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NO. S2201E02 August 29, 2001
SERVICE MANUAL HA202DT
Copyright
I I YA M A C O R P O R AT I O N
710-1 Kitaowaribe, Nagano-shi 381-0014 JAPAN
[ Revision Record ] Rev. Section Contents
CONTENTS
Page SAFETY PRECAUTION.............................................................................
i-ii
17
1. SET-UP ADJUSTMENTS............................................................................... 1-16 2. TIMING CHART..............................................................................................
3. IC APPLICATION........................................................................................... 18-19 4. CIRCUIT DESCRIPTION................................................................................. 20-31 5. SERVICE PARTS LIST................................................................................... 32-57 6. EXPLODED VIEW......................................................................................... 57-68 7. DIAGRAMS................................................................................................... 69-72
NOTICE
The information in this document is subject to change without notice.
SAFETY PRECAUTION
1. The design of this product contains special hardware, many circuits and components specially for safety purposes. 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 characteristics 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.
4. Use isolation transformer. 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. 5. 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 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. (1) Dielectric Strength Test 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 1,500 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 1,000/V OR MORE SENSITIVITY)
0.15uF AC-TYPE
GOOD EARTH GROUND
1,500 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. 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 Headphones CD player Audio-LR confirmation equipment USB compliant computer 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. 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 on H V Comp green A P P 34.26 P P 32.36 N N O O 21.00 P P 12.69 Horizontal (µsec) B 2.74 2.57 2.00 1.06 C D 3.43 27.40 3.34 25.68 2.36 15.76 1.64 9.40 Vertical (msec) E P S O Q R 0.69 14.285 0.103 0.444 13.704 0.034 0.77 20.000 0.097 0.455 19.416 0.032 0.88 16.695 0.084 0.420 15.115 1.076 0.59 5.000 0.038 0.508 4.442 0.012
(kHz) 29.2 640×400 30.9 800×600 47.6 1024×720 77.8 320×350
Resolution*
* The resolutions are only for your reference when using Leader 1604A.
-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
PWB-MAIN side
short
RS connector
RS Connector
e.g. : Color Analyzer
CRT
ê
CRT face
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.
DP DH VD CT B G
R B G
RG T1 T2 T3
VS VC
F f
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 Pinbalance Top Pinbalance Btm DBF Para DBF Phase V DBF H moire V moire H convergence Tilt-Dy V linear side V linear corner Red gain 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
-2-
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 o USER MODE
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).
n 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 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]
1) Receive a cross-hatch inverted signal of MODE 1 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 83±0.5V with VR951 (80V-ADJ).
Voltage
VR951 80V-ADJ
1-2. ANODE VOLTAGE adjustment [PWB-MAIN]
WARNING ! VR501 (HV-ADJ) and VR503 have been carefully factory-adjusted for each unit in order to satisfy regulations regarding X-radiation. Further adjustment on VR501 and VR503 shall not be performed. In case of adjustment, the adjusted position of VR501 and VR503 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 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 8 respectively. 7) Turn OFF the Power Switch and remove the high-voltage probe.
VR501 HV-ADJ Voltage
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). 4) Adjust the screen voltage to 630±10V with SCREEN VR located lower of T501 (FBT). Note: SCREEN VR should not be turned after the adjustment above.
T501(FBT) Voltage
S
CREE
N
1-4. X-ray ADJ adjustment [PWB-MAIN]
1) Receive a cross-hatch inverted signal of MODE 5. 2) Turn OFF the R, G and B outputs on the signal generator. 3) Connect the DC voltmeter between D526 cathode (TP-XRAY ADJ) and GND (chassis). 4) Adjust the voltage to DC 1.7±0.1V with VR503.
Voltage
VR503
-4-
1-5. 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 360±40V. 6) Remove the DC voltmeter.
n1-6. TEMPERATURE SENSOR confirmation
1) Receive a cross-hatch inverted signal of MODE 5. 2) Select CRT Check and press the MENU Button.
CRT Check
****
35 30
CRT fannel Monitor front
3) Confirm that respective temperature of CRT fannel and monitor front displayed on the screen is as follows: actual temperature ±5°C.
n1-7. FH-LIMITER confirmation
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 77.8kHz and confirm that the picture is synchronized. 5) 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. 6) Remove the frequency counter.
n1-8. H-BLANKING confirmation
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 2 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 Raster rolling
x
Picture
-5-
n1-9. 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 DA TEST 2 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.
Raster rolling Raster tearing
Picture
Picture
n1-10. V-LIN adjustment
1) Receive a cross-hatch inverted signal of MODE 7. 2) Adjust the vertical size so that the size is 295±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: | AB | B A
C
n1-11. H-CENT adjustment [PWB-MAIN]
1) Receive a cross-hatch inverted signal of MODE 8. 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.
A
S501
Right Back-raster
Left
Picture
B
Bezel
n1-12. 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 | X
-6-
n1-13. PICTURE SIZE, POSITION AND DISTORTION adjustment (Criteria)
1) Receive a cross-hatch inverted signal of MODE 5. 2) Adjust the picture size and position to the specified setting below. H-size: 395±4mm H-position: | AB |<4mm V-size: 295±4mm V-position: | CD |<4mm 3) Correct the side distortion with the front buttons so that X of the right hand side figure is as follows: | X | 30mm
C A
Picture
B
D
Bezel
X
n1-14. PICTURE SIZE, POSITION AND DISTORTION adjustment
1) Receive a cross-hatch inverted signal of fH MODE 5.
X X X
Picture
X
2) Adjust the picture size, position and distortion roughly with the front buttons to the reference settings below. H-size: 395±10mm H-position: | AB |<8mm V-size: 295±10mm V-position: | CD |<8mm | X | Parallelogram Pinbalance Pincushion
Trapezoid
5) Correct the Pincushion and Trapezoid distortion with the front buttons so that X of the right hand side figure is as follows: | X |
Side pin Top / Bottom
Side pin Top / Bottom
o1-15. 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.
Pinbalance Top / Bottom
-7-
n1-16. 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: l Luminance unit switch: cd/m2 l B.P.S. DIP switch: 9600 (1000) l Turn ON the color analyzer switch and press 0-CAL switch before use. 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) Receive a white window signal of MODE 5. 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 the automatic CUT-OFF adjustment starts. 7) Turn ON the R, G and B outputs on the signal generator 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) X: 0.283±0.008 Y: 0.297±0.008 The specified contrast range is 140±8cd/m2. 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. 12) Turn OFF and ON the Power Switch and you are in the User Mode. 13) Perform Reset and confirm the Brightness ranges are as follows: ONQ ON: 140±8cd/m2 OPQ OFF: 110±8cd/m2 Note: The adjustments above can be repeated by turning OFF and ON the Power Switch.
cd/m² fL Luminance unit switch
1 0 B. P. S. DIP switch
n 1-17. GRAY SCALE confirmation
1) Receive a 16-gradation gray scale signal of MODE 5. 2) 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 1-18. 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.
Brightness
VR502 ABL-ADJ
n 1-19. 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.
o1-20. SIGNAL SELECT confirmation
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.
o1-21. 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 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.
n 1-22. H-CONVERGENCE confirmation
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.
n 1-23. V-CONVERGENCE confirmation
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. -9-
n 1-24. RASTER REGULATION (DYNAMIC) confirmation
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
Back-raster
Picture W
FOCUS-B
n 1-25. FOCUS [PWB-MAIN]
1) Receive a green cross-hatch signal of MODE 5. 2) Adjust FOCUS-B VR of T501 (FBT) to make the vertical lines sharpest at points L, M and R as shown in Fig 1. 3) Adjust FOCUS-A 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-A 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-A 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.
B Thin
FOCUS-A
SCREEN
T501(FBT)
L
M
R
Fig.1
T Thin
M Thick
7) Confirm no focus variation on the entire screen.
Fig.2
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.
R M L Thick Thin Thick
Fig.3
1-26. 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. - 10 TL
T C B
TR
L
BL
R
BR
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 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. 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.
1-28. 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 -
Fig. 1
Double-click here
Fig. 2
Fig. 3
"Generic USB Hub" or "Iiyama USB Hub" - 12 -
n 1-29. 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 >
XV
< Side view >
PURITY MAGNET* 4-POLE MAGNET 6-POLE MAGNET
YV(a) XV CRT face
+ +
Yh(t) VCR
+
DEFLECTION YOKE
ê
SEPARATOR DIFFERENTIAL COIL
LOCKING RING BOW MAGNET
1-29-1. 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. 4) Receive an entire green signal. 5) Adjust the horizontal size to make it full-scan. 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. 7) Confirm that "H" reading of the landing meter is within ±20% at each point. 8) 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%. 9) Adjust Bottom-right, Top-right, Top-left and Bottom-left respectively 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% - 13 20mm
TL BL
T B
TR BR
20mm
1-29-2. STATIC CONVERGENCE adjustment
R
B R B
1) Receive a red and blue cross-hatch signal. 2) Adjust the 4-POLE MAGNET so that red and blue beams converge on the center cross lines. 3) Add green to the red and blue cross-hatch signal. 4) Adjust the 6-POLE MAGNET so that red and blue beams converge with green beam on the center cross lines. 5) Repeat the adjustment until red, blue and green beams converge each other. 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.
R,B G R,B
G
R,G,B R,G,B
1-29-3. 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. 4) Fix the BOW MAGNET with paint (090Z020A01).
R B
B R
1-29-4. DIFFERENTIAL COIL adjustment (XV adjustment)
1) Receive a red and blue cross-hatch signal. 2) Adjust the DIFFERENTIAL COIL so that the horizontal cross line converge each other.
R B
R,B
1-29-5. 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
- 14 -
1-29-6. VCR adjustment
1) Receive a white cross-hatch signal. 2) Adjust the specified VCR volume so that red, green and blue beams converge each other at the upper and lower edges of the horizontal line.
G R,B R,B G
R,G,B R,G,B
1-29-7. 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.
B
R
R,B
1-29-8. DIGITAL CONVERGENCE adjustments
1) Receive a red and blue cross-hatch signal. 2) Adjust the horizontal convergence (H-convergence) and the vertical convergence (V-convergence) with the front buttons so that red and blue beams converge. 3) Press the Input Select Button (VIDEO 1/2) so that the OSD as shown in the right hand side figure appears and the Digital H/V-convergence is enabled. 4) Confirm the horizontal/vertical convergence at the points: C0 to C8, B0 to B8, A0 to A8, D0 to D8, E0 to E8 in the right hand side figure. 5) If the horizontal/vertical line is diverged, select the adjustment point with the +/ Buttons and switch to X (H) or Y (V) with the MENU Button. 6) Press the +/ Buttons while the OSD is displayed to make red and blue beams converged. 7) Press the Input Select Button (VIDEO 1/2) so that the Digital H/Vconvergence is disabled. 8) Add green to the red and blue cross-hatch signal.
A0 B0 C0 D0 E0
X Y C 0 8 0
H V Point Setting
A1 B1 C1 D1 E1 A2 B2 C2 D2 E2 A3 B3 C3 D3 E3 A4 B4 C4 D4 E4
Points
A5 B5 C5 D5 E5
A6 B6 C6 D6 E6
A7 B7 C7 D7 E7
A8 B8 C8 D8 E8
- 15 -
1-29-9. SCREEN-CORNER MISCONVERGENCE correction
1) Receive a red and blue cross-hatch signal. 2) Affix a *ferrite sheet (890Z003A02/890Z003A03/800Z003A05) between SEPARATOR and CRT corresponding to the partially misconverged areas. Note: Must be careful not to affect distortion by this correction. 3) Fix the ferrite sheet with ACETATE-TAPE (890P306A10). Note: Only for 800Z003A02 and 800Z003A03)
10 10 Ferrite 10 Ferrite
R B B R RB BR
100 90 70
(in mm)
(890Z003A02) (890Z003A03) (890Z003A05)
*Ferrite sheet
- 16 -
2. TIMING CHART
Video
Sync B C A D E
H-parameters A: Total period B: Sync.width C: Back porch D: Active video E: Front porch
P
Q O
R
S
V-parameters O: Total period P: Sync.width Q: Back porch R: Active video S: Front porch
Mode VESA Timing Name
fH (kHz)
fV (Hz)
Sync polarity H N N P P P P P P V N N P P P P P P
Sync on Comp green
Horizontal (µsec) A 31.778 23.111 18.631 14.561 10.971 B 3.813 1.556 1.138 1.016 1.016 C D E 0.636 1.556 0.569 0.508 0.406 0.279 0.445 0.433 O 16.683 11.764 11.756 11.765 11.761 11.765 11.765 11.765 P
Vertical (msec) Q 1.048 0.578 0.503 0.524 0.483 0.433 0.529 0.525 R 15.253 11.093 11.179 11.183 11.235 11.294 11.204 11.210 S 0.318 0.023 0.019 0.015 0.011 0.009 0.007 0.007
- 17 -
1 2 3 4 5 6 7 8
640×480 640×480 800×600 1024×768
@ 60Hz @ 85Hz @ 85Hz @ 85Hz
31.469 59.940 43.269 85.008 53.674 85.061 68.677 84.997 91.146 85.024
1.907 25.422 2.222 17.778 2.702 14.222 2.201 10.836 1.422 1.325 1.078 1.010 8.127 6.972 5.625 5.278
0.064 0.069 0.056 0.044 0.033 0.028 0.023 0.021
1280×1024 @ 85Hz
1600×1200 @ 85Hz 106.250 85.000 1920×1440 @ 85Hz 128.520 85.000 2048×1536 @ 85Hz 137.020 85.000
9.412 0.837 7.781 0.633 7.298 0.577
3. IC APPLICATION
Ref No. Description Application H&V oscillator, Distortion / Size / Phase / DBF control, Variable B control Vertical deflection output S-correction switching Sub power control 5V output control Power factor control Main power control 12V regulator 12V regulator 12V regulator 3.3V regulator 5V regulator 5V regulator Sub microprocessor Main Microprocessor 5V watcher E2PROM (DATA) E2PROM (DDC) E2PROM (DDC) High voltage output control Video input switch H-sync and S.O.G. input switch Video pre-amplifier Video output On screen display control Cut-off control D/A converter Digital signal processor POWER-0P-AMP (TILT/NS-RRC control) POWER-0P-AMP (BL/BR control) POWER-0P-AMP (TL/TR control) POWER-0P-AMP (H/V-convergence control) AUDIO-AMP USB control E2PROM (USB) Terrestrial magnetic sensor - 18 Location (PWB) MAIN á á STAND á MAIN á á á STAND CORRECTION á MAIN STAND MAIN á á STAND á MAIN STAND á á á á á CORRECTION á á á á á STAND á á MAIN Deflection circuit IC350 UPC1888DCT IC401 LA7840L IC501 SLA5070 Power circuit IC901 STR-G6551 IC921 431 IC951 MC33260P IC952 3842 IC953 7712/2412 IC351 7812 IC205 7805 IC703 29M33 IC704 78M05 IC503 7805 Microprocessor circuit IC104 TMP47C24N IC301 TMP86PP11AN IC302 M51951BSL/KIA7045P IC303 24C08 IC102 24C21 IC103 24C21 High voltage circuit IC502 MSPAD383 Video & Sync processing circuit IC101 M61323SP-600 IC105 74LS157 IC201 CXA2153S IC202 LM2412T IC203 M35047-057SP/063SP IC204 LM240NA CRT circuit IC701 IC702 IC705 IC706 IC707 IC708 IC601 IC701 IC702 IC304 M62393P UPD61882 LA6510/TA8410AK LA6510/TA8410AK LA6510/TA8410AK STK391-110 AN7522 ISP1122 PCF8582C MIU-231
Additional function circuit
Note: Specifications of Microprocessor are on next page.
Main microprocessor specifications
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 Name GND X-IN X-OUT TEST Vcc CS7 CS1 RESET CS2 SIZE-PWM DEG CS3 CS4 CS5 CS6 H-LIN1 DRIVE1 X Y FUNNEL Vref GND 12MHz X'TAL 12MHz X'TAL GND 5V Function Pin 42 41 40 39 38 Name V-IN H-IN V-OUT H-OUT CLAMP Function V-SYNC signal input H-COMP / SYNC signal input V-SYNC signal output H-SYNC signal output Video clamp signal output
Cushion-S switching signal 7 output 37 Cushion-S switching signal 1 output 36 Reset PWM-H SIZE Degauss control signal output 35 Cushion-S switching signal 2 output 34
MODEL-SW Model no. switching MODEL-SW Model no. switching DDC-SDA DDC-SCL
2
DDC SDA DDC SCL
33 E PROM-SDA E2PROM SDA 32 E2PROM-SCL E2PROM SCL SDA SCL SUB-SO SUB-SI SUB-SCK H-LIN2 DRIVE2 DIAG DATA-OUT DATA-IN IIC SDA IIC SCL Sub microprocessor data-out Sub microprocessor data-in Sub microprocessor clock H-LIN2 switching signal output H-DRIVE2 switching signal output Automatic adjustment clock Automatic adjustment data input Automatic adjustment data output
Cushion-S switching signal 3 output 31 Cushion-S switching signal 4 output 30 Cushion-S switching signal 5 output 29 Cushion-S switching signal 6 output 28 H-LIN1 switching signal output Magnetism X detection Magnetism Y detection CRT funnel temperature detection 5V 27 25 24 23 22 H-DRIVE1 switching signal output 26
Sub microprocessor specifications
Pin 1 2 3 4 5 6 7 8 9 10 11 12 13 14 Name Vref KEY1 KEY2 TEMP NC VOLUME1 SOG SW PS1 SIG-SEL VOLUME2 VOLUME3 VOLUME4 LED VSS 5V Function Pin 28 Name VDD GND GND GND GND GND RESET X-OUT X-IN TEST SUB-SCK SUB-SO SUB-SI PS2 5V GND GND GND GND GND Reset 4MHz X'TAL 4MHz X'TAL N.C. Main microprocessor clock Data output Data input N.C. Function
Front key signal input (MENU/VIDEO) 27 Front key signal input (UP/DOWN/LEFT/RIGHT) 26 Surrounding temperature detection 25 N.C. Volume control 1 S.O.G. Switching signal ouput 24 23 22
Main power on/off control signal ouput 21 Video input terminal select signal output 20 Volume control 2 Volume control 3 Volume control 4 LED signal output GND 19 18 17 16 15 - 19 -
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-STAND. MAIN POWER circuit is a synchronous switching power supply circuit of primary output feedback with using control IC (IC952) and output FET (Q951). SUB POWER circuit is an asynchronous switching power supply circuit of secondary output feedback with using IC901 built-in output FET. Power supply start procedure is as follows;
Q Power switch is turned ON. R SUB POWER circuit (5V and 8.5V output) is turned on. S K901 (RELAY) is turned on. T POWER FACTOR circuit is turned on. U MAIN POWER circuit (83V, 32V, 16V and -12V output) is turned on. V Monitor is activated.
(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.
Q The full-wave rectified voltage waveform from D950 via PWB-STAND and smoothed voltage waveform from R The voltage waveform from R951 Q and R waveforms are compared at IC951. Q950 is turned off when R exceeds Q, and turned on when R is 0V. This repetition is to change input current to substantially sinusoidal waveform and it corrects harmonic distortion. The output voltage vary between 250V and 400V by input AC voltage and load current. 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. 70-250kHz.
C956.
- 20 -
(2) MAIN POWER circuit After the POWER FACTOR IC is activated, power source is supplied to 7 pin of IC952 (VCC) by start-up resister R958 and R959, and MAIN POWER circuit is activated. MAIN POWER circuit is supplied 25V auxiliary coil (detect coil) voltage between 8 and 9 pin of T951 (main transformer). The T951 primary auxiliary coil detects the load of 32V output voltage from the T951 secondary and controls the feedback current by fed back to 2 pin of IC952 (FB). The T951 secondary provides the following DC voltages:
Q 83V line: Supplied to the HIGH VOLTAGE OUTPUT (T501) and the VIDEO OUTPUT IC (IC202) and
the CUT-OFF IC (IC204) as power source.
R 32V line: S 16V line:
Supplied to the HORIZONTAL DEFLECTION OUTPUT (variable B voltage control) circuit and HORIZONTAL DRIVE circuit as power source. Supplied to the each 12V POWER CONTROL circuit, the CRT CORRECTION circuit and the VERTICAL OUTPUT IC (IC104, +) as power source. power source.
T 12V line: Supplied to the CRT CORRECTION circuit and the VERTICAL OUTPUT IC (IC104, ) as
83V
32V
16V
-12V
IC952 pin 4 output (2V/div) Q951 Drain output (200V/div)
- 21 -
(3) SUB POWER circuit When AC input is supplied to SUB POWER circuit, start-up resister R908 and R909 detect 4 pin of IC901 voltage (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. IC921 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 IC901 (OCP/FB). The T901 secondary provides the following DC voltages:
Q 8.5V line: Supplied to the Heater voltage IC (IC920) and the Audio-Amp (IC601) as power source. R 5V line:
Supplied to the Microprocessor (IC301 and IC104), USB-IC (IC701), SW-IC (IC101) and 5V CONTROL circuit as power source.
58kHz
IC901 pin 1 (Drain output) (100V/div)
IC901 pin 5 (OCP/FB input) (0.5V/div)
Note: Above waveform is switching waveform when USB peripherals are not connected.
- 22 -
(4) Power management modes When IC301 (main microprocessor) detects presence of horizontal and vertical sync 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. Mode Normal Sync signal H,V-Sync: ON PS1 LED HIGH (Green) LOW (Orange) Circuit All circuits are activated. Main power stops. (83V/32V/16V/-12V) Heater is off.
IC104 pin 8 IC104 pin 13 HIGH LOW
Power H or V-Sync: OFF Management H and V-Sync: OFF
The power consumption under the power management mode is 3W or less when USB peripherals or audio equipment are not connected.
4-2. SYNC SIGNAL PROCESSING circuit
The input signal from D-SUB connector is set input condition of VIDEO IN 1 / 2 and sync signal by IC101 (VIDEOSW-IC) and IC105 (SYNC-SW-IC), and input to pins 41 (H-IN) and 42 (V-IN) of IC301. The input H/V-sync signal is waveform-shaped and output from pins 39 (H-OUT) and 40 (V-OUT) of IC301, and then 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) S.O.G. switching signal: IC104 pin 9 LOW HIGH
Set SEP/COMP, S.O.G. by controlling pin 1 of IC105. Sync signal input SEP/COMP input S.O.G. input IC104 pin 7 LOW HIGH
NOTE: S.O.G. switching signal is switched to LOW level when the H/V-sync signal is off, and switched to HIGH level when COMP signal is input to pin 41 of IC301.
(3) The input sync signal to IC301 is processed by SYNC SIGNAL PROCESSING circuit in IC301 as follows:
Q Discriminate the input sync signal type: Separate / Composite R Discriminate the sync polarity: Positive / Negative S Detect the input sync signal presence T Count the frequency
Counting criterion: X'TAL 12MHz (X301) - 23 -
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 (UPC1888DCT) 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.
IC350 pin 26 H-sync input (2V/div)
IC350 pin 17 HD-OUT output (10V/div)
IC350 pin 18 AFC input (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.
IC350 pin 27 V-sync input (5V/div)
IC350 pin 4 sawtooth-wave output (2V/div)
IC401 pin 2 V-OUT output (20V/div)
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(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 L956, Q953 and D970 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. pin 14.
R Distortion: The parabolic wave (AC component) input to pin 11 is synthesized with the output pulse of
AC component ... Distortion
DC component ... H-size
IC350 pin 5 output (0.5V/div)
IC350 pin 26 H-sync input (5V/div)
IC350 pin 18 AFC input (5V/div)
IC350 pin 17 HD-OUT output (10V/div)
IC350 pin 14 Variable B control pulse (0.5V/div)
- 25 -
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.
Q504 Gate input (10V/div)
Q504 Drain output (20V/div)
Q503 corrector output (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 (IC501), and then correct linearity every frequency. Each switching point performs horizontal linear and distortion correction as follows:
IC301 output pin fH (kHz) 29.5 - 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 CS6 H-LIN1 H-LIN2 DRIVE CS1 CS2 CS3 CS4 CS5 (Pin 7) (Pin 9) (Pin 12) (Pin 13) (Pin 14) (Pin 15) (Pin 16) (Pin 26) (Pin 17) LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH LOW LOW LOW LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH HIGH LOW HIGH LOW LOW HIGH LOW LOW HIGH HIGH HIGH HIGH HIGH LOW HIGH LOW HIGH HIGH LOW HIGH LOW LOW HIGH HIGH HIGH LOW HIGH LOW LOW LOW LOW LOW LOW HIGH LOW HIGH HIGH LOW HIGH LOW LOW LOW LOW LOW LOW LOW LOW LOW HIGH LOW LOW LOW LOW LOW LOW LOW LOW LOW HIGH HIGH HIGH LOW LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH LOW LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH
97.1 - 115.0 HIGH 115.1-140.0 HIGH
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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 b y Q516 and Q517. It increases up to approx. 500Vp-p by T503 and synthesized with V-parabolic wave and then applied to pin 12 (DF) of T501 (FBT).
CRT cathode input (H period)
T501 (FBT) pin 12 input DBF horizontal element (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.
CRT cathode input (V period)
T501 (FBT) pin 12 input (200V/div)
- 27 -
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. The blanking signal is synthesized signal of V-BLK and H-BLK signals. 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:
Q Contrast R Sub-brightness S R/G/B drive T OSD contrast U D/A output voltage for the CUT-OFF circuit
Video output (5V/div) Video input (1V/div)
Clamp input (5V/div)
BLK input (5V/div)
(2) ABL DC voltage input to pin 7 of IC201 controls the amplitude of the video output signal. 0.5V: The amplitude of the video output signal is 0%. 4.5V: The amplitude of the video output signal is 100%. (ABL is not activated.) DC voltage is output by detecting the current input to T501 (FBT). This DC voltage controls the amplitude of the video output signal not to input more than specific current into FBT by inputing 7 pin of IC201.
(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.
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4-7. HIGH VOLTAGE CONTROL / OUTPUT circuit
The AFC pulse output from the HORIZONTAL DEFLECTION OUTPUT (L501) applied to pin 3 of IC502 (HV-CONT-IC) and then a control pulse synchronized with the frequency of the AFC pulse is output from pin 1 of IC502 and operate Q521 (HV-OUT). For stabilizing high voltage output control, this circuit is to detect a feedback voltage from pins 10 and 11 of T501 (FBT) and feed back to pin 4 of IC502, change the output duty of pin 1 of IC502, and control the high voltage change due to the brightness changes.
IC501 pin 4 AFC input (50V/div)
L501 AFC output (50V/div)
Q521 pin 1 H/V IC501 Gate inputoutput (20V/div) (20V/div)
Q521 Drain output (200V/div)
T501 pin 1 output (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 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: R X-RAY PROTECTION circuit: S ARC LIMIT circuit:
The voltage is 270V or more. The high voltage is 29.0kV or more. The beam current in FBT is 3.0mA or more.
- 29 -
4-9. CRT CORRECTION circuit
Following adjustment and functions are for CRT correction.
Q DYNAMIC/STATIC-CONVERGENCE R TILT-DY S NS-RRC T LANDING (TR/TL/BR/BL)
(1) DYNAMIC/STATIC-CONVERGENCE The control voltage (AC) from IC702 is amplified by IC708 and applied to CONVERGENCE-COIL built-in CRT deflection yoke. It makes any points of DYNAMIC-CONVERGENCE change. The DC voltage from pins 12 and 13 of IC701 is synthesized with the control waveform from IC702 and vary the DC component. It makes whole screen of STATIC-CONVERGENCE change. (2) TILT-DY DC voltage from pin 14 of IC701 is amplified by 7 pin of IC705 and applied to TILT-COIL of CRT deflection yoke. It makes CRT and DY tilt change. (3) NS-RRC DC voltage from 15 pin of IC701 is amplified by pin 3 of IC705 and applied to NS-RRC COIL. It makes discoloration caused by vertical direction magnetic field for CRT face detected by IC304 (Terrestrial magnetic sensor) on PWB-MAIN. (4) LANDING (4 corner coils) DC voltage from pins 4-7 of IC701 is amplified by pins 3 and 7 of IC706 and IC707, and applied to 4 corner coils. It makes discoloration caused by horizontal direction magnetic field for CRT face detected by IC304 (Terrestrial magnetic sensor) on PWB-MAIN, and CRT funnel temperature and surrounding temperature detected by temperature sensor.
- 30 -
4-10. AUDIO circuit
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 is active under the power management mode.
Level 0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 IC104 output pin Input Voltage IC601 pin 9 Pin 6 Pin 10 Pin 11 Pin 12 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 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 LOW LOW LOW LOW HIGH HIGH HIGH HIGH LOW LOW LOW LOW HIGH HIGH HIGH HIGH LOW LOW LOW LOW LOW LOW LOW LOW HIGH HIGH HIGH HIGH HIGH HIGH HIGH HIGH
4-11. 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. USB cable (series A/B) is composed of V, 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.
PC
IC701 (USB-CONT-IC)
Upstream × 1
Downstream × 4 (0.5A/1port)
Peripherals
- 31 -
5. SERVICE PARTS LIST
WARNING ! The components identified by " ! " in this manual are critical for safety. Replace only with part number specified . < Contents > -PageAbbreviations and Marks....................................................................................... 33 FAMILY-TREE.................................................................................................. 34 ASSY-PACKING............................................................................................. 34 ASSY-MONITOR................................................................................................. 35-36 ASSY-PWB-MAIN............................................................................................... 37-45 ASSY-PWB-STAND........................................................................................... 46-53 ASSY-PWB-CORRECTION................................................................................ 54-56 SUB-MATERIAL.................................................................................................. 57
< Structure >
FAMILY-TREE ASSY-PACKING ASSY-MONITOR ASSY-PWB-MAIN ASSY-PWB-STAND
ASSY-PWB-CORRECTION
SUB-MATERIAL
- 32 -
ELECTRICAL PARTS LIST < Abbreviations in PART section >
Abbreviation R-C R-MB R-FUSE C-C C-E C-PP C-MF D ZD TR PHC PTH HDT FBT VR SW SWT Resistor-Carbon Resistor-Metal Resistor-Fuse
Meaning
Capacitor-Ceramic Capacitor-Electrolytic Capacitor-Polypropylene Capacitor-Multilayer Metallized Polyester Film Diode Zener Diode Transistor Photo Coupler Positive Thermistor Horizontal Drive Transformer Flyback Transformer Variable Resistor Switch Switching Transformer
< Marks in DESCRIPTION section > < Resistor > Mark F J K Tolerance ± 1% ± 5% ±10% < Capacitor > Mark H J K M P Z Tolerance ± 3% ± 5% ± 10% ± 20% +100% 0% + 80% 20%
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