Sanyo PLV-70 User manual

FILE WITH ORIGINAL SERVICE MANUAL
SM5110361 for PLV-70
SS5110737 for PLV-70L
PRODUCT CODE
PLV-70 PLV-70L
1 122 130 60 1 122 130 70
1 122 131 60 1 122 131 70
1 122 131 62 REFERENCE NO. SM5110361-05
FILE NO.
Notice
CORRECTION ●PRODUCTION CHANGE
SERVICE FLASH ADD INFORMATION
REVISION-5
Please add this notice to the Service Manual listed below.
Category : Multi-media Projector Issued Date : July / 2005
PLV-70 M4L-7004
Model : PLV-70L Effective from : Chassis No. M4L-70L01
Canada, U.S./Europe,
Destination : Asia, Africa, U.K. REF. NO. : SM5110361
NOTE: Match the Chassis No. on the unit’s back cover with the Chassis No. in the Service
Manual.
If the Chassis. No. does not match the unit’s, additional service literature is required.
Only the difference service information is given in this manual. For detailed service
information, refer to the original service manual and notice for Models PLV-70, PLV-70L.
Reason of the production change:
As this production change is to comply with RoHS, PWB units and some parts are changed.
Major chaged parts are as follows;
PWB BOARD
Main Board
A/V Board
I/F Board
Control Baord
RC Front Baord
Connect Board
Senser1 Board

-2-
■ Contents
Contents ____________________________________________________ 2
Safety Instructions ____________________________________________ 3
Specifications ________________________________________________ 4
Adjustments after Parts Replacement _____________________________ 5
Circuit Protections ____________________________________________ 6
Fuse _______________________________________________________ 6
Thermal switch _______________________________________________ 6
Interlock switch _______________________________________________ 6
Warning temperature and power failure protection ___________________ 7
Mechanical Disassemblies ______________________________________ 8
Optical Parts Disassemblies ____________________________________ 13
LCD Panel/Prism Ass’y Replacement ____________________________ 18
Lamp Replacement __________________________________________ 19
Optical Adjustments __________________________________________ 20
Electrical Adjustments ________________________________________ 23
Service Adjustment Menu Operation _____________________________ 23
Circuit Adjustments ___________________________________________ 24
Test Points and Locations ______________________________________ 29
Service Adjustment Data Table _________________________________ 30
Electrical Parts List ___________________________________________ 44
Mechanical Parts List _________________________________________ 67
Optical Parts List ____________________________________________ 70

-3-
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.
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
personnel 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 projector.
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, adjustment
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.
■ Safety Instructions

-4-
■ Specifications
● The specifications are subject to change without notice.
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
standards against risk of fire, casualty and electrical hazards.
Projector Type Multi-media Projector
Dimensions (W x H x D) 12.6” x 6.6” x 16.8” (319mm x 168mm x 429.5mm)
Net Weight 17.4 lbs (7.9 kg) PLV-70, 17.1 lbs (7.1 kg) PLV-70L
LCD Panel System 1.21” TFT Active Matrix type, 3 panels
Panel Resolution 1366 x 768 dots
Number of Pixels 3,147,264 (1366 x 768 x 3 panels)
Color System 6 color system (PAL, SECAM, NTSC, NTSC4.43, PAL-M and PAL-N)
High Definition TV SIgnals 480i, 480p, 575i, 575p, 720p. 1035i and 1080i
Scanning Frequency H-sync. 15 ~ 100kHz, V-sync. 50 ~ 100Hz
Projection Image Size (diagonal) Adjustable from 31” to 400”
Horizontal Resolution 800 TV lines (HDTV)
Projection Lens F 1.8 ~2.1 lens with f=48.4mm ~ 62.8mm with motor zoom and focus
Throw Distance 5.0’ ~ 51.3’ (1.5m ~ 15.6m)
Motorized Lens Shift Up and Down
Projection Lamp 200 watts
Input 1 Jacks DVI Terminal (Digital), HDB 15-pin Terminal (Analog) and Stereo Mini Type
Jack (Audio)
Input 2 Jacks BNC Type x 5 (G or VIDEO/Y, B or Cb/Pb, R or Cr/Pr, H and V), Stereo
Mini Type Jack (Audio)
Input 3 Jacks RCA Type x 3 (VIDEO/Y, Cb/Pb, Cr/Pr), RCA Type x 2 (Audio R and L) and
DIN 4-pin (S-Video)
Other Jacks DIN 8-pin (Control port), Wired Remote Jack and Network Board Connector
Jack
Built-in Speakers 2 speakers Stereo (R and L), 2 watts RMS (T.H.D. 10%)
Feet Adjustment 0˚ to 10.5˚
Voltage and AC 100 ~ 120V (3.6A Max. Ampere), 50/60Hz (The U.S.A and Canada)
Power Consumption AC 200 ~ 240V (1.8A Max. Ampere), 50/60Hz (Continental Europe and the U.K)
Operating Temperature 41 ˚F ~ 95 ˚F (5˚C ~ 35˚C)
Storage Temperature 14 ˚F ~ 140 ˚F (-10˚C ~ 60˚C)

-5-
Condenser lens adjustment ❍ ●
Relay lens adjustment ❍ ●
Contrast Adjustment
R-Contrast adjustment ●
G-Contrast adjustment ●
B-Contrast adjustment ●
Output voltage adjustment ●
+16 V adjustment ●
Video center adjustment ●
NRS adjustment ●
PC pedestal adjustment ●
PC gain adjustment ●
Black level adjustment ●
PC gamma shift adjustment ●
A/D reference adjustment ●
AV pedestal adjustment ●
A/D input adjustment ●
Video pedestal adjustment ●
Video gain adjustment ●
HDTV pedestal adjustment ●
HDTV Gain adjustment ●
Video gamma shift adjustment ●
Common center adjustment ● ●
White balance adjustment ❍ ❍
Disassembly / Replaced Parts
Condenser
Lens
Polarized glass
R G B
Optical Adjustments
Electrical Adjustments
● : Adjustment necessary ❍ : Check necessary
Sub Power
Board Main Board
Relay
Lens
■ Adjustments after Parts Replacement
Power
Board

-6-
● Interlock switch
The interlock switch (SW902) cuts off the AC mains power supply
when the lamp cover is removed. 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 (SW905) inside of the projector to
prevent the internal temperature from rising abnormally. When
the internal temperature reaches near 90˚C, turn off the AC main
power supply automatically.
The thermal switch is not reset to normal automatically even if the
internal temperature becomes normal. Reset the thermal switch
following procedure.
Check the resistance between terminals of thermal switch by
using the tester. If it has high impedance, thermal switch may be
in operative.
How to reset the thermal switch
1. Loosen 2 screws and open the lamp cover.
2. Press the reset button on the thermal switch with a sharp-
pointed tool.
CAUTION:
Before press the reset button, disconnect the AC cord from the
projector.
This projector is equipped with the following circuit protections to operate in safety. If the abnormality occurs inside
the projector, it will automatically turn off by operating one of the following protection circuits.
● Fuse
The fuse is located inside of the projector. When either the LAMP
indicator or the READY indicator is not illuminated, fuse may be
opened. Check the fuse as following steps.
It should be used the specified fuse as follows;
Fuse Part No.: 423 025 1201
TYPE T8AH 250V FUSE
LITTEL FUSE INC. TYPE 215008
How to replace the fuse
1. Remove the cabinet top following to “Mechanical
Disassemblies”.
2. Remove the fuse from fuse holder.
To install the fuse, take reversed step in the above.
Fuse Line Filter Board
Interlock switch
Thermal switch
Lamp cover
■ Circuit Protections

-7-
Circuit Protections
● Warning temperature and power failure protection
The TEMP WARNING indicator flashes red and the projector will automatically turn off when the internal
temperature of the projector exceeds the normal temperature or when stopping cooling fans or when the internal
power supply lines are failed.
Check the following possible causes and wait until stopping the TEMP WARNING indicator flashing.
Possible causes
- Air filter is clogged with dust particles. Remove dust from the air filter 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)
If the TEMP WARNING indicator still continues to flash, there may be defects on cooling fans or power supply
circuits. Please check fan operation and power supply lines referring to the “Power Supply Lines Chart”.
Air filter care and cleaning
The removable air filter prevents dust from accumulation on the surface of the projection lens and projection mirror.
Should the air filter become clogged with dust particles, it will reduce the cooling fan’s effectiveness and may result
in internal heat build up and reduce the life of the projector.
To clean up the air filters, follow the cleaning procedure below:
1. Turn the power off, and disconnect the AC power cord
from the AC outlet.
2. Turn the projector up side down and remove an air
filters by pulling the latches of them upward.
3. Clean the air filters with brush or wash out the dust and
particles.
4. Replace each air filter properly. Make sure that the air
filters are fully inserted.
CAUTION:
Do not operate the projector with the air filter removed. The
dust is stuck on the LCD panel and the mirror, and it may
spoil the fine picture image.
Do not put the small parts into the air intake vents. It may
result in the malfunction of the projector. The air filter is
small parts. Take care that children don’t eat or swallow it.
RECOMMENDATION
We recommend to avoid dusty, smoky place for operating
the projector. Using in dusty place may cause the picture of poor quality.
When using under the dusty or smoky conditions, dust may accumulate on the LCD panel and lens inside it, and
may resultantly be projected on the screen together with the picture.
When the above symptoms are noticed, please clean up the LCD panel and lens following to the “Cleaning
Method”.
Air filters

-8-
Mechanical disassemble should be made following procedures in numerical order.
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.
Fig.1
Fig.2-2
1 Remove 5 screws A, 2 screws B, and loosen 2 screws C,
and then take the Cabinet Top upward off.
Note: If you want to remove the Cabinet Front-Top only,
you do not need to remove screws A. Remove 2 screws B
and Lens Front Cover.
1 Cabinet Top removal
1 Turn the Lens Front Cover counter-clockwise and to take
it off by pulling forward as shown in Fig.2-1.
2 Remove the Cabinet Front-Top, Lens Cover Holder and
Lens Cover upward off.
3 Remove 2 screws D to take the Cabinet Front off.
4 Remove the RC Board and speakers on the Cabinet
Front.
2 Cabinet Front removal
UP
Fig.2-1
C
B
A
A
A
A
B
A
D
D
Cabinet Front-Top
Lens
Front
Cover
Lens Cover Holder
Cabinet Front
Lens Cover
C
■ Mechanical Disassemblies

-9-
Mechanical Disassemblies
1 Remove 7 screws to take the Main Board upward.
Fig.3
Fig.4
1 Remove 1 screw A and take the Rear Panel ass’y
upward off.
2 Remove 4 screws B to take the fan (FN905) off.
3 Remove 5 screws C and 1 screw D to take AV Board
from the Rear Panel ass’y off.
4 Remove 2 screws E and grounding leads and then
pull up the I/F Board and Holder assy from the bottom
cabinet.
5 Remove 4 screws F to take the I/F Board.
3 Main Board removal
4 AV, I/F Board & Rear Panel removal
Main Board
A
B
B
B
B
C
D
Rear Panel Ass’y
FN905
AV Board
I/F Board
F
F
F
FEE

-10-
Mechanical Disassemblies
1 Remove 4 screws A to take the Ballast Cover upward
off.
2 Remove 2 screws B to take the Fan (FN903) off.
3 Remove the Sub Power Board and Drive Board by
pulling them upward.
Fig.5
5 Lamp Ballast Unit removal
A
Ballast Board
FN903
Sub Power
Board
Drive Board
A
AA
B
B
Ballast Cover
1 Remove 2 screws A and 4 screws B(small) and pull the
Optical Unit upward off.
2 Remove 4 screws C to take the Fan (FN906) off.
3 Remove 1 screws D to take the Fan (FN904) off and 2
screws E to take the air duct off.
Fig.6
6 Optical Unit removal
FN906
FN904
Optical Unit
A
A
BB
BB
C
C
C
D
E
E

-11-
1 Remove 2 screws A to take the Prism Base ass’y
upward off.
2 Remove 2 screws B to take the Lens Shift Motor and
Sensor SW Holder from the Base.
Mechanical Disassemblies
1 Remove 3 screws A to take the Power Board off.
2 Remove 4 screws B to take Holder off from the cabinet
bottom.
Fig.8
Fig.7
7 Prism Base removal
8 Power Board removal
Prism Base Ass’y
Motor and
Sensor Holder
B
B
A
A
Power Board
Power Board
Holder
B
B
A
A
B
B
A

-12-
1 Remove 1 screw A to take Interlock Switch(SW905).
2 Remove 2 screws B to take Filter Board Holder and
remove 2 screws C to take Filter Board from the Holder.
3 Remove 1 screw D to take Thermal Switch(SW902).
Mechanical Disassemblies
1 Remove 4 screws A to take Air-duct Top off.
2 Remove 1 screw B (small) and 1 screw C (big) to take
Duct Cover-A.
3 Remove 2 screws D to take Fan (FN901) off.
4 Remove 2 screws E (small) and 2 screws F (big) to take
Air-duct-A and Fan (FN902) off.
Fig.10
10 Fans (FN901, FN902) removal
Fig.9
9 Line Filter Board & Interlock SW & Thermal
SW removal
D
Interlock Switch
(SW905)
Filter Board
C
C
A
B
B
Holder
Thermal Switch
(SW902)
A
A
A A
B
C
D
D
E
E
F
F
F
Duct
Cover
-A
FN901
FN902
Air-duct-A
Air-duct
Top
Duct
Cover-B

-13-
1 Remove Cabinet Front-Top following to the chapter “Mechanical
Disassemblies”.
2 Loosen 2 screws A with 2.5mm hex wrench.
3 Unhook 2 hooks B on the both side of the lens and remove the Projection
Lens ass’y off.
Fig.1
■ Optical Parts Disassemblies
Before taking this procedure, remove Cabinet Top and Main Board following to the “Mechanical Disassemblies”.
Disassembly requires a 2.0mm or 2.5mm hex wrench and a slot screwdriver.
Projection Lens removal
Fig.1-2
1 Remove each hex screw and pull the Polarized Glass-In ass’y upward.
2 Remove a stopper and take the glass off upward.
Polarized Glass-In removal
Fig.2-1
A
A
B
B
Optical Filter
Polarized Grass
1AV4Z15***
Part No.
Film side

-14-
Optical Pats Disassemblies
1 Remove 2 hex screws A and pull the Relay Lens ass’y upward.
2 Remove 2 screws B to take the Lens off from the holder.
Note:
There is no mounting direction of the lens.
A
Fig.3-2
Fig.3-1
B
B
Holder
Relay Lens
A
Relay Lens disassembly

-15-
Note:
Do not replace the LCD panel
separately otherwise it can
not obtain proper picture.
Fig.4-1Fig.4-2
1 Remove 4 hex screws A and take the LCD/Prism ass’y off upward.
2 Remove 3 screws B and take the Glass Holder, and then pull the
polarized Glass-Out and the optical filter-out(WV) upward off. These
glasses are mounted for R, G and B LCD panels respectively.
Note:
To avoid the CG and focus alignments slipping off, please be careful to
handle the LCD/Prism ass'y.
LCD Panel/Prism Ass’y
Polarized Glass-Out and Optical Filter-Out(WV) removal
A
A
A
BB
B
Polarized Glass-
Out
Optical Filter(WV)
Optical Filter(WV)
Optical Filter(WV)
Optical Filter(WV)
Polarized Glass
Polarized Glass
Polarized Glass
Polarized Glass
1AV4Z15B180
1AV4Z15B180
Film
R-PANEL
B-PANEL
G-PANEL
PRISMPRISM
Film side
Optical Filter-
Out(WV)
Fig.4-3
Optical Pats Disassemblies

-16-
Optical Parts Disassemblies
1 Remove 7 screws to take the Optical Unit Top off upward.
Optical Unit Top removal
1 Remove 2 hex screws A and take the Condenser Lens ass’y.
2 Release 4 hooks B to take the Lens off from the holder.
A
Fig.6-1
A
Condenser Lens disassembly
* Lens should be placed
as the flat surface side
comes to the holder
side.
Condenser Lens
Fig.5

-17-
When the optical parts in the optical unit mounting or assembling,
the parts must be mounted in the specified location and direction as
shown in figure below.
Optical Parts Disassemblies
14
12
8
Fig.7
3
14 1
24
9
13
6
1 Condenser lens (R)
2 Condenser lens
3 Condenser lens
4 Mirror (B)
5 Optical filter (UV cut)
6 Dichroic mirror (B
7 Dichroic mirror (G)
8 Mirror (W)
9 Condenser lens (IN)
10 PBS (prism beam splitter)
11 Integrator lens (OUT)
12 Integrator lens (IN)
13 Relay lens (IN)
14 Mirror (R)
7
10
11
5
The printed marker
comes this side. The printed marker
comes this side.
The cutting corner
comes to this side up.
Key No. Description
Locations and Directions

-18-
■ LCD Panel/Prism Ass’y Replacement
1 Remove the cabinet top and main board following to
“Mechanical Disassemblies”.
2 Remove 4 screws by using the 2.0 mm hex driver and
take the LCD Panel/Prism ass’y off upward from the
optical unit.
After replacing or installing the LCD Panel/Prism ass'y,
please make sure to obtain the best focus in both TELE
and WIDE zoom. If the focus adjustment is required,
please adjust the positioning of LCD Panel/Prism Ass’y by
following the below procedure.
Mounting Procedure:
1 Loosen 4 screws A on the LCD Panel/Prism ass'y with
2.0 mm hex driver.
2 Turn the projector on and project the image with WIDE
zoom, and adjust the FOCUS control to obtain the best
focus.
3 Turn the ZOOM control to the TELE position.
4 Move the LCD Panel/Prism Ass’y backward or forward
(about 0mm ~ 0.8mm) to obtain the proper focus.
Confirm the focus at TELE and WIDE zoom.
5 Tighten 4 screws A to fix the LCD Panel/Prism ass'y.
Top View A
A
A
A
LCD Panel/Prism Ass’y
Note:
Do not replace the LCD
panel separately otherwise
it can not obtain proper
picture.
IMPORTANT NOTICE on LCD Panel/Prism Ass'y Replacement
LCD panels used for this model can not be replaced separately. Do not disassemble the LCD Panel/Prism Ass’y.
These LCD panels are installed with precision at the factory. When replacing the LCD panel, should be replaced
whole of the LCD panels and prism ass’y at once.
After replacing LCD Panel/Prism ass’y, please check the following adjustments.
- Check the “Condenser Lens Adjustment” and “Relay Lens Adjustment” following to chapter “Optical
Adjustment”.
- Check the “White Balance Adjustment” and “Common Centre Adjustment” following to chapter “Electrical
Adjustment”.
- Check the white uniformity on the screen.
If you find the color shading, please adjust the white uniformity by using the proper computer and “Color
Shading Correction” software supplied separately. The software can be ordered as follows;
LCD Panel/Prism Ass’y removal
Note on LCD Panel/Prism Ass’y Mounting
COLOR SHADING CORRECTION SOFTWARE
Service Parts No. 645 051 2308

-19-
WARNING:
- For continued safety, replace with a lamp assembly of the same type.
- 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.
- Do not drop the lamp module or touch the glass bulb! The glass can
shatter and cause injury.
Procedure
1 Turn off the projector and disconnect the AC cord. Allow the projector to
cool for at least 45 minutes.
2 Loosen 2 screws with a screwdriver and open the lamp cover.
3 Loosen 2 screws and pull out the lamp assembly by grasping the
handle.
4 Replace the lamp assembly securely and tighten 2 screws.
5 Close the lamp cover and tighten 2 screws.
6 Connect the AC cord to the projector and turn on.
7 Reset the Lamp Replace Counter, see below explanation.
Note:
- Do not reset the Lamp Replace Counter, except after lamp is replaced.
- The projector can not be turned-on with lamp cover removed, because
when the lamp cover is removed, the interlock switch is also released to
switch off the mains power for safety.
■ Lamp Replacement
1 Turn the projector on, and press the MENU button
and the on-screen menu will appear. Press the
POINT LEFT/RIGHT buttons to move a red frame
pointer to SETTING menu icon.
2 Press the POINT DOWN button to move a red frame
pointer to “Lamp counter reset” and then press
the SELECT button. The message “Lamp replace
counter reset?” is displayed. Move the pointer to [Yes]
and the press the SELECT button.
3 Another confirmation dialog box appears and select
[Yes] to reset Lamp Replace Counter .
Please refer to the owners manual for further
information.
Recommendation
Should the air filter become clogged with dust particles,
it will reduce the cooling fan’s effectiveness and may
result in internal heat build up and short lamp life. We
recommend cleaning the air filter after the projection
lamp is replaced.
Refer to “Air Filter Cleaning”.
Lamp cover
ORDER REPLACEMENT LAMP
Type No. Service Parts No.
POA-LMP38 610 293 5868
How to reset Lamp Replace Counter
Screws
Handle
Lamp Assembly
The LAMP REPLACEMENT indicator will illuminate
when the Lamp Replace Counter reaches 1000 hours.
This is to indicate that lamp replacement is required.
You can check the lamp replace counter following to
below procedure.
1 Press and hold the pointer UP on the projector for
more than 20 seconds.
2 The Lamp replace Counter service menu appears
on the screen briefly. For example, when the value of
data indicates “123”, the accumulated operation time
is 123 hours.
Service Mode
Input 1
Group No. Data
40 0 123
Ver. 1.00 .00
Lamp replace counter data
How to check Lamp Replace Counter

-20-
■ Optical Adjustments
Before taking optical adjustments below, remove the Cabinet Top and Main Board following to the “Mechanical
Disassemblies”
Adjustments require a 2.0mm hex wrench and a slot screwdriver.
Note: Do not disconnect connectors K8L, K8X, K8D, K8G and K8E on the main board, because the projector can
not turn on due to operate the power failure protection.
Optical Filter(WV)
Optical Filter(WV)
Polarized Glass
Polarized Glass
Fig.1-1
Polarized glass
mounting base
A
Fig.1-2
B
Fig.1-3
C
[Before Adjustment]
- Input a 100% of black raster signal.
[R/G/B-CONTRAST ADJUSTMENT]
1 Loosen a screw A (Fig.1-1/1-4) on the polarized glass mounting base
which you intend to adjust.
2 Turn the polarized glass mounting base with knob B as shown in Fig.1-2
to obtain the darkest brightness on the screen. (The polarized glass and
optical filter move together.)
3 Turn the optical filter mounting base with know C as shown in Fig.1-3
to obtain the black color uniformity on the screen.(Move only the optical
filter.)
4 Tighten the screw A to fix the polarized glass mounting base.
Repeat steps 1 to 4 for remaining R, G or B contrast adjustment.
Contrast adjustment