Sampo SME-23DL3 User manual

REV: 1
34“ MULTIMEDIA MONITOR
SERVICE MANUAL
MODEL SME-23DL3 SERIES
MMM-0002
VER. 1.0

If having any changes do not do advanced advice.
CONTENTS
1. IMPORTANT SAFETY PRECAUTIONS ….. 1-1
2. SPECIFICATION ......................................... 2-1
3. LOCATION OF USER’S CONTROL …….…3-1
4. DISASSEMBLY AND REASSEMBLY …….. 4-1
5. FACTORY & ELECTRONIC ADJUSTMENT 5-1
6. BLOCK DIAGRAM ....................................... 6-1
7. TROUBLE S OOTING GUIDES ................. 7-1
8. SC EMATIC DIAGRAM ............................. 8-1
9. DEFECT BAR CODE LIST ........….............. 9-1
10.REPLACEMENT PARTS LIST ………...…10-1
11.PACKING OF T E SET …....................... 11-1

IMPORTANT SAFETY PRECAUTIONS VER 1.0
- 1-1 -
1. Before returning an instrument to the
customer always make a safety check of the
entire instrument, including, but not limited to,
the following items.
a. Be sure that no built-in protective devices are
defective and/or have been defeated during
servicing. (1) Protective shields are provided on
this chassis to protect both the technician and
the customer. Correctly replace all missing
protective shields, including any removed for
servicing convenience. (2) When reinstalling the
chassis and/or other assembly in the cabinet,
be sure to put back in place all protective
devices, including, but not limited to,
nonmetallic control knobs, insulating fishpapers,
adjustment and compartment covers/shields,
and isolation resistor/capacitor networks. Do
not operate this instrument or permit it to be
operated without all protective devices
correctly installed and functioning.
b. Be sure that there are no cabinet openings
through which an adult or child might be able
to insert their fingers and contact a hazardous
voltage, Such opening include, but are not
limited to, (1) spacing between the picture
tube and the cabinet mask, (2) excessively
wide cabinet ventilation slots, and (3) an
improperly fitted and/or incorrectly secured
cabinet back cover.
c. Leakage Current Hot Check «
««
«With the
instrument completely reassembled, plug the
AC line cord directly into a 120V AC outlet. (Do
not use an isolation transformer during this test.)
Use a leakage current tester or a metering
system that complies with American National
Standards Institutes (ANSI) C101.1 Leakage
Current for Appliances and Underwriters
Laboratories (UL) 478. With the instrument AC
switch first in the ON position and then in the
OFF position, measure from a known earth
ground (metal waterpipe, conduit, etc.) to all
exposed metal parts of the instrument
(antennas, handle bracket, metal cabinet,
screwheads, metallic overlays, control shafts,
etc.), especially any exposed metal parts that
offer an electrical return path to the chassis.
Any current measured must not exceed 3.5
milliamp. Reverse the instrument power cord
plug in the outlet and repeat test. ANY
MEASUREMENTS NOT WITHIN THE LIMITS
SPECIFIED HEREIN INDICATE A POTENTIAL
SHOCK HAZARD THAT MUST BE
ELIMINATED BEFORE RETURNING THE
INSTRUMENT TO THE CUSTOMER.
2. Read and comply with all caution and
safety-related notes on or inside the Monitor
cabinet, on the Projection Monitor chassis, or
on the picture tube.
3. Design Alteration Warning «
««
«Do not alter or
add to the mechanical or electrical design of
this unit. Design alterations and additions,
including, but not limited to, circuit
modifications and the addition of the items such
as auxiliary audio and/or video output
connections might alter the safety
characteristics of this Projection Monitor and
create a hazard to the user. Any design
alterations or additions will void the
manufacturer’s warranty and will make you, the
service, responsible for personal injury or
property damage resulting therefrom.
4. Hot Chassis Warning «
««
«a. Some Monitor
chassis are electrically connected directly to
one conductor of the AC power cord and may
be safely serviced without an isolation
transformer only if the AC power plug is
inserted so that the chassis is connected to the
ground side of the AC power source. To
confirm that the AC power plug is inserted
correctly, with an AC voltmeter measure
between the chassis and a known earth ground.
If a voltage reading in excess of 1.0V is
obtained, remove and reinsert the AC power
plug in opposite polarity and again measure the
voltage potential between the chassis and a
DEVICE
UNDER
TEST
ALSO TEST WIT
PLUG REVERSED
(USING AC ADAPTER
PLUG AS REQUIRED)
TEST ALL
EXPOSED METAL
SURFACES
LEAKAGE
CURRENT
TESTER
+ -
EART
GROUND
3. WIRE CORD
AC Leaka
g
e Test (READING
S OULD NOR
BE ABOVE
3.5mA)

IMPORTANT SAFETY PRECAUTIONS VER 1.0
- 1-2 -
known earth ground. b. Some Monitor chassis
normally have 85V AC (RMS.), between
chassis and earth ground regardless of the AC
plug polarity. These chassis can be safely
serviced only with an isolation transformer
inserted in the power line between the receiver
and the AC power source, for both personnel
and test equipment protection. c. Some
Projection Monitor chassis have a secondary
ground systems in addition to the main chassis
ground. This secondary ground system is not
isolated from the AC power line. The two
ground system are electrically separated by
insulating material that must not be defeated or
altered.
5. Observe original lead dress. Take extra care
to assure correct lead dress in the following
areas: a. near sharp edges, b. near thermally
hot parts « be sure that leads and components
do not touch thermally hot parts, c. the AC
supply, d. high voltage, e. antenna wiring.
Always inspect in all areas for pinched,
out-of-place, or frayed wiring. Do not change
spacing between components, and between
components and the printed-circuit board.
Check AC power cord for damage.
6. Components, parts, and/or wiring that appear
to have overheated or are otherwise damaged
should be replaced with components, parts, or
wireing that meet original specifications.
Additionally, determine the cause of
overheating and/or damage and, if necessary,
take corrective action to remove any potential
safety hazard.
7. PRODUCT SAFETY NOTICE «
««
«Many Monitor
electrical and mechanical parts have special
safety-related characteristics some of which are
often not evident from visual inspection, nor
can the protection they give necessarily be
obtained by replacing them with components
rated for higher voltage, wattage, etc. Parts that
have special safety characteristics are
identified in this service data by shading with a
mark on schematics and by shading or a
mark in the parts list. Use of a substitute
replacement part that does not have the same
safety characteristics as the recommended
replacement part in this service data parts list
might create shock, fire, and/or other hazards.

SPECIFICATION VER 1.0
- 2- 1-
1. SCOPE
These specifications describe all the characteristics of the 32 inch color monitor.
2. ELECTRICAL REQUIREMENTS
2.1. Cathode ray tube
a. Tube size 32 inch
b. Dot pitch H = 0.8 mm
c. Light transmission 35.5% typical
d. CRT TYPE NAME TOSHIBA (M81AHM50X01)
2.2. Power
a. Input voltage 100 ~ 240 Vac 50 / 60 Hz
b. Input current 2.5 A at 110 Vac / 60 Hz
c. Inrush current 50 A
d. Power consumption 220 Watts
e. Line regulation 95 to 145 Vac / 60 Hz ~ 190 to 255 Vac / 50Hz
f. Stand-by less than 10 watts
2.3. Input signal
2.3.1 Video signal
a. Type Analog
b. Polarity Positive
c. Amplitude 0.714 VP-P
d. Input impedance 75 ohms
e. Dot rate 50M Hz (Max.)
2.3.2 Horizontal sync
a. Type TTL
b. Polarity Positive or Negative
c. Input impedance 1K ohms
d. Frequency RGB:31 KHz to 48 KHz
AV :15.734 KHz (NTSC) / 60 Hz
15.625 KHz (PAL) / 50 Hz
2.3.3 Vertical sync
a. Type TTL
b. Polarity Positive or negative
c. Input impedance 1K ohm (Min.)
d. Frequency 50 Hz to 90 Hz
2.3.4 Connector type 15 pin D-SUB and RCA JACK and S-terminal
2.3.5 Pin assignments for D-SUB connector
Pin 1 : RED Pin 6 : RED GND Pin 11 : GND
Pin 2 : GREEN Pin 7 : GREEN GND Pin 12 : SDA
Pin 3 : BLUE Pin 8 : BLUE GND Pin 13 : H-SYNC
Pin 4 : GND Pin 9 : NC Pin 14 : V-SYNC
Pin 5 : GND Pin 10 : GND Pin 15 : SCL

SPECIFICATION VER 1.0
- 2- 2-
2.3.6 Preset timing chart
ltem Description :
A Total time
B Active display area including borders
C Active display area excluding borders
D Left / Top border
E Right / bottom border
F Blanking time
G Front porch
H Sync width
I Back porch
The table below is required timings and technical description for the 32“ tube.
(H = 620 mm V = 465 mm standard size)
Mode No. 1 2 3 4 5 6 7 8 9
Resolution
&
Refresh Rate
640
480
60
640
480
72
720
400
70
640
480
66.6
800
600
60.317
800
600
56.25
640
480
85
800
600
72
1024
60
60
Hz
Pixel timing +/- .5% 39.722 31.746 35.311 33.06 25 27.8 36 50 15.385 n Sec
Horizontal visible 640 640 720 640 800 800 640 800 1024 Dots
Horizontal total 800 832 900 864 1056 1024 832 1040 1344 Dots
Horizontal front porch 16 16 18 64 40 24 56 56 40 Dots
Horizontal sync 96 40 108 64 128 72 56 120 145 Dots
Horizontal back porch 48 136 54 96 88 128 80 64 105 Dots
Hor blanking time 160 192 180 224 256 224 192 240 290 Dots
Vertical visible 480 480 400 480 600 600 480 601 768 Lines
Vertical total 525 520 449 525 628 625 509 667 806 Lines
Vertical front porch 10 1 12 3 1 1 1 1 1 Lines
Vertical sync 2 3 2 3 4 2 3 6 6 Lines
Vertical back porch 33 36 35 39 23 22 22 23 29 Lines
Vertical blanking time 45 40 49 45 28 25 26 30 36 Lines
Horizontal frequency 31.469 37.861 31.467 35 37.879 35.156 43.27 48.09 48.363 KHz
Vertical frequency 59.940 72.809 70.082 66.667 60.317 56.250 85 72 60 Hz
Vertical sync polarity - - + - + + - + - TTL
Hor sync polarity - - - + + + - + - TTL
Dot rate 25.2 31.2 28.3 30.204 40 35.97 36 50 65 MHz
G I
H
F
D E C
B
A
(Video)
(Sync)

SPECIFICATION VER 1.0
- 2- 3-
2.4. Display performance requirements.
The data of display performance are measured based on the following conditions unless
otherwise specified.
a. Ambient temperature 25 †
††
†5 degree C
b. Earth magnetic field : H : 0.00 V : 0.4 †
††
†0.05 Gauss
c. Warm up period 30 minutes minimum
d. Line input voltage : Nominal 120 Vac / 60 Hz ~ 220 Vac / 50 Hz
e. Unit facing direction With CRT screen facing east
f. Viewing distance Distance from screen is 81 cm
g. Display mode Test with full white pattern of mode 1 if not specified.
h. Brightness condition Press reloads button to set Brightness to center point and
adjust contrast control to 15 FL.
i. Heater voltage 6.0 †
††
†
0.3Vdc
j. HV Operation 31 †
††
†1KV
2.4.1 Maximum Resolution 1024 dots x 768 lines (non-interlace)
2.4.2 Horizontal size (Standard) 620 †
††
†8 mm (for mode 1 9)
Vertical size (Standard) 465 †
††
†8 mm (for mode 1 9)
2.4.2.1 Horizontal size (max) Mode 1-6 Over-scan
Vertical size (max) Mode 7-9 full-scan
2.4.3 Size thermal drift Within †
††
†
8 mm
(The size drift is being compared between the range of
operating and ambient temperature.)
2.4.4 Size regulation 1. Less than 7 mm (MODE 1 (
((
(
MODE 6)
(The size regulation is being compared the size change
between the max. and min. brightness level.)
2. Less than 7 mm (MODE 7 (
((
(
MODE 9)
(The size regulation is being compared the size change
between the recall. and min. brightness level.)
2.4.5 Maximum brightness level
a. Full white pattern 21 +5 -2 FL at the screen center.
(While pressing reload button to set contrast and brightness
control at max.)
b. 100% center block white
pattern
More than 68 FL.
(While pressing reload button to set contrast and brightness
control at max.)
c. Minimum brightness level
(ALL WHITE PATTERN)
With the contrast at min and brightness at central. Less than
5 FL.
d. Raster background 0.5 FL †
††
†0.3 FL.
(With the contrast max brightness at max and black signal)
2.4.6 Brightness uniformity
(Test with five circle mosaic
pattern and set the brightness
level of center circle at 15FL.)
Brightness (corner circle)
Brightness (center) >50%

SPECIFICATION VER 1.0
- 2- 4-
2.4.7 Linearity
(Test with cross-hatch pattern.
H: 17 Line V: 13 Line)
2.4.8 Distortions requirement
a. Total Geometric distortion
(See FIG. 1)
TOP & BOTTOM
LEFT & RIGHT
8 mm
8 mm
b. Barrel (See FIG. 2) TOP & BOTTOM
LEFT & RIGHT
6 mm
6 mm
2.4.9 Tilt (Raster Rotation) Less than †
††
† 4 mm
(The tilt is being Compared between the horizontal center
line of the image with respect to that of the bezel.)
2.4.10 Misconvergence
(See FIG. 5)
Zone A: 1.0 mm ( 465 mm )
Zone B: 1.5 mm (Within the image area of 620 mm x 465
mm except zone A.)
Zone C: 1.8 mm (Except zone A and B.)
2.4.11 Focus
(with mode 1 (
((
(
mode 9) (Test
with H character pattern.)
The individual dot and line of characters on the screen
should be clearly distinguishable. (Setting the Cut-off
raster brightness level at H pattern.)
2.4.12 CRT quality The screen & faceplate blemishes requirement is defined
based on CRT specification.
2.4.13 Color temperature
(PATTERN=ALL WHITE
PATTERN.)
X : 0.285 †
††
†
0.030
Y : 0.295 †
††
†
0.030
2.4.14 Color tracking
(Test full white pattern.)
X : X0†
††
†0.030
Y : Y0†
††
†0.030
brightness=128 change contrast control range from 4.5 FL
to max
2.4.15 Internal service controls :
HV-ADJUST (31 †
††
†1KV) H-Center DC B+ ADJUST (210 †
††
†1V)
FBT SCREEN KNOB FBT FOCUS
X (max.)
X (max.) - X (min.)
( X100%) 15%
Less than 15% for both H & V

SPECIFICATION VER 1.0
- 2- 5-
2.4.16 External user controls : (With OSD Control)
RGB : BRIGHTNESS CONTRAST V-SIZE H-CENTER H-WIDTH
H-PHASE PINCUSHION TRAPEZOID PARALLELOGRAM ROTATION
R-GAIN G-GAIN B-GAIN
AV. : BRIGHTNESS CONTRAST COLOR TINT SHARPNESS
R-GAIN G-GAIN B-GAIN
COMMON : POWER MUTE DEGAUSS WOOFER VOLUME RECALL
INPUT BASS TREBLE BALANCE
FRONT PANEL FUNCTION KEY : VOLUME +/- INPUT SELECT DEGAUSS
MENU +/- POWER SWITCH
3. MECHANICAL REQUIREMENTS
3.1. Unit dimension (with base) :
Packaging dimension :
W (886) x H (718) x D (583) mm
W (1035) x H (888) x D (765) mm
3.2. Net weight of unit : 71Kgs
4. Environmental requirements
4.1. Non-operating
a. Ambient temperature - 15 degree C to 50 degree C (5 degree F to 122 degree F)
b. Relative humidity 10% RH to 95% RH (non-condensing)
c. Altitude 10 000 feet
4.2. Operating
a. Ambient temperature 0 degree C to 40 degree C (32 degree F to 104 degree F)
b. Relative humidity 10% RH to 95% RH (non-condensing)
c. Altitude 10 000 feet
5. Reliability requirement
The MTBF needs 40000 hours (excluding tube) under operating at 25 †
††
†
5 degree C (77 †
††
†41
degree F) ambient temperature also with the normal characters filled within the whole image
screen.
6. Regulatory requirements
6.1. Safety requirement.
The unit shall conform to the following safety regulatory standards.
a. UL 1950 Safety of Information Technology Equipment Including Electrical
Business Equipment
b. CSA 22.2
No. 950-M89
Safety of Information Technology Equipment Including Electrical
Business Equipment
c. TUV
No. EN 60950
EN 60065
Safety of Information Technology Equipment Including Electrical
Business Equipment

S PECIFICATION VER 1.0
- 2- 6-
6.2. X Radiation requirement.
The unit shall conform to the following X-ray regulatory standards and must not emit more
than 0.5 mR/H of ionizing radiation under normal operation or under a fault condition.
a. DHHS 21 CFR
1020.10
Department of Health and Human Services Radiation Performance
Standard; Title 21 CFR subject J for Radiological Health (US)
6.3. Emission requirements.
The unit shall meet the EMI limits in all screen modes. For EMI testing the unit must be filled
with a screen pattern consisting of scrolling capital “H” characters also the brightness and
contrast VR will be adjusted to max. level.
a. FCC Class B FCC part 15 Subpart J Class B (US)
7. POWER MANAGEMENT:
Mode H-sync V-sync Video Power dissipation
Normal pulse pulse active normal power
Stand-by no pulse no pulse no video power off
pulse no pulse
Power saving no pulse pulse blanked less than 30 watts
This monitor is Energy star compliant when used with a computer equipped with DPMS.
Note: The power indicator LED color is green in normal state red in stand-by and yellow in
power saving state.
Attachment: Internal reference specification.
The following specifications are provided to Production Engineering and Quality
Assurance Departments for factory internal control only.
Item no. and contents of product specification Customer requirements
2.4.2 Horizontal size / vertical size 620 / 465 mm †
††
†8 mm
2.4.3 Size thermal drift within 8 mm
2.4.4 Size regulation within 7 mm
2.4.5 a. Max. brightness level (full white)
b. Max. brightness level (100% center block white
pattern)
21 FL +5 / -2 FL
73 FL +7 / -5 FL
(MODE 1)
2.4.6 Brightness uniformity greater than 50%
2.4.7 Linearity H 15%
V 15%
2.4.8 a. Geometric distortion
b. Barrel
TOP :
BOTTOM :
TOP :
BOTTOM :
within 8 mm
within 8 mm
within 6 mm
within 6 mm
2.4.9 Tilt (Raster Rotation) within 4 mm
2.4.10 Misconvergence within A:1.0 B:1.5 C: 1.8
2.4.11 Focus Reference page 5
2.3.13 Color temperature X : 0.285 †
††
†0.030
Y : 0.295 †
††
†0.030
2.3.14 Color tracking X : X0†
††
†0.030
Y : Y0†
††
†0.030
7. POWER MANAGEMENT :
a. Power saving PC < 30 watts

S PECIFICATION VER 1.0
- 2- 7-
AV. SECTION: (ACCORDING TO CTV RULES)
video signal compatibility NTSC / PAL / SECAM
1. Picture quality
1.1. Resolution (center)
Contrast and brightness is adjusted so that the 25% gray bar is at cut off of CRT 300 lines
min.
2. Linearity # formula: (max. - min.) / max. #
Vertical 10% 13% max.
Horizontal 10% 14% max.
3. Sound (tone & balance at central position)
3.1. Residual hum (at volume control max.) 500uW max.
3.2. Practical max. audio output (at 10% THD max.)
1.3VP-P 1K Hz input 10W min. / 7 ohm
3.3. Audio fidelity (400 Hz 0db Corrected for emphasis characteristics)
Woofer off 100 Hz 1 dB 3 dB
Woofer off 10K Hz -1 dB 3 dB
3.4. Sound distortion (at 250mW 1K Hz) 1% max. with LPF(15.734KHz)
4. Video and audio (full load)
4.1. Video signal output 1.0 VP-P †
††
† 0.2 VP-P.
(input signal at 1.0 VP-P †
††
† 0.2 VP-P)
4.2. Audio signal output 1.0 VP-P †
††
† 0.2 VP-P.
(input signal at 1.0 VP-P †
††
†
0.2 VP-P)
5. Total Geometric Distortion
5.1. Pincushion(FIG. 4)
Top-bottom 3% max.
Left-right 3% max.
*Pattern = crosshatch
5.2. Trapezoid (FIG. 3)
Horizontal 3.0% max.
Vertical 3.0% max.

SPECIFICATION VER 1.0
- 2- 8-
5. NO ROTATION FUNCTION 6. H-SIZE CAN NOT BE ADJUSTED !
!
!
!
!
!
!
!
!
!
!
!
!
!
!
Is the rotation coil
connector insert into RO
Check CPU and IC001
rotation circuit
Check Q691 Q692 Q693
control circuit
Check IC001 pin42 H-SIZE
control voltage
Check IC631 IC632 IC661
H-SIZE adjustment control
circuit
Check Q665 Q661 Q663
Q664 ZD661
465 m
Zone A
FIG.5 Misconvergence
465
mm
bezel
Zone C
620mm
Zone B
To
p
barrel
Right
barrel
Bottom barrel
Left
barrel
FIG. 2 Barrel:
To
p
Ri
g
ht
Bottom
Left
FIG. 1 Total Geometric Distortion:
FIG. 4 PINCUSHION: (AV)
a1
A B
c1 d1
C b1 D
Top-bottom=2(a1+b1)/(AC+BD)x100%
Left-ri
g
ht =2
(
c1+d1
)
/
(
AB+CD
)
x100%
FIG. 3 Trapezoid:
A B
C D
Horizontal = (AD-BC) / (AD+BC)x100
Vertical =
(
AB-DC
)
/
(
AB+DC
)
x100
Pattern = crosshatch
a1
b1 c1 d1

LOCAION OF USER'S CONTROL VER 1.0
- 3-1-
CONNECTING YOUR DISPLAY
1. AC IN : This terminal is for AC power cord.
2. S-VIDEO : This terminal (select AV2 mode) is for S-VIDEO signal cable, used with S-VIDEO equipment.
3. AV IN : These terminals are for video and stereo sound signals, used with video equipment.
4. RGB AUDIO IN: These terminals are for sound signal when monitor is in RGB mode.
5. AV OUT: These terminals can output video and sound signals that your monitor is using.
6. RGB IN: This terminal is for RGB analog signal, use with IBM PC and other compatibles.
7. RGB OUT: This terminal can output RGB analog signal that your monitor is using.
( This terminal is for rear RGB IN signals)
NOTE :
1. Please follow the above description when connecting your display.
2. If front RGB IN and rear RGB IN are connected simultaneously front RGB IN has
priority. To prevent interference disconnect the rear RGB IN signal when the front
RGB IN signal is in use.
AC IN
VIDEO R AUDIO
AV1
AV2
A
VIN
V R
A
VOUT
S-VIDEO
①
③
②
A
UDIO IN
AUDIO IN
L
R
④
⑤
RGB IN
⑥
RGB OUT
⑦

LOCATION OF USER'S CONTROL VER 1.0
- 3-2-
(ON FRONT PANEL)
Front view
RGB IN
°
°°
° ↓
↓↓
↓
NOTE :
1. RGB IN: Is used to Connect the RGB signal. For IBM PC and other compatibles.
3. The RGB INPUT terminals in the front and rear panels have the same function. They can connect to
the signal source (PC) simultaneously. To prevent interference do not switch the two signal
sources (PC) on simultaneously.
RGB IN
ADJUST
DEGAUSS VOL
MENU
INPUT
SELECT STAND
BY↓
↓↓
↓
POWER
SAVING
POWER

LOCATION OF USER'S CONTROL VER 1.0
- 3-3-
( ON REMOTE CONTROL)
Power button
Recall button
Mute button
Degauss button
Input button
Volume +/- button
POWER MUTE
RECALL DEGAUSS
MENU- MENU +
ADJ
WOOFER
VOLUME
Adjust +/- button
Menu +/- button
Woofer button

LOCATION OF USER'S CONTROL VER 1.0
- 3-4-
INSTALLATION
1. Before you connect any cables, refer to the safety instructions at the beginning of this manual and make
sure your computer ( or video equipment ) and display are switched off .
2. Connect the video cable (AV, S-Video or RGB cable) and audio cable to your monitor.
3. Connect the AC power cord to your monitor.
4. Plug the AC power cord to a properly grounded outlet.
5. Turn on your computer or video equipment.
6. Turn on your monitor‘s power by pushing the power button. The power indicator should be illuminated.
NOTE : If the button does not function due to interference disconnect from the
mains for 10 seconds. Then reconnect and turn the power on.
GAME PLAYER
VIDEO R AUDIO
AV1
AV2
AV IN
V R
A
V
OU
T
S-VIDEO
VTR
A
C
IN
ADUIO IN
ADUIO IN
L
R
RGB IN
LASER DISK OR DVD
PC/NOTEBOOK
RGB OUT
MONITOR

DISASSEMBLY AND REASSEMBLY VER 1.0
4-1
www.rtv-horvat-dj.hr

FACTORY & ELECTRONIC ADJUSTMETNT VER 1.0
- 5-1-
WARNING: BEFORE SERVICING THIS CHASSIS READ THE
“X-RAY RADIATION PRECAUTION” “SAFETY PRECAUTION”
AND “PRODUCT SAFETY NOTICE” ON PAGE 1 AND 2 OF THIS
MANUAL.
SET-UP ADJUSTMENT
zThe following adjustments should be made when a complete realignment is required or a new
picture tube is installed.
Perform the adjustments in order as follows :
1. Purity
2. Distortion (Vertical) balance
3. Convergence
4. Focus
Note: The PURITY/CONVERGENCE MAGNET assembly and rubber wedges need mechanical
positioning.
PART DESCRIPTION PART NO.
CPT Picture tube M81AHM50X01 VBM81AHM50X01
DY Deflection yoke YS-70840 RDY-N1004-1----
40MAX
90MAX
PURITY/
CONVERGENCE
MAGNET ASS‘Y
(CPM)
DEFLECTION
YOKE
(DY)
1
2
3
2
DEFLECTIO
N YOKE
(DY)
AD ESIVE
(Silicon)
RUBBER WEDGE
(
Ta
p
e
)

FACTORY & ELECTRONIC ADJUSTMETNT VER 1.0
- 5-2-
PURITY ADJUSTMENT
NOTE: Before attempting any PURITY ADJUSTMENTS the receiver should be operated for at least
30 minutes at White Rasher.
1. Demagnetize the picture tube and cabinet using a degaussing coil. (East direction)
2. Slowly move the DY forward or backward with moving 2 pole magnet of CPM until Green beam
registration rank “a” is become
Tighten the clamp screw of the DY with correct rasher-rotation.
DISTORTION (VERTICAL) BALANCE ADJUSTMENT
Tilt front of DY up or down to obtain best balance of Top and Bottom distortion.
CONVERGENCE ADJUSTMENT
NOTE: Before attempting any convergence adjustment the receiver should be operated for at least 15
minutes.
1.Pan front of DY right or left to obtain better convergence of Yv (R or B wide pattern) and put d
dd
d
WEDGE into right and left space with temporary Mounting WEDGE.
B
B
R
R
Registration Rank Rasher-rotation
a a
60mm
+0.74
1 dot
Face to south
-0.74
1 dot

FACTORY & ELECTRONIC ADJUSTMETNT VER 1.0
- 5-3-
2. Xv misconvergence adjustment:
Adjust the Xv coil (on the deflection yoke) to correct misconvergence at both sides on screen. (See
the figure below.)
Use a hexagonal tip stick (plastic) to adjust the core of coil.
3. Center convergence adjustment
1) Receive crosshatch pattern from a color
bar/pattern generator.
2) Adjust the BRIGHTNESS and CONTRAST
Controls for well defined pattern.
3) Adjust two tabs of the 4-Pole Magnets to
change the angle between them (See figure
3.) and superimpose red and blue vertical
lines in the center area of the picture
screen.(See figure 4.)
4) Turn the both tabs at the same time keeping
the constant angle to superimpose red and
blue horizontal lines at the center of the
screen. (See figure 4)
5) Adjust tow tabs of 6-Pole Magnets to
superimpose red/blue line with green one.
Adjusting the angle affects the vertical
lines and rotating both magnets affects
the horizontal lines.
6) Repeat adjustments 3 4 5 keeping in
mind red green and blue movement
because 4-Pole Magnets and 6-Pole
magnets interact and make dot movement
complex.
!
!
!
!
R B
B R
B R
R B
Xv Cross Pattern View
Clockwise Counterclockwise
Center Convergence by Convergence Magnets
Figure 4.
BLUE RED
BLUE
RED
4-POLE MAGNETS
MOVEMENT
RED/BLUE GRN
RED/BLUE
GRN
6-POLE MAGNETS
MOVEMENT
ADJUST T E ANGLE
(
VERTICAL LINES
)
ROTATE TWO TABS
AT T E SAME TIME
( ORIZONTAL LINES)
FIXED
ADJUSTMENT OF MAGNETS
Figure 3.