Iiyama Vision Master Pro 450 User manual

SERVICE MANUAL
September 22, 1998
A901HT
710-1 Kitaowaribe, Nagano-shi 381-0014 JAPAN
IIYAMA ELECTRIC CO., LTD.
opyright
NO. S1998E01

[ Revision Record ]
Rev. Section ontents
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2. TIMING HART..............................................................................................
3. I APPLI ATION...........................................................................................
1. SET-UP ADJUSTMENTS...............................................................................
SAFETY PRE AUTION.............................................................................
5. SERVI E PARTS LIST...................................................................................
6. EXPLODED VIEW.........................................................................................
4. IR UIT DES RIPTION.................................................................................
7. DIAGRAMS...................................................................................................
CONTENTS
Page
54-61
62-64
1-15
16
17-19
20-27
28-53
i-ii
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.
<Required measuring equipment>
<Preparation>
Signal generator (Programmable video generator)........................ Leader 1604A
D voltmeter (300V D range)
Note: Digital multimeter can also be used.
High voltage probe (0-30kV D )
olor analyzer.......................................................................... Minolta A-100
Photometer............................................................................. Minolta LS-100
Electric field meter.................................................................... ombinova 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)
Place the monitor without tilting.
onnect the signal cable from the signal generator to the monitor.
Face the RT screen to east so as not to be influenced by magnetic force.
1.
2.
3.
4.
5.
6.
7.
- 1 -
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 hapter 2.
R
16.108
15.439
12.711
12.696
15.115
10.472
5.781
10.171
Q
1.007
0.771
1.112
3.636
0.420
0.582
0.416
0.455
O
17.719
16.652
14.268
16.665
16.695
11.108
6.249
10.660
D
30.39
27.94
25.422
26.96
15.76
6.41
6.38
6.22
S
0.282
0.368
0.381
0.272
1.076
0.027
0.026
0.009
P
0.322
0.074
0.064
0.061
0.084
0.027
0.026
0.025
E
2.85
2.20
0.636
0.34
0.88
0.40
0.27
0.25
Vertical (msec)
Horizontal (µsec)
3.99
2.21
1.907
0.99
2.36
1.48
1.14
1.13
B
3.04
4.41
3.813
2.01
2.00
0.80
0.89
0.87
A
40.27
36.76
31.778
30.30
21.00
9.09
8.68
8.47
V
N
N
P
N
N
P
P
P
Sync polarity
H
N
N
N
N
N
P
P
P
Resolution*
640×400
608×420
640×400
712×419
1024×720
384×1152
400×666
400×1200
omp
–
–
–
–
O
–
–
–
Sync
on
green
–
–
–
–
O
–
–
–
fH
(kHz)
24.8
27.3
31.5
33.0
47.6
110.0
115.0
118.0
*The resolutions are only for your reference when using Leader 1604A.
Turn ON the Power Switch, and degauss the entire screen with degausser. è See "EXTERNAL DEGAUSS".
Perform adjustment by setting the brightness to center and the contrast to maximum, except where
specifically indicated.
Receive MODE 5 and turn ON the Power Switch. Perform adjustment after a warm-up of at least an
hour.
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.
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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. onnect 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.
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.
The menu items in the Factory Mode are as follows:
Trapezoid
Parallelogram
Side-pin-balance
Side-pin-corner
ushion-side
DEGAUSS
Uniform-V ENT
N-S RR
DBF-Para
DBF-Phase
H-moire
H-convergence
V-convergence
Tilt-dy
ontrast
Brightness
V-size
V-position
H-size
H-position
Pin-cushion
Uniform-V-TB
Uniform-H ENT
Uniform-H-RL
Landing-TL
Landing-TR
Landing-BL
Landing-BR
- 2 -
RS connector
CRT
CRT face
PWB-MAIN
ADJ.MODE E2PROM
S1
PWB-RS
Short-connector
V-linear-S
V-linear-
Auto-da-test1
Auto-da-test2
Auto-da-test3 *
RT heck
DF DP
*Auto-da-test3 helps you to perform H/V-BLANKING and H/V- ONVERGEN E 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 RR è 4. Landing-TL/TR/BL/BR è 5. H/V-blanking

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.
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
A
B
Menu * / Adjustment item available
Menu 1
Menu 1, 3, 5
ontrast, Brightness
PROCEDURE
* It shows the number of the standard menu page.
- 3 -
EXTERNAL DEGAUSS
Make sure you disable the Landing-TL/TR/BL/BR and N-S RR settings before performing the external degauss.
Follow the procedure below depending on the adjustment mode you are in.
USER MODE
1) Select Degauss and press the MENU Button so that the Landing-TL/TR/BL/BR and N-S RR will be
disabled.
2) Degauss the entire screen with degausser while the Degauss is activated (approx. 6 seconds).
FACTORY MODE
1) Select RT heck and press the MENU Button so that the Landing-TL/TR/BL/BR and N-S RR will
be disabled.
2) onfirm 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.
PROCEDURE
n
o
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- 4 -
Note: S REEN VR should not be turned after the adjustment above.
1-2. ANODE VOLTAGE adjustm nt [PWB-MAIN]
1-3. SCREEN VOLTAGE adjustm nt [PWB-MAIN]
1)
2)
3)
Receive a cross-hatch inverted signal of MODE 5 when applying the A
voltage of 110±10V.
onnect the D voltmeter between ONNE TOR TP and GND (chassis).
Adjust the voltage to D 80±0.5V with VR930 (+B ADJ).
1-1. 80V-ADJ adjustm nt [PWB-MAIN]
1)
2)
3)
4)
Receive a cross-hatch inverted signal of MODE 5.
Turn ON the Power Switch.
onnect a high-voltage probe between LEAD- ONNE TOR S on the
PWB-MAIN / ONNE TOR S on the PWB-VIDEO and GND (chassis).
Adjust the screen voltage to 630±10V with S REEN VR located lower of
T501 (FBT).
1)
2)
3)
4)
5)
6)
7)
Receive a cross-hatch inverted signal of MODE 5.
Turn OFF the Power Switch.
onnect a high-voltage probe between RT anode and GND (chassis).
Turn ON the Power Switch.
Adjust the high-voltage to 27.0±0.1kV with VR501 (HV-ADJ).
onfirm the variation of high-voltage is within ±0.2kV when receiving MODE
1 and MODE 6 respectively.
Turn OFF the Power Switch and remove the high-voltage probe.
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.
Voltage
VR930 +B ADJ
Voltage
VR501 HV-ADJ
Voltage
S
C
R
E
E
N
T501(FBT)

- 5 -
1-4. POWER FACTOR CIRCUIT confirmation [PWB-MAIN]
1)
2)
3)
4)
5)
6)
Receive a cross-hatch inverted signal of MODE 5.
Turn OFF the Power Switch.
onnect the D voltmeter between TP4 and TP0.
Turn ON the Power Switch.
onfirm that the voltage is D 400±10V.
Remove the D voltmeter.
1-6. FREE-RUNNING adjustm nt
1)
2)
Receive a cross-hatch inverted signals of fH 27.3kHz and 115.0kHz
respectively.
onfirm that FREE-RUNNING adjustment is automatically performed.
1-7. FH-LIMITER confirmation
1)
2)
3)
4)
5)
6)
7)
Receive a cross-hatch inverted signal of fH 24.8kHz.
onfirm that the picture disappears. Also, make sure the horizontal
oscillation frequency is within the specified range: 55-70kHz.
Receive fH 27.3kHz and confirm that the picture is synchronized.
Receive fH 118.0kHz and confirm that the picture disappears. Also, make
sure the horizontal oscillation frequency is within the specified range above.
Receive fH 115.0kHz and confirm that the picture is synchronized.
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.
Remove the frequency counter.
1-8. H-SIZE LIMIT adjustm nt
1)
2)
Receive a cross-hatch inverted signals of fH 33.0kHz and 110.0kHz
respectively.
Adjust the horizontal size (H-size) to make it full-scan.
n
n
n
1-5. TEMPERATURE SENSOR confirmation
1)
2)
3)
Receive a cross-hatch inverted signal of MODE 5.
Select RT heck and press the MENU Button.
onfirm that respective temperature of fan and monitor front displayed
on the screen is as follows: actual temperature ±5° .
n

|||||···· ····
30 ···········
30
CRT Check
Fan Monitor front
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1-11. V-LIN adjustm nt
1)
2)
3)
4)
Receive a cross-hatch inverted signal of MODE 5.
Adjust the vertical size so that the size is 270±4mm.
Adjust the vertical linear corner (V-linear- ), so that difference between A
and B of the right hand side figure is as follows: | A–B | </= 0.5mm
Adjust the vertical linear side (V-linear-S), so that A, B and are almost
equal.
A
C
B
1-10. V-BLANKING confirmation
Picture Picture
Raster rolling Raster tearing
1)
2)
3)
4)
5)
Receive a cross-hatch inverted signal of MODE 5.
Adjust the vertical size and position (V-size and V-position) of the picture
roughly with the front buttons.
Select Auto-da-test3 and press the MENU Button so that the automatic
confirmation program starts.
onfirm that the back-raster is not rolling or tearing at the top.
onfirm that no retrace line is over the picture.
1-12. H-CENT adjustm nt [PWB-MAIN]
1)
2)
3)
4)
5)
Receive a cross-hatch inverted signal of MODE 5.
Adjust the horizontal size and position of the picture roughly with the front
buttons.
Maximize the brightness so that the back-raster appears on the screen.
Set S501 to the right, center or left so that A and B in the right hand side
figure are almost equal.
Return the brightness to center indication.
- 6 -
1-13. TILT-DY adjustm nt
1)
2)
Receive a cross-hatch inverted signal of MODE 5.
Adjust the tilt deflection yoke (Tilt-dy) with the +/– Buttons so that X of the
right hand side figure is as follows: | X | </= 0.5mm.
X
n
n
n
n
Picture
Bezel
AB
Back-raster
Right Left
S501
1-9. H-BLANKING confirmation
1)
2)
3)
4)
5)
Receive a cross-hatch inverted signal of MODE 5.
Minimize the horizontal size (H-size) with the front buttons.
Select Auto-da-test3 and press the MENU Button so that the automatic
confirmation program starts.
onfirm that X of the right hand side figure is as follows: X </= 3.0mm.
Adjust the horizontal size roughly with the front buttons.
n
Picture
Raster rolling
x

- 7 -
1-14. PICTURE SIZE, POSITION AND DISTORTION adjustm nt (Crit ria)
1)
2)
3)
Receive a cross-hatch inverted signal of MODE 4.
Adjust the picture size and position to the specified setting below.
orrect the side distortion with the front buttons so that X of the right hand
side figure is as follows: | X | </= 0.5mm/30mm when selecting the most
remarkable distortion with the naked eye.
H-size: 360±4mm
V-size: 270±4mm
H-position: | A–B |<4mm
V-position: | –D |<4mm
1-15. PICTURE SIZE, POSITION AND DISTORTION adjustm nt
1)
2)
3)
4)
5)
Receive a cross-hatch inverted signal of fH 31.5kHz.
Adjust the picture size, position and distortion roughly with the front buttons
to the reference settings below.
Note: The picture should be within the bezel.
Receive a cross-hatch inverted signal of all preset modes respectively.
Adjust the picture size and position to the specified setting below.
orrect the Pin-cushion and Trapezoid distortion with the front buttons so
that X of the right hand side figure is as follows: | X | </= 0.5 mm/30mm
when selecting the most remarkable distortion with the naked eye.
H-size: 360±4mm
V-size: 270±4mm
H-position: | A–B |<4mm
V-position: | –D |<4mm
Bezel
AB
C
D
Picture
Pin-cushion
Trapezoid
Side-pin-balance
Parallelogram
Side-pin-corner
ushion-side
Note: No other adjustment items for distortion than the above should be
adjusted.
1-16. RESET confirmation
1)
2)
3)
4)
Receive a cross-hatch inverted signal of MODE 5.
hange the horizontal position (H-Position) roughly with the front buttons.
Perform Reset.
onfirm that the adjustment data above is reset to the factory setting.
n
n
H-size: 360±10mm
V-size: 270±10mm
H-position: | A–B |<8mm
V-position: | –D |<8mm
o
| X | </= 1.0mm/30mm when selecting the most remarkable
distortion with the naked eye.
30mm
X
Picture
Pin-cushion
Trapezoid
Parallelogram
Cushion-side
Side-pin-balance
Side-pin-corner
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