The information in this document is subject to change without notice.
SAFETY PRECAUTION
The design of this product contains special hardware, many circuits and components specially for safety pur-
1.
poses. For continued protection, no changes should be made to the original design unless authorized in writing
by the manufacturer. Replacement parts must be identical to those used in the original circuits. Service should
be performed by qualified personnel only.
2.
Alterations of the design or circuitry of the products should not be made. Any design alterations or additions will
void the manufacturer's warranty and will further relieve the manufacturer of responsibility for personal injury or
property damage resulting therefrom.
3. Many electrical and mechanical parts in the products have special safety-related characteristics. These charac-
teristics are often not evident from visual inspection nor can the protection afforded by them necessarily be
obtained by using replacement components rated for higher voltage, wattage, etc. Replacement parts which
have these special safety characteristics are identified in the parts list of Service manual. Electrical components having such features are identified by mark “#” on the schematics and “!” on the parts list in Service
manual. The use of a substitute replacement which does not have the same safety characteristics as the
recommended replacement part shown in the parts list of Service manual may create shock, fire, or other
hazards.
Use isolation transformer.
4.
The chassis and any sub-chassis contained in some products are connected to the primary circuit of the AC
power line. An isolation transformer of adequate capacity should be inserted between the product and the AC
power supply point while performing any service on some products when the primary circuit of the AC power
supply is exposed.
The high voltage applied to the picture tube must conform with that specified in Service manual. Excessive high
5.
voltage conditions should be kept to a minimum, or should be prevented. If severe arcing occurs, remove the AC
power immediately and determine the cause by visual inspection (incorrect installation, cracked or melted high
voltage harness, poor soldering, etc.) To maintain the proper minimum level of soft X-ray emission, components
in the high voltage circuitry including the picture tube must be the exact replacements or alternatives approved
by the manufacturer of the complete product.
6.
Isolation Check
(Safety for Electrical Shock Hazard)
After reassembling the product always 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.
Dielectric Strength Test
(1)
The isolation between the AC primary circuit and all metal parts exposed to the user, particularly any exposed
metal part having a return path to the chassis should withstand a voltage of 1,500V AC(r.m.s.), 20mA(current
sensitivity) for a period of one minute.
This method of test requires a test equipment not generally found in the service trade.
(2)
Leakage Current Check
Plug the AC line cord directly 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,
particularly any exposed metal part having a return path to the chassis, to a known good earth ground (water
pipe etc.). Any leakage current must not exceed 3.5mA AC(r.m.s.).
i
Alternate Check Method
Plug the AC line cord directly 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 sensitivity in the following manner. Connect a 1,500Ω 10W resistor
paralleled by a 0.15uF AC-type 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, particularly any 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. Any voltage measured
must not exceed 2.45V AC(r.m.s.). This corresponds to 3.5mA AC(r.m.s.).
AC VOLTMETER
(HAVING 1,000Ω/V OR MORE SENSITIVITY)
0.15uF AC-TYPE
GOOD EARTH GROUND
1,500Ω 10W
PLACE THIS PROBE ON
EACH EXPOSED METAL
PART
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>
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
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
Headphones
CD player
Audio-LR confirmation equipment
USB compliant computer
Interface adapter (Iiyama handmade)
Short-connector (Iiyama handmade)
<Preparation>
Place the monitor without tilting.
1.
Connect the signal cable from the signal generator to the monitor.
2.
Face the CRT screen to east so as not to be influenced by magnetic force.
3.
4.
Turn ON the Power Switch, and degauss the entire screen with degausser. è See "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.
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.
Comp
–
–
–
–
Sync
on
green
–
–
–
–
34.26
32.36
12.69
7.47
fH
(kHz)
29.2
30.9
77.8
133.9
The resolutions are only for your reference when using Leader 1604A.
*
Resolution*
640×400
800×600
320×350
1600×1200
Sync polarity
H
V
P
P
P
P
P
P
P
P
Horizontal (µsec)
B
A
2.74
2.57
1.06
0.60
C
3.43
3.34
1.64
1.03
D
27.40
25.68
9.40
5.41
E
0.69
0.77
0.59
0.43
O
14.285
20.000
5.000
9.524
Vertical (msec)
P
0.103
0.097
0.038
0.022
Q
0.444
0.455
0.508
0.530
R
13.704
19.416
4.442
8.964
S
0.034
0.032
0.012
0.008
- 1 -
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. Short between pins 2 and 4 of RS connector on the PWB-MAIN with
a short-connector. Turn ON the Power Switch and you are in the Factory Mode. The following Factory
Mode Menu appears on the screen when you press the MENU Button. Turn OFF the Power Switch and
remove the short-connector from RS connector to exit.
PWB-MAIN side
Connector
RS
short
e.g. :
Color Analyzer
connector
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 you are in the Factory Mode. Turn OFF the Power Switch to exit.
RS
CRT face
PWB-MAIN
CRT
ê
The menu items in the Factory Mode are as follows:
Contrast
Brightness
V-size
V-position
H-size
H-position
Pincushion
Trapezoid
Parallelogram
Pinbalance
Sidepin Top
Sidepin Bottom
* DA TEST 3 helps you to perform H/V-BLANKING and H-CONVERGENCE / TILT-DY confirmations in
this SET-UP ADJUSTMENTS. The following items are displayed automatically in turn.
1. H-convergence è 2. Tilt-dy è 3. H/V-blanking
CT
F
f
Pinbalance Top
Pinbalance Btm
DBF Para
DBF Phase
V DBF
H moire
BG
DH
DP
R
B
V moire
H convergence
Tilt-Dy
V linear side
V linear corner
Red gain
- 2 -
G
VD
Temp cont
Blue gain
rrc
V-conver
Bottom-right
Top-right
V
S
T1
Top-left
Bottom-left
CRT check
DA TEST 1
DA TEST 2
DA TEST 3 *
V
C
T2
RG
T3
EXTERNAL DEGAUSS
Make sure you 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 you are in.
PROCEDURE
USER MODE
o
1) Select Degauss and press the MENU Button so that the Bottom-right, Top-right, Top-left and Bottomleft will be disabled.
2) Degauss the entire screen with degausser while the Degauss is activated (approx. 6 seconds).
FACTORY MODE
n
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 stays displayed on the screen.
Note: If the OSD disappears, restart from 1).
3) Degauss the entire screen with degausser.
- 3 -
1-1. 80V-ADJ adjustment [PWB-MAIN]
Receive a cross-hatch inverted signal of MODE 1 when applying the AC
1)
voltage of 110±10V.
Connect the DC voltmeter between CONNECTOR TP and GND (chassis).
2)
Adjust the voltage to DC 80±0.5V with VR951 (80V-ADJ).
3)
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).
4)
Turn ON the Power Switch.
5)
Adjust the high-voltage to 26.0±0.2kV with VR501 (HV-ADJ).
Voltage
VR951
Voltage
80V-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.
1-3. 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.
VR501
HV-ADJ
- 4 -
1-4. TEMPERATURE SENSOR confirmation
n
1)
Receive a cross-hatch inverted signal of MODE 5.
2)
Select CRT Check and press the MENU Button.
3)
Confirm that respective temperature of CRT fannel and monitor front
displayed on the screen is as follows: actual temperature ±5°C.
1-5. FH-LIMITER confirmation
n
1)
Receive a cross-hatch inverted signal of fH 29.2kHz.
2)
Confirm that the picture disappears. Also, make sure the horizontal
oscillation frequency is within the specified range: 58-62kHz.
3)
Receive fH 30.9kHz and confirm that the picture is synchronized.
4)
Receive fH 133.9kHz and confirm that the picture disappears. Also, make
sure the horizontal oscillation frequency is within the specified range above.
5)
Receive fH 77.8kHz 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.
CRT Check
****
35
30
CRT
fannel
Monitor
front
1-6. H-BLANKING confirmation
n
1)
Receive a cross-hatch inverted signal of MODE 5.
2)
Minimize the horizontal size (H-size) with the front buttons.
3)
Select DA TEST 3 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 </= 3.0mm.
5)
Adjust the horizontal size roughly with the front buttons.
Raster rolling
x
Picture
- 5 -
1-7. V-BLANKING confirmation
n
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 DA TEST 3 and press the MENU Button so that the automatic
confirmation program starts.
4)
Confirm that the back-raster is not rolling or tearing at the top.
5)
Confirm that no retrace line is over the picture.
1-8. V-LIN adjustment
n
1)
Receive a cross-hatch inverted signal of MODE 5.
2)
Adjust the vertical size so that the size is 270±4mm.
3)
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
4)
Adjust the vertical linear side (V linear side), so that A, B and C are almost
equal.
Raster rolling
Picture
Raster tearing
Picture
A
C
B
1-9. H-CENT adjustment [PWB-MAIN]
n
1)
Receive a cross-hatch inverted signal of MODE 5.
2)
Adjust the horizontal size and position of the picture roughly with the front
buttons.
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
figure are almost equal.
5)
Return the brightness to center indication.
1-10. TILT-DY adjustment
n
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.
S501
Right
Back-raster
A
Picture
Bezel
Left
B
X
- 6 -
1-11. PICTURE SIZE, POSITION AND DISTORTION adjustment (Criteria)
Pincushion
Trapezoid
Parallelogram
Side pin Top / Bottom
Pinbalance
Side pin Top / Bottom
XX
X
X
Pinbalance Top / Bottom
n
1)
Receive a cross-hatch inverted signal of MODE 5.
2)
Adjust the picture size and position to the specified setting below.
H-size: 360±10mm
V-size: 270±10mm
3)
Correct the side distortion with the front buttons so that X of the right hand
H-position: | A–B |<8mm
V-position: | C–D |<8mm
side figure is as follows: | X | </= 0.5mm/30mm when selecting the most
remarkable distortion with the naked eye.
Pincushion
Trapezoid
Pinbalance
1-12. PICTURE SIZE, POSITION AND DISTORTION adjustment
n
1)
Receive a cross-hatch inverted signal of MODE 5.
2)
Adjust the picture size, position and distortion roughly with the front buttons
Parallelogram
Sidepin Top / Bottom
Pinbalance Top / Bottom
to the reference settings below.
H-size: 360±10mm
V-size: 270±10mm
H-position: | A–B |<8mm
V-position: | C–D |<8mm
| X | </= 1.0mm/30mm when selecting the most remarkable
distortion with the naked eye.
A
30mm
C
Picture
D
X
B
Bezel
Picture
Note: The picture should be within the bezel.
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±10mm
V-size: 270±10mm
5)
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 eye.
Note: No other adjustment items for distortion than the above should be
1-13. RESET confirmation
o
adjusted.
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.
H-position: | A–B |<8mm
V-position: | C–D |<8mm
- 7 -
1-14. Automatic COLOR adjustments
n
WARNING:
Do not change the horizontal and vertical sync signal or the frequency
while the automatic COLOR adjustments are underway.
Color analyzer setting:
Luminance unit switch: cd/m
l
B.P.S. DIP switch: 9600 (1000)
l
Turn ON the color analyzer switch and press 0-CAL switch before use.
l
Be sure to enter the Factory Mode by using the short-connector.
1)
Connect the interface adapter from RS-232C of the color analyzer to the
2)
PWB-RS of the short-connector.
Select VIDEO IN 2 for the signal input and receive a white window signal
3)
of MODE 5.
Turn OFF the R, G and B outputs on the signal generator.
4)
Apply a color analyzer probe to the center of the screen.
5)
Turn ON the Remote Switch of the color analyzer so that the automatic
6)
CUT-OFF adjustment starts.
Turn ON the R, G and B outputs on the signal generator so that the
7)
COLOR TEMPERATURE and CONTRAST LIMIT adjustments start
automatically.
cd/m²
2
Luminance unit switch
1
0
B. P. S. DIP switch
fL
<COLOR TEMPERATURE>
The X and Y specified readings of the color analyzer are as follows:
CT 1 (9300K)
X: 0.283±0.008
Y: 0.297±0.008
<CONTRAST>
The specified contrast range is 120±6cd/m
2
.
Note: In case that the contrast is not within the specified range above,
repeat 4) to 7).
8)
The OSD disappears.
9)
Press the MENU Button so that the OSD appears.
10)
All adjustment data is stored when the OSD disappears.
11 )
Turn OFF the Remote Switch of the color analyzer.
Note: The adjustments above can be repeated by turning OFF and ON the
Power Switch.
1-15. GRAY SCALE confirmationn
1)2)Receive a 16-gradation gray scale signal of MODE 5.
Make sure the 15th gradation on the gray scale is barely visible when the
16th gradation (back raster) is not visible at all.
- 8 -
n
1-16. BRIGHTNESS adjustment [PWB-MAIN]
1)
Receive an entire white raster signal of MODE 5.
2)
Apply a photometer to the screen center.
3)
Adjust VR502 (ABL-ADJ) so that photometer reads 105±5cd/m2.
1-17. SYNC SIGNAL INPUT confirmation
n
1)
Receive a cross-hatch inverted signal of MODE 4.
2)
Select composite and sync on green signal inputs respectively by the
signal generator.
3)
Confirm that the picture is displayed normally.
1-18. SIGNAL SELECT confirmation
o
1)
Receive a cross-hatch inverted signal of MODE 5.
2)
Switch the signal input to VIDEO IN 1 and VIDEO IN 2 respectively.
3)
Press the Input Select Button (VIDEO 1/2) for approx. 5-6 seconds.
4)
Confirm that the picture is displayed normally.
Brightness
VR502
ABL-ADJ
1-19. POWER MANAGEMENT confirmation
o
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 3W 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.
1-20. H-CONVERGENCE confirmation
n
1)
Receive a cross-hatch inverted signal of MODE 5.
2)
Select H-convergence or DA TEST 2, and press the MENU Button so that
the automatic confirmation program starts.
3)
Confirm that the horizontal line is diverged.
- 9 -
1-21. V-CONVERGENCE confirmation
n
1)
Receive a cross-hatch inverted signal of MODE 5.
2)
Select V-convergence or DA TEST 2, and press the MENU Button so that
the automatic confirmation program starts.
3)
Confirm that the vertical line is diverged.
1-22. RASTER REGULATION (DYNAMIC) confirmation
n
1)
Receive an entire white signal of MODE 5.
2)
Set the input signal by the signal generator as follows:
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 <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” respectively.
5)
Return the brightness to center indication.
Back-raster
Picture
W
1-23. FOCUS [PWB-MAIN]
n
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
points L, M and R as shown in Fig 1.
3)
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.
4)
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.)
5)
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.)
6)
Repeat 2) to 5) until the focus is optimum.
7)
Confirm no focus variation on the entire screen.
8)
Check the focus with red and blue respectively.
9)
Receive a H-character signal and repeat 7).
10)
Repeat the FOCUS adjustments until the focus with red, green and blue
is optimum.
FOCUS-A
FOCUS-B
SCREEN
L
Fig.2
L
Thick
T501(FBT)
M
Fig.1
T Thin
M Thick
B Thin
M
Thick
Thin
R
R
- 10 -
Fig.3
1-24. LUMINANCE DIFFERENCE confirmation
1)
Receive an entire white signal of MODE 5.
2)
Apply a photometer to the two points where the luminance difference is
remarkable with the naked eye.
3)
Confirm that the luminance difference is 22.5cd/m2 or less.
1-25. 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 player to the Audio Connector and make sure the right and left speaker
works normally.
4) Turn the Volume Control and make sure the volume varies.
5) Connect Audio-LR confirmation equipment between the Audio Connector and CD player.
6) Turn off left switch of the Audio-LR confirmation equipment and make sure the right speaker works
normally.
7) Turn off right switch of the Audio-LR confirmation equipment and make sure the left speaker works
normally.
TL
T
L
C
B
TR
R
BRBL
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.
1-26. USB Operation Check
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 “Iiyama 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 “Iiyama 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 normally.
- 11 -
Double-click
here
Fig. 1
Fig. 2Fig. 3
“Generic USB Hub” or “Iiyama USB Hub”
- 12 -
1-27. ITC (Integrated Tube Component) adjustments
TL
TR
BR
BL
B
T
20mm
20mm
n
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*
4-POLE MAGNET
6-POLE MAGNET
LOCKING RING
BOW MAGNET
Y
V(a)
+
CRT face
+
TRD
X
ê
X
V
Y
h(t)
+
V
DIFFERENTIAL
COIL
DEFLECTION
YOKE
SEPARATOR
1-27-1. LANDING correction
Landing meter setting:
Mode Select Switch: Monitor Normal
l
Note: Mode Select Switch should be set before turning on the power switch of the landing meter.
Volt:2V
l
Time:50ms
l
Gain:7
l
Unit:% for LND-070, 0.8µm (1%=0.8µm) for LND-072
l
1)
Face the CRT screen to east and set it vertically.
Degauss the entire screen with degausser. è See "EXTERNAL DEGAUSS".
2)
3)
Select DEGAUSS and press the MENU Button.
Receive an entire green signal.
4)
Adjust the horizontal size to make it full-scan.
5)
Apply the landing meter to TL (top-left), TR (top-right), BL (bottom-left) and
6)
BR (bottom-right) in the right hand side figure.
Confirm that "H" reading of the landing meter is within ±20% at each point.
7)
Adjust rrc with the front buttons so that the "H" reading difference between
8)
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 respectively with
9)
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%
- 13 -
1-27-2. TRD adjustment
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 1-27-6. YV (a) adjustment after
this adjustment because the convergence adjusted by YV
volume is changed at the same time during this adjustment.
1)
Receive a cross-hatch inverted signal.
2)
Adjust the specified TRD volume so that the picture distortion is corrected.
1-27-3. STATIC CONVERGENCE adjustment
Receive a red and blue cross-hatch signal.
1)
Adjust the 4-POLE MAGNET so that red and blue beams converge on the
2)
center cross lines.
Add green to the red and blue cross-hatch signal.
3)
Adjust the 6-POLE MAGNET so that red and blue beams converge with
4)
green beam on the center cross lines.
Repeat the adjustment until red, blue and green beams converge each
5)
other.
Fix the 4-POLE MAGNET and the 6-POLE MAGNET by turning the
6)
LOCKING RING.
Bezel
Picture
R
B
G
R,B
R,G,B
Picture
B
R,B
Picture
R
G
R,G,B
Mark the 4-POLE MAGNET and the 6-POLE MAGNET with paint marker
7)
(090Z029A01) so that adjusted position is understandable.
1-27-4. BOW MAGNET adjustment
1)
Receive a red and blue cross-hatch signal.
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.
3)
Perform the 1-29-3. STATIC CONVERGENCE adjustment so as to converge
the red and blue lines.
1)2)Receive a red and blue cross-hatch signal.
Adjust the DIFFERENTIAL COIL so that the horizontal cross line converge
each other.
R
B
B
R
R
B
R,B
- 14 -
1-27-6. YV (a) adjustment
1)
Receive a red and blue cross-hatch signal.
2)
Adjust the specified YV (a) volume so that red and blue beams
converge each other at the upper and lower edges of the horizontal
line.
B
R
R
B
R,B
R,B
1-27-7. YH (t) adjustment
1)
Receive a red and blue cross-hatch signal.
2)
Adjust the specified YH (t) volumes so that vertical cross lines converge
each.
1-27-8. SCREEN-CORNER MISCONVERGENCE correction
Receive a red and blue cross-hatch signal.
1)
Affix a *ferrite sheet (890Z003A02/890Z003A03/800Z003A05) between
2)
SEPARATOR and CRT corresponding to the partially misconverged areas.
Note: Must be careful not to affect distortion by this correction.
Fix the ferrite sheet with ACETATE-TAPE (890P306A10).
3)
Note: Only for 800Z003A02 and 800Z003A03)
10
10
R
B
R,B
R
B
B
R
B
R
R
B
100
(890Z003A02)
Ferrite
(890Z003A03)
*Ferrite sheet
Ferrite
10
90
70
(in mm)
(890Z003A05)
- 15 -
Mode
1
2
3
4
5
6
7
2. TIMING CHART
- 16 -
P
Q
R
S
O
V-parameters
O: Total period
P: Sync.width
Q: Back porch
R: Active video
S: Front porch
Video
Sync
B
C
D
E
A
H-parameters
A: Total period
B: Sync.width
C: Back porch
D: Active video
E: Front porch
R
15.253
11.093
11.179
11.183
11.235
11.294
11.204
S
0.318
0.023
0.019
0.015
0.011
0.009
0.007
Vertical (msec)
@ 60Hz
@ 85Hz
@ 85Hz
@ 85Hz
@ 85Hz
@ 85Hz
@ 85Hz
640×480
640×480
800×600
1024×768
1280×1024
1600×1200
1920×1440
fH
(kHz)
31.469
43.269
53.674
68.677
91.146
106.250
128.520
fV
(Hz)
59.940
85.008
85.061
84.997
85.024
85.000
85.000
Sync polarity
H
N
N
P
P
P
P
P
V
N
N
P
P
P
P
P
Q
1.048
0.578
0.503
0.524
0.483
0.433
0.529
P
0.064
0.069
0.056
0.044
0.033
0.028
0.023
O
16.683
11.764
11.756
11.765
11.761
11.765
11.765
E
0.636
1.556
0.569
0.508
0.406
0.279
0.445
D
25.422
17.778
14.222
10.836
8.127
6.972
5.625
C
1.907
2.222
2.702
2.201
1.422
1.325
1.078
Horizontal (µsec)
B
3.813
1.556
1.138
1.016
1.016
0.837
0.633
A
31.778
23.111
18.631
14.561
10.971
9.412
7.781
Comp
–
–
–
–
–
–
–
Sync
on
green
–
–
–
–
–
–
–
VESA Timing Name
3. IC APPLICATION
Ref No.Description
Deflection circuit
IC350
IC401
IC502
Power circuit
IC901STR-G6551Sub power control
IC920
IC921KIA4315V output control
IC950KIA43128V output control
IC951STR-F6676Main power control
IC952MC34262/MC33262Power factor control
IC953AN7712F/UPC2412HF 12V regulator
IC350UPC1888FCTVariable B control
IC351781212V regulator
IC20878055V regulator
Microprocessor circuit
IC104 TMP47P241VNSub microprocessor (741Z620-10)
IC301Microprocessor (741Z626-10)TMP86PP11N
IC302M51951BSL/KIA7045P 5V watcher
IC303E2PROM
UPC1888FCT
LA7840L
SLA5057
LM317T6.3V regulator (Heater voltage ON/OFF control)
Function
V-SYNC signal input
H-SYNC / COMP signal input
V-SYNC signal out
H-SYNC signal out
Video clamper
N.C.
HM903DT and A902MT-v switch
Degauss control signal output
H-LIN-1 switching signal output
2
PROM SDA
E
2
E
PROM SCL
UPC1888/PRF/OSD/DA SDA
UPC1888/PRE/OSD/DA SCL
Sub microprocessor DATA-OUT
Sub microprocessor DATA-IN
Sub microprocessor CLOCK
H-DRIVE switching signal output
H-LIN-2 switching signal output
Diagnostic mode
Automatic adjustment data output
Automatic adjustment data input
Sub microprocessor specifications
Pin
1
2
3
4
5
6
7
8
9
10
11
12
13
14
Name
VREF
R40(AIN0)
R41(AIN1)
R42(AIN2)
R43(AIN3)
R71(WT0)
R80(INT2)
R81(T2)
R82(INT1)
P10
P11
P12
P13
Vss
5V Vcc
Front Menu key signal (0/2.5V)
Front four key signal (0/2/3/4V)
Surrounding temperature detection
N.C.
Volume control 1
N.C.
PS1 (main power off signal)
Signal select
Volume control 2
Volume control 3
Volume control 4
LED signal out
GND
Function
Pin
28
27
26
25
24
23
22
21
20
19
18
17
16
15
- 18 -
Name
VDD
K03
K02
K01
K00
HOLD
HOLD(KE0)
RESET
XOUT
XIN
R92(SCK)
R91(SO)
R90(SI)
P20
Function
5V Vcc
GND
GND
GND
GND
GND
GND
Reset
4MHz CLOCK
4MHz CLOCK
Main microprocessor CLOCK
Main microprocessor DATA-IN
Main microprocessor DATA-OUT
PS2 (heater off)
4. CIRCUIT DESCRIPTION
4-1. POWER SUPPLY circuit
Power supply circuit consists of MAIN POWER circuit on PWB-MAIN and SUB POWER circuit on PWB-VIDEO.
These circuits are an asynchronous switching power supply circuit of secondary output feedback with using IC901
and IC951 built-in output FET and control IC.
Power supply start procedure is as follows;
Power switch is turned ON.
Q
SUB POWER circuit (5V and 8.5V output) is turned on.
R
K901 (RELAY) is turned on.
S
POWER FACTOR circuit (400V output) is turned on.
T
MAIN POWER circuit (80V, 28V, 15V and -12V output) is turned on.
U
Monitor is activated.
V
(1) POWER FACTOR circuit
The voltage waveform from current is controlled to be in proportion with input voltage at pressor chopper circuit.
This circuit is prevented from being harmonic by compared with following waveforms.
The full-wave rectified voltage waveform from D950 via PWB-STAND and smoothed voltage waveform from
Q
C959.
The voltage waveform from Q950 of source terminal.
R
and R waveforms are compared at IC952. Q950 is turned off when R exceeds Q, and turned on when R is
Q
0V. This repetition is to change input current to substantially sinusoidal waveform and it corrects harmonic
distortion.
The output voltage is set to 400V for world wide compliance.
The switching frequency is not constant as Q950 is turned on or off by monitoring input voltage and load current.
The switching frequency is approx. 50-250kHz.
AC-IN
90-132/
198-264V
D950
IC952
T951
400V
C959
Q950
- 19 -
(2) MAIN POWER circuit
400V is supplied to this circuit from the POWER FACTOR circuit. Start-up resister R968 and R969 detect 4 pin of
IC951 voltage (VCC-IN) and activate internal start circuit of IC951. When 4 pin of IC951 voltage turns to 16V, internal
control circuit starts operation and auxiliary coil voltage between 8 and 9 pin of T950 (main transformer) is up to
approx.18V, and MAIN POWER circuit is activated.
IC950 detects the load of 28V output voltage from the T950 secondary and controls the feedback current in PC950
(photocoupler) by fed back to 1 pin of IC951 (OCP/FB).
The T950 secondary provides the following DC voltages:
80V line: Supplied to the HIGH VOLTAGE OUTPUT (T501) and the VIDEO OUTPUT IC (IC202) and
Q
the CUT-OFF IC (IC204) as power source.
28V line:Supplied to the HORIZONTAL DEFLECTION OUTPUT (variable B voltage control) circuit
R
and HORIZONTAL DRIVE circuit as power source.
15V line:Supplied to the each 12V POWER CONTROL circuit, the CRT CORRECTION circuit and the
S
VERTICAL OUTPUT IC (IC104, +) as power source.
–12V line: Supplied to the CRT CORRECTION circuit and the VERTICAL OUTPUT IC (IC104, –) as
T
power source.
AC-IN
90-132/
198-264V
K901
D950
POWER FACTOR
circuit
T950
80V
1
IC951
PC950
<Waveform> fH=91.2kHz fV=85Hz 1280 × 1024
IC951pin3Drainoutput(200V/div)
IC951pin1OCP/FBinput(2V/div)
2
28V
3
15V
-12V
4
Note: 1. The Switching frequency always vary because power supply is asynchronous.
2. The actual waveform is not static like as above waveform.
- 20 -
(3) SUB POWER circuit
When AC input is supplied to SUB POWER circuit, start-up resister R908 and R909 detect 4 pin of IC901voltage
(VCC-IN) and activate internal start circuit of IC901. When pin 4 of IC901 voltage turns to 16V, internal control circuit
starts operation and auxiliary coil voltage between 2 and 3 pin of T901 (sub transformer) is up to approx.18V, and
SUB POWER circuit is activated.
IC950 detects the load of 5V output voltage from the T901 secondary and controls the feedback current in PC901
(photocoupler) by fed back to 5 pin of IC951 (OCP/FB).
The T901 secondary provides the following DC voltages:
8.5V line: Supplied to the Heater voltage IC (IC920) and the Audio-Amp (IC501) as power source.
Q
5V line:Supplied to the Microprocessor (IC301 and IC104), USB-IC (IC701), SW-IC (IC101) and 5V
R
CONTROL circuit as power source.
AC-IN
90-132/
198-264V
<Waveform>
D901
IC901
T901
PC901
8.5V
1
IC901pin1Drainoutput(100V/div)
IC920
2
6.3V
5V
Note: Above waveform is switching waveform when USB peripherals are not connected.
IC901pin5OCP/FBinput(0.5V/div)
- 21 -
(4) Power management modes
When IC301 (main microprocessor) detects presence of horizontal and vertical sync signal and video signal,
control signal is output from IC104 (sub microprocessor). The control signal stops MAIN POWER circuit and
decrease heater voltage, and power consumption is reduced.
<Power save control signals>
Mode
Normal
Power
Management
Q920 and K901 (RELAY) are turned off when "LOW" signal is output from 8 pin of IC104. AC input is not supplied
to PWB-MAIN when K901 is turned off as K901 switch AC input, and MAIN POWER circuit stops. Q921 is
turned off when "HIGH" signal is output from 15 pin of IC104. The output voltage of Heater output IC decrease
from 6.3V to 0V. The power consumption is 3W or less.
Sync signal
H,V-Sync, VIDEO: ON
H,V-Sync,VIDEO: OFF
PS1
IC104 pin 8
HIGH
LOW
PS2
IC104 pin 15
LOW
HIGH
LED
IC104 pin 13
HIGH
(Green)
LOW
(Orange)
Circuit
All circuits are activated.
All circuits except for 5V line stop.
4-2. SYNC SIGNAL PROCESSING circuit
The input sync signal from D-SUB connector is set input condition of VIDEO IN 1 / 2 and sync signal by IC105 (SWIC) and input to pins 2 (H / HV-IN), 5 (V-IN) and 3 (SOG) of IC101 (Sync-Processor). The input H/V-sync signal is
waveform-shaped and kept polality positive. HV (Comp.) and SOG signals are separated V sync signal. And the
input H/V sync signal is output from pins 13 (H-OUT) and 11 (V-OUT) and supplied to pins 41 (H-IN) and 42 (V-IN)
of IC301 (Microprocessor), and then output from pins 39 (H-OUT) and 40 (V-OUT) of IC301 and supplied to pins 26
(H-IN) and 27 (V-IN) of IC350 (H/V oscillation IC) to control the horizontal and vertical deflection.
The setting of signal input condition monitors H/V-sync signal applied to IC301, and output SIGNAL SELECT signal
from pin 9 of IC104 and S.O.G. switching signal from pin 7 of IC104.
(1) SIGNAL SELECT signal:Set VIDEO-IN 1/2 by controlling pin 13 of IC101.
D-SUB input
VIDEO-IN 1
VIDEO-IN 2
(2) The input sync signal to IC301 is processed by SYNC SIGNAL PROCESSING circuit in IC301 as follows:
Discriminate the input sync signal type: Separate / Composite
Q
Detect the input sync signal presence
R
Count the frequency
S
Counting criterion: X'TAL 12MHz (X301)
IC104 pin 9
LOW
HIGH
- 22 -
4-3. CONTROL circuits
(1) HORIZONTAL / VERTICAL OSCILLATION circuit
The H/V-sync signal input to IC350 is phase-sifted and converted to the waveform in IC350. The pulse
synchronized with the horizontal sync signal is output from pin 17 as horizontal drive pulse. The sawtooth wave
synchronized with the vertical sync signal is output from pin 4.
The pulse output from pin 17 generates a frequency locked to the input signal under the following conditions:
Q The horizontal sync signal is input to pin 26.
R The vertical sync signal is input to pin 27.
S The feedback pulse (AFC pulse) of the HORIZONTAL DEFLECTION OUTPUT circuit is input to pin 18.
IC350 (UPC1888FCT) is auto-sync system and adjusts the horizontal frequency automatically make the vertical
sync signal input to pin 27 trigger. In case that the AFC pulse is not input, the output pulse from pin 17 is
unlocked and the horizontal picture size changes with keeping it small and picture is not synchronized.
<Horizontal Waveform>
IC350pin26H-syncinput(2V/div)
IC350pin17HD-OUToutput(10V/div)
IC350pin18AFCinput(5V/div)
(2) VERTICAL DEFLECTION circuit
The sawtooth wave output from pin 4 of IC350 is amplified by IC401 (V-OUT-IC) and then supplied to the
deflection yoke as a vertical deflection current to control the vertical deflection.
V-position is controlled by changing the DC component of the sawtooth wave output from pin 4.
<Vertical Waveform>
IC350pin27V-syncinput(5V/div)
IC350pin4sawtooth-waveoutput(2V/div)
IC401pin2V-OUToutput(20V/div)
- 23 -
(3) HORIZONTAL SIZE and DISTORTION CONTROL circuits
The variable B voltage control pulse synchronized with the horizontal sync signal is output from pin 14 of
IC350. The control pulse makes the PRESSOR CHOPPER circuit consisted of L955, Q951 and D964 output
the variable B voltage of horizontal deflection output.
The horizontal size control voltage and distortion control parabolic wave output from pin 5 are input to pin
11 and then the output pulse of pin 14 controls the horizontal size and distortion as follows:
Q H-size:The output duty of pin 14 is varied by the DC voltage input to pin 11.
R Distortion: The parabolic wave (AC component) input to pin 11 is synthesized with the output pulse of
pin 14.
ACcomponent...Distortion
DCcomponent
...H-size
IC350pin5output(0.5V/div)
IC350pin26H-syncinput(5V/div)
IC350pin18AFCinput(5V/div)
IC350pin17HD-OUToutput(10V/div)
IC350pin14VariableBcontrolpulse(0.5V/div)
- 24 -
4-4. HORIZONTAL DEFLECTION circuit
(1) HORIZONTAL DRIVE circuit
The horizontal drive pulse output from pin 17 of IC350 is amplified by Q504 and T502 and then supplied to Q503
(H-OUT) base as a current.
The current is amplified by Q503 and then supplied to the deflection yoke as a horizontal deflection current to
control the horizontal deflection.
Q504Gateinput(10V/div)
Q504Drainoutput(20V/div)
Q503correctoroutput(200V/div)
(2) HORIZONTAL LINEARITY CORRECTION circuit
The switching signal from IC301 controls H-LIN-COIL (L503, L504 and L507), S-correction capacitor (C510,
C511, C512, C513, C514 and C557) and FET-ARRAY (IC502), and then correct linearity every frequency.
Each switching point performs horizontal linear and distortion correction as follows:
IC301 output pin
CS6
H-LIN1
H-LIN2
fH (kHz)
30.0 - 34.0
34.1 - 41.0
41.1 - 45.0
45.1 - 49.0
49.1 - 59.0
59.1 - 66.0
66.1 - 73.0
73.1 - 84.0
84.1 - 88.5
88.6 - 97.0
97.1 - 115.0
115.1-130.0
CS1
(Pin 6)
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
CS2
(Pin 7)
LOW
HIGH
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
CS3
(Pin 9)
LOW
LOW
LOW
LOW
HIGH
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
CS4
(Pin 15)
LOW
HIGH
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
HIGH
HIGH
HIGH
CS5
(Pin 16)
LOW
HIGH
LOW
HIGH
HIGH
LOW
LOW
LOW
HIGH
LOW
HIGH
HIGH
(Pin 17)
LOW
HIGH
LOW
HIGH
LOW
LOW
HIGH
LOW
LOW
LOW
LOW
HIGH
(Pin 34)
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
(Pin 25)
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
DRIVE
(Pin 26)
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
- 25 -
4-5. DYNAMIC BEAM FOCUS (DBF) circuit
(1) H-DBF
The parabolic wave of horizontal period is output from pin 9 of IC350 (HDFO) and then amplified by
Q516 and Q517. It increases up to approx. 500Vp-p by T503 and synthesized with V-parabolic
wave and then applied to pin 13 (DF) of T501 (FBT).
CRTcathodeinput(Hperiod)
T501(FBT)pin13inputDBFhorizontalelement(100V/div)
(2) V-DBF
The parabolic wave of vertical period is output from pin 8 of IC350 (VDFO) and then amplified by
Q520. It is synthesized with H-parabolic wave.
CRTcathodeinput(Vperiod)
T501(FBT)pin13input(200V/div)
- 26 -
4-6. VIDEO circuit
(1) Pre-amp
The video signal from D-SUB connector via IC101 (SW-IC) is input to pins 1 (R-IN), 3 (G-IN) and 6 (B-IN) of IC201
pre-amplifier. This video signal is clamped by clamp signal input to pin 13 of IC201. The blanking signal input
to pin 14 is synthesized with the clamped signal and then output from pins 29 (R-OUT), 27 (G-OUT) and 25 (BOUT) respectively.
V-BLK signal:Remove the raster retrace line.
H-BLK signal:Remove the side raster rolling.
I2C-BUS controls D/A converter in IC201 as follows:
QContrast
RSub-brightness
SR/G/B drive
TOSD contrast
UD/A output for the CUT-OFF circuit
VGamma correction
WSharpness correction
(2) ABL
DC voltage input to pin 7 of IC201 controls the amplitude of the video output signal. Therefore, it controls the
FBT beam current.
ABL is activated (entire white raster):Approx. 3.5VDC at pin 7
ABL is not activated (window):Approx. 4.1VDC at pin 7
The parabolic waveform is added to video output signal by synthesizing the H-DBF parabolic waveform from
Q301 and it corrects a luminance difference between the left and right side of the picture.
(3) VIDEO-OUT and CUT-OFF circuits
The video signal input to pins 9 (R-IN), 8 (G-IN) and 11 (B-IN) of IC202 (VIDEO-OUTPUT) is amplified reversely
and then output from pins 3 (R-OUT), 5 (G-OUT) and 1 (B-OUT) respectively.
The R/G/B-cut-off and brightness D/A control voltages output from pins 18-21 of IC201 pre-amplifiers are
amplified by IC204 (CUT-OFF-IC), and then added to the video signal from IC202 and supplied to the CRT
cathode grid.
CRTcathodeinput(20V/div)
IC201Videooutput(10V/div)
IC201pin7ABLinput(2V/div)
IC201pin13clampinput(5V/div)
- 27 -
4-7. HIGH VOLTAGE CONTROL / OUTPUT circuit
The AFC pulse output from the HORIZONTAL DEFLECTION OUTPUT (L501 pin 9) applied to pin 4 of IC501
(HV-CONT-IC) and then a control pulse synchronized with the frequency of the AFC pulse is output from pin 1 of
IC501 and operate Q521 (HV-OUT).
For stabilizing high voltage output control, this circuit is to detect a feedback voltage from pin 11 of T501 (FBT) and
feed back to pin 6 of IC501, change the output duty of pin 1 of IC501, and control the high voltage change due to the
brightness changes.
IC501pin4AFCinput(50V/div)
IC501pin1H/Voutput(20V/div)
Q521Drainoutput(200V/div)
T501pin1output(200V/div)
4-8. PROTECTION circuit
This circuit is composed of the following protection circuits to prevent a damage to the monitor and X-ray radiation
when the monitor is inoperative.
When the circuit is in the following cases, pin 19 of IC350 (XRAY) turns to 5V and then the horizontal drive pulse
output from pin 17 and the variable B control pulse output from pin 14 turn to “LOW” level (0V). It makes the
HORIZONTAL DEFLECTION OUTPUT and the HIGH VOLTAGE OUTPUT circuits stop.
The signal that the X-RAY PROTECTION circuit is activated is sent to IC301 (Main Microprocessor) from IC350 by
I2C-BUS when pin 19 turns to 5V. IC301 receives the signal and then PS1 signal of pin 8 of IC104 turns to “LOW”
level and PS2 signal of 15 pin of IC104 turns to “HIGH” so that the MAIN POWER circuit is turned off.
In case that the PROTECTION circuit is activated and the HORIZONTAL DEFLECTION OUTPUT, HIGH VOLTAGE
OUTPUT and MAIN POWER circuits are turned off, turn OFF and ON the Power Switch to recover.
The PROTECTION circuit operates in the following cases:
Q +B9 line:The voltage is 220V or more.
R X-RAY PROTECTION circuit:The high voltage is 29.0kV or more.
S ARC LIMIT circuit:The beam current in FBT is 3.0mA or more.
- 28 -
4-9. CRT CORRECTION circuit
Following adjustment and functions are for CRT correction.
Q H/V-CONVERGENCE
R TILT-DY
S NS-RRC
T Landing (TR/TL/BR/BL)
(1) H/V-CONVERGENCE and TILT-DY
The signal input to IC205 (D/A) from IC301 (Main Microprocessor) by I2C -BUS is output from pins 2 (TILT), 3 (HCONV), 4 (V-CONV) and vary the current applied to each coils built-in deflection yoke by IC206 and IC207
(POWER-OP-AMP). It makes H/V-CONVERGENCE and TILT-DY change.
(2) NS-RRC
The signal input to pins 18 and 19 of IC301 from IC304 (Terrestrial magnetic sensor) and applied to IC205, and
output from pin 1 of IC205, and vary the current in NS-COIL by IC206. It makes NS-RRC change.
(3) Landing
TH150 (thermistor) detects the set surrounding temperature and CT connector (thermistor) detects the CRT
temperature of funnel. These correct the landing temperature.
The information of the CRT temperature of funnel is received at pin 20 of IC301 and the information of surrounding
temperature is received at pin 4 of IC104, and then sent to IC301 by I2C-BUS. The information is output from pins
10, 11, 12 and 13 of IC301 as pulse width modulation and vary the current in Landing correction coil (TR/TL/BR/
BL) by IC801 and IC802 (POWER-OP-AMP). It makes Landing change.
4-10. LANDING CORRECTION circuit
This circuit detects the followings to correct LANDING discoloration.
•Magnetic field.....TERRESTRIAL MAGNETIC SENSOR (IC304) detects the magnetic field.
•SWITCH ON DRIFT.....TH801 detects surrounding temperature. Thermistor attached to the funnel detects the
When the above condition is changed, the MICROPROCESSOR (IC301) informs the change to the D/A CONVERTER
(IC205). The output signal from IC205 is amplified by IC801, IC802, IC206 and IC207 to correct LANDING discoloration
automatically by the coils N-S RRC, TL, TR, BL and BR.
The LANDING correction also can be performed with the front buttons.
The audio signal from CN602 (AUDIO-IN) is amplified by IC601 (AUDIO-AMP) and output to Speaker and Headphone
jack.
The VR voltage (0-1.2V) from pin 9 of IC601 switch output of pins 6, 10, 11 and 12 of IC104 to HIGH and LOW to
control the volume.
IC601 stops when Q601 is turned on under the power management mode.
IC104 output pin
Pin 6
Pin 10
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
HIGH
LOW
LOW
HIGH
HIGH
LOW
LOW
HIGH
HIGH
LOW
LOW
HIGH
HIGH
LOW
LOW
HIGH
HIGH
Pin 11
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
Pin 12
LOW
LOW
LOW
LOW
LOW
LOW
LOW
LOW
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
HIGH
Level
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Input Voltage
IC601 pin 9
0.020
0.046
0.073
0.104
0.135
0.172
0.211
0.256
0.292
0.346
0.404
0.473
0.546
0.636
0.736
0.861
4-12. USB circuit
This circuit detects connecting condition of the upstream port (CN701 UP) from PC and the downstream port
(CN702 and CN703) from peripherals and communicate with PC by IC701 (USB-CONT-IC). USB cable (series A/B)
is composed of 5V, GND, +D and -D signals. The condition of connection is judged from by detecting data transfer
rate of peripherals connected by +D and -D combination at IC701. (The condition of connection is detected whether
+D and -D signals are pulled up or not.)
PC
Upstream×1
IC701
(USB-CONT-IC)
Downstream×4(0.5A/1port)
Peripherals
- 30 -
5. SERVICE PARTS LIST
The components identified by “ ! ” in this manual are critical
for safety.
Replace only with part number specified .
Abbreviations and Marks.......................................................................................