
Due to high vacuum and large surface area of picture tube,
extreme care should be used in handling the Picture Tube.
Do not lift the Picture tube by it's Neck.
X-RAY Radiation
Warning:
To determine the presence of high voltage, use an accurate
high impedance HV meter.
Adjust brightness, color, contrast controls to minimum.
Measure the high voltage.
The meter reading should indicate
23.5 ¡1.5KV: 14-19 inch, 26 ¡1.5KV: 19-21 inch,
29.0 ¡1.5KV: 25-29 inch, 30.0 ¡1.5KV: 32 inch
If the meter indication is out of tolerance, immediate service
and correction is required to prevent the possibility of
premature component failure.
Before returning the receiver to the customer,
always perform an AC leakage current check on the exposed
metallic parts of the cabinet, such as antennas, terminals, etc.,
to be sure the set is safe to operate without damage of
electrical shock.
Leakage Current Cold Check(Antenna Cold Check)
With the instrument AC plug removed from AC source,
connect an electrical jumper across the two AC plug prongs.
Place the AC switch in the on position, connect one lead of
ohm-meter to the AC plug prongs tied together and touch other
ohm-meter lead in turn to each exposed metallic parts such as
antenna terminals, phone jacks, etc.
If the exposed metallic part has a return path to the chassis, the
measured resistance should be between 1MΩ and 5.2MΩ.
When the exposed metal has no return path to the chassis the
reading must be infinite.
An other abnormality exists that must be corrected before the
receiver is returned to the customer.
Leakage Current Hot Check (See below Figure)
Plug the AC cord directly into the AC outlet.
Do not use a line Isolation Transformer during this check.
Connect 1.5K/10watt resistor in parallel with a 0.15uF capacitor
between a known good earth ground (Water Pipe, Conduit, etc.)
and the exposed metallic parts.
Measure the AC voltage across the resistor using AC
voltmeter with 1000 ohms/volt or more sensitivity.
Reverse plug the AC cord into the AC outlet and repeat AC
voltage measurements for each exposed metallic part. Any
voltage measured must not exceed 0.75 volt RMS which is
corresponds to 0.5mA.
In case any measurement is out of the limits specified, there is
possibility of shock hazard and the set must be checked and
repaired before it is returned to the customer.
Leakage Current Hot Check circuit
The source of X-RAY RADIATION in this TV receiver is the
High Voltage Section and the Picture Tube.
For continued X-RAY RADIATION protection, the
replacement tube must be the same type tube as specified in
the Replacement Parts List.
1.5 Kohm/10W
To Instrument's
exposed
METALLIC PARTS
Good Earth Ground
such as WATER PIPE,
CONDUIT etc.
AC Volt-meter
IMPORTANT SAFETY NOTICE
0.15uF

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CAUTION: Before servicing receivers covered by this service
manual and its supplements and addenda, read and follow the
SAFETY PRECAUTIONS on page 3 of this publication.
NOTE: If unforeseen circumstances create conflict between the
following servicing precautions and any of the safety
precautions on page 3 of this publication, always follow the
safety precautions. Remember: Safety First.
General Servicing Precautions
1. Always unplug the receiver AC power cord from the AC
power source before;
a. Removing or reinstalling any component, circuit board
module or any other receiver assembly.
b. Disconnecting or reconnecting any receiver electrical plug
or other electrical connection.
c.
Connecting a test substitute in parallel with an electrolytic
capacitor in the receiver.
CAUTION: A wrong part substitution or incorrect
polarity installation of electrolytic capacitors may result
in an explosion hazard.
d. Discharging the picture tube anode.
2. Test high voltage only by measuring it with an appropriate
high voltage meter or other voltage measuring device (DVM,
FETVOM, etc) equipped with a suitable high voltage probe.
Do not test high voltage by "drawing an arc".
3. Discharge the picture tube anode only by (a) first connecting
one end of an insulated clip lead to the degaussing or kine
aquadag grounding system shield at the point where the
picture tube socket ground lead is connected, and then (b)
touch the other end of the insulated clip lead to the picture
tube anode button, using an insulating handle to avoid
personal contact with high voltage.
4. Do not spray chemicals on or near this receiver or any of its
assemblies.
5. Unless specified otherwise in this service manual, clean
electrical contacts only by applying the following mixture to
the contacts with a pipe cleaner, cotton-tipped stick or
comparable non-abrasive applicator; 10% (by volume)
Acetone and 90% (by volume) isopropyl alcohol (90%-99%
strength)
CAUTION: This is a flammable mixture.
Unless specified otherwise in this service manual, lubrication
of contacts in not required.
6. Do not defeat any plug/socket B+ voltage interlocks with
which receivers covered by this service manual might be
equipped.
7. Do not apply AC power to this instrument and/or any of its
electrical assemblies unless all solid-state device heat sinks
are correctly installed.
8. Always connect the test receiver ground lead to the
receiver chassis ground before connecting the test receiver
positive lead.
Always remove the test receiver ground lead last.
9.
Use with this receiver only the test fixtures specified in this
service manual.
CAUTION: Do not connect the test fixture ground strap to
any heatsink in this receiver.
Electrostatically Sensitive (ES) Devices
Some semiconductor (solid state) devices can be damaged
easily by static electricity. Such components commonly are
called
Electrostatically Sensitive (ES) Devices. Examples of
typical ES devices are integrated circuits and some field-effect
transistors and semiconductor "chip" components. The
following techniques should be used to help reduce the
incidence of component damage caused by static by static
electricity.
1. Immediately before handling any semiconductor component
or semiconductor-equipped assembly, drain off any
electrostatic charge on your body by touching a known earth
ground. Alternatively, obtain and wear a commercially
available discharging wrist strap device, which should be
removed to prevent potential shock reasons prior to
applying power to the unit under test.
2. After removing an electrical assembly equipped with ES
devices, place the assembly on a conductive surface such as
aluminum foil, to prevent electrostatic charge buildup or
exposure of the assembly.
3. Use only a grounded-tip soldering iron to solder or unsolder
ES devices.
4. Use only an anti-static type solder removal device. Some
solder removal devices not classified as "anti-static" can
generate electrical charges sufficient to damage ES devices.
5. Do not use freon-propelled chemicals. These can generate
electrical charges sufficient to damage ES devices.
6. Do not remove a replacement ES device from its protective
package until immediately before you are ready to install it.
(Most replacement ES devices are packaged with leads
electrically shorted together by conductive foam, aluminum
foil or comparable conductive material).
7. Immediately before removing the protective material from
the ieads of a replacement ES device, touch the protective
material to the chassis or circuit assembly into which the
device will be installed.
CAUTION:Be sure no power is applied to the chassis or
circuit, and observe all other safety precautions.
8. Minimize bodily motions when handling unpackaged
replacement ES devices. (Otherwise harmless motion such
as the brushing together of your clothes fabric or the lifting
of your foot from a carpeted floor can generate static
electricity sufficient to damage an ES device.)
General Soldering Guidelines
1. Use a grounded-tip, low-wattage soldering iron and
appropriate tip size and shape that will maintain tip
temperature within the range or 500¡£F to 600¡£F.
2. Use an appropriate gauge of RMA resin-core solder
composed of 60 parts tin/40 parts lead.
3. Keep the soldering iron tip clean and well tinned.
4. Throughly clean the surfaces to be soldered. Use a mall
wirebristle (0.5 inch, or 1.25cm) brush with a metal handle.
Do not use freon-propelled spray-on cleaners.
5. Use the following unsoldering technique
a. Allow the soldering iron tip to reach normal temperature.
(500¡£F to 600¡£F)
b. Heat the component lead until the solder melts.
c. Quickly draw the melted solder with an anti-static,
suction-type solder removal device or with solder braid.
CAUTION: Work quickly to avoid overheating the circuit-
board printed foil.
6. Use the following soldering technique.
a. Allow the soldering iron tip to reach a normal
temperature (500¡£F to 600¡£F)
b. First, hold the soldering iron tip and solder the strand
against the component lead until the solder melts.
SERVICING PRECAUTIONS

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c. Quickly move the soldering iron tip to the junction of the
component lead and the printed circuit foil, and hold it
there only until the solder flows onto and around both the
component lead and the foil.
CAUTION: Work quickly to avoid overheating the circuit
board printed foil.
d. Closely inspect the solder area and remove any excess
or splashed solder with a small wire-bristle brush.
IC Remove/Replacement
Some chassis circuit boards have slotted holes (oblong) through
which the IC leads are inserted and then bent flat against the
circuit foil. When holes are the slotted type, the following
technique should be used to remove and replace the IC. When
working with boards using the familiar round hole, use the
standard technique as outlined in paragraphs 5 and 6 above.
Removal
1. Desolder and straighten each IC lead in one operation by
gently prying up on the lead with the soldering iron tip as the
solder melts.
2. Draw away the melted solder with an anti-static suction-
type solder removal device (or with solder braid) before
removing the IC.
Replacement
1. Carefully insert the replacement IC in the circuit board.
2. Carefully bend each IC lead against the circuit foil pad and
solder it.
3. Clean the soldered areas with a small wire-bristle brush.
(It is not necessary to reapply acrylic coating to the areas).
"Small-Signal" Discrete Transistor
Removal/Replacement
1. Remove the defective transistor by clipping its leads as
close as possible to the component body.
2. Bend into a "U" shape the end of each of three leads
remaining on the circuit board.
3. Bend into a "U" shape the replacement transistor leads.
4. Connect the replacement transistor leads to the
corresponding leads extending from the circuit board and
crimp the "U" with long nose pliers to insure metal to metal
contact then solder each connection.
Power Output, Transistor Device
Removal/Replacement
1. Heat and remove all solder from around the transistor leads.
2. Remove the heatsink mounting screw (if so equipped).
3. Carefully remove the transistor from the heat sink of the
circuit board.
4. Insert new transistor in the circuit board.
5. Solder each transistor lead, and clip off excess lead.
6. Replace heatsink.
Diode Removal/Replacement
1. Remove defective diode by clipping its leads as close as
possible to diode body.
2. Bend the two remaining leads perpendicular y to the circuit
board.
3. Observing diode polarity, wrap each lead of the new diode
around the corresponding lead on the circuit board.
4. Securely crimp each connection and solder it.
5. Inspect (on the circuit board copper side) the solder joints of
the two "original" leads. If they are not shiny, reheat them
and if necessary, apply additional solder.
Fuse and Conventional Resistor
Removal/Replacement
1. Clip each fuse or resistor lead at top of the circuit board
hollow stake.
2. Securely crimp the leads of replacement component around
notch at stake top.
3. Solder the connections.
CAUTION: Maintain original spacing between the replaced
component and adjacent components and the circuit board
to prevent excessive component temperatures.
Circuit Board Foil Repair
Excessive heat applied to the copper foil of any printed circuit
board will weaken the adhesive that bonds the foil to the circuit
board causing the foil to separate from or "lift-off" the board.
The following guidelines and procedures should be followed
whenever this condition is encountered.
At IC Connections
To repair a defective copper pattern at IC connections use the
following procedure to install a jumper wire on the copper
pattern side of the circuit board. (Use this technique only on IC
connections).
1. Carefully remove the damaged copper pattern with a sharp
knife. (Remove only as much copper as absolutely
necessary).
2. carefully scratch away the solder resist and acrylic coating
(if used) from the end of the remaining copper pattern.
3. Bend a small "U" in one end of a small gauge jumper wire and
carefully crimp it around the IC pin. Solder the IC connection.
4. Route the jumper wire along the path of the out-away
copper pattern and let it overlap the previously scraped end
of the good copper pattern. Solder the overlapped area and
clip off any excess jumper wire.
At Other Connections
Use the following technique to repair the defective copper
pattern at connections other than IC Pins. This technique
involves the installation of a jumper wire on the component
side of the circuit board.
1. Remove the defective copper pattern with a sharp knife.
Remove at least 1/4 inch of copper, to ensure that a
hazardous condition will not exist if the jumper wire opens.
2. Trace along the copper pattern from both sides of the
pattern break and locate the nearest component that is
directly connected to the affected copper pattern.
3. Connect insulated 20-gauge jumper wire from the lead of
the nearest component on one side of the pattern break to
the lead of the nearest component on the other side.
Carefully crimp and solder the connections.
CAUTION: Be sure the insulated jumper wire is dressed so
the it does not touch components or sharp edges.

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CONTROL DESCRIPTIONS
Names of parts
Main Body
Connecting Part
AUTO
SOURCE
POWER
VOL
VOL
MENU
OK
Indicators
Front remote control sensor
Power button
Foot adjusting button
Foot adjusting button
Rear remote control sensor
Control panel
* The projector is manufactured using high-precision technology. You may, however, see on the Projector
screen tiny black points and/or bright points (red, blue, or green). This can be a normal result of the
manufacturing process and does not always indicate a malfunction.
Focus ring
Zoom ring
Lens cover
* Push the lens cover into the inside after pulling it open into the
front. (If you mount on the ceiling, after pushing the cover, the lens
cover is installed. If not, the cover may overlap projecting lens.)
DVI Input S-Video USB(Service)
*This jack is only used for service.
Audio RGB Input
(PC/DTV) Video
AC IN
Kensington Security
System Connector

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Control Panel
AUTO
SOURCE
POWER
VOLVOL
MENU KEYSTONE
KEYSTONE OK
POWER Button
/, KEYSTONE+/- Button
MENU Button
Selects or closes menus.
AUTO Button
VOLUME Button
Adjusts volume level and
functions of menus.
SOURCE Button
Switches to RGB, DVI, Video,S-Video mode.
A OK Button
Checks present mode and
saves the change of functions.

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Remote Control
POWER
MENU SOURCE
AUTO
BLANK ARC
MUTE STILL
OK
VOL VOL
KEYSTONE
KEYSTONE
POWER Button
SOURCE Button
KEYSTONE+/-, D / EButton
AOK Button
ARC Button
STILL Button
AUTO Button
BLANK Button
MUTE Button
*Switches the sound on or off.
VOL-/+, F / GButton
MENU Button

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*Lamp Indicator, operation indicator and temperature indicator at the top of the projector show the user the operating
status of the projector.
AUTO
SOURCE
POWER
VOL
VOL
MENU
OK
Lamp Indicator
Temperature Indicator
Operation Indicator
Projector Status Indicators
Operation Indicator
Lamp Indicator
Temperature Indicator
Orange
Green(flashing)
Green
Orange(flashing)
Off
Red
Red(flashing)
Green(flashing)
Orange
Red
Red (flashing)
Standby.
The fan is running while the lamp preheats.
The lamp is preheated and on.
Projector lamp is cooling as power out (2 minutes)
Power off.
Projector lamp is reaching the end of its life and needs
to be replaced with a new lamp. (over 2000 hours)
The projector has trouble in the lamp or around it at
power-on. Retry Power On again later. If lamp indicator
is red (flashing) again, contact the service center.
The lamp cover is not closed.
The projector is in a high temperature condition. Turn off
the power to the unit and check for proper ventilation.
The projector is turned off due to the unit overheating.
Power has turned off due to problem with the
internal cooling fan. The fan is not operating.

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REPLACING OF LAMP
The projector lamp should lasts for about 2000 hours.You can
see the lamp hours time in the selecting function section.You
must replace the lamp when one or more of the following
apply.
O The projected image gets darker or starts to become
distorted.
O The lamp indicator is red.(Red,flashing alternately)
O The message “ LAMP REPLACE” appears on the screen
when turning the projector lamp on.
1. Turn off the projector and unplug the power cable.
(allow the lamp to cool for more than 1 hour.)
2. Stand the projector on its side as below so that you can
easily access the lamp cover.
3. Remove the two retaining screws on the lamp cover with a
screwdriver and then lift off the lamp cover.
4. After lifting the lamp cover off, remove the two retaining
screws on the lamp case with a screwdriver.
5. Lift up the fixed wire handle of the lamp.
6. Pull out the handle slowly and remove the lamp case.
7. Insert the new lamp gently into the correct position. Make
sure it is inserted correctly.
8. Tighten the screws you removed in step 4.
9. Replace the lamp cover and tighten the cover screws.
(Make sure the lamp cover is securely fastened.
If the lamp cover is open, the lamp indicator flashes green
and the projector will not turn on.)
Bottom of the Projector

SPECIFICATIONS
NOTE : Specifications and others are subject to change without notice for improvement .
AScope
This standard can be applied to the LCD Projector related to RE-048A Chassis.
ATest Condition
1) Temperature : 25°C¡5°C (Only CST is 40°C¡2°C )
2) Relative Humidity: 65¡10%
3) Power Voltage: Standard input voltage (AC 100 - 240V, 50/60Hz)
4) Use the parts only designated in B.O.M.,PARTS SPEC.,or drawings.
5) Follow each drawing or spec for spec and performance of parts,based upon P/N of B.O.M
6) Warm up TV set for more than 30min. before the measurement.
ATest and Inspection Method
1) performance:Follow the Standard of LG TV test
2) RCA JACK performance: Follow the standard of LG
3) Standards of Etc requirement
SAFETY:CE (EN55020), Electric wave:CB (EN55013)
AGeneral Specification
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No. Item
Video input applicable system
Power
Input Voltage
Market
Screen size
Aspect ratio
Operating Temperature
Operating Humidity
Storage Temperature
Storage Humidity
NTSC M
NTSC 4.43
PAL
PAL M
PAL N
SECAM
NTSC-PB
SMPS
AC 100(-10%) - 240(+6%)V,50/60Hz
World wide
4:3 / 16:9
4 : 3
0
-20
40
85
60
85
deg
%
deg
%
3.579545 / 60Hz
4.433618 / 60Hz
4.433618 / 50Hz
3.575611 / 60Hz
3.582056 / 50Hz
4.286 / 50Hz
4.433618 / 60Hz
1
2
3
4
5
6
7
8
9
10
Specification
Min Typ Max Unit Remark

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AFeature and function
No. Item
REMOCON
DVI Input
RGB Input
Component input
Composite input
S-video input
Audio input
USB Port
Local Key
Picture, Gamma
Picture, User Control
ACC
Display mode
Sound
OSD Language
NEC Code
1 Digital RGB
1 Separate
1 Y, PB, PR
480i, 480p, 720p, 1080i, 576i,576p
1 480i, 576i
1 480i,576i
1
1
Power, Menu, OK, Vol(+,-)
Source, keystone+/ keystone, auto
Normal/ Film/ Sports
Contrast/ Brightness/ Color/ Tint/ Sharpness
Normal/ Warm/ Cool
4:3 / 16:9
1W mono
Korean/ english/ Deutsch/ Italiano/ Espanol
/ Chinese/ Japanese/ france/ Swedish
DVI-D
D-Sub 15 pin
D-Sub 15 pin
RCA jack(Yellow)
S-VIDEO jack
PC-audio jack
USB jack (only for download)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Specification
Min Typ Max Unit Remark

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1. Application Object
This instruction is for the application to the DLP Projector
(CHASSIS : RE-048A).
2. Notes
(1) The power source insulation of this DLP Projector is not
charging type and you may not use the transformer for
insulation. It is advised to use an insulation transform
between the power supply cable and power input of the set
to protect the test equipment.
(2) The adjustment must be performed under the correct
sequence.
(3) The adjustment must be performed in the circumstance of
25!5cC of temperature and 65!10% of relative humidity.
(4) The input voltage of the receiver must keep AC 110V,
60Hz during adjustment.
(5) The set must be on for 5 minutes prior to any adjustment.
After receiving possible 100% white pattern, it is operated
preliminarily.
3. Accessing the Adjustment Mode
(1) Pressing the instart key on the service remote will open or
close the service menu.
(2) As shown <Fig. 1>, use the (CH+ (D),CH- (E)), select to
item press the ENTER or VOLUME key to enter the item
you wish to adjust.
(3) Press the Instart key to exit the service menu.
(4) Preparation for Adjustment
1) Power is connected in set to be power on.
2) Do heat run 5minutes.
4. Folding Mirror Adjustment
4-1. Before adjusting, check the position of
Folding MIrror
Check the position of Folding Mirror in the base of up /
down / left / right surface. (Fig. 4-1)
(1) Check the Lower Position
As shown <Fig. 4-1>, check the mirrors lower position in the
middle of the hole, located under the holder.
(2) Check the Left / Right Position
After checking the lower position, as shown <Fig. 4-2>, fix the
sides so they are vertically aligned with the base surface.
ADJUSTMENT INSTRUCTION
hole of the lower holder
<Fig.4-1> Check the Lower Position of Folding Mirror
base surface
<Fig.4-2> Check the Left / Right Position of Folding Mirror
1. Test Pattern G
2. Optic Check G
3. Temperature
4. RGB Gain/Off Set
5. Component Gain/Off Set
6. White Balance
7. CWI
8. Lamp Time Reset
9. White Peaking
10. PWM
<Fig.3> OSD of Adjustment Mode
Top and bottom
adjustment screw A
Left and right
adjustment screw C
Left and right
adjustment screw B
<Fig.4-3> Illuminator Adjustment Part by Folding Mirror

4-2. Illuminator Adjustment Sequence
Check the full white screen refer to (Fig 4-3) and make
adjustments in the following sequence.
(1) Up and Down Adjustment
1) Mark screw (A) in its original position. Turn screw (A) up /
down adjustment to the left and mark where the image is
aligned.
2) Mark screw (A) in its original position. Turn screw (A) up /
down adjustment to the right and mark where the image is
aligned.
3) Turn screw (A) up / down adjustment to the right / left and
mark where the image is aligned. Fix the adjustment screw
in position.
(2) Left and Right Adjustment 1
1) Mark screw (B) in its original position. Turn screw (B) Left /
Right adjustment to the right and mark where the image is
aligned.
2) Mark screw (B) in its original position. Turn screw (B) Left /
Right adjustment to the left and mark where the image is
aligned.
3) Turn screw (B) Left / Right adjustment to the right / left and
mark where the image is aligned. Fix the adjustment screw
in position.
(3) Left and Right Adjustment 2
1) Mark screw (C) in its original position. Turn screw (C) up /
down adjustment to the right and mark where the image is
aligned.
2) Mark screw (C) in its original position. Turn screw (C) up /
down adjustment to the left and mark where the image is
aligned.
3) Turn screw (C) up / down adjustment to the right / left and
mark where the image is aligned. Fix the adjustment screw
in position.
(4) Final Adjustment
Repeat turn screw (C) up / down adjustment to the right / left
and mark where the image is aligned. Fix the adjustment
screw in position. 1), 2), 3) adjustment twice and find the
optimum position. Check the image with the naked eye for
optimum alignment.
- 14 -
Step 1 Step 2 Step 3
<Fig.4-4> Illuminator up / down Adjustment Sequence
Step 1 Step 2 Step 3
<Fig.4-5> Illuminator Left/Right Adjustment Sequence 1
Step 1 Step 2 Step 3
<Fig.4-6> Illuminator Left/Right Adjustment Sequence 2

5. Caution for DMD
(Digital Micro-mirror Device)
5-1. Caution for DMD ESD
(1) Connector the grounding to prevent a damage of ESD
(Electrostatic Discharge) when handing the DMD.
(2) Wear a wrist strap to connect the ESD grounding in flesh
necessarily.
(3) Connect the ESD ground to workstation and an electric
conductor.
(4) Save the DMD after getting rid of a static electricity. Keep
it at an exclusive case when moving it When grounding,
open the case.
(5) Put on gloves for preventing static electricity.
(6) All work is done at static free location. Attach the tape or
remove a dust on the DMD front or DMD back pin
5-2. Caution for DMD Clean
(1) Follow the procedure and caution to prevent the screen
from being scratched.
(2) When DMD glass stains with dust, polish the front and
back DMD glass with soft cloth. Then, do it again after
rotating 180 degree the DMD. If necessary, keep under
observation.
(3) Don’t clean the DMD with the high pressure. The static
electricity and pressure will damage the DMD.
- 15 -
Up/down
screw A
Right
(tighten
direction)
Adjustmen
t part
Screen state
Initial state State after adjusting
Screw
direction Description
At first, upside illuminator goes down
and right illuminator also goes down in
detail.
Left
(loosen
direction)
At first, downside illuminator goes
down and left illuminator also goes
down.
left/right
screw B
Right
(tighten
direction)
At first, left illuminator goes down and
downside illuminator also goes down.
Left
(loosen
direction)
At first, right illuminator goes down and
upside illuminator also goes down.
left/right
screw C
Right
(tighten
direction)
At first, left illuminator goes down and
downside illuminator also goes down.
Left
(loosen
direction)
At first, right illuminator goes down and
upside illuminator also goes down.
4-3. Illuminator Phenomenon Adjustment
Illuminator goes down direction Illuminator goes down area

6. RGB Offset/Gain Adjustment
6-1. Required Test Equipment
(1) Pattern Generator 1EA (For analog RGB)
(2) Remote control 1EA
6-2. Setting of the device
Set the equipment as <Fig. 6-1>.
6-3. Preparation for Adjustment
(1) Connect the pattern generator as <Fig. 6-1>.
(2) Adjust pattern generator to SVGA 60Hz.
(3) Press the Input selection button to select the RGB input.
6-4. Sequence of Adjustment
(1) Select the white/back pattern for pattern generator as
<Fig. 6-2>. (SVGA 60Hz)
(2) Press the instart button on the service remote control to
select RGB offset/gain set in Adjustment menu.
(3) Automatic Adjustment : Press the enter button in RGB
offset/gain set of Adjustment menu. (Adjustment is
operated by system Micom automatically)
7. COMPONENT Offset/Gain Adjustment
(1) Select 75% color bar of <Fig. 7> for PC Pattern Generator
pattern. (Resolution 480p)
(2) Press the instart button on the remote control to select
component offset/gain set in the adjustment menu.
(3) Automatic Adjustment : Press the enter button in
component offset/gain set of Adjustment menu.
(Adjustment is operated by system Micom automatically)
[[. CWI/White Balance Measurement
Condition
(1) CWI and White Balance is adjusted using a CL-200 or
equivalent.
(2) Adjust the screen size to a minimum of 40 inches.
(3) Place the CL-200 on the center of projection screen.
(4) Make the measurement condition under 1Lux for CL-200
to measure the correct color coordinate.
8. CWI Adjustment
8-1. Setting of the Device
Set the equipment as <Fig. 8-1>.
8-2 Required Test Equipment
(1) Illuminometer (Model : CL-200) 1EA : Chromaticity
measurement from projection screen center.
(2) PC input equipment (Pattern Generator, PC)
(3) Set fixing device 1EA
(4) Remote control 1EA
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SCREEN Projector RGB PC Pattern
Generator
<Fig.6-1> Device setting diagram for RGB offset/gain adjustment
<Fig.6-2> Window Pattern
<Fig. 7>
Equipment to monitor Lx,X,Y data
Illuminometer
Set
Set fixing device
PC input
(Computer of Pattern)
SCREEN
<Fig.8-1> Device setting diagram for CWI adjustment

8-3. Preparation for Adjustment
(1) Connect the power cord and turn the set on, then connect
it to a PC input.
(2) Enter the CWI menu by using the Instart key on the
service remote. (Default value : 268)
(3) When entering CWI, a full red screen will display. At this
time, see the Illuminometer color coordinates on the
center.
8-4. Sequence of Adjustment
(1) Adjust CWI to the left/right value by using the volume
buttons at the first adjustment value is preset to 268.
(2) Illuminometer color coordinates change when pressing
volume button.
(3) X coordinates usually get maximum value at
X=0.630!0.02 and Y coordinates usually get minimum
value at Y=0.350!0.02. Adjust this value by pressing
volume button on the remote control. Adjustment range is
usually 258~278 and average value is 268.
(4) Check the red pattern whether it is entirely uniform. If it is
uniform then this setting is OK.
9. White Balance Adjustment
9-1. Required Test Equipment
(1) Illuminometer (Model : CL-200) 1EA : Chromaticity
measurement from projection screen center
(2) Pattern Generator (DVI input)
(3) Set fixing device 1EA
(4) Remote control 1EA
9-2. Equipment Composition
(1) Compose the equipment as <Fig. 9>.
(2) It may use a pattern other than 70% white. Use a white
pattern.
(3) Press the Instart key on the service remote to select white
peaking and check the RGB/DVI peaking data should be
set to 10.
(4) Press the Instart key on the service remote control to
select White balance.
(5) Change X, Y as below seeing X and Y coordinate of
illuminometer data.
1) Standard color coordinate when adjusting Warm
(6500!200 degree) mode
: X=0.313!0.002, Y=0.329!0.002
- Adjust the white X,Y
(default : white X -> 9995, white Y -> 10992)
2) Standard color coordinate when adjusting Cool
(9300!200 degree) mode
: X=0.283!0.002, Y=0.297!0.002)
- Adjust the white Y
(default : white X -> 9995, white Y -> 10992)
[It is unnecessary for normal mode adjustment.(The
remote control data does not become input)
(6) Press the Instart key on the service remote to select white
balance again and check the adjusted state of warm and
cool. Then, select normal and exit the service menu.
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Equipment to monitor Lx,X,Y data
Illuminometer
Set
Set fixing device
Pattern generator
White 70% input
SCREEN
<Fig.9> Equipment composition Diagram
<Fig.8-2> TEST pattern (RED pattern)

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PRINTED CIRCUIT BOARD
MAIN(TOP)

- 19 -
MAIN(BOTTOM)

- 20 -
DMD(TOP)
DMD(BOTTOM)