Text preview for : Iiyama Color Monitor VisionMaster Pro 450,A901HT Parts & Service.pdf part of Iiyama VisionMaster 450 Another upload courtesy of justmanuals.com
Back to : Iiyama Color Monitor Visi | Home
NO. S1998E01
September 22, 1998
SERVICE MANUAL
A901HT
Copyright IIYAMA ELECTRIC CO., LTD.
710-1 Kitaowaribe, Nagano-shi 381-0014 JAPAN
[ Revision Record ]
Rev. Section Contents
justmanuals.com
CONTENTS
Page
SAFETY PRECAUTION............................................................................. i-ii
1. SET-UP ADJUSTMENTS............................................................................... 1-15
2. TIMING CHART.............................................................................................. 16
3. IC APPLICATION........................................................................................... 17-19
4. CIRCUIT DESCRIPTION................................................................................. 20-27
5. SERVICE PARTS LIST................................................................................... 28-53
6. EXPLODED VIEW......................................................................................... 54-61
7. DIAGRAMS................................................................................................... 62-64
NOTICE
The information in this document is subject to change without notice.
1. SET-UP ADJUSTMENTS
The following adjustments should be made when a complete realignment is required or a new picture tube is
installed.
Signal generator (Programmable video generator)........................ Leader 1604A
DC voltmeter (300V DC range)
Note: Digital multimeter can also be used.
High voltage probe (0-30kV DC)
Color analyzer.......................................................................... Minolta CA-100
Photometer............................................................................. Minolta LS-100
Electric field meter.................................................................... Combinova EFM 100
Scale (Two 50cm scales put together so that no visual aberration occurs.)
Frequency counter
Digital wattage meter
Landing meter........................................................................... LSS LND-070 or 072
Degausser
Interface adapter (Iiyama handmade)
Short-connector (Iiyama handmade)
1. Place the monitor without tilting.
2. Connect the signal cable from the signal generator to the monitor.
3. Face the CRT screen to east so as not to be influenced by magnetic force.
4. Turn ON the Power Switch, and degauss the entire screen with degausser. èSee "EXTERNAL DEGAUSS".
5. Perform adjustment by setting the brightness to center and the contrast to maximum, except where
specifically indicated.
6. Receive MODE 5 and turn ON the Power Switch. Perform adjustment after a warm-up of at least an
hour.
7. Adjustment data is automatically saved in the memory when the on screen display disappears, when
another signal is received, or pressing the Menu and Buttons at the same time.
Note: This monitor should be checked and adjusted by connecting it to a signal generator, then entering
and running the timing charts both below and of Chapter 2.
fH Sync polarity Sync Horizontal (µsec) Vertical (msec)
Resolution* on
(kHz) H V Comp green A B C D E O P Q R S
24.8 640×400 N N 40.27 3.04 3.99 30.39 2.85 17.719 0.322 1.007 16.108 0.282
27.3 608×420 N N 36.76 4.41 2.21 27.94 2.20 16.652 0.074 0.771 15.439 0.368
31.5 640×400 N P 31.778 3.813 1.907 25.422 0.636 14.268 0.064 1.112 12.711 0.381
33.0 712×419 N N 30.30 2.01 0.99 26.96 0.34 16.665 0.061 3.636 12.696 0.272
47.6 1024×720 N N O O 21.00 2.00 2.36 15.76 0.88 16.695 0.084 0.420 15.115 1.076
110.0 384×1152 P P 9.09 0.80 1.48 6.41 0.40 11.108 0.027 0.582 10.472 0.027
115.0 400×666 P P 8.68 0.89 1.14 6.38 0.27 6.249 0.026 0.416 5.781 0.026
118.0 400×1200 P P 8.47 0.87 1.13 6.22 0.25 10.660 0.025 0.455 10.171 0.009
* The resolutions are only for your reference when using Leader 1604A.
-1-
justmanuals.com
ADJUSTMENT MODE
There are two different modes available to adjust the monitor as described below. The adjustment with `o' in front
of the title are only available under User Mode. The adjustments with `n' in front of the title are only available under
Factory Mode. You can perform the other adjustments by either User or Factory Mode. Please change the mode
as required.
USER MODE:
Turn ON the Power Switch and you are in the User Mode.
FACTORY MODE: There are two ways to enter the Factory Mode.
1. Turn OFF the Power Switch. Connect the Iiyama short-connector to the RS connector on the PWB-
MAIN and set S1 switch on the PWB-RS of the short-connector to ADJ.MODE side. Turn ON the Power
Switch and you are in the Factory Mode. The following menu appears on the screen when you press the
MENU Button. Turn OFF the Power Switch and remove the short-connector from the RS connector to exit.
PWB-MAIN
RS connector
Short-connector
PWB-RS
ADJ.MODE E2PROM
S1
CRT
CRT face
2. Turn ON and OFF the Power Switch while pressing the MENU Button. Turn ON the Power Switch again while
pressing the Button and you are in the Factory Mode. The following menu appears on the screen when you
press the MENU Button. Turn OFF the Power Switch to exit.
DF DP
The menu items in the Factory Mode are as follows:
Contrast Trapezoid Uniform-V-TB N-S RRC V-linear-S
Brightness Parallelogram Uniform-HCENT DBF-Para V-linear-C
V-size Side-pin-balance Uniform-H-RL DBF-Phase Auto-da-test1
V-position Side-pin-corner Landing-TL H-moire Auto-da-test2
H-size Cushion-side Landing-TR H-convergence Auto-da-test3 *
H-position DEGAUSS Landing-BL V-convergence CRT Check
Pin-cushion Uniform-VCENT Landing-BR Tilt-dy
* Auto-da-test3 helps you to perform H/V-BLANKING and H/V-CONVERGENCE confirmations in this
SET-UP ADJUSTMENTS. The following items are displayed automatically in turn.
1. H/V-convergence è 2. Tilt-dy è 3. N-S RRC è 4. Landing-TL/TR/BL/BR è 5. H/V-blanking
-2-
EXTERNAL DEGAUSS
Make sure you disable the Landing-TL/TR/BL/BR and N-S RRC settings before performing the external degauss.
Follow the procedure below depending on the adjustment mode you are in.
PROCEDURE
o USER MODE
1) Select Degauss and press the MENU Button so that the Landing-TL/TR/BL/BR and N-S RRC will be
disabled.
2) Degauss the entire screen with degausser while the Degauss is activated (approx. 6 seconds).
n FACTORY MODE
1) Select CRT Check and press the MENU Button so that the Landing-TL/TR/BL/BR and N-S RRC will
be disabled.
2) Confirm that the OSD stays displayed on the screen.
Note: If the OSD disappears, restart from 1).
3) Degauss the entire screen with degausser.
4) Press the MENU Button twice to turn off the OSD.
LOCK OUT FACILITY
User adjustable items can be restricted to the following three lock out types by setting the lock out facility as
described below.
Lock out type Menu * / Adjustment item available
A Menu 1
B Menu 1, 3, 5
C Contrast, Brightness * It shows the number of the standard menu page.
PROCEDURE
1.To make the lock out facility available
1) Minimize the contrast with the front buttons.
2) Turn OFF and ON the Power Switch.
3) When degaussing starts, press the MENU, and + Buttons in turn so that the lock out facility is activated.
Lock out type is switched in alphabetical order when you repeat the button operation.
2. To cancel the lock out facility
1) Minimize the contrast with the front buttons.
2) Turn OFF and ON the Power Switch.
3) When degaussing starts, press the MENU, + and Buttons at the same time. Then, press the MENU,
and + Buttons in turn so that the lock out facility is canceled.
Note: This button operation should be performed while degaussing.
-3-
justmanuals.com
1-1. 80V-ADJ adjustment [PWB-MAIN]
Voltage
1) Receive a cross-hatch inverted signal of MODE 5 when applying the AC
voltage of 110±10V.
2) Connect the DC voltmeter between CONNECTOR TP and GND (chassis).
3) Adjust the voltage to DC 80±0.5V with VR930 (+B ADJ).
VR930 +B ADJ
1-2. ANODE VOLTAGE adjustment [PWB-MAIN]
WARNING !
VR501 (HV-ADJ) has been carefully factory-adjusted for each unit in order
to satisfy regulations regarding X-radiation.
Further adjustment on VR501 shall not be performed.
In case of adjustment, the adjusted position of VR501 must be fixed by a
soldering iron to prevent it from rotating.
1) Receive a cross-hatch inverted signal of MODE 5.
2) Turn OFF the Power Switch.
3) Connect a high-voltage probe between CRT anode and GND (chassis).
Voltage
4) Turn ON the Power Switch.
5) Adjust the high-voltage to 27.0±0.1kV with VR501 (HV-ADJ).
6) Confirm the variation of high-voltage is within ±0.2kV when receiving MODE
1 and MODE 6 respectively.
7) Turn OFF the Power Switch and remove the high-voltage probe. VR501 HV-ADJ
1-3. SCREEN VOLTAGE adjustment [PWB-MAIN]
1) Receive a cross-hatch inverted signal of MODE 5.
2) Turn ON the Power Switch.
3) Connect a high-voltage probe between LEAD-CONNECTOR SC on the
PWB-MAIN / CONNECTOR SC on the PWB-VIDEO and GND (chassis). Voltage
4) Adjust the screen voltage to 630±10V with SCREEN VR located lower of
CREE
T501 (FBT).
S
N
Note: SCREEN VR should not be turned after the adjustment above.
T501(FBT)
-4-
1-4. POWER FACTOR CIRCUIT confirmation [PWB-MAIN]
1) Receive a cross-hatch inverted signal of MODE 5.
2) Turn OFF the Power Switch.
3) Connect the DC voltmeter between TP4 and TP0.
4) Turn ON the Power Switch.
5) Confirm that the voltage is DC 400±10V.
6) Remove the DC voltmeter.
n1-5. TEMPERATURE SENSOR confirmation
1) Receive a cross-hatch inverted signal of MODE 5.
CRT Check
2) Select CRT Check and press the MENU Button. ||||| ···· 30 ····30 ···········
3) Confirm that respective temperature of fan and monitor front displayed Fan Monitor front
on the screen is as follows: actual temperature ±5°C.
n1-6. FREE-RUNNING adjustment
1) Receive a cross-hatch inverted signals of fH 27.3kHz and 115.0kHz
respectively.
2) Confirm that FREE-RUNNING adjustment is automatically performed.
n1-7. FH-LIMITER confirmation
1) Receive a cross-hatch inverted signal of fH 24.8kHz.
2) Confirm that the picture disappears. Also, make sure the horizontal
oscillation frequency is within the specified range: 55-70kHz.
3) Receive fH 27.3kHz and confirm that the picture is synchronized.
4) Receive fH 118.0kHz and confirm that the picture disappears. Also, make
sure the horizontal oscillation frequency is within the specified range above.
5) Receive fH 115.0kHz and confirm that the picture is synchronized.
6) Turn OFF the power of signal generator and confirm that the picture
disappears. Also make sure the horizontal oscillation frequency is within
the specified range above.
7) Remove the frequency counter.
n1-8. H-SIZE LIMIT adjustment
1) Receive a cross-hatch inverted signals of fH 33.0kHz and 110.0kHz
respectively.
2) Adjust the horizontal size (H-size) to make it full-scan.
-5-
justmanuals.com
n1-9. H-BLANKING confirmation
x
1) Receive a cross-hatch inverted signal of MODE 5.
2) Minimize the horizontal size (H-size) with the front buttons. Raster rolling Picture
3) Select Auto-da-test3 and press the MENU Button so that the automatic
confirmation program starts.
4) Confirm that X of the right hand side figure is as follows: X 5) Adjust the horizontal size roughly with the front buttons.
n1-10. V-BLANKING confirmation
1) Receive a cross-hatch inverted signal of MODE 5.
2) Adjust the vertical size and position (V-size and V-position) of the picture
roughly with the front buttons.
3) Select Auto-da-test3 and press the MENU Button so that the automatic Raster rolling Raster tearing
confirmation program starts.
4) Confirm that the back-raster is not rolling or tearing at the top. Picture Picture
5) Confirm that no retrace line is over the picture.
n1-11. V-LIN adjustment
A
1) Receive a cross-hatch inverted signal of MODE 5.
2) Adjust the vertical size so that the size is 270±4mm.
C
3) Adjust the vertical linear corner (V-linear-C), so that difference between A
and B of the right hand side figure is as follows: | AB | B
4) Adjust the vertical linear side (V-linear-S), so that A, B and C are almost
equal.
n1-12. H-CENT adjustment [PWB-MAIN] S501
1) Receive a cross-hatch inverted signal of MODE 5.
2) Adjust the horizontal size and position of the picture roughly with the front Right Left
buttons. Back-raster
3) Maximize the brightness so that the back-raster appears on the screen.
4) Set S501 to the right, center or left so that A and B in the right hand side A B
Picture
figure are almost equal.
5) Return the brightness to center indication.
Bezel
n1-13. TILT-DY adjustment
1) Receive a cross-hatch inverted signal of MODE 5.
2) Adjust the tilt deflection yoke (Tilt-dy) with the +/ Buttons so that X of the
right hand side figure is as follows: | X |
-6-
n1-14. PICTURE SIZE, POSITION AND DISTORTION adjustment (Criteria)
1) Receive a cross-hatch inverted signal of MODE 4. C
2) Adjust the picture size and position to the specified setting below. A B
Picture
H-size: 360±4mm H-position: | AB |<4mm
V-size: 270±4mm V-position: | CD |<4mm
D
3) Correct the side distortion with the front buttons so that X of the right hand
side figure is as follows: | X | remarkable distortion with the naked eye.
Pin-cushion Parallelogram
Trapezoid Side-pin-corner 30mm
Side-pin-balance Cushion-side
X
n1-15. PICTURE SIZE, POSITION AND DISTORTION adjustment Picture
1) Receive a cross-hatch inverted signal of fH 31.5kHz.
2) Adjust the picture size, position and distortion roughly with the front buttons
to the reference settings below.
Pin-cushion
H-size: 360±10mm H-position: | AB |<8mm
V-size: 270±10mm V-position: | CD |<8mm
| X | distortion with the naked eye.
Note: The picture should be within the bezel.
Side-pin-balance
3) Receive a cross-hatch inverted signal of all preset modes respectively.
4) Adjust the picture size and position to the specified setting below.
H-size: 360±4mm H-position: | AB |<4mm Parallelogram
V-size: 270±4mm V-position: | CD |<4mm
5) Correct the Pin-cushion and Trapezoid distortion with the front buttons so Side-pin-corner
that X of the right hand side figure is as follows: | X | when selecting the most remarkable distortion with the naked eye.
Note: No other adjustment items for distortion than the above should be Cushion-side
adjusted.
o1-16. RESET confirmation
1) Receive a cross-hatch inverted signal of MODE 5.
2) Change the horizontal position (H-Position) roughly with the front buttons.
3) Perform Reset.
4) Confirm that the adjustment data above is reset to the factory setting.
-7-
justmanuals.com
n1-17. Automatic COLOR adjustments
WARNING: Do not change the horizontal and vertical sync signal or the frequency
while the automatic COLOR adjustments are underway.
Color analyzer setting: cd/m² fL
l Luminance unit switch: cd/m 2 Luminance unit switch
l B.P.S. DIP switch: 9600 (1000)
l Turn ON the color analyzer switch and press 0-CAL switch before use. 1
0
B. P. S. DIP switch
1) Be sure to enter the Factory Mode by using the short-connector.
2) Connect the interface adapter from RS-232C of the color analyzer to the
PWB-RS of the short-connector.
3) Select BNC for the signal input and receive a white window signal of MODE 4.
4) Turn OFF the R, G and B outputs on the signal generator.
5) Apply a color analyzer probe to the center of the screen.
6) Turn ON the Remote Switch of the color analyzer so that "G" will appear
on the screen to inform that automatic CUT-OFF adjustment starts.
7) Turn ON the R, G and B outputs on the signal generator when "GBRIN"
appears on the screen so that the COLOR TEMPERATURE and
CONTRAST LIMIT adjustments start automatically.
The X and Y specified readings of the color analyzer are as follows:
CT 1 (9300K) CT 2 (6500K) CT 3 (5000K)
X: 0.283±0.006 X: 0.313±0.006 X: 0.345±0.006
Y: 0.297±0.006 Y: 0.329±0.006 Y: 0.352±0.006
The specified contrast range is 120±6cd/m2.
Note: "G" appears again on the screen to indicate the contrast is not
within the specified range above. In that case, repeat 4) to 7).
8) "END" appears on the screen to inform that the adjustments are completed.
9) Turn OFF the Remote Switch of the color analyzer.
Note: The adjustments above can be repeated by turning OFF and ON the
Power Switch.
m
n 1-18. GRAY SCALE confirmation
.co
1) Receive a 16-gradation gray scale signal of MODE 4.
ls
ua
2) Make sure the 15th gradation on the gray scale is barely visible when the
an
16th gradation (back raster) is not visible at all.
tm
jus
-8-
n 1-19. BRIGHTNESS adjustment [PWB-MAIN] Brightness
1) Receive an entire white raster signal of MODE 4.
2) Apply a photometer to the screen center.
3) Adjust VR502 (ABL-ADJ) so that photometer reads 105±5cd/m2.
VR502 ABL-ADJ
n 1-20. SYNC SIGNAL INPUT confirmation
1) Receive a cross-hatch inverted signal of fH 47.6kHz.
2) Select composite and sync on green signal inputs respectively by the
signal generator.
3) Confirm that the picture is displayed normally.
1-21. SIGNAL SELECT confirmation
1) Receive a cross-hatch inverted signal of MODE 5.
2) Switch the signal input to BNC and D-SUB respectively.
3) Confirm that the picture is displayed normally.
o 1-22. POWER MANAGEMENT confirmation
1) Turn OFF the Power Switch and connect a digital wattage meter.
2) Turn ON the Power Switch.
3) Receive a cross-hatch inverted signal of MODE 5.
4) Turn OFF the R, G and B outputs on the signal generator.
5) Disconnect the H/HV and V cables.
6) Confirm that the input wattage is 5W or less and the Power Indicator turns
to orange.
7) Connect the H/HV and V cables and confirm that the picture appears.
8) Turn OFF the Power Switch and remove the digital wattage meter.
9) Turn ON the Power Switch.
n 1-23. H-CONVERGENCE confirmation
1) Receive a cross-hatch inverted signal of MODE 5.
2) Select Auto-da-test3 and press the MENU Button so that the automatic
confirmation program starts.
3) Confirm that the horizontal line is diverged.
-9-
justmanuals.com
n 1-24. V-CONVERGENCE confirmation
1) Receive a cross-hatch inverted signal of MODE 5.
2) Select Auto-da-test3 and press the MENU Button so that the automatic
confirmation program starts.
3) Confirm that the vertical line is diverged.
Back-raster
n 1-25. RASTER REGULATION (DYNAMIC) confirmation
1) Receive an entire white signal of MODE 5.
Picture
2) Set the input signal by the signal generator as follows:
W
V-DISP-TIME: 150 V-POSI-TIME: 450
3) Maximize the brightness or set the signal level to 0.9Vp-p by the signal
generator.
4) Confirm that turning the luminance volume on the signal generator to the maximum
and "1" respectively. FOCUS-B
5) Return the brightness to center indication.
FOCUS-A
n 1-26. FOCUS [PWB-MAIN]
SCREEN
1) Receive a green cross-hatch signal of MODE 5.
2) Adjust FOCUS-A VR of T501 (FBT) to make the vertical lines sharpest at
T501(FBT)
points L, M and R as shown in Fig 1.
3) Adjust FOCUS-B VR of the T501 to make the horizontal center line Focus
sharpest at points L, M and R as shown in Fig. 1.
4) If the focus at points T and M is as shown in Fig. 2, adjust VR503 (V-DBF)
to make the horizontal lines have the same thickness at points T, M and
B. And adjust the FOCUS-B VR again to make the horizontal lines sharpest
at points T, M and B. (VR503 should not be adjusted when focus at points VR503 V-DBF
T and M is optimum.)
5) If the focus at points L and M is as shown in Fig. 3 or vice versa, adjust
DBF-Para to make the horizontal center line have the same thickness at L M R
points L, M and R. And adjust the FOCUS-B VR again to make the
horizontal center line sharpest at points L, M and R. (DBF-Para should
not be adjusted when focus at points L and M is optimum.) Fig.1
6) Repeat 2) to 5) until the focus is optimum. T Thin
7) Confirm no focus variation on the entire screen.
M Thick
8) Check the focus with red and blue respectively.
B Thin
9) Receive a H-character signal and repeat 7).
Fig.2
10) Repeat the FOCUS adjustments until the focus with red, green and blue
is optimum.
L M R
Thick Thin Thick
- 10 - Fig.3
n 1-27. LUMINANCE DIFFERENCE adjustment
1) Receive an entire white signal of MODE 5.
2) Apply a photometer to C (center), T (top), B (bottom), L (left) and R (right) T
in the right hand side figure.
3) Confirm that the luminance difference between C and T, C and B, C and L, L C R
C and R is within ±10cd/m2 respectively.
B
4) If the luminance difference is not within the specified range above, perform
the following adjustments:
1. Adjust Uniform-VCENT first to increase the brightness of T and B.
2. Adjust Uniform-V-TB so that the luminance difference between C and
T or C and B is within ±10cd/m2.
1. Adjust Uniform-HCENT first to increase the brightness of point L and R.
2. Adjust Uniform-H-RL so that the luminance difference between C and
L or C and R is within ±10cd/m2.
1-28. LUMINANCE DIFFERENCE confirmation
1) Receive an entire white signal of MODE 5. TL T TR
2) Apply a photometer to the two points where the luminance difference is L C R
remarkable with the naked eye.
BL B BR
3) Confirm that the luminance difference is 22.5cd/m2 or less.
- 11 -
justmanuals.com
1-29. TCO requirement
1-29-1. VLF adjustment [PWB-MAIN]
Note: The VLF adjustment requires the precise measuring conditions. Make
sure the adjustment is carried out in the following environment.
1. All metal parts should be attached to the monitor.
2. All the electrical equipment used for the adjustment including the
monitor should be grounded to the same outlet. 1.5m
3. Set the monitor and the electric field meter with tilt of zero degree at
a distance of 29.5±0.5cm so that the CRT face will be parallel to the
electric field meter.
4. No other monitors should be placed in the area with a radius of 1.5m Monitor Monitor
behind the center of monitor, between the monitor and the electric 20cm 29.5+0.5cm
field meter and 1.0m behind the electric field meter. Electric field meter
5. Keep at least 20cm between the monitors.
6. The VLF level of background should be 0.3V/m or less when the 1.0m
monitor power cable is disconnected.
1) Receive a H-character inverted signal of MODE 6. VLF level
2) Adjust the contrast so that the brightness at screen center is 60±5cd/m2.
3) Set the brightness to center indication.
4) Turn VR5T2 (VLF-2) fully counterclockwise.
VR5T1 VLF-1
5) Adjust VR5T1 (VLF-1) so that the electric field meter reads the VLF level VR5T2 VLF-2
0.95V/m or less.
6) In case that the VLF level is not within the specified range above, adjust
VR5T2.
7) In case that the VLF level is still not within the specified range above, turn
VR5T2 fully clockwise and adjust VR5T1.
8) In case that the VLF level is still not within the specified range above,
adjust VR5T2.
- 12 -
n 1-30. ITC (Integrated Tube Component) adjustments
The following ITC adjustments should be made only when a new picture tube is installed, or convergence is poor.
All set-up adjustments above-mentioned must be completed before any further ITC adjustment is attempted.
Receive an entire white raster signal and turn ON the Power Switch. Perform adjustment after a warm-up of at least
an hour.
Perform the following adjustments by setting H-convergence and V-convergence to center indication.
Notes: See Chapter 5 concerning parts list for the ITC adjustments.
* PURITY MAGNET should not be turned during the ITC adjustments.
< Top view > < Side view >
PURITY MAGNET*
XV
4-POLE MAGNET
6-POLE MAGNET
YV YHC YH
YVS
DEFLECTION
YOKE
XV
LOCKING RING
SEPARATOR BOW MAGNET
CRT face DIFFERENTIAL
COIL
1-30-1. LANDING correction
Landing meter setting:
l Mode Select Switch: Monitor Normal
Note: Mode Select Switch should be set before turning on the power switch of the landing meter.
l Volt: 2V
l Time: 50ms
l Gain: 7
l Unit: % for LND-070, 0.8µm (1%=0.8µm) for LND-072
1) Face the CRT screen to east and set it vertically.
2) Degauss the entire screen with degausser. è See "EXTERNAL DEGAUSS".
3) Select DEGAUSS and press the MENU Button.
20mm
4) Receive an entire green signal.
5) Adjust the horizontal size to make it full-scan. TL T TR 20mm
6) Apply the landing meter to TL (top-left), TR (top-right), BL (bottom-left) and
BR (bottom-right) in the right hand side figure.
BL B BR
7) Confirm that "H" reading of the landing meter is within ±20% at each point.
8) Adjust N-S RRC with the front buttons so that the "H" reading difference
between T (top) and B (bottom) in the right hand side figure is as follows:
| T-B | = ±3%.
9) Adjust Landing-TL, TR, BL and BR respectively with the front buttons so
that "H" reading of the landing meter at each point is as follows:
TL: 8 to 2% TR/BL: 0 to +6% BR: 6 to 0%
- 13 -
justmanuals.com
1-30-2. Yvs adjustment
Picture Picture
Notes: 1. This adjustment should be performed only when the picture
distortion in the right hand side figure is permitted.
2. Be sure to perform the 1-30-6. YV adjustment after this
adjustment because the convergence adjusted by YV volume Bezel
is changed at the same time during this adjustment.
Picture
1) Receive a cross-hatch inverted signal.
2) Adjust the specified Yvs volume so that the picture distortion is corrected.
1-30-3. STATIC CONVERGENCE adjustment B R
R
1) Receive a red and blue cross-hatch signal. B
2) Adjust the 4-POLE MAGNET so that red and blue beams converge on the
center cross lines.
R,B G
3) Add green to the red and blue cross-hatch signal. G
4) Adjust the 6-POLE MAGNET so that red and blue beams converge with R,B
green beam on the center cross lines.
5) Repeat the adjustment until red, blue and green beams converge each R,G,B
other.
R,G,B
6) Fix the 4-POLE MAGNET and the 6-POLE MAGNET by turning the
LOCKING RING.
7) Mark the 4-POLE MAGNET and the 6-POLE MAGNET with paint marker
(090Z029A01) so that adjusted position is understandable.
1-30-4. BOW MAGNET adjustment
R
1) Receive a red and blue cross-hatch signal.
B
2) Adjust the BOW MAGNET so as to straighten an arched horizontal line.
Note: Must be careful not to misconverge vertical lines by this adjustment.
B
3) Perform the 1-30-3. STATIC CONVERGENCE adjustment so as to converge
the red and blue lines. R
4) Fix the BOW MAGNET with paint (090Z020A01).
1-30-5. DIFFERENTIAL COIL adjustment (XV adjustment)
R
1) Receive a red and blue cross-hatch signal.
B
2) Adjust the DIFFERENTIAL COIL so that the horizontal cross line converge
each other.
R,B
- 14 -
1-30-6. YV adjustment B
R
1) Receive a red and blue cross-hatch signal.
R
2) Adjust the specified YV volume so that red and blue beams converge B
each other at the upper and lower edges of the horizontal line.
R,B
R,B
1-30-7. YH adjustment Y HC YH
B R B R
1) Receive a red and blue cross-hatch signal.
2) Adjust the specified YH volumes so that vertical cross lines converge
each.
R,B
1-30-8. SCREEN-CORNER MISCONVERGENCE correction R
B
1) Receive a red and blue cross-hatch signal.
B
2) Affix a *ferrite sheet (890Z003A02/890Z003A03) between SEPARATOR R
and CRT corresponding to the partially misconverged areas.
RB BR
Note: Must be careful not to affect distortion by this correction.
3) Fix the ferrite sheet with ACETATE-TAPE (890P306A10).
10
10
Ferrite
100
70
(in mm)
(890Z003A02) (890Z003A03)
*Ferrite sheet
- 15 -
justmanuals.com
2. TIMING CHART
Video
Sync
B C D E P Q R S
H-parameters V-parameters
A A: Total period O O: Total period
B: Sync.width P: Sync.width
C: Back porch Q: Back porch
D: Active video R: Active video
E: Front porch S: Front porch
- 16 -
Sync polarity Sync Horizontal (µsec) Vertical (msec)
fH fV
Mode VESA Timing Name on
(kHz) (Hz) H V Comp green A B C D E O P Q R S
1 640×480 @ 60Hz 31.469 59.940 N N 31.778 3.813 1.907 25.422 0.636 16.683 0.064 1.048 15.253 0.318
2 640×480 @ 85Hz 43.269 85.008 N N 23.111 1.556 2.222 17.778 1.556 11.764 0.069 0.578 11.093 0.023
3 800×600 @ 85Hz 53.674 85.061 P P 18.631 1.138 2.702 14.222 0.569 11.756 0.056 0.503 11.179 0.019
4 1024×768 @ 85Hz 68.677 84.997 P P 14.561 1.016 2.201 10.836 0.508 11.765 0.044 0.524 11.183 0.015
5 1280×1024 @ 85Hz 91.146 85.024 P P 10.971 1.016 1.422 8.127 0.406 11.761 0.033 0.483 11.235 0.011
6 1600×1200 @ 85Hz 106.250 85.000 P P 9.412 0.837 1.325 6.972 0.279 11.765 0.028 0.433 11.294 0.009
3. IC APPLICATION
Ref No. Description Application Ref No. Description Application
Deflection circuit Sub microprocessor circuit
IC350 UPC1884CT H&V synchronous signal processor IC701 741Z611-10 Sub microprocessor
with geometrical compensation, H&V IC703 M62393P D/A converter
oscillator
IC401 LA7840L Vertical output High voltage circuit
IC502 SLA5041 FET array IC501 MSPAD104 High voltage control
IC503 324 Amplifier (H-size, Distortion
c o n t r o l ) Video circuit
Power circuit
IC101 M52755SP Signal switch
IC205 7805 5V regulator
IC102 24LC21 DDC
IC206 PQ6RD083 6.3V regulator (to CRT heater voltage)
IC201 M52742ASP Video amplifier
IC304 7805 5V regulator
IC202 LM2403T Video output
IC351 7812 12V regulator
IC203 M35045 On screen display control
IC702 7812 12V regulator
IC207 M52759SP Uniformity control
IC709 7805 5V regulator
IC210 324 Amplifier (Cut-off control)
IC930 3842 Main power control
IC931 MIP0223SY Sub power control CRT circuit
IC932 MC34262/ Power factor control IC704 LA6510/ Power amplifier
MC33262 TA8410AK (TILT+/, NS+/)
IC960 7812 12V regulator IC705 LA6510/ Power amplifier
IC961 3842 TA8410AK (H-CONV+/, V-CONV+/)
Variable B control
IC962 UPC1093J/ Over voltage, Arc and X-ray pro- IC706 LA6510/ Power amplifier
KIA431 tect TA8410AK (TL+/, BL+/)
control IC707 LA6510/ Power amplifier
Microprocessor circuit TA8410AK (TR+/, BR+/)
IC211 M62393P D/A converter IC708 TMC3000NF Terrestrial magnetic sensor
IC301 741Z610-10 Main microprocessor
IC302 M51951BSL Power voltage watcher
IC303 24C08 E2PROM
Note: Specifications of Main microprocessor and Sub microprocessor are on next page.
- 17 -
justmanuals.com
Main microprocessor specifications
Pin Name Function Pin Name Function
1 H-LIN2 H-LIN2 switching signal output 64 Avref. 5V Vcc
2 H-LIN1 H-LIN1 switching signal output 63 AVDD 5V Vcc
3 DRIVE DRIVE switching signal output 62 EP-SDA E2PROM DATA terminal
4 SW BNC/D-SUB switching signal 61 EP-SCL E2PROM CLOCK terminal
5 S.O.G. S.O.G. 60 CS6 Cushion-S switching signal 6
6 GND GND 59 CS5 Cushion-S switching signal 5
7 N.C. N.C. 58 CS4 Cushion-S switching signal 4
8 N.C. N.C. 57 CS3 Cushion-S switching signal 3
9 N.C. N.C. 56 CS2 Cushion-S switching signal 2
10 500KHz CLOCK signal output for 1884 counter 55 CS1 Cushion-S switching signal 1
11 84-SDA 1884 DATA input/output terminal 54 GND GND
12 84-SCL 1884 CLOCK terminal 53 GND GND
13 GND GND 52 GND GND
14 GND GND 51 GND GND
15 GND GND 50 X1 X'TAL 8MHz
16 GND GND 49 X2 X'TAL 8MHz
17 Vss GND 48 VDD 5V Vcc
18 + KEY Front-key signal input terminal 47 RxD Automatic adjustment DATA output terminal
19 GND GND 46 TxD Automatic adjustment CLOCK terminal
20 GND GND 45 DIAG Automatic adjustment DATA input terminal
21 GND GND 44 V-SYNC IIC-BUS reference signal input terminal
22 GND GND 43 RESET Main microprocessor RESET signal input terminal
23 GND GND 42 GND GND
24 KEY Front-key signal input terminal 41 S.O.G. S.O.G.
25 MENU Front-key signal input terminal 40 D/A-SCL D/A CLOCK output terminal
26 GND GND 39 OSD-CS OSD SELECT signal output terminal
27 CLAMP CLAMP 38 OSD-SCL OSD CLOCK input/output terminal
28 DEG Degauss control signal output 37 SUB-SCL Sub E2PROM CLOCK terminal
29 PS1 POWER-SAVE control signal output 1 36 SUB-SDA Sub E2PROM DATA input terminal
30 LED-O LED control signal output (Orange) 35 SUB-SDA Sub E2PROM DATA output terminal
31 LED-G LED control signal output (Green) 34 Pre-SCL Pre-Amp CLOCK output terminal
32 Vss GND 33 Pre-SDA Pre/OSD/DA-DATA output terminal
- 18 -
Sub microprocessor specifications
Pin Name Function Pin Name Function
1 DA-SDA D/A DATA input/output terminal 28 5V 5V Vcc
2 DA-SCL D/A CLOCK output terminal 27 N.C. N.C.
3 N.C. N.C. 26 ON-TIME POWER-ON time detection
4 N.C. N.C. 25 Temp. Temperature detection
5 GND GND 24 N.C. N.C.
6 RESET Sub microprocessor RESET signal input 23 AD-Vref A/D reference voltage 5V
7 X0 t e r m i n a l 22 GND GND
8 X1 X'TAL 4MHz 21 GND GND
9 GND X'TAL 4MHz 20 GND GND
10 N.C. GND 19 X Magnetism sensor detection
11 M-SDA N.C. 18 Y Magnetism sensor detection
2
12 M-SDA Main E PROM DATA output terminal 17 N.C. N.C.
2
13 M-SCL Main E PROM DATA input terminal 16 N.C. N.C.
2
14 N.C. Main E PROM CLOCK terminal 15 N.C. N.C.
N.C.
- 19 -
justmanuals.com
4. CIRCUIT DESCRIPTION
4-1. POWER FACTOR circuit
Q The full-wave rectified voltage waveform from D942 and smoothed voltage waveform from C926 are multiplied and
compared to R the voltage waveform from current detect resistor R925 of Q934. Q934 is turned off when R
exceeds Q, and is turned on when R is 0V. The above repetition is to change input current to substantially
sinusoidal waveform and it corrects harmonic distortion. The switching frequency is not constant as Q934 is turned
on or off by monitoring input voltage and load current. Therefore, this circuit is not synchronized with the MAIN
POWER circuit.
Switching frequency is minimum when input voltage is low and load current is maximum, in other words, the
switching frequency is maximum when input voltage is high and load current is minimum. (Switching frequency is
approx. 20-250kHz)
This circuit is operated by the voltage supplied to IC932 from the SUB POWER circuit so that it is not activated at
power management state.
0V
D942
T932 D943
AC +400V
90-132/ C926
198-264V R926
IC932 R927 DC
To pin 1
5 7 Q934 of IC932
0V
R928
0V
R925
POWER FACTOR circuit
- 20 -
4-2. MAIN POWER circuit
400V is supplied to this circuit from the POWER FACTOR circuit. This circuit is fly-back type circuit which includes
IC930 controls PWM (Pulse Width Modulation) CONTROL circuit. The T930 secondary provides the following DC
voltages:
Q 80V line: Supplied to the DBF (Dynamic Beam Focus), HIGH VOLTAGE OUTPUT CONTROL,
and the CUT-OFF CONTROL circuits and the VIDEO OUTPUT IC as power source.
R 28.5V line: Supplied to the HORIZONTAL DEFLECTION OUTPUT (Variable B voltage control) and the
HORIZONTAL DRIVE circuits as power source.
S 16V line: Supplied to the VERTICAL DEFLECTION OUTPUT circuit as power source.
Divided 16V line is regulated to 12V by IC960 and supplied to the HORIZONTAL DEFLECTION
OUTPUT and HIGH VOLTAGE OUTPUT CONTROL and VIDEO SIGNAL PROCESSING circuits,
regulated to 12V by IC351 and supplied to the CONTROL SYSTEM circuit, regulated to
12V by IC702 and supplied to the CRT CORRECTION circuit and TERRESTRIAL MAGNETIC
SENSOR (IC708), regulated to 5V by IC709 and supplied to SUB MICROPROCESSOR
(IC701), D/A CONVERTER (IC703) and TEMPERATURE SENSOR as power source.
T 12V line: Supplied to the VERTICAL DEFLECTION OUTPUT and the CRT CORRECTION circuits as
power source.
U B9 voltage: The 28.5V line is pressured up to B9 voltage by the PWM CONTROL circuit which includes
(35-155V) IC961 and Q962. The voltage from the D973 cathode is supplied to the HORIZONTAL
DEFLECTION OUTPUT and the HIGH VOLTAGE OUTPUT circuits as power source.
This circuit is controlled by the voltage supplied from the SUB POWER circuit and it is not activated at power
management state. Therefore, no secondary provides the DC voltages.
D942
POWER FACTOR
T930
AC circuit 1 80V
90-132/ L961 D973
198-264V 5 B9 (35-155V)
2 28.5V
IC961
6 Q962
R966
IC930
6 Q930 IC702 12V
3 16V
R932
IC709 5V
4 12V
IC960 12V
IC351 12V
16V
- 21 -
justmanuals.com
4-3. SUB POWER circuit
IC931 included in this circuit consists of the POWER MOS-FET and the CONTROL circuits and modulates the
pulse width. The current fed back from pin 9 of T931 is input to the control terminal of IC931. The T931 primary
provides the DC voltage (approx. 20V) to the POWER FACTOR and the MAIN POWER circuits as power source.
The T931 secondary provides the DC voltage (approx. 8.5V). Divided 8.5V line is regulated to 5V by IC304 and
supplied to the MAIN MICROPROCESSOR (IC301), IC350, VIDEO SIGNAL SWITCHING (IC101), DDC (IC102)
and TEMPERATURE SENSOR, regulated to 6.3V by IC206 and supplied to the CRT heater voltage, also regulated
to 5V by IC205 and supplied to the VIDEO AMPLIFIER (IC201), OSD CONTROL (IC203) and D/A CONVERTER
(IC211) as power source. The voltage at pin 1 of IC931 is 5.7V generally. This circuit is not synchronized with MAIN
POWER circuit as the oscillation frequency is fixed to approx. 100kHz.
T931 D964 8.5V
400V IC304 5V
5.7V
1 IC931 3 IC206 CRT heater
20V IC205 5V
To
POWER FACTOR and
MAIN POWER circuits
4-4. PROTECTION circuit
To prevent damage to the monitor, X-ray radiation etc., the POWER FACTOR and the MAIN POWER circuits stop
in the following cases:
+16V line: The voltage exceeds 23V.
+8.5V line: The voltage exceeds 15V.
+400V line: The voltage exceeds 460V.
Variable B voltage line: The voltage exceeds 200V.
X-ray protection circuit: The voltage exceeds 30kV.
Arc limit circuit: The beam current exceeds 2.9mA.
4-5. DISPLAY POWER MANAGEMENT circuits
(1) Stand-by / Suspend state:
When receiving no video signal and no horizontal or vertical sync signal for 6 seconds, pin 29 of IC301 turns to
5V from 0V. PC930 is turned on to stop power supply to the POWER FACTOR and the MAIN POWER circuits.
The power consumption is 10W or less.
(2) Active-off state:
When receiving no video signal and no horizontal and vertical sync signals for 6 seconds, pin 29 of IC301 turns
to 5V from 0V. Also, pin 16 of IC301 turns to 5V from 0V so that IC204 is turned on. The output from IC206 stops
and the heater voltage is turned off. The power consumption is 6W or less.
4-6. DEGAUSS circuit
As K930 is turned on when the power on, the degauss current flows through degauss coil and PR930 to degauss
the CRT. After approx. 6 seconds from power on, K930 is turned off automatically. As for manual degauss by the
adjustment item of Degauss, the degauss is performed in the same way.
- 22 -
4-7. SIGNAL PROCESSING circuit
Input signal from D-SUB or BNC connector is converted to the waveform by IC101. The input signal is applied to pin
17 of IC101 from the MAIN MICROPROCESSOR (IC301) and then switched to D-SUB when pin 17 of IC101 is
"HIGH" level (5V), or to BNC when pin 17 of IC101 is "LOW" level (0V). When only one of the two signal inputs is
connected to the signal source, the one connected is automatically selected. When both of the signal inputs are
connected to the signal source, the latest one connected just before power off is selected. The adjustment item of
Signal Select also selects D-SUB or BNC. The selected input signal is converted to the waveform by IC101. The
sync signal is input to IC350 and the video signal is input to IC201.
4-8. SYNC SIGNAL PROCESSING circuit VIDEO
SIGNAL
The input sync signal to IC350 is processed inside IC350 H/V SWITCHING
as follows: INPUT
IC101 H/V
Q Detect the input sync signal presence
R Discriminate the input sync signal type: Separate / H&V SYNCHRONOUS
Composite / Sync On Green SIGNAL PROCESSOR
S Discriminate the sync polarity: Positive / Negative H&V OSCILLATOR
T Count the frequency MAIN MICROPROCESSOR IIC-BUS IC350
IC301
500kHz clock signal supplied to pin 29 of IC350
counts the frequency. The frequency is sent to the
MAIN MICROPROCESSOR (IC301) to store Q- 500kHz
T in the E 2PROM as a read data.
Pin 29 of IC350
4-9. CONTROL SYSTEM circuits
4-9-1. H-SIZE and DISTORTION CORRECTION CONTROL
The parabolic wave output from pin 9 of IC350 is adjusted and converted to the waveform by IC503 and then input to
pin 2 of IC961.
a (Approx. 8V): DC bias....H-size control
b (Approx. 1Vp-p): AC amplitude....Distortion control
b
a
0V
Pin 9 of IC350
The parabolic wave input to pin 2 of IC961 is added to the PWM waveform from pin 6 of IC961. The V-parabolic wave
modulates the variable B voltage to perform distortion correction.
c c: H-size adjustment level
0V
Variable B voltage waveform
(D973 cathode)
-