Iiyama Vision Master Pro 451 User manual

Contents
SERVICE MANUAL
A902MT
1. SET-UP ADJUSTMENTS
2. TIMING CHART
3. IC APPLICATION
4. CIRCUIT DESCRIPTION
5. SERVICE PARTS LIST
6. EXPLODED VIEW
7. DIAGRAMS

SERVICE MANUAL
September 8, 2000
710-1 Kitaowaribe, Nagano-shi 381-0014 JAPAN
IIYAMA CORPORATION
Cop right
NO. S1900E01
A902MT

[ Revision Record ]
Rev. Section Contents

2. TIMING CHART..............................................................................................
3. IC APPLICATION...........................................................................................
1. SET-UP ADJUSTMENTS...............................................................................
SAFETY PRECAUTION.............................................................................
5. SERVICE PARTS LIST...................................................................................
6. EXPLODED VIEW.........................................................................................
4. CIRCUIT DESCRIPTION.................................................................................
7. DIAGRAMS...................................................................................................
CONTENTS
Page
57-65
66-68
1-16
17
18-19
20-32
33-56
i-ii
NOTICE
The information in this document is subject to change without notice.

SAFET PRECAUTION
1. The design of this product contains special hardware, man circuits and components speciall for safet purposes.
For continued protection, no changes should be made to the original design unless authorized in writing b the
manufacturer. Replacement parts must be identical to those used in the original circuits. Service should be
performed b qualified personnel onl .
i
Alterations of the design or circuitr of the products should not be made. An design alterations or additions will
void the manufacturer's warrant and will further relieve the manufacturer of responsibilit for personal injur or
propert damage resulting therefrom.
2.
3. Man electrical and mechanical parts in the products have special safet -related characteristics. These
characteristics are often not evident from visual inspection nor can the protection afforded b them necessaril
be obtained b using replacement components rated for higher voltage, wattage, etc. Replacement parts which
have these special safet characteristics are identified in the parts list of Service manual. Electrical components
having such features are identified b mark “#” on the schematics and “!” on the parts list in Service manual. The
use of a substitute replacement which does not have the same safet characteristics as the recommended
replacement part shown in the parts list of Service manual ma create shock, fire, or other hazards.
Use isolation transformer.
The chassis and an sub-chassis contained in some products are connected to the primar circuit of the AC
power line. An isolation transformer of adequate capacit should be inserted between the product and the AC
power suppl point while performing an service on some products when the primar circuit of the AC power
suppl is exposed.
4.
The high voltage applied to the picture tube must conform with that specified in Service manual. Excessive high
voltage conditions should be kept to a minimum, or should be prevented. If severe arcing occurs, remove the AC
power immediatel and determine the cause b visual inspection (incorrect installation, cracked or melted high
voltage harness, poor soldering, etc.) To maintain the proper minimum level of soft X-ra emission, components
in the high voltage circuitr including the picture tube must be the exact replacements or alternatives approved
b the manufacturer of the complete product.
5.
Isolation Check
(Safet for Electrical Shock Hazard)
After reassembling the product alwa s perform an isolation check on the exposed metal parts of the cabinet
(video input and output terminals, control knobs, screwheads, control shafts, etc.) to be sure the product is safe
to operate without danger of electrical shock.
6.
Dielectric Strength Test
The isolation between the AC primar circuit and all metal parts exposed to the user, particularl an exposed
metal part having a return path to the chassis should withstand a voltage of 1,500V AC(r.m.s.), 20mA(current
sensitivit ) for a period of one minute.
This method of test requires a test equipment not generall found in the service trade.
1)
Leakage Current Check
Plug the AC line cord directl into the AC outlet (do not use a line isolation transformer during this check.).
Using a “Leakage Current Tester”, measure the leakage current from each exposed metal part of the cabinet,
particularl an exposed metal part having a return path to the chassis, to a known good earth ground (water
pipe etc.). An leakage current must not exceed 3.5mA AC(r.m.s.).
2)

GOOD EARTH GROUND
PLACE THIS PROBE ON
EACH EXPOSED METAL
PART
AC VOLTMETER
(HAVING 1,000Ω/V OR MORE SENSITIVITY)
Alternate Check Method
Plug the AC line cord directl into the AC outlet (do not use a line isolation transformer during this check.). Use an
AC voltmeter having 1,000 ohms per volt or more sensitivit in the following manner. Connect a 1,500Ω 10W resistor
paralleled b a 0.15uF AC-t pe capacitor between an exposed metal part and a known good earth ground (water
pipe etc.).
Measure the AC voltage across the resistor with the AC voltmeter. Move the resistor connection to each exposed
metal part, particularl an exposed metal part having a return path to the chassis, and measure the AC voltage
across the resistor. Now, reverse the plug in the AC outlet and repeat each measurement. An voltage measured
must not exceed 2.45V AC(r.m.s.). This corresponds to 3.5mA AC(r.m.s.).
0.15uF AC-TYPE
1,500Ω 10W
ii

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
DC voltmeter (300V DC range)
Note: Digital multimeter can also be used.
High voltage probe (0-30kV DC)
Color anal zer.......................................................................... 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.)
Frequenc counter
Digital wattage meter
Landing meter.............................................................................. LSS LND-070 or 072
Degausser
Headphones
CD pla er
Audio-LR confirmation equipment
USB compliant computer
Interface adapter (Ii ama handmade)
Short-connector (Ii ama handmade)
Place the monitor without tilting.
Connect the signal cable from the signal generator to the monitor.
Face the CRT screen to east so as not to be influenced b magnetic force.
1.
2.
3.
4.
5.
6.
7.
- 1 -
Note: This monitor should be checked and adjusted b connecting it to a signal generator, then entering
and running the timing charts both below and of Chapter 2.
R
13.704
19.416
15.115
4.442
10.171
Q
0.444
0.455
0.420
0.508
0.455
O
14.285
20.000
16.695
5.000
10.660
D
27.40
25.68
15.76
9.40
6.22
S
0.034
0.032
1.076
0.012
0.009
P
0.103
0.097
0.084
0.038
0.025
E
0.69
0.77
0.88
0.59
0.25
Vertical (msec)
Horizontal (µsec)
C
3.43
3.34
2.36
1.64
1.13
B
2.74
2.57
2.00
1.06
0.87
A
34.26
32.36
21.00
12.69
8.47
V
P
P
N
P
P
S nc polarit
H
P
P
N
P
P
Resolution*
640×400
800×600
1024×720
320×350
400×1200
Comp
–
–
O
–
–
S nc
on
green
–
–
O
–
–
fH
(kHz)
29.2
30.9
47.6
77.8
118.0
*The resolutions are onl for our reference when using Leader 1604A.
Turn ON the Power Switch, and degauss the entire screen with degausser. è See "EXTERNAL DEGAUSS".
Perform adjustment b setting the brightness to center and the contrast to maximum, except where
specificall indicated.
Receive MODE 5 and turn ON the Power Switch. Perform adjustment after a warm-up of at least an
hour.
Adjustment data is automaticall saved in the memor when the on screen displa disappears, when
another signal is received.

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 onl available under User Mode. The adjustments with ‘n’ in front of the title are onl available under
Factor Mode. You can perform the other adjustments b either User or Factor Mode. Please change the mode
as required.
USER MODE:
Turn ON the Power Switch and ou are in the User Mode.
FACTORY MODE: There are two wa s to enter the Factor Mode.
1. Turn OFF the Power Switch. Short between pins 2 and 4 of RS connector on the PWB-MAIN with
a short-connector. Turn ON the Power Switch and ou are in the Factor Mode. The following Factor
Mode Menu appears on the screen when ou press the MENU Button. Turn OFF the Power Switch and
remove the short-connector from RS connector to exit.
2. In the adjustment menu, select "Function" on the Main Menu and then select "Language" on the Sub-Menu.
Follow the flow chart below and ou are in the Factor Mode. Turn OFF the Power Switch to exit.
The menu items in the Factor Mode are as follows:
Pincushion
Trapezoid
Parallelogram
Pinbalance
Sidepin Top
Sidepin Bottom
Contrast
Brightness
V-size
V-position
-size
-position
Pinbalance Top
Pinbalance Btm
DBF Para
DBF Phase
V DBF
moire
- 2 -
*DA TEST 3 helps ou to perform H/V-BLANKING and H-CONVERGENCE / TILT-DY confirmations in
this SET-UP ADJUSTMENTS. The following items are displa ed automaticall in turn.
1. H-convergence è 2. Tilt-d è 3. H/V-blanking
RS
connector
CRT
ê
CRT face
PWB-MAIN
V moire
convergence
Tilt-Dy
V linear side
V linear corner
Red gain
RS
Connector e.g. : Color Analyzer
short
PWB-MAIN side
Temp cont
Blue gain
rrc
V-conver
Bottom-right
Top-right
Top-left
Bottom-left
CRT check
DA TEST 1
DA TEST 2
DA TEST 3 *
DP DH VD
V
S
V
CRG
CT
BG
T1 T2 T3
F
f
RG
B

- 3 -
EXTERNAL DEGAUSS
Make sure ou disable the Bottom-right, Top-right, Top-left, Bottom-left, and rrc settings before performing the
external degauss. Follow the procedure below depending on the adjustment mode ou are in.
USER MODE
1) Select Degauss and press the MENU Button so that the Bottom-right, Top-right, Top-left, Bottom-left,
and rrc will be disabled.
2) Degauss the entire screen with degausser while the Degauss is activated (approx. 6 seconds).
FACTORY MODE
1) Select CRT Check and press the MENU Button so that the Bottom-right, Top-right, Top-left, Bottom-left,
and rrc will be disabled.
2) Confirm that the OSD sta s displa ed on the screen.
Note: If the OSD disappears, restart from 1).
3) Degauss the entire screen with degausser.
PROCEDURE
n
o

- 4 -
Note: SCREEN 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 1 when appl ing the AC
voltage of 110±10V.
Connect the DC voltmeter between CONNECTOR TP and GND (chassis).
Adjust the voltage to DC 80±0.5V with VR951 (80V-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.
Connect a high-voltage probe between LEAD-CONNECTOR SC on the
PWB-MAIN / CONNECTOR SC on the PWB-VIDEO and GND (chassis).
Adjust the screen voltage to 630±10V with SCREEN 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.
Connect a high-voltage probe between CRT anode and GND (chassis).
Turn ON the Power Switch.
Adjust the high-voltage to 25.0±0.1kV with VR501 (HV-ADJ).
Confirm the variation of high-voltage is within ±0.2kV when receiving MODE
1 and MODE 6 respectivel .
Turn OFF the Power Switch and remove the high-voltage probe.
WARNING !
VR501 (HV-ADJ) has been carefull factor -adjusted for each unit in order
to satisf regulations regarding X-radiation.
Further adjustment on VR501 shall not be performed.
In case of adjustment, the adjusted position of VR501 must be fixed b a
soldering iron to prevent it from rotating.
Voltage
VR951 80V-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.
Connect the DC voltmeter between TP4 and TP0.
Turn ON the Power Switch.
Confirm that the voltage is DC 400±10V.
Remove the DC voltmeter.
1-6. FH-LIMITER confirmation
1)
2)
3)
4)
5)
6)
7)
Receive a cross-hatch inverted signal of fH 29.2kHz.
Confirm that the picture disappears. Also, make sure the horizontal
oscillation frequenc is within the specified range: 58-62kHz.
Receive fH 30.9kHz and confirm that the picture is s nchronized.
Receive fH 118.0kHz and confirm that the picture disappears. Also, make
sure the horizontal oscillation frequenc is within the specified range above.
Receive fH 77.8kHz and confirm that the picture is s nchronized.
Turn OFF the power of signal generator and confirm that the picture
disappears. Also make sure the horizontal oscillation frequenc is within
the specified range above.
Remove the frequenc counter.
n
1-7. 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 DA TEST 3 and press the MENU Button so that the automatic
confirmation program starts.
Confirm that X of the right hand side figure is as follows: X </= 3.0mm.
Adjust the horizontal size roughl with the front buttons.
n
Picture
Raster rolling
x
1-5. TEMPERATURE SENSOR confirmation
1)
2)
3)
Receive a cross-hatch inverted signal of MODE 5.
Select CRT Check and press the MENU Button.
Confirm that respective temperature of CRT fannel and monitor front
displa ed on the screen is as follows: actual temperature ±5°C.
n
35
30
CRT Check CRT
fannel
Monitor
front
****

1-9. 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 corner), 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 side), so that A, B and C are almost
equal.
A
C
B
1-8. 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
roughl with the front buttons.
Select DA TEST 3 and press the MENU Button so that the automatic
confirmation program starts.
Confirm that the back-raster is not rolling or tearing at the top.
Confirm that no retrace line is over the picture.
1-10. 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 roughl 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 -
1-11. TILT-DY adjustm nt
1)
2)
Receive a cross-hatch inverted signal of MODE 5.
Adjust the tilt deflection oke (Tilt-D ) 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

- 7 -
1-12. 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.
Correct 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 e e.
H-size: 360±10mm
V-size: 270±10mm
H-position: | A–B |<8mm
V-position: | C–D |<8mm
1-13. 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 roughl 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 respectivel .
Adjust the picture size and position to the specified setting below.
Correct the Pincushion 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 e e.
H-size: 360±10mm
V-size: 270±10mm
H-position: | A–B |<8mm
V-position: | C–D |<8mm
Bezel
AB
C
D
Picture
Pincushion
Trapezoid
Pinbalance
Parallelogram
Sidepin Top / Bottom
Pinbalance Top / Bottom
Note: No other adjustment items for distortion than the above should be
adjusted.
1-14. RESET confirmation
1)
2)
3)
4)
Receive a cross-hatch inverted signal of MODE 5.
Change the horizontal position (H-position) roughl with the front buttons.
Perform Reset.
Confirm that the adjustment data above is reset to the factor setting.
n
n
H-size: 360±10mm
V-size: 270±10mm
H-position: | A–B |<8mm
V-position: | C–D |<8mm
o
| X | </= 1.0mm/30mm when selecting the most remarkable
distortion with the naked e e.
30mm
X
Picture
Pincushion
Trapezoid
Parallelogram
Side pin Top / Bottom
Pinbalance
Side pin Top / Bottom
XX
XX
Pinbalance Top / Bottom

Be sure to enter the Factor Mode b using the short-connector.
Connect the interface adapter from RS-232C of the color anal zer to the
PWB-RS of the short-connector.
Select VIDEO IN 2 for the signal input and receive a white window signal
of MODE 4.
Turn OFF the R, G and B outputs on the signal generator.
Appl a color anal zer probe to the center of the screen.
Turn ON the Remote Switch of the color anal zer so that the automatic
CUT-OFF adjustment starts.
Turn ON the R, G and B outputs on the signal generator so that the
COLOR TEMPERATURE and CONTRAST LIMIT adjustments start
automaticall .
<COLOR TEMPERATURE>
The X and Y specified readings of the color anal zer are as follows:
<CONTRAST>
The specified contrast range is 120±6cd/m2.
Note: In case that the contrast is not within the specified range above,
repeat 4) to 7).
The OSD disappears.
Press the MENU Button so that the OSD appears.
All adjustment data is stored when the OSD disappears.
Turn OFF the Remote Switch of the color anal zer.
CT 1 (9300K)
X: 0.283±0.008
Y: 0.297±0.008
1
0
B. P. S. DIP switch
1-15. Automatic COLOR adjustm nts
WARNING:
- 8 -
Do not change the horizontal and vertical s nc signal or the frequenc
while the automatic COLOR adjustments are underwa .
Color analyzer setting:
Luminance unit switch: cd/m2
B.P.S. DIP switch: 9600 (1000)
Turn ON the color anal zer switch and press 0-CAL switch before use.
1)
2)
3)
4)
5)
6)
7)
l
l
l
cd/m² fL
Luminance unit switch
Note: The adjustments above can be repeated b turning OFF and ON the
Power Switch.
n
1)
2)
Receive a 16-gradation gra scale signal of MODE 4.
Make sure the 15th gradation on the gra scale is barel visible when the
16th gradation (back raster) is not visible at all.
1-16. GRAY SCALE confirmationn
8)
9)
10)
11)

1-21. H-CONVERGENCE confirmation
1)
2)
3)
Receive a cross-hatch inverted signal of MODE 5.
Select H-convergence or DA TEST 2, and press the MENU Button so that
the automatic confirmation program starts.
Confirm that the horizontal line is diverged.
n
- 9 -
1-17. BRIGHTNESS adjustm nt [PWB-MAIN]
1)
2)
3)
Receive an entire white raster signal of MODE 4.
Appl a photometer to the screen center.
Adjust VR502 (ABL-ADJ) so that photometer reads 105±5cd/m2.
1-18. SYNC SIGNAL INPUT confirmation
1)
2)
3)
Receive a cross-hatch inverted signal of fH 47.6kHz.
Select composite and s nc on green signal inputs respectivel b the
signal generator.
Confirm that the picture is displa ed normall .
1-19. SIGNAL SELECT confirmation
1)
2)
3)
4)
Receive a cross-hatch inverted signal of MODE 5.
Switch the signal input to VIDEO IN 1 and VIDEO IN 2 respectivel .
Press the Input Select Button (VIDEO 1/2) for approx. 5-6 seconds.
Confirm that the picture is displa ed normall .
n
n
Brightness
VR502 ABL-ADJ
1-20. POWER MANAGEMENT confirmation
1)
2)
3)
4)
5)
6)
7)
8)
9)
Turn OFF the Power Switch and connect a digital wattage meter.
Turn ON the Power Switch.
Receive a cross-hatch inverted signal of MODE 5.
Turn OFF the R, G and B outputs on the signal generator.
Disconnect the H/HV and V cables.
Confirm that the input wattage is 3W or less and the Power Indicator turns
to orange.
Connect the H/HV and V cables and confirm that the picture appears.
Turn OFF the Power Switch and remove the digital wattage meter.
Turn ON the Power Switch.
o
o

- 10 -
LMR
Fig.1
T Thin
M Thick
B Thin
Fig.2
Thin
Thick
Fig.3
Thick
LMR
1-24. FOCUS [PWB-MAIN]
1)
2)
3)
4)
5)
6)
7)
8)
9)
10)
Receive a green cross-hatch signal of MODE 5.
Adjust FOCUS-A VR of T501 (FBT) to make the vertical lines sharpest at
points L, M and R as shown in Fig 1.
Adjust FOCUS-B VR of the T501 to make the horizontal center line
sharpest at points L, M and R as shown in Fig. 1.
If the focus at points T and M is as shown in Fig. 2, adjust V-DBF in the
menu with the front buttons 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. (V-DBF should
not be adjusted when focus at points T and M is optimum.)
If the focus at points L and M is as shown in Fig. 3 or vice versa, adjust
DBF Para and DBF Phase in the menu with the front buttons to make the
horizontal center line have the same thickness at 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 and DBF Phase should not be adjusted
when focus at points L and M is optimum.)
Repeat 2) to 5) until the focus is optimum.
Confirm no focus variation on the entire screen.
Check the focus with red and blue respectivel .
Receive a H-character signal and repeat 7).
Repeat the FOCUS adjustments until the focus with red, green and blue
is optimum.
1-23. RASTER REGULATION (DYNAMIC) confirmation
1)
2)
3)
4)
5)
Receive an entire white signal of MODE 5.
Set the input signal b the signal generator as follows:
V-DISP-TIME: 150 V-POSI-TIME: 450
Maximize the brightness or set the signal level to 0.9Vp-p b the signal
generator.
Confirm that <W of the right hand side figure is 1.0mm or less when
turning the luminance volume on the signal generator to the maximum
and “1” respectivel .
Return the brightness to center indication.
n
n
FOCUS-A
FOCUS-B
SCREEN
T501(FBT)
Back-raster
Picture
W
1-22. V-CONVERGENCE confirmation
1)
2)
3)
Receive a cross-hatch inverted signal of MODE 5.
Select V-convergence or DA TEST 2, and press the MENU Button so that
the automatic confirmation program starts.
Confirm that the vertical line is diverged.
n

1-25. LUMINANCE DIFFERENCE adjustm nt
1)
2)
3)
4)
Receive an entire white signal of MODE 5.
Appl a photometer to C (center), L (left) and R (right) in the right hand
side figure.
Confirm that the luminance difference between C and L, C and R is within
±10cd/m2 respectivel .
If the luminance difference is not within the specified range above, adjust
VR301 (Uniform).
1-26. LUMINANCE DIFFERENCE confirmation
1)
2)
3)
Receive an entire white signal of MODE 5.
Appl a photometer to the two points where the luminance difference is
remarkable with the naked e e.
Confirm that the luminance difference is 22.5cd/m2 or less.
C
TL TR
BRBL B
T
R
L
- 11 -
CR L
n
Luminance
VR301 Uniform

1) Connect cables according to the user manual.
2) Turn ON the Power Switch of the monitor and computer.
3) Double-click “Universal serial bus controller” as shown in Fig 1 on next page.
4) Confirm that “Generic USB Hub” or “Ii ama USB Hub” appears as shown in Fig 2.
5) Disconnect the USB Cable from the USB compliant computer.
6) Double-click “Universal serial bus controller”.
7) Confirm that “Generic USB Hub” or “Ii ama USB Hub” disappears as shown in Fig 3.
8) Connect the USB Cable to the stand.
9) Repeat 1) to 5) and confirm that the USB function works normall .
1-28. USB Op ration Ch ck
1-27. AUDIO confirmation
1) Turn the Volume Control from 0% to 100% and make sure the sound is normal without hum etc.
2) Set the Volume Control at mechanical center.
3) Connect the output of a CD pla er to the Audio Connector and make sure the right and left speaker
works normall .
4) Turn the Volume Control and make sure the volume varies.
5) Connect Audio-LR confirmation equipment between the Audio Connector and CD pla er.
6) Turn off left switch of the Audio-LR confirmation equipment and make sure the right speaker works
normall .
7) Turn off right switch of the Audio-LR confirmation equipment and make sure the left speaker works
normall .
8) Turn the Volume Control to 0% and connect headphones to the Headphone Connector.
9) Confirm that the Headphones don't make noise.
10) Turn the Volume Control from 0% to 100% and make sure the sound from the both headphones is well
balanced and normal without hum etc.
- 12 -

- 13 -
Fig. 2 Fig. 3
Fig. 1
Double-click
here
“Generic USB Hub” or “Ii ama USB Hub”

1-29. ITC (Int grat d Tub Compon nt) adjustm nts
The following ITC adjustments should be made onl when a new picture tube is installed, or convergence is poor.
All set-up adjustments above-mentioned must be completed before an 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 b 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.
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n
1-29-1. LANDING corr ction
1)
Degauss the entire screen with degausser. è See "EXTERNAL DEGAUSS".
Select DEGAUSS and press the MENU Button.
Receive an entire green signal.
Adjust the horizontal size to make it full-scan.
Appl the landing meter to TL (top-left), TR (top-right), BL (bottom-left) and
BR (bottom-right) in the right hand side figure.
Confirm that "H" reading of the landing meter is within ±20% at each point.
Adjust 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%.
Adjust Bottom-right, Top-right, Top-left and Bottom-left respectivel with
the front buttons so that "H" reading of the landing meter at each point is
as follows:
TL: –8 to –2% TR: +2 to +8% BL/BR: –3 to +3%
Landing meter setting:
Mode Select Switch: Monitor Normal
Note: Mode Select Switch should be set before turning on the power switch of the landing meter.
Volt: 2V
Time: 50ms
Gain: 7
Unit: % for LND-070, 0.8µm (1%=0.8µm) for LND-072
l
l
l
l
l
TL TR
BR
BL B
T
20mm
20mm
< Top view > < Side view >
2)
3)
4)
5)
6)
7)
8)
9)
Face the CRT screen to east and set it verticall .
ê
CRT face
PURITY MAGNET*
4-POLE MAGNET
6-POLE MAGNET
BOW MAGNET
DEFLECTION
YOKE
SEPARATOR
DIFFERENTIAL
COIL
X
V
LOCKING RING
++
X V
TRD
Y
V(a)
+
Y h(t)