Toshiba 50a60 sm schematic
FILE NO. 020-200012
SERVICE MANUAL
COLOR TELEVISION
N0NSP Chassis
50A60, 50A50
(TAC0050)
55A60
(TAC0052)
(TAC0051)
,
61A60
(TAC0053)
PUBLISHED IN JAPAN, May., 2000 S
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS........................................................................................................................................3
CRT ASSEMBLY REPLACEMENT AND MOUNTING .............................................................................................4
PICTURE TUBE COMPONENTS ADJUSTMENT.................................................................................................... 6
REPLACEMENT OF THE CRT.................................................................................................................................8
SERVICE MODE ......................................................................................................................................................9
ELECTRICAL ADJUSTMENT ................................................................................................................................11
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
CONVERGENCE ADJUSTMENT ..........................................................................................................................13
SCREEN AND MIRROR ALIGNMENTS ................................................................................................................15
CIRCUIT CHECKS .................................................................................................................................................16
CHAPTER 2 SPECIFIC INFORMATIONS
SETTING & ADJUSTING DATA ..............................................................................................................................17
LOCATION OF CONTROLS ...................................................................................................................................18
PROGRAMMING CHANNEL MEMORY................................................................................................................. 20
CIRCUIT BLOCK DIAGRAM ..................................................................................................................................21
TABLE OF CONTENTS
MECHANICAL DISASSEMBLY ..............................................................................................................................23
CHASSIS REPLACEMENT PARTS LIST ............................................................................................................... 25
PC BOARDS BOTTOM VIEW.................................................................................................................................41
TERMINAL VIEW OF TRANSISTORS ...................................................................................................................51
SPECIFICA TIONS .................................................................................................................................................. 53
APPENDIX:
CIRCUIT DIAGRAM
– 2 –
CHAPTER 1 GENERAL ADJUSTMENTS
SAFETY INSTRUCTIONS
WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU-
TION” AND “PRODUCT SAFETY NOTICE” INSTRUCTIONS BELOW.
X-RAY RADIATION PRECAUTION
1. Excessive high voltage can produce potentially hazardous
X-RAY RADIATION. To avoid such hazards, the high voltage must not be above the specified limit. The nominal
value of the high voltage of this receiver is (A) kV at zero
beam current (minimum brightness) under a 120V AC
power source. The high voltage must not, under any circumstances, exceed (B) kV.
Refer to table-1 for high voltage (A), (B).
(See SETTING & ADJUSTING DATA on page 17)
Each time a receiver requires servicing, the high voltage
should be checked f ollowing the HIGH VOLT AGE CHECK
procedure in this manual. It is recommended that the reading of the high voltage be recorded as a part of the service
record. It is important to use an accurate and reliable high
voltage meter.
SAFETY PRECAUTION
WARNING : Service should not be attempted by any one unf amiliar with the necessary precautions on this receiver. The following are the necessary precautions to be observed before
servicing this chassis.
1. An isolation Transformer should be connected in the power
line between the receiver and the AC line bef ore any service is performed on the receiver.
2. Always discharge the picture tube anode to the CRT conductive coating before handling the picture tube . The picture tube is highly evacuated and if broken, glass fr agments
will be violently expelled. Use shatter proof goggles and
keep picture tube away from the unprotected body while
handling.
3. When replacing a chassis in the cabinet, always be certain that all the protective devices are put back in place,
such as; non-metallic control knobs, insulating covers,
shields, isolation resistor-capacitor network etc.
4. Before returning the set to the customer, always perform
an AC leakage current check on the exposed metallic parts
of the cabinet, such as antennas, terminals, screwheads,
metal overlays, control shafts etc. to be sure the set is saf e
to operate without danger of electrical shock. Plug the A C
line cord directly into a 120V AC outlet (do not use a line
isolation transformer during this check). Use an AC voltmeter having 5000 ohms per volt or more sensitivity in the
following manner:
PRODUCT SAFETY NOTICE
2. This receiver is equipped with a F ail Safe (FS) circuit which
prevents the receiver from producing an excessively high
voltage ev en if the B+ voltage increases abnormally. Each
time the receiver is serviced, the FS circuit must be checked
to determine that the circuit is properly functioning, following the FS CIRCUIT CHECK procedure in this manual.
3. The only source of X-RAY RADIA TION in this TV receiver
is the picture tube. F or contin ued X-RAY RADIATION protection, the replacement tube must be exactly the same
type tube as specified in the parts list.
4. Some part in this receiver have special safety-related characteristics for X-RAY RADIATION protection. For continued safety, parts replacement should be undertaken only
after referring to the PRODUCT SAFETY NO TICE below.
Connect a 1500 ohm 10 watt resistor , paralleled b y a 0.15
µF, AC type capacitor, between a known good earth ground
(water pipe, conduit, etc.) and the exposed metallic parts,
one at a time. Measure the AC voltage across the combination of 1500 ohm resistor and 0.15 µF capacitor. Reverse the AC plug at the AC outlet and repeat AC voltage
measurements for each exposed metallic part. Voltage
measured must not exceed 0.3 volts rms. This corresponds
to 0.2 milliamp. AC. Any value exceeding this limit constitutes a potential shock hazard and must be corrected immediately.
AC VOLTMETER
0.15µF
Place this probe on
Good earth ground
such as a water
pipe, conduit, etc.
1500 ohm
10 watt
each exposed
metallic part.
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
Many electrical and mechanical parts in this chassis have special safety-related characteristics. These characteristics are
often passed unnoticed by a visual inspection and the protection afforded by them cannot necessarily be obtained b y using
replacement components rated for higher voltage, w attage, etc. Replacement parts which have these special saf ety characteristics are identified in this manual and its supplements; electrical components having such features are identified by the
international hazard symbols on the schematic diagram and the parts list.
Before replacing any of these components, read the parts list in this manual carefully. The use of substitute replacement
parts which do not have the same safety characteristics as specified in the parts list may create shock, fire, X-ray radiation or other hazards.
– 3 –
CRT ASSEMBLY REPLACEMENT AND MOUNTING
CAUTION : DO NOT LOOSEN THE HEX HEAD BOLTS WITH SPRINGS (12 PCS), BECAUSE THOSE ARE FOR
SEALING OF CRT COOLANT.
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
8 o’clock
4 o’clock
Lens Assembly
R
GB
Attention Serviceman
The Hex Head
Bolts with
Springs. (see
sketch) used on
CRT assembly,
are “NOT”
Adjustment Screws
DO NOT LOOSEN-FLUID
LEAKAGE WILL OCCUR.
4 Screws
4 Screws
CRT Assembly
CRT Anode Cap Assembly
S.V.M. Coil
CRT DRIVE Board
CRT Mounting
Deflection Yoke and Conver Yoke
Lens and Neck Components View
– 4 –
TO REMOVE CRT (Same procedure for R, G, B)
1. Remove CRT DRIVE Board, S. V. M. COIL and
DEF. YOKE from CRT.
2. Remove Lens Assembly.
3. Detach CRT Anode Cap from CRT.
4. Remove CRT Assembly from CRT Mounting.
CRT REPLACEMENT (Same procedure for R, G, B)
Reverse the removal procedures except the followings.
1. Anode Cable should be replaced with new one.
See “SERVICING PRECAUTIONS” shown below.
2. Install silicon (T461B) to the CRT, replace the Anode
cable and put enough silicon again on around the Anode Cap as illustrated.
CAUTION: Align the Anode cable as illustrated on page
4.
ADJUSTING PROCEDURE IN REPLACING CRT
1. R.G.B. FOCUS ADJUSTMENT (page 6.)
2. PICTURE TILT ADJUSTMENT (page 6.)
3. USER CONVERGENCE CENTER CHECK
(See owner's manual.)
4. CENTERING ADJUSTMENT (page 6.)
5. CONVERGENCE ADJUSTMENT (page 13.)
6. WHITE BALANCE ADJUSTMENT (page 12.)
Adjustments are complete.
Anode Cap
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
Silicon
(On shaded area)
TSE3843W #23960136
SERVICING PRECAUTIONS
■ Do not use a magnetized screw driver for screws
of Deflection Yoke and Velocity Modulation Coil to
avoid magnetization of electron gun.
Magnetization of electron gun will degrade basic
function and result in unbalance of right and left
shift of user static convergence, and result in no
variable quantity.
2 ~ 5 mm
15 ~ 25 mm
■ When replacing the anode cap assembly (CRT) or
anode lead assembly (F.B.T.), remove the anode
lead holder from old one and attach the holder
again to new anode lead.
■ Check the point of anode lead in a straight
line, if it is winding, please revise it.
Screw for
D.Y
Screw for SVM coil
Anode lead holder
– 5 –
WARNING : BEFORE SERVICING THIS CHASSIS , READ THE “X-RAY RADIA TION PRECA UTION”, “SAFETY PRECAUTION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL.
DESCRIPTION OF NECK COMPONENTS TILT ADJUSTMENT
2
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
1 Deflection yoke and convergence yoke
The position on the neck is required most front
(CRT funnel side) and the screw is fastened after
rotating yoke adjusting picture tilt.
2 Centering magnet
After adjusting picture tilt, picture position is finally
fixed by this magnet.
In order to get maximum margin of user convergence control for center of screen, this magnet
have to be used for center convergence adjustment.
PICTURE TUBE COMPONENTS ADJUSTMENT
1
Rotate R, G, B deflection yoke so that picture becomes
horizon, then fasten screw.
CENTERING ADJUSTMENT
1. Stretch a thread between two center slots of screen
edge (top and bottom, left and right).
2. Select the adjustment mode.
3. Press TV/VIDEO button on the Remote Control to display the white cross-bar.
PREPARATION
Operate the receiver for at least 5 minutes.
R, G, B FOCUS ADJUSTMENT
1. Before adjusting the R, G, B FOCUS, remove the 4
screws of Lens Assembly which is fixed on the CRT
Assembly. (See page 4.)
Then turn around the Lens Assembly by 180˚ to adjust
the fastening screw (Fig. a) and f asten the 4 scre ws to
secure Lens Assembly.
2. Select the adjustment mode. (See page 9.)
3. Press “7” button to display the built-in cross-hatch.
4. Press “0” and “R TN” buttons to mak e the picture a single Red color.
100 button ............... to erase Red color
0 button ............... to erase Green color
RTN button ............... to erase Blue color
5. Loosen the fasten screw and adjust Red lense focus
to best focusing point of picture center. Then fasten
the screw. (See Fig. a.)
4. Perform VCEN adjustment. (See page 11.)
5. Adjust G centering magnet so that the cross-bar pattern center comes to screen center.
6. Perform HEIGHT adjustment . (See page 12.)
7. Perform VERT. LINEARITY adjustment.
8. Perform WIDTH adjustment. (See page 12.)
9. Check whole quality of green line.
10
. Adjust R, B centering magnet so that the cross-bar pat-
tern center comes to screen center.
Fig. a
6. Adjust FOCUS VR “R” of FOCUS PACK to find best
focusing point of picture center.
7. Repeat steps 3 to 5 for Green and Blue colors.
– 6 –
LOCATION OF SCREEN AND FOCUS VR’S
RGB
SCREEN VR
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
FOCUS VR
– 7 –
Service parts are provided for each R, G and B.
The contents of the parts are as follows.
HITACHI
CRT
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
REPLACEMENT OF THE CRT
RGB
50A50 23796001 23005397 23796003
50A60 23005114 23005115 ↑
55A60 23005242 ↑↑
61A60 23005249 ↑ 23796486
REPLACEMENT OF HIGH VOLTAGE CABLE
ANODE LEAD
RUBBER BOOT
LEAD HOLDER
Fig. a
Z450 TP A5007
1. When replacing Anode Lead or Anode Cap with new
one, remove Lead Holder from old lead as shown in
figure below, and put it on ne w lead. Do not throw awa y
Lead Holder.
NOTE : THE LEAD HOLDER IS ATTACHED TO
TP A5007 (Z450), BUT IS NO T A TTACHED T O
ANODE LEAD AND ANODE CAP. RUBBER
BOOT IS ATTA CHED TO ANODE LEAD AND
ANODE CAP.
2. Detaching Lead Holder
RUBBER BOOT
LOCK LEAD HOLDER
Fig. b
Cut here rubber boot
and lead together to
detach Lead Holder.
OLD
ANODE LEAD
or
ANODE CAP
– 8 –
1. ENTERING TO SERVICE MODE
1) Press MUTE button once
on Remote Control.
MUTE
SERVICE MODE
2) Press MUTE button
again to keep pressing.
3) While pressing the MUTE button,
press MENU button on TV set.
S
(Service mode display)
2. DISPLAYING THE ADJUSTMENT MENU
1) Press MENU button on TV.
Service mode
S
Press
Press
Adjustment mode
3. KEY FUNCTION IN THE SERVICE MODE
The following key entry during display of adjustment menu provides special functions.
Screen adjustment mode ON/OFF: TV (ANT)/VIDEO button (on TV)
Selection of the adjustment items : Channel s/t (on TV or Remote)
Change of the data value : Volume s/t (on TV or Remote)
Adjustment menu mode ON/OFF : MENU button (on TV)
Initialization of the memory (QA02) : RECALL+Channel button on TV (s)
Initialization of the self diagnostic data: RECALL+Channel button on TV (t)
“RCUT” selection : 1 button
“GCUT” selection : 2 button
“BCUT” selection : 3 button
“SCNT” selection : 4 button
“SCOL” selection : 5 button
“TNTC” selection : 6 button
Convergence adj : 7 button
Test audio signal ON/OFF (1kHz) : 8 button
Self diagnostic display : 9 button
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
Item
Data
– 9 –
4. SELECTING THE ADJUSTING ITEMS
1) Every pressing of CHANNEL s button in the service mode changes the adjustment items in the order of table-2.
(t button for reverse order)
Refer to table-2 for preset data of adjustment mode.
(See SETTING & ADJUSTING DATA on page 17)
5. ADJUSTING THE DATA
1) Pressing of VOLUME s or t button will cahnge the value of data in the range from 00H to FFH. The variable range
depends on the adjusting item.
6. EXIT FROM SERVICE MODE
1) Pressing POWER button to turn off the TV once.
■ INITIALIZATION OF MEMORY DATA OF QA02
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
After replacing QA02, the following initialization is required.
1. Enter the service mode, then select any register item.
2. Press and hold the RECALL button on the Remote, then press the CHANNEL s button on the TV . The initialization of QA02
has been complated.
3. Check the picture carefully. If necessary, adjust any adjustment item above.
Perform “Programming Channel Memory” on the owner's manual.
CAUTION: Never attempt to initialize the data unless QA02 has been replaced.
7. SELF DIAGNOSTIC FUNCTION
1) Press “9” button on Remote Control during display of adjustment menu in the service mode.
The diagnosis will begin to check if interface among IC’s are executed properly.
2) During diagnosis, the following displays are shown.
SELF CHECK
1
2
3
4
5
1 Part number of microprocessor (QA01)
2 Operation number of protection circuit (current limiter) . . . . “000” is normal.
3 BUS line check “OK” ................... Normal
4 BUS line ACK (acknowledge) check
5 Sync. signal check Green display..... Normal
NO. 23XXXXXX
POWER : 000
BUS LINE : OK
BUS CONT : OK
BLOCK : MAIN SUB
“SCL-GND” or “NG” ........... SCL-GND short circuit
“SDA-GND” or “NG” ........... SDA-GND short circuit
“SCL-SDA” or “NG” ............ SCL-SDA short circuit
“OK” ..................... Normal
Display of Location Number . . . . NG
(Display example)
“QA02 NG”, “H001 NG”, “Q501 NG” etc.
Note: The indication of failure place is only one place though failure places are plural. When
repair of a failure place finishes, the next failure place is indicated. (The order of priority of
indication is left side.)
Red display ........ NG
MAIN ........ Main sync
SUB .......... Sub sync (when turn on the PIP)
– 10 –
ELECTRICAL ADJUSTMENT
ITEM ADJUSTMENT PROCEDURE
VERTICAL POSITION (VCEN)
SUB-BRIGHTNESS
(BRTC)
SUB-COLOR
(SCOL)
SUB-TINT
(TNTC)
1. Call up the adjustment mode display, then select item VCEN.
2. Press the VOLUME s or t button to get the voltage +30 ±10 mV.
3. Measuring method of voltage as follows.
TP-V
(on SIGNAL board)
TP-G C
(on SIGNAL board)
DIGITAL
VOLT METER
1. Constrict the picture height until the
vertical retrace line appears adjusting
the HEIGHT control on the MAIN board.
2. Adjust the CONTRAST to the minimum
and BRIGHTNESS to the center.
3. Enter the service mode, then select
“BRTC” register.
4. Adjust the data value so the belt of
vertical retrace line just disappear.
5. Adjust the HEIGHT control.
* Adjust the SUB-BRIGHTENESS after
adjusting the WHITE BALANCE.
Vertical retrace line
1. Receive color-bar signal from color-bar generator.
2. Adjust the BRIGHTNESS and CONTRAST to the center (RESET status).
3. Connect oscilloscope to TP501on the MAIN board.
4. Enter the service mode, then select “SCOL”.
5. Temporarily adjust the data value to
achieve about 1V0-p of blue bar.
6. Select “TNTC” register.
Magenta
Blue
7. Adjust the data value to obtain the blue
bar to magenta bar ratio of 3:2 as
shown.
0
2
8. Select “SCOL” register .
9. Adjust the data value to achieve 1.8V
of blue bar on scope.
0-p
10. Check the picture with off-air signal.
3 (1.8V
0-P
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
)
SUB-CONTRAST
(SCNT)
1. Tune in a color program and adjust the BRIGHTNESS and CONTRAST to
normal mode(RESET).
2. Enter the service mode, then select "SCNT" register.
3. Change "SCNT" data to13H.
4. Check the picture contrast.
PICTURE POSITION 1. Receive the pattern signal which shows it's center
on the screen.
2. Adjust the picture position alternately by turning
CENTERING MAGNETS for proper picture position.
3. Check the picture with off-air signal.
– 11 –
ITEM ADJUSTMENT PROCEDURE
HEIGHT
(HIT)
WIDTH
(WID)
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
VERTICAL LINEARITY
(VLIN)
WHITE BALANCE
(RCUT)
(GCUT)
(BCUT)
(RDRV)
(BDRV)
1. Call up the adjustment mode display, then select the item HIT.
2. Press the VOLUME s or t button to get the picture so the top of raster begins
to lack.
3. Press the VOLUME s button to advance the data by 10 steps.
Note : Check the vertical picture position is correct.
1. Call up the adjustment mode display, then select the item WID.
2. Press the VOLUME s or t button to get the picture so the left and right edges
of raster begins to lack.
3. Press the VOLUME s or t button to advance the data by 10 steps.
Note : Check the horizontal picture position is correct.
1. Call up the adjustment mode display, then select the item VLIN.
2. Receive cross-hatch pattern signal.
3. Press the VOLUME s or t
button to obtain the picture of
the best linearity.
4. Then readjust the item HIT.
Center
1. Press RESET button on TV or remote hand set.
2. Call up the adjustment mode display, then adjust the data of items RCUT, GCUT
and BCUT to “40”.
3. Press TV (ANT)/VIDEO button on TV.
4. Gradually rotate R, G and B SCREEN volume of FOCUS PAC (page 7) clockwise or counterclockwise until the raster appears slightly on the CRT through
the each lens, and leave them.
(Look into the lens in order to check the raster.)
5. Press TV (ANT)/VIDEO button on TV again.
6. Exit from service mode.
7. Receive white laster pattern signal, and adjust the contrast to the minimum to
make white picture to low light.
8. Adjust the data of items RCUT, GCUT and BCUT for low light area.
9. Adjust the contrast to the maximum to make white picture to high light.
10. Adjust the data of items GDRV and BDRV Controls for proper white-balanced
picture in high light area.
11. Check the white balance in both low and high light areas. If necessary, perform
again steps from 7 to 9.
The data of item GDRV changes red drive actually.
*
– 12 –
CONVERGENCE ADJUSTMENT
Adjust convergence from center to circumference in order.
1. Select the adjustment mode following the steps on page 9.
KEY FUNCTION IN THE
CONVERGENCE ADJUSTMENT:
RCUT
40H
Up : 2 button
Selet Green color: 3 button
Left : 4 button
Blinking of cursor ON/OFF: 5 button
Right: 6 button
Adjust mode ON/OFF: 7 button
Down: 8 button
Erase Green line: 0 button
Erase Red line: 100 button
Erase Blue line: CHRTN (ENT) button
Note:
Adjusting procedure in replacing convergence board.
1. User convergence center check. Make
sure the best convergence setting is
about the center of adjustable range.
2. CENTERING ADJUSTMENT
3. PICTURE POSITION ADJUSTMENT
4. HIT, WID ADJUSTMENT
5. CONVERGENCE ADJUSTMENT
2. Press “7” button to display the built-in cross-hatch pattern.
27.5
Cursor
P = 50.5 x14 (50")
55.8 x14 (55")
62 x14 (61")
27.5
44
P = 84 x12 (50")
92 x12 (55")
103 x12 (61")
The pattern includes three colors (R, G, B).
The cursor should be blinking in Red.
This means that the Red color is adjustable.
Adjustment around cursor can be done.
3. Press “3” button to select Green color to be adjusted.
4. Press “5” button to stop the blinking of cursor.
5. Press “2 (up)”, “8 (down)”, “4 (left)” or “6 (right)” to obtain the correct
cross-hatch pattern as above.
If necessary, the specified color line can be erased from the screen.
100 button .................. to erase Red line
0 button .................. to erase Green line
RTN (ENT) button .................. to erase Blue line
6. Press “5” button to make the cursor blinking.
7. Press “2”, “8”, “4”, “6” buttons to move the cursor to other point to be
adjusted.
8. Repeat steps 4 to 7.
9. Repeat steps 3 to 8 to adjust Red and Blue colors.
Converge the selected color line into the Green line.
10. Press “7” button to enter the adjusted states.
At this time, picture changes for about 1 second.
11. Press “7” button again to return to the normal picture.
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
– 13 –
NOTES
In many cases, color misconv ergence may be corrected by returning HIT and WID data in main deflection side to initial adjusting
values. Following cases will surely require readjustment of convergence.
CRT REPLACEMENT
When CRT is replaced, main deflection readjustment and color matching are required.
Perform following procedures.
1. Replace two CRT’s of blue and red.
2. Perf orm horizontal adjustment for blue and red yokes on base of green CRT data. Mount yoke and velocity mod. coil alignment, pushing towards CRT without gap.
3. Adjust alignment of blue and red. (Refer Alignment adjustment for details.)
4. Rotating centering magnet, adjust CRT centers of red and blue to CRT center of green.
(Picture position adjustment)
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
5. Adjust HIT and WID data of main deflection, and decide data at the most precise screen comparing to green data.
6. Adjust convergence of each screen picture for color matching. Do not move green one at this time.
7. After convergence adjustment of each screen picture finishes, replace green CRT.
For green CRT as well, repeat steps 2 to 5 above on bases of red and blue color matching to adjust convergence.
REPLACING CONVERGENCE UNIT
When replacing convergence unit, all picture screens require readjustment basically, but the following method allo ws process be
reduced considerably.
1. Replace the memory (Q713) on defective unit with memory on new unit. Mounting the unit on the SET after the above
working realizes picture screen before replacement immediately.
2. Mount unit which has combination of old and new memories, on SET and turn it on. Screen shows whole picture looks like
straightly shifted towards vertical or horizontal direction.
3. Adjust again centers of green, red and blue with centering magnets.
4. Check each picture screen for slight disparity of color and picture size. If necessary, add some adjustments of main deflection and color matching of convergence.
– 14 –
SCREEN AND MIRROR ALIGNMENTS
ASSEMBLING OF
FRONT SCREEN
FRONT
Protect shield
FRONT
Label with part
number
(for 50”)
Lenticular sheet
MOUNTING OF
FRONT SCREEN
5 screws
Fresnel sheet
GENERAL ADJUSTMENTSSPECIFIC INFORMATIONS
3 screws
Protect shield
3 screws
3 screws
Fresnel sheet
Stick cotton
cloth tape
Label with part
number
(for 55”, 61”)
Lenticular sheet
Protect shield
FRONT
Label with part
number
Stick contton
cloth tape
Fresnel sheet
Label with part
number
CAUTION : Do not hold the optical system parts (lens and
mirror) with bare hand to avoid finger-prints on
the surface of those parts.
HOW TO CLEAN LENS AND MIRROR
1. Be sure to remove sand dust with an air brush, etc.
2. When it is stained slightly , breathe upon it and wipe awa y
with the specified cleaning cloth.
For other stains than the above, wipe the stains away
with the specified cloth into which a cleaning liquid has
been soaked.
Cleaning liquid.................... LENS LUSTER (Manufac-
tured by Edmund Scientific
Co.), etc.
4 screws
Please refer to Mechanical Disassembly on page 23.
*
HOW TO CLEAN SCREEN
When cleaning the screen, use a soft cloth so as not to
damage the screen.
1. Wipe the screen with a dry cloth to remove moisture on
the screen.
Note : Absolutely do not use detergent, water, alcohol,
benzine, thinner, etc. for cleaning in order not to
wipe away the black print on the surface.
– 15 –
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