promethean PRM-20 User manual

PRODUCT CODE
1 122 483 18 (KM5YC)
1 122 483 19 (KM5ZC)
Original Version
REFERENCE NO. SM5111026-00
Model No. PRM-20
PRM-20(S)
U.S.A. Canada
Europe, U.K
Multimedia Projector
SERVICE MANUAL
FILE NO.
Chassis No. KM5-2000
KM5-20(S)00
Match the Chassis No. on the unit's back cover with the Chassis
No. in the Service Manual.
If the Original Version Service Manual Chassis No. does not
match the unit’s, additional Service Literature is required. You
must refer to “Notices” to the Original Service Manual prior to
servicing the unit.

-2-
Contents
SERVICE MANUAL ....................................................... 1
Safety Instructions ......................................................... 3
SAFETY PRECAUTIONS........................................... 3
PRODUCT SAFETY NOTICE..................................... 3
SERVICE PERSONNEL WARNING........................... 3
Battery Replacement Notice....................................... 3
Specifications ................................................................ 4
Circuit Protections ......................................................... 5
Thermal switch ........................................................... 5
Lamp cover switch ...................................................... 5
Fuse............................................................................ 6
Warning temperature and power failure protection..... 6
Maintenance.................................................................. 7
Air filter care and cleaning .......................................... 7
Resetting the Filter Counter........................................ 7
Attaching the Lens Cover ........................................... 8
Cleaning the Projection Lens...................................... 9
Cleaning the Projector Cabinet................................... 9
Lamp Replacement ..................................................... 10
Lamp Replacement .................................................. 10
How to check Lamp used time.................................. 11
Security Function Notice.............................................. 12
Security Function Disable......................................... 12
Antitheft Alarm Function Disable .............................. 12
Service Port................................................................. 13
Switch of standby mode............................................ 13
Mechanical Disassembly ............................................. 14
Optical Parts Disassembly........................................... 19
Panel Type Check ..................................................... 22
Adjustments................................................................. 25
Adjustments after Parts Replacement ...................... 25
Electrical Adjustments ................................................. 29
Service Adjustment Menu Operation........................ 29
Memory IC (IC1391) Replacement........................... 29
Circuit Adjustments................................................... 30
Test Points and Locations......................................... 34
Service Adjustment Data Table................................. 35
Chassis Block Diagrams.............................................. 51
Chassis over view..................................................... 51
System control.......................................................... 52
Lamp control............................................................. 53
Audio circuit .............................................................. 54
Power supply & protection circuit.............................. 55
Fan control circuit ..................................................... 56
Alarm circuit.............................................................. 57
IIC bus control circuit ................................................ 58
Network circuit .......................................................... 59
Troubleshooting ........................................................... 60
Indicators and Projector Condition ........................... 60
No Power .................................................................. 61
No Picture................................................................. 62
No Sound.................................................................. 63
Control Port Functions................................................. 64
Scaler I/O Port Functions (PW190) .......................... 64
I/O Expander Port Functions (TE7783) ................... 65
Waveform .................................................................... 66
IC Block Diagrams....................................................... 67
Electrial Parts List........................................................ 75
Electrical Parts Location ........................................... 76
Electrical Parts List ................................................... 77
Mechanical Parts List .................................................. 96
Cabinet Parts Location ............................................. 96
Optical Parts Location .............................................. 97
Mechanical Parts List ............................................. 101
Diagrams & Drawings..................................................A1
Parts description and reading in schematic diagram...A2
Schematic Diagrams ...................................................A3
Printed Wiring Board Diagrams .................................A11
Pin description of diode, transistor and IC.................A15
Note on Soldering......................................................A16

-3-
Safety Instructions
WARNING:
The chassis of this projector is isolated (COLD) from AC line by using the converter transformer. Primary side
of the converter and lamp power supply unit circuit is connected to the AC line and it is hot, which hot circuit
is identified with the line ( ) in the schematic diagram. For continued product safety and protection of per-
sonnel injury, servicing should be made with qualified personnel.
The following precautions must be observed.
SAFETY PRECAUTIONS
1: An isolation transformer should be connected in
the power line between the projector and the AC
line before any service is performed on the projec-
tor.
2: Comply with all caution and safety-related notes
provided on the cabinet back, cabinet bottom,
inside the cabinet or on the chassis.
3: When replacing a chassis in the cabinet, always
be certain that all the protective devices are
installed properly, such as, control knobs, adjust-
ment covers or shields, barriers, etc.
DO NOT OPERATE THIS PROJECTOR WITHOUT T
HE PROTECTIVE SHIELD IN POSITION AND PROP
ERLY SECURED.
4: Before replacing the cabinet cover, thoroughly
inspect the inside of the cabinet to see that no
stray parts or tools have been left inside.
Before returning any projector to the customer, the
service personnel must be sure it is completely
safe to operate without danger of electric shock.
SERVICE PERSONNEL WARNING
Eye damage may result from directly viewing the light produced by the Lamp used in this equipment. Always
turn off Lamp before opening cover. The Ultraviolet radiation eye protection required during this servicing.
Never turn the power on without the lamp to avoid electric-shock or damage of the devices since the stabilizer
generates high voltages (15kV - 25kV) at its starts.
Since the lamp is very high temperature during units operation replacement of the lamp should be done at
least 45 minutes after the power has been turned off, to allow the lamp cool-off.
PRODUCT SAFETY NOTICE
Product safety should be considered when a component replacement is made in any area of the projector.
Components indicated by mark !in the parts list and the schematic diagram designate components in which
safety can be of special significance. It is, therefore, particularly recommended that the replacement of there
parts must be made by exactly the same parts.
Battery Replacement Notice
Caution
Danger of explosion if battery is incorrectly replaced. Replace only with the same or equivalent type
recommended by the manufacturer. Dispose of used batteries according to the manufacture’s instructions.
Replace Battery With SANYO Electric Co., Ltd., Part No. 945 088 6837 Only. Use of Another Battery May
Present A Risk Of Fire or Explosion.

-4-
Specifications
This symbol on the nameplate means the product is Listed by Underwriters
Laboratories Inc. It is designed and manufactured to meet rigid U.L. Safety stan-
dards against risk of fire, casualty and electrical hazards.
● The specifications are subject to change without notice.
● LCD panels are manufactured to the highest possible standards. Even though 99.99% of the pixels are effective, a tiny
fraction of the pixels (0.01% or less) may be ineffective by the characteristics of the LCD panels.
Mechanical Information
Projector Type Multi-media Projector
Dimensions (W x H x D) 12.59" x 5.73" x 11.85" (319.9 mm x 145.5 x 300.9 mm) (Not including protrusions)
Net Weight 7.5 lbs (3.4 kg)
Feet Adjustment 0˚ to 10.0˚
Panel Resolution
LCD Panel System 0.59” TFT Active Matrix type, 3 panels
Panel Resolution 1,280 x 800 dots
Number of Pixels 3,072,000 (1,280 x 800 x 3 panels)
Signal Compatibility
Color System PAL, SECAM, NTSC, NTSC4.43, PAL-M, and PAL-N
High Definition TV Signal 480i, 480p, 575i, 575p, 720p, 1035i, and 1080i
Scanning Frequency H-sync. 15–100 kHz, V-sync. 50–100 Hz
Optical Information
Projection Image Size (Diagonal) Adjustable from 50” to 110”
Projection Lens F 1.8 lens with f 6.6 mm with manual focus
Throw Distance 1.77' - 3.94' (0.53 m - 1.20 m)
Projection Lamp 200 W
Interface
Video Input Jack RCA Type x 1
S-Video Input Jack Mini DIN 4 pin x 1
Audio Input Jacks RCA Type x 2
Computer Input 1 / Component Input Terminal Analog RGB (Mini D-sub 15 pin) Terminal x 1
Computer Input 2 / Monitor Output Terminal Analog RGB (Mini D-sub 15 pin) Terminal x 1 (In/Out switchable)
Computer/ Component Audio Input Jack Mini Jack (stereo) x 1
Service Port Connector Mini DIN 8 pin x 1
LAN Connection Terminal 100 Base-TX (100Mbps)/10Base-T (10Mbps), RJ45
Audio Output Jack Mini Jack (stereo) x 1 (Variable)
Audio
Internal Audio Amp 1.0 W RMS
Built-in Speaker 1 speaker, ø1.1” (28 mm)
Power
Voltage and Power Consumption AC 100–120 V (3.2 A Max. Ampere), 50/60 Hz (The U.S.A and Canada)
AC 200–240 V (1.6 A Max. Ampere), 50/60 Hz (Continental Europe and The U.K.)
Operating Environment
Operating Temperature 41˚F–95˚F (5˚C–35˚C)
Storage Temperature 14˚F–140˚F (-10˚C–60˚C)
Remote Control
Battery AA or LR6 1.5V ALKALINE TYPE x 2
Operating Range 16.4’ (5 m)/±30˚
Dimensions 1.9” (W) x 0.87” (H) x 5.7” (D) (49 mm x 22 mm x 145.3 mm)
Net Weight 3.53 oz (100 g) (including batteries)
Antitheft Alarm
Battery CR2 3V LITHIUM BATTERY x 1

-5-
Lamp cover switch
The lamp cover switch (SW901) cuts off the drive signal to the lamp
circuit when the lamp cover is removed or not closed completely.
After opening the lamp cover for replacing the lamp ass’y, place the
lamp cover correctly otherwise the projector can not turn on.
Thermal switch
There is the thermal switch (SW902) inside of the projector to de-
tect the internal temperature rising abnormally. When the internal
temperature reaches near 105˚C, the thermal switch opens to stop
the operation of the power supply circuit.
The thermal switch cannot be reset itself automatically even if the
internal temperature becomes normal. Reset the thermal switch
following to the below procedure.
How to reset the thermal switch
1. Remove the cabinet top, cabinet front and main board and then
remove the power box top cover.
2. Press the reset button on the thermal switch in the power box.
CAUTION:
Before press the reset button, make sure that the AC cord must
be disconnected from the AC outlet.
This projector provides the following circuit protections to operate in safety. If the abnormality occurs inside the pro-
jector, it will automatically turn off by operating one of the following protection circuits.
Circuit Protections
SW901
Thermal switch (SW902)

-6-
Circuit Protections
Fuse
A fuse is located inside of the projector. When the POWER indica-
tor is not lightning, the fuse may be opened. Check the fuse as
following steps.
The fuse should be used with the following type;
Fuse Part No.: 323 021 7804
TYPE T6.3AH 250V FUSE
LITTLE FUSE INC. TYPE 21506.3
How to replace the fuse
1. Remove the lamp cover and fuse cover as shown in figure.
2. Take the fuse out from the aperture, and replace the new one
with the specified type.
Fuse
Fuse cover
Warning temperature and power failure protection
The projector will be automatically turned off when the internal temperature of the projector is abnormally high, or
the cooling fans stop spinning, or the power supplies in the projector are failed.
- If the WARNING indicator is flashing, it may detect the abnormal temperature inside the projector. Check the follow-
ing possible causes and wait until the WARNING indicator stops flashing, and then try to turn on the projector.
- If the WARNING indicator lights red, it may defect the cooling fans or power supply circuits. Check fans operation
and power supply lines referring to the chapter “Power supply & protection circuit” in the Chassis Block Diagram
section.
Possible causes
- Air filters are clogged with dust particles. Remove dust from the air filters by following instructions in the “Air filter
care and cleaning” below.
- Ventilation slots of the projector are blocked. In such an event, reposition the projector so that ventilation slots are
not obstructed.
- Check if projector is used at higher temperature place (Normal operating temperature is 5 to 35 ˚C or 41 to 95˚F)
REPLACE
POWER WARNING
LAMP
Top Panel
WARNING indicator

-7-
Maintenance
Air filter care and cleaning
Air filters prevent dust from accumulating on the optical elements inside the projector. Should the air filters become
clogged with dust particles, it will reduce cooling fans’ effectiveness and may result in internal heat build up and
adversely affect the life of the projector. Clean the air filters following the steps below.
Air filters
Pull up and remove.
RECOMMENDATION:
We recommend avoiding dusty/smoky environments
when operating the projector. Usage in these
environments may cause poor image quality.
When using the projector under dusty or smoky conditions, dust may accumulate on a lens, LCD panels, or optical
elements inside the projector. This condition may degrade the quality of a projected image.
When the symptoms above are noticed, contact your authorized dealer or service station for proper cleaning.
CAUTION:
Do not operate the projector with the air filters removed.
Dust may accumulate on the LCD panel and the projection
mirror degrading picture quality.
Do not put small parts into the air intake vents. It may result
in malfunction of the projector.
1. Turn off the projector, and disconnect the AC power cord
from the AC outlet.
2. Turn over the projector and remove the air filters by pulling
the latches upward.
3. Clean the air filters with a brush or rinse them softly.
4. When cleaning the air filters by rinsing, dry them well.
Replace the air filters properly. Make sure that the air fil-
ters are fully inserted.
Be sure to reset the Filter counter after cleaning or replacing the filters.
Press the MENU button to display the On-Screen
Menu. Use the Point 7 8 buttons to move the red
frame pointer to the Setting Menu icon.
Use the Point ed buttons to move the red frame
pointer to Filter counter and then press the SELECT
button. A dialog box appears showing the total
accumulated time of the filter use, a timer setting
option, and the reset option. Select Reset and the
“Filter counter Reset?” appears. Select [Yes] to
continue.
1
2
Resetting the Filter Counter
Filter counter
Another confirmation dialog box appears, select [Yes]
to reset the Filter counter.
3
Select Reset and
the “Filter counter
Reset?” appears.
Select [Yes],
then another
confirmation
box appears.
Select [Yes] again
to reset the Filter
counter.

-8-
Maintenance
Cleaning with air spray
1. Remove the cabinet top following to“ Mechanical
Disassemblies”.
2. Clean up the LCD panel and polarizing plate by using
the air spray from the cabinet top opening.
Caution:
Use a commercial (inert gas) air spray designed for
cleaning camera and computer equipment. Use a
resin-based nozzle only. Be vary careful not to damage
optical parts with the nozzle tip. Never use any kind of
cleanser on the unit. Also, never use abrasive materials
on the unit as this may cause irreparable damage.
After long periods of use, dust and other particles will accumulate on the LCD panel, prism, mirror, polarized
glass, lens, etc., causing the picture to darken or color to blur. If this occurs, clean the inside of optical unit.
Remove dust and other particles using air spray. If dirt cannot be removed by air spray, disassemble and clean
the optical unit.
Disassembly Cleaning
Disassembly cleaning method should only be per-
formed when the unit is considerable dirty and cannot
be sufficiently cleaned by air spraying alone.
Be sure to readjust the optical system after per-
forming disassembly cleaning.
1. Remove the cabinet top and main units following to
“ Mechanical Disassemblies”.
2. Remove the optical base top following to “Optical
Unit Disassemblies”. If the LCD panel needs
cleaning, remove the LCD panel unit following to
“ LCD panel replacement”.
3. Clean the optical parts with a soft cloth. Clean
extremely dirty areas using a cloth moistened with
alcohol.
Caution:
The surface of the optical components consists of
multiple dielectric layers with varying degrees of
refraction. Never use organic solvents (thinner, etc.) or
any kind of cleanser on these components.
Since the LCD panel is equipped with an electronic
circuit, never use any liquids (water, etc.) to clean the
unit. Use of liquid may cause the unit to malfunction.
Attaching the Lens Cover
When moving the projector or while it is not in use, replace
the lens cover.
1
2
Thread the string through the hole on the lens cover
and then tie a knot in the string to secure it in place.
Thread the other end of the string through the hole on
the bottom of the projector. Then pass the lens cover
through the resulting loop of the string and pull it to
tighten the knot.
1
2

-9-
Maintenance
Cleaning the Projector Cabinet
Unplug the AC power cord before cleaning.
Gently wipe the projector body with a soft dry cleaning
cloth. When it is heavily soiled, use a small amount of
mild detergent and finish with the cleaning cloth. Avoid
excessive use of cleaner. Abrasive cleaners, solvents, or
other harsh chemicals might scratch the surface of the
cabinet.
When the projector is not in use, put the projector in an
appropriate case to avoid dust and being scratched.
Unplug the AC power cord before cleaning.
First, remove the dust with a blower. Then gently wipe the
lens surface. Use a lens cleaning paper moistened with
methyl alcohol (methanol). Avoid excessive use of cleaner.
Do not use abrasive cleaners, solvents, or other harsh
chemical cleaners to avoid damages the lens.
When the projector is not in use, replace the lens cover.
Cleaning the Projection Lens
CAUTION
This projector is equipped with a plastic lens.
Do not rub the lens with a hard fiber cloth or hit it with something hard to prevent the lens from scratching.
Do not use a chemical cleaner (liquid and solid) to avoid deteriorating the lens.

-10-
Lamp Replacement
Follow these steps to replace the lamp.
Lamp
ORDER REPLACEMENT LAMP
Replacement lamp can be ordered through your dealer. When ordering a projection lamp, give the following
information to the dealer.
●Model No. of your projector : PRM-20/PRM-20(S)
●Replacement Lamp Type No. : POA-LMP126POA-LMP126
(Service Parts No. 610 340 8569)
For continued safety, replace with a lamp of the
same type. Do not drop a lamp or touch a glass
bulb! The glass can shatter and may cause injury.
Allow the projector to cool for at least 45 minutes
before you open the Lamp cover. The inside of the
projector can become very hot.
CAUTION
Screw
Turn off the projector and unplug the AC power cord.
Let the projector cool for at least 45 minutes.
Remove the two screws that secure the lamp. Lift the
lamp out of the projector by using the built in handle.
1
3
Replace the lamp with a new one and secure it with
the two screws. Make sure that the lamp is set
properly. Put the lamp cover back and secure it with
the screw.
4
Turn the projector over. Remove the screw that
secures the lamp cover, and then open the lamp cover.
2
Connect the AC power cord to the projector and turn
on the projector.
6Reset the lamp replacement counter.
See “Lamp Replacement Counter” on the next page.
5
Handle
Screw
CAUTION
Screw
Lamp Cover
When the projection lamp of the projector reaches the end
of its life, the LAMP REPLACE indicator emits a yellow light.
If this indicator lights yellow, replace the lamp with a new
one promptly.
Top Panel
Lamp Replacement
WARNING:
TURN OFF THE UV LAMP BEFORE
OPENING THE LAMP COVER.
USE UV RADIATION EYE AND SKIN PRO-
TECTION DURING SERVICING.
REPLACE
POWER WARNING
LAMP
This indicator
turns yellow
when the
projection lamp
reaches the end
of its life.
✔Note:
The Lamp replacement icon will not appear
when the Display function is set to “Off” ,
during “Freeze” or “No show” .
Lamp replacement icon

-11-
Lamp Replacement
Be sure to reset the Lamp replacement counter after the lamp is replaced. When the Lamp replacement
counter is reset, the LAMP REPLACE indicator stops lighting.
Turn the projector on and press the MENU button to
display the On-Screen Menu. Use the Point buttons to
move the red frame pointer to the Setting Menu icon.
Use the Point buttons to move the red frame pointer
to Lamp counter and then press the SELECT button.
The first dialog box appears showing the total
accumulated lamp time and reset option. If you select
Reset, “Lamp replacement counter Reset?” appears.
Select “Yes” to continue.
1
2
Another confirmation dialog box appears, and select
“Yes” to reset the Lamp replacement counter.
3
Lamp Replacement Counter
✔Note:
Do not reset the Lamp replacement counter without
implementing lamp replacement. Be sure to reset the
Lamp replacement counter only after replacing the lamp.
Lamp counter
Lamp counter
To reset the lamp
counter, move the
pointer to Reset
and then press the
SELECT button. the
“Lamp replacement
counter Reset?”
dialog box appears.
Select “Yes,” then
another confirmation
box appears.
Select “Yes” again to reset
the lamp counter.
How to check Lamp used time
The LAMP REPLACE indicator will light yellow when
the total lamp used time (Corresponding value) reaches
3000 hours. This is to indicate that lamp replacement is
required.
The total lamp used time (Corresponding value) is calcu-
lated by using the below expression,
Total lamp used time = Tnormal + Thigh x 2
Tnormal : used time in the Normal mode
Thigh : used time in the High and Auto mode
You can check the lamp used time following to the be-
low procedure.
1Press and hold the ON-OFF button on the remote
control for more than 20 seconds.
2 The projector used time and lamp used time will be
displayed on the screen briefly as follows.
Counter
Projector 525H
Lamp
High 150H
Normal 375H
Corresponding value 675H
Total lamp used time
Projector used time

-12-
Side Control
F button button 1, 2, 3
Security Function Notice
Antitheft Alarm Function Disable
This projector provides an Antitheft alarm function which
works when detecting a vibration to protect the projec-
tor from a suspicious person.
Release the alarm setting
Press the Fbutton and input the four-digit PIN code
within 10 seconds. (default PIN code "1111") When the
alarm is released, you will hear high-pitched confirmation
sound.
When inputting an incorrect PIN code, you will hear low-
pitched sound. If you input incorrect PIN codes 3 times,
the alarm will start ringing.
If you forget the PIN code to release the alarm setting,
press and hold the button 3 and F button at the same
time for more than 3 seconds.
This projector provides security functions such as "PIN code lock" and "Logo PIN code lock". When the projector has
set these security function on, you are required to enter correct PIN code to use the projector. If you do not know
the correct PIN code to the projector, the projector can no longer be operated or started. In this case, you must reset
those function first according to the resetting procedure described below and then check up on the projector.
Resetting procedure
1Turn the projector off (in the standby mode).
2Press and hold the 7and 8button on the remote control at the same time for more than 10 seconds. The PINThe PIN
code and Logo PIN code will be reset to the factory initial setting code.
Please refer to the owner's manual for further information of the security functions.
Function Description
PIN code lock
Prevents the projector from being operated by an un-
authorized person.
Initial code: “1234”
Logo PIN code lock
Prevents an unauthorized person for changing the
start-up logo and captured image on the screen.
Initial code: “4321”
Security Function Disable

-13-
S-VIDEO IN
MONITOR OUT
COMPUTER IN 2 /
COMPUTER /
COMPONENT
AUDIO IN
R
VIDEO IN
L
(MONO)
(VARIABLE)
AUDIO OUT
Service Port
Switch of standby mode
Standby mode "Eco" : Super standby mode
Standby mode "Normal": Normal standby mode
The standby mode is factory default set "Eco".
In standby state, when you use the projector via network, the item of the standby mode in the setting menu must
be set to "Normal".
Change to “Eco” when you do not use the projector via network.
(Power consumption when standing by increases in the state of "Normal". )
Service Port
Standby mode

-14-
zCabinet Top & Fans (FN901, FN902), R/C Board removal
Mechanical Disassembly
Mechanical disassembly should be made following procedures in numerical or-
der.
Following steps show the basic procedures, therefore unnecessary step may
be ignored.
Caution:
The parts and screws should be placed exactly the same position as the original
otherwise it may cause loss of performance and product safety.
Screws Expression
(Type Diameter x Length) mm
T Type M Type
A (M3x8)x5
Cabinet top
Side grille
FN901
FN902
D (T3x6)
Fig.1
C (T3x6)
R/C board
B (T3x6)
LED spacer
1. Remove 7 screws A (M3x8) to remove the Cabinet top.
2. Remove screw B (T3x6) to remove the R/C board.
3. Remove screw C (T3x6) to remove the Side grille.
4. Remove screw D (T3x6) to remove the FN901 and FN902.
A
A
A
A
A A

-15-
xMain Board, Rear Panel, Fan (FN905), SP901 removal
Mechanical Disassembly
Fig.2
1. Remove 2 screws A (M2.5x6) to remove the Lamp Spacer Sheet.
2. Remove 7 screws B (M2.5x6) and screw C (M2.5x8) to remove the Main
Board and remove screw D (M4x5) to remove the Grounding lead.
3. Remove Rear Panel.
4. Remove screw E (T3x8) to remove the Lamp Mounting Duct and the
FN905.
5. Remove the speaker (SP901).
Main Board
Rear Panel
FN905
Lamp Mounting
Duct
(M2.5x6)x7
(M4x5)
E (T3x8)
Grounding
lead
(M2.5x6)x2
A
B
B
B
C (M2.5x8)
B
B
B
B
D
Lamp Spacer Sheet

-16-
FN906
Mechanical Disassembly
cPower, Line Filter, Ballast Board,Thermal Switch (SW902), Fan (FN906) removal
Fig.3
Power Board
Ballast Board
Isolation sheet Ass'y
Ballast socket
Thermal switch
(SW902)
A (T3x6)x4
(T3x6)x2
(T3x6)x2
(T3x6)x4
Line Filter Board
H (M3x8)
(T3x6)
E (T3x6)
(T3x6)x2 (Black)
1. Remove the Isolation sheet Ass'y.
2. Remove 4 screws A (T3x6) to remove the Power Board and 2 screws B (T3x6) to remove
SW902.
3. Remove 4 screws C (T3x6) to remove the Ballast Board.
4. Remove 2 screws D (T3x6) , screw E (T3x6) and 2 screws F (T3x6) to to remove the Power
Board Holder.
5. Remove screw G (T3x6) to remove the Line Filter Board and the Line Filter Board Holder.
6. Remove the fan (FN906).
7. Remove screw H (M3x8) to remove the Ballast socket.
A
A
A
D
D
B
B
C
C
C
C
Power Board Holder
Line Filter
Board Holder
G (T3x6)
F
F

-17-
Mechanical Disassembly
Fig.4
vOptical Unit, Fans (FN903, FN904), Noise Filter removal
Noise filter
Optical unit
FN904
FN903
G (T3x8)
F (T3x6)x3
D (T3x6)
C (T3x6)x2
A (T3x8)x6
B (T3x12)x2
1. Remove the Lens top spacer sheet.
2. Remove 6 screws A (T3x6) and 2 screws B (T3x12) to remove the Optical unit.
3. Remove the Lens bottom spacer sheet.
4. Remove 2 screws C (T3x6) to remove the Noise filter.
4. Remove screw D (T3x6) to remove the PBS Duct.
5. Remove 4 screws E (T3x10) and 3 screws F (T3x6) to remove the Duct Top and the Noise filter
spacer sheet.
6. Remove screw G (T3x8) to remove the fans (FN903 and FN904), Remove the LCD Panel Duct Top
and LCD Panel Duct Bottom .
Lens top spacer sheet
B
Lens bottom spacer sheet
A
A
A
A
A
E (T3x10)x4
C
EE
E
F
F
Noise filter spacer sheet
PBS Duct
Panel Duct Top
Panel Duct Bottom
Duct Top

-18-
Mechanical Disassembly
Fig.5
bAlarm-A and Alarm-B board removal
Alarm-B Board
C (M3x8)
A (T3x6)x4
Alarm-A Board
Battery
Battery cover
Switch cover
B (M3x8)
D(T3x6)x2
LED Spacer
D
1. Remove 4 screws A (T3x6) to remove the Alarm_A Board, LED Spacer and Alarm_B Board.
2. Remove screw B (M3x8) to remove the Battery cover and the Battery.
3. Remove screw C (M3x8) to remove the Swicth cover.
4. Remove screw D (T3x6) to remove the Alarm Board Holder.
A
A A
Alarm Board Holder

-19-
Optical Parts Disassembly
Before taking this procedure, remove Cabinet Top, Main Board and the Lamp Spacer Sheet following to the
"Mechanical Disassembly”.
Disassembly requires a 2.0mm hex wrench.
Fig.1
zProjection lens removal
xIntegrator lens-in disassembly
Hooks
Integrator lens-in
Integrator Lens-In Ass'y
(M3x8)x4
(M2.5x5)x2
Fig.2
Projection lens
* Flat surface (Behind)
Note on replacing the Projection Lens
- When the Projection Lens is replaced with the new
one, make sure that the fixing tape must be removed
as the figure.
Fixing tape
Note on replacing the Projection Lens
- When the Projection Lens is replaced with the new
one and reassembled, please make the lens near the
side to the Prism and fix it.

-20-
Optical Pats Disassembly
cRelay lens disassembly
Relay lens
Relay lens Ass'y
(M2.5x5)x2
(M2x3)
vPolarized glass-in disassembly
Polarized glass
Polarized glass-in Ass'y
(M2.5x5)x1
Fig.3
Fig.4
Film side