NEC DPro2070SB Service Manual
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NEC DPro2070SB Service Manual

NEC DPro2070SB Service Manual

Crt display nec-mitsubishi electric visual systems corporation september 2002
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SERVICE MANUAL
CRT DISPLAY
DPro2070SB / DPro2070SB-BK
(C22BW711)
NEC-MITSUBISHI ELECTRIC VISUAL SYSTEMS CORPORATION
SEPTEMBER 2002
CBB-S5784

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Summary of Contents for NEC DPro2070SB

  • Page 1 SERVICE MANUAL CRT DISPLAY DPro2070SB / DPro2070SB-BK (C22BW711) NEC-MITSUBISHI ELECTRIC VISUAL SYSTEMS CORPORATION SEPTEMBER 2002 CBB-S5784...
  • Page 2 X-RADIATION WARNING The surface of pucture tube may generate X-Radiation. Precaution during servicing, and if possible use of a lead apron or metal for shielding is recommended. To avoid possible exposure to X-Radiation and electrical shock hazard, the high voltage compartment and the picture tube shield must be kept in place whenever the chassis is in operation.

  • Page 3: Table Of Contents

    Contents 1. Circuit description ..........................1-1 1.1 Power block ..........................1-1 1.1.1 Outline ........................... 1-1 1.1.2 Rectifying circuit and higher harmonics suppression (active filter) circuit ..........................1-1 1.1.3 Sub power circuit ......................1-2 1.1.4 Main power circuit ......................1-2 1.1.5 Demagnetizing circuit ....................1-2 1.1.6 Power management circuit ..................
  • Page 4 1.4 CRT compensation block ....................1-10 1.4.1 Earth magnetism cancel circuit ................1-10 1.4.2 Rotation circuit ......................1-10 1.4.3 East-west horizontal magnetic field vertical position canceling function ....................1-11 1.4.4 Corner purity circuit ....................1-11 1.4.4.1 Corner purity circuit operation ..............1-12 1.4.5 Vertical magnetic field landing cancel circuit ............
  • Page 5 1.7.6 Short-circuit protection circuit on secondary power side ........1-23 1.7.7 Overvoltage protection circuit .................. 1-23 1.8 Adjustment ..........................1-24 1.8.1 Adjustment mode ....................... 1-24 1.8.2 User mode (Normal mode) ..................1-24 1.8.3 Factory mode ......................1-27 1.8.3.1 How to entering to Factory mode .............. 1-27 1.8.3.2 How to cancel Factory mode ..............
  • Page 6 2.4.6 Adjusting the RGB drive signal ................2-13 2.4.6.1 Adjusting GN1 (GAIN-H) (adjustment of 9300K) ........2-13 2.4.6.2 Adjusting ABL ....................2-15 2.4.7 Adjusting the focus ....................2-15 2.4.8 Adjusting the convergence ..................2-16 2.4.8.1 Adjusting with ITC ..................2-16 2.4.8.2 Adjusting DDCP ..................
  • Page 7 2.7.4 Packaging ........................2-35 2.8 Degaussing with handy-demagnetizer ................2-36 2.8.1 General precautions ....................2-36 2.8.2 How to hold and use the handy-demagnetizer ........... 2-36 2.9 Caution ..........................2-36 2.10 Timing chart ........................2-37 2.11 Adjustment timing ......................2-38 Trouble shooting Wave form Schematic diagram Removal instruction sheet...

  • Page 8: Circuit Description

    1. Circuit description 1. 1 Power block 1.1.1 Outline The power block is compatible with the business electric power, 100 to 120VAC/220 to 240VAC (50/60Hz). The active filter circuit is adopted to suppress the higher harmonic current. The circuit block is composed of two switching regulators, the main power which is the configuration used the flyback converter system of pseudo resonance operation and the sub power which is the configuration used PWM (pulse wise modulation) system.

  • Page 9: Sub Power Circuit

    1.1.3 Sub power circuit When the power switch is turned ON, the rectified and smoothed DC voltage (AC voltage x √2) is supplied to pin 5 of IC903, and is charged to C930 through pin 1. When pin 1 reaches 5.7V, oscillation is started in IC903, and the built-in output FET is put into operation to add the pulse voltage between pin 5 and pin 3 on the primary side of T902.

  • Page 10: Deflection Processor Block

    1.2 Deflection processor block 1.2.1 Deflection processor (IC601) Deflection processor IC601 horizontally compensates wise, position and distortion, and vertically controls heights, position and linearity. IC601 automatically tracks the frequency to output the appropriate horizontal/vertical drive pulse. IC601 also outputs the horizontal parabola waveform for focus and the waveform for convergence compensation.

  • Page 11: Vertical Output Amplification Circuit

    IC601 R652 VSAW-P R658 R648+R649 IC603 R645+R646 R650 VSAW-N R642 R647 IC603 R651 C628 IMID Q604 SW-VLIN1 R637 SW-VLIN2 Q603 Fig. 2 Vertical sawtooth waveform output circuit 1.2.4.2 Vertical output amplification circuit A current proportional to the waveform of the voltage input to IC401 will flow to the vertical deflection coil (V-DY).

  • Page 12: Dbf (Dynamic Beam Focus) Circuit

    1.2.6 DBF (Dynamic Beam Focus) circuit The horizontal/vertical DBF voltage is respectively generated and amplified, then synthesized at T7A1. As for the horizontal DBF voltage waveform, the parabola waveform voltage (approx. 0.5Vp-p) is output with IC601, and amplified about 10 times with OP-AMP IC6A2. After that, it is amplified to 50-60Vp-p with Q7B5 (the amplification factor is about 10 times), then it is amplified about 10 times with T7A1.

  • Page 13: Video Block

    1.3 Video block 1.3.1 Video signal amplifier circuit D-SUB IC 601 CN216 IC102 IC 215 IC 210 Retrace CLP-IN BLK in MAIN D-SUB IC 211 CN215 Pre - Amp B OSD IC212 G OSD R OSD R-Bias B-Bias G-Bias S/G SEL OSD BLK IC 216 Analog-sw...

  • Page 14: Cut-Off Control Circuit

    1.3.2 Cut-off control circuit IC210 IC211 MAIN-Amp Pre-Amp 215V LINE R250G R250B R250R 12V LINE D250G D250B D250R Q251G D251G D251B D251R C250G Q251B C250B Q251R Q250G C250R Q250B Q250R IC213 IC102 BRIGHT Fig. 5 Cut-off control circuit The cut-off control circuit consists of Q250R, Q250G, Q250B, Q251R, Q251G, and Q251B, and simultaneously adjusts 3 colors (brightness), or individually adjusts 3 colors (biases of R, G, and B).

  • Page 15: Input Change Circuit

    1.3.4 2 Input change circuit The analog switch IC216 carries out the signal selection at the time of SIGNAL-A and B simultaneous input. The signal selection is carried out by the SELECT signal of pin 3 of microcomputer IC102. By the SELECT signal of pin 3, the input signal of SIGNAL-A is selected when pin 13 (SELECT SW) of the analog switch IC206 is HIGH, and SIGNAL-B is selected when pin 13 (SELECT SW) of the analog switch IC206 is LOW.

  • Page 16: Circuit (Cathode) Operation In Selecting Sb Mode [Window Pattern]

    Back raster luminance GAIN UP γ compensation Sharpness SUPER BRIGHT MODE Normal Normal SUPER BRIGHT MODE-1 Normal Presence SUPER BRIGHT MODE-2 Presence Presence 1.3.8.2 Circuit (cathode) operation in selecting SB Mode [Window pattern] SUPER BRIGHT MODE SUPER BRIGHT MODE-2 SUPER BRIGHT MODE-1 ccordance Same amplitude Amplitude: Approx.

  • Page 17: Constant Brightness Function

    (*5): R/G/B GAIN MAX value is the maximum one among GAIN adjustment value mentioned (*3) above.  EEP address (hex)   MAX GAIN * Every R/G/B MAX GAIN data applied to the address listed above table are totally same. In case of repair, after CRT, Pre-AMP (IC211), MAIN-AMP (IC210), etc. are replaced and the luminance/color coordination is adjusted, the MAX GAIN value mentioned above should be rewritten.

  • Page 18: East-West Horizontal Magnetic Field Vertical Position Canceling Function

    0 to 5V with the reference of 2.5V by IC102 pin 45 (PWM_DAC), and DC current of +/-100mA (max) is made to flow to the rotation coil by IC804 pin 2. This compensation circuit has two functions; (1) User adjustment (OSM display) and (2) Southern/Northern horizontal magnetic field rotation cancellation.

  • Page 19: Corner Purity Circuit Operation

    1.4.4.1 Corner purity circuit operation <TL: Upper left corner> Pin 50 (PWM_DAC) of IC102 controls the TL in the range of 0 to 5V while regarding 2.5V as the reference voltage, and the DC current of the above value will flow from pin 2 of IC803 to the upper left corner purity coil.

  • Page 20: Production Of Compensation Current Waveform

    1.4.6.1 Production of compensation current waveform There are 30 kinds of compensation elements, and they are programmed in IC601 one by one using the function. Inputting the compensation coefficient into the function controls the amplitude of the current.                Fig. 6 DDCC compensation image Examples of the functions and current waveform/compensation operation of YH (YHTT, THTB, YHJT, YHJB) are shown as follows.

  • Page 21: Block Diagram

    Though DC current is superimposed on the sub yoke, H-STATIC and V-STATIC are pushed to the greatest possible extent by the adjustment with CP ring in order to reduce the stress of the driver IC8A1 (STK391- 110). Moreover, although 6H coil is carried in the case of this chassis, in addition to 4H and 4V coils, since the range which can be adjusted is a range used as fine adjustment, it is a premise that the convergence between Red, Blue and Green (6H and 6V) is in a standard as a performance of ITC (CRT&DY) in the state where 6H coil is not used.
  • Page 22               Fig. 7 The principle of DDCC compensation 1-15...
  • Page 23 Fig. 8 (a) DDCC adjustment item 1-16...
  • Page 24 Fig. 8 (b) DDCC adjustment item 1-17...
  • Page 25 Fig. 9 DDCC circuit diagram 1-18...

  • Page 26: East-West Horizontal Convergence Canceling Function

    1.4.7 East-west horizontal convergence canceling function It is the function which rectifies automatically change of YHJT, YHJB and XVL, and XVR (between Red and Blue) by east-west magnetic field change, detects the detection voltage change from IC2S0 (geomagnetism sensor unit), and is carrying out automatic compensation. 1.5 USB circuit 1.5.1 Outline This monitor loads the standard USB SELF POWERED HUB with 1 upstream and 4 downstreams.

  • Page 27: Control Block

    1.6 Control block 1.6.1 Function of control circuit The control block is mainly on MAIN board and DEFL-SUB board, and the function is as follows. (1) Auto-tracking (2) Control of picture size, distortion and position (3) Adjustment data memory (4) Sync. signal detection (5) OSM control (6) Video pre-amp control and clamp pulse position control (7) Power ON/OFF control...

  • Page 28: High Voltage Data Error Detection

    1.6.6.2 High voltage data error detection Important safety data, such as the high voltage adjustment value and the X-ray protector activation voltage, are stored in the EEPROM. For each safety data, there is backup data. If both data values differ from each other, the monitor will enter the power saving mode (the high voltage will not be applied).

  • Page 29: Microcomputer Pin Assignment

    1.6.6.7 Microcomputer pin assignment PORT ASSIGN FUNCTION PORT ASSIGN FUNCTION H_LOCK IRQ2/P40 H_UNLOCK detection 64 CS8 CS switching 8 USB-SPARK IRQ1/P41 I/O For FLASH writing 63 CS7 CS switching 7 USB-RESET INPUT SEL IRQ0/P42 Power cut detection 62 CS6 CS switching 6 RD/P43 SOA output 61 CS5...

  • Page 30: X-Ray Protection Circuit And Safety Protection Circuit

    1.7 X-ray protection circuit and safety protection circuit 1.7.1 X-ray protection circuit This circuit prevents X-ray radiation from exceeding the dangerous level due to the abnormal rise of high voltage. Do not modify the high voltage circuit and the safety protection circuit. The upper limit of the high voltage value and the beam current value are determined by the X-ray radiation upper limit curve of CRT.

  • Page 31: Adjustment

    1.8 Adjustment 1.8.1 Adjustment mode This monitor has the following adjustment modes. (1) User mode (Normal mode) (2) Factory mode (Factory adjustment mode) 1.8.2 User mode (Normal mode) This is the mode user executing the adjustment and setting. When pressing button of EXIT, (<), (>), (-), (+) and SELECT on the front panel, the following menu picture is displayed on the screen.
  • Page 32 OSM menu (User mode) Adjustment Item Item Group icon icon − ＋ To decrease the  BRIGHTNESS To increase the brightness. brightness. CONTRAST To decrease the contrast. To increase the contrast. To eliminate possible DEGAUSS color shading or impurity. Group 1 Activates the constant CONSTANT BRIGHTNESS brightness function.
  • Page 33 Adjustment Item Item Group icon icon − ＋ Reduces the Increases the m oire MOIRE CLEAR value. m oire value. The red moves to The red moves to the CONVERGENCE (HOR.) the left side of the right side of the green. green.

  • Page 34: Factory Mode

    1.8.3 Factory mode This mod can adjust all of items, and also change the factory default adjustment data (reset data). 1.8.3.1 How to entering to Factory mode The setting of the factory mode is executed by the following procedures. (1) Power ON with EXIT button pressed, and confirm that the following OSM picture appears. H2 - - - - O W - - - - 01 FACT DATA (3) Press (-) button once to set the data value to 255.
  • Page 35 (2) Press the (-) button to set the data value to '250'. (3) Press the (SELECT) key to enter the FACTORY-HV mode. (4) Press the (>) or (<) button. The FACTORY-HV mode will be canceled. 1- 28...

  • Page 36: Adjustment Procedure

    Adjustment procedure Measuring instruments (1) Signal generator A: Astro Design VG-812 or equivalent (2) Signal generator B: Astro Design VG-829 or equivalent (3) DC voltmeter: 150V 0.5 Class or digital voltmeter (4) High voltage meter: 0.5 Class that can measure 40KV (5) Luminance meter: Minolta color analyzer CA-100 or equivalent (6) AC voltmeter:...

  • Page 37: Names Of Each Monitor Part

    Names of each monitor part 2.3.1 Configuration of front control panel a：Power button b：Power indicator c：EXIT button d：CONTROL (Item select) buttons e：CONTROL (Adjust) buttons f ：SELECT S/B MODE button g：RESET/ INPUT SELECT button b  a Figure 1 Front control panel 2.3.2 Configuration of rear input connector (signal input) a) Signal input connector b) USB connector Shrink D-SUB 15P×2 (UP) (DOWN)×4 INPUT 1 INPUT 2 2 - 2...

  • Page 38: Osm Display Matrix

    ○ 45SEC OSM LOCK OUT ○ ON/OFF IPM OFF MODE ○ ENABLE/DISABLE ENABLE EDGE LOCK ○ FRONT/BACK BACK HOT KEY ○ OFF/ON FACTORY PRESET < + > OSM group USER7 DISPLAY MODE MONITOR INFO DPro2070SB REFRESH NOTIFIER ○ OFF/ON 2 - 3...

  • Page 39: Factory Mode

    IPM OFF MODE ENABLE/DISABLE ENABLE ○ ○ FRONT/BACK BACK EDGE LOCK OFF/ON HOT KEY ○ < + > FACTORY PRESET OSM group USER7 DISPLAY MODE DPro2070SB MONITOR INFO OFF/ON REFRESH NOTIFIER ○ USA/EUR USA: for North America DESTINATION EUR: for Europe 2 - 4...
  • Page 40 Setting contents Default setting Setting classification Adjustment items By timings Common FACT 1 0(0FF)/1(ON) C-PURITY-DIS CPDIS 1(ON) ○ 0(0FF)/1(ON) PURITY-DIS PRDIS 1(ON) ○ PRO(EEh) MAG-ZERO-HV HVZER 000 〜 0FF V-CANCEL V-PUR ○ 000 〜 0FF HPR-G ○ H-CANCEL 000 〜 7F DBFV2 TOP DBF2T ○...
  • Page 41 Setting contents Setting classification Adjustment items By timings Common R-GAIN-H R-GN1 000 〜 0FF ○ 000 〜 0FF ○ G-GAIN-H G-GN1 000 〜 0FF ○ B-GAIN-H B-GN1 000 〜 0FF R-GAIN-M R-GN2 ○ 000 〜 0FF G-GAIN-M G-GN2 ○ B-GAIN-M B-GN2 000 〜...

  • Page 42: Adjustment

    Adjustment 2.4.1 How to select the factory adjustment (FACTORY) mode 2.4.1.1 Selecting with front panel switches (1) Turn the power ON while holding down EXIT button. (2) After step (1), release EXIT button after one to two seconds. (3) Confirm that 255 is displayed for the counter of FACT DATA on OSM display. (4) Set to 05 with (+) button.

  • Page 43: Focus Adjustment (Rough Adjustment)

    2.4.2.2 FOCUS adjustment (Rough adjustment) (1) Set the brightness so that the raster can be confirmed with the FBT picture potentiometer (screen VR). (2) Adjust the focus pack "FOCUS 1, 2" so that both edges of the picture are clear. 2.4.2.3 Shock test (1) Display the "color bar"...

  • Page 44: Adjusting The Landing (Itc/4 Corner Purity Adjustment)

    OWN  H2-OW-**  2.*.**  (Initial data file name) 2.4.2.5 Adjusting the landing (ITC/4 corner purity adjustment) Adjustment mode/set Imput signal/pattern Adjustment item Status No. 12:106.25kHz / 85Hz, 1600x1200 landing indicator Full green (1) Input the timing No. 12 (106. 25kHz/85Hz, 1600x1200) full green signal. (2) Turn OFF the monitor power to carry out hand degaussing.

  • Page 45: Adjusting The Left/Right Distortion, Picture Width, Picture Position

    2.4.3.3 Adjusting the left/right distortion, picture width, picture position (LEFT/RIGHT) and vertical linearity (all preset) (1) Set DOWN/UP of the user mode to 50%. <Setting in the factory mode with the following steps> (2) Adjust the vertical size to approx. 297mm, and the vertical position to the approximate center.

  • Page 46: Adjusting The Cut Off

    Horizontal parabola wave DBF-H-PHASE The center of the horizontal  parabola waveform and  Image signal center of the image signal  waveform must match. DBF-H-AMP / PHASE adjustment (3) Set the output of the signal generator to crosshatch (white/normal). (4) Set OSM to the select picture of HFOCD (DBF-H-PHASE) in FACT1, and adjust the focus balance of point 1 and point 3 in the above figure using (-) (+) buttons. * (3) and (4) should be carried out with all preset timing.

  • Page 47: Adjusting Bs2 (Bias-M) / Bs3 (Bias-L)

    <In case pre-adjustment before aging is not carried out > (1) Input timing No. 12 (106.25kHz/85Hz, 1600x1200) with the signal generator (R, G and B OFF). (2) Set each adjustment item to the following value. BRIGHTNESS : 7F (FACT3) R-BS1(R-BIAS-H) : 00 G-BS1(G-BIAS-H) : 8A...

  • Page 48: Setting Constant Brightness Circuit (Factory Mode)

    2.4.5 Setting CONSTANT BRIGHTNESS circuit (Factory mode) Note) This operation should be carried out after the adjustment of cut-off. In addition, heat- running should be fully carried out. 2.4.5.1 Reading beam current default data (1) Input timing No. 12 (106.25kHz/85Hz, 1600x1200) crosshatch signal with the signal generator. (2) Select CONSTANT BRIGHTNESS and push (-) button, then it starts to read the beam current default data.
  • Page 49 (8) Adjust GN2 (GAIN-M) and GN3 (GAIN-L) to the specified value listed in the following table in the same manner as GN1 (GAIN-H). COLOR TEMPERATURE GN1 (GAIN-H) GN2 (GAIN-M) GN3 (GAIN-L) TOLERANCE Color temperature (9300K)  (6500K)  (5000K)  Full green luminance 77.0 66.0  54.0  ±1.0  Full White 0.283  0.313  0.345 ...

  • Page 50: Adjusting Abl

    2.4.6.2 Adjusting ABL Adjustment item Adjustment mode/set Imput signal/pattern Status Factory No. 12:106.25kHz / 85Hz, 1600x1200 indicator Full white (1) Input the following adjustment timing with the signal generator. Pattern: Full white (input amplitude = 0.7Vp-p) Adjustment timing: No.12 (106.25kHz/85Hz, 1600x1200) (2) Select ABLAJ (ABL) with OSM, and adjust to 115cd/m +/- 5.

  • Page 51: Adjusting The Convergence

    (6) After inputting check timing No. 5 in user mode and operates AUTO-ADJUST function, confirm the focus with "e" character pattern in reverse. If "e" character is indistinct, repeat step (1) to readjust. *Adjustment votlage max value: DBF-H-AMP H width: 396mm: 430V DBF-V-AMP V width: 297mm: 200V The focus is judged as follows.
  • Page 52 Adjusting the center misconvergence and axial misconvergence Problem Adjustment point Adjustment procedure Adjustment item name H-STATIC Adjust to +/- 0.1mm or less with CP-ASSY 4P. V-STATIC Adjust so that TOP+BOTTOM YH axial deviation are +/- 0.1mm or less with YH volume.

  • Page 53: Adjusting Ddcp

    2.4.8.2 Adjusting DDCP (1) Input the timing No. 12 (106.25kHz/85Hz,1600x1200) crosshatch pattern. (2) Enter the factory mode. (3) Adjust in the following order. (It is assumed that the center and axial misconvergence on the previous page have already been adjusted.) Adjustment Problem Adjustment point...
  • Page 54 Adjustment Problem Adjustment point Adjustment procedure Adjustment item name order 4H-COIL S3H(Top Left) S3H-TL Adjust to 0.3mm or less. S3H(Top Right) S3H-TR Adjust to 0.3mm or less. S3H(Bottom Left) S3H-BL Adjust to 0.3mm or less. S3H(Bottom Right) S3H-BR Adjust to 0.3mm or less. PQH (Top Left) PQH-TL Adjust to 0.3mm or less.
  • Page 55 Adjustment Problem Adjustment point Adjustment procedure Adjustment item name order 4H-COIL PQH-BL Adjust to 0.3mm or less. PQH (Bottom Left) Adjust to 0.3mm or less. PQH-BR PQH (Bottom Right) Adjustment Problem Adjustment point Adjustment procedure Adjustment item name order 4V-COIL Adjust to 0.05mm or less.
  • Page 56 Adjustment Problem Adjustment point Adjustment procedure Adjustment item name order 4V-COIL XV(Left) XV-L Adjust to 0.1mm or less. XV(Right) XV-R Adjust to 0.1mm or less. S3V(Top Left) S3V-TL Adjust to 0.3mm or less. S3V(Top Right) S3V-TR Adjust to 0.3mm or less. S3V(Bottom Left) S3V-BL Adjust to 0.3mm or less.
  • Page 57 Adjustment Problem Adjustment point Adjustment procedure Adjustment item name order 4V-COIL PQV (Top Left) PQV-TL Adjust to 0.3mm or less. PQV (Top Right) PQV-TR Adjust to 0.3mm or less. PQV-BL Adjust to 0.3mm or less. PQV (Bottom Left) PQV-BR Adjust to 0.3mm or less. PQV (Bottom Right) Specify the adjustment value range of the following adjustment items in general DDCP adjustment.

  • Page 58: Default Settings (With Factory Mode)

    2.4.9 Default settings (With factory mode) Adjustment mode/set Imput signal/pattern Adjustment item Status Factory mode Each adjustment timing Default settings indicator (1) Set the default values as shown in the table (user mode) given in OSM display (Refer to 2.3.2.1 User mode). If the setting class is an item with each timing, carry out with each adjustment timing.

  • Page 59: Inspections (In Normal Mode)

    Inspections (In normal mode) Adjustment mode/set Imput signal/pattern Adjustment item Status Normal mode Inspections indicator 2.5.1 Electrical performance Inspect the electrical performance after confirming that the contrast is set to MAX and the bright is set to center (by pressing (-) (+) buttons simultaneously). After inspection, carry out FACTORY PRESET operation.

  • Page 60: Confirming The Global Sync (Corner-Purity) Function

    2.5.1.5 Confirming the GLOBAL SYNC (CORNER-Purity) function Confirmation timing Timing No. 12 (106.25kHz / 85Hz, 1600x1200) Input a (full white display), and press (-)(+) buttons to change GLOBAL SYNC (TR/TL/BR/BL). Confirm that the color coordination around the picture changes. 2.5.1.6 Focus, picture performance Adjustment mode/set Imput signal/pattern...

  • Page 61: Picture Distortion

    2.5.1.8 Picture distortion When the picture distortion is measured, each distortion of the preset timing must be less than the following values. <Picture performance inspection items> Inspect the following items for the picture distortion. Item Judgement reference value Input signal 4-corner section distortion Inspect the distortion at the four corners.
  • Page 62 Item Judgement reference value Input signal Line curve (crosshatch pattern outer contour) x 1.0mm Crosshatch y 1.0mm pattern x: Curve within 50mm range (horizontal) y: Curve within 50mm range (vertical) Horizontal trapezoid (top/bottom), vertical trapezoid (left/right) Bezel y=|y1-y2| • y 2.0mm x=|x1-x2| x 1.8mm Control with the above...

  • Page 63: Linearity

    Item Judgement reference value Input signal Distortion Must be within the following frame.* (Note, excluding ROTATION) 2.0mm Crosshatch 2.0mm pattern Picture position Specified H width |L1-L2| 5.0mm Full white Display picture |L3-L4| 3.0mm Specified V width Phosphors surface 2.5.1.9 Linearity Measure the linearity with a 17 horizontal line x 13 vertical line crosshatch.

  • Page 64: Adjustment Value List

    2.5.1.10 Adjustment value list The horizontal width, vertical width and DBF-H/V amplitude must be within the following ranges. Timing Horizontal width (mm) Vertical width (mm) DBF-H amplitude (H) DBF-V amplitude (V) Adj. value Adj. value Max. Adj. value Max. Adj. value Standard Adj.

  • Page 65: Confirming Edgelock And Sync Green

    2.5.1.11 Confirming EDGELOCK and SYNC ON GREEN Confirm that the following criterion is satisfied when timing No. Check 1 (35kHz/66Hz) with full white. <Criterion> The back raster color coordination should vary when the setting is changed to BACK from FRONT. 2.5.1.12 Checking the functions during Composite Sync input Adjustment item...

  • Page 66: Confirming Rotation Compensation Function

    2.5.1.16 Confirming ROTATION compensation function Confirm that the picture rorates by changing ROTATE. 2.5.1.17 Luminance/color coordination uniformity Adjustment mode/set Imput signal/pattern Adjustment item Status No.12: 106.25kHz / 85Hz, 1600x1200 Lluminance/color indicator coordination uniformity The luminance ratio between the center and periphery must be 80% or more with timing No. 12 (106.25kHz/85Hz, 1600x1200) COLOR 1.

  • Page 67: Confirming Auto-Adjust Operation

    Confirmation of γ compensation Confirmation of outline compensation 2.5.1.21 Confirming AUTO-ADJUST operation (Timing No. 29 (137kHz/85Hz, 2048X1536)) (1) Select AUTO ADJUST with OSM in user mode, and press (+) button. (2) Confirm that AUTO ADJUST function operates and the crosshatch frame should be within phosphor area. Phosphor area Image area Crosshatch frame...

  • Page 68: Ddc Function, Check Of Asset Management

    DDC function, check of asset management This writing operation should be carried out with the service tool (refer to the followings for detail of service tool). The version of the service tool software used is as follows. Service tool S/W folder name: SVT312NM211 Service tool S/W version: Ver3.12-2.1-1 Be sure to read “Read me first”...

  • Page 69: Ddc Write Data Contents

    2.6.1 DDC write data contents The contents of DDC write data must be as follows. EDID DATA DUMP HEX Established Timings: Detailed Timing (block #1): 00 FF FF FF FF FF FF 00 720x400 @ 70 Hz ---Preferred Timing Mode--- 34 AC 32 46 SN SN SN SN 720x400 @ 88 Hz Pixel Clock: 229.50 MHz...

  • Page 70: Self-Diagnosis Shipment Setting

    2.6.2 Self-diagnosis shipment setting The shipment settings for self-diagnosis data area (region) are given below. Shipment Setting (H) LABEL NAME 0x08C to 0x08F Heater operating time 0x00 0x0B6 to 0x0B9 Operating time 0x00 0x0C0 0x00 High voltage error rate 0x0C1 0x00 High voltage suspension rate 0x0C2...

  • Page 71: Degaussing With Handy-Demagnetizer

    Degaussing with handy-demagnetizer 2.8.1 General precautions (1) Carry this procedure out with the monitor power ON. (2) When degaussing with handy-demagnetizer, the demagnetizer power must be turned ON and OFF at a position at least 1m away from CRT tube. (3) Use a bar type demagnetizer instead of a ring type.

  • Page 72: Timing Chart

    2.10 Timing chart [H-SYNC] [VIDEO] Video signal level Set Up nsignal level [V-SYNC] [VIDEO] ※Refer to after the next page for the preset timing details. 2 - 37...

  • Page 73: Adjustment Timing

    2.11 Adjustment timing 2 - 38...
  • Page 74 2 - 39...
  • Page 75 3. TROUBLESHOOTING  This chapter for troubleshooting is useful if any normal conditions cannot be secured even after the confirmation of “Troubleshooting” presented in the User’s Manual and the completion of “Chapter 3. Adjustment procedures” presented in this Service Manual. The equipment units related to the possible cause of “Picture bounces or a wavy patterns is present in the picture “...

  • Page 76: No Raster Generated

    3.1 No Raster Generated Check the LED (Power-On Indicator). When the LED blinks in ORANGE→Check for “3.4.9 Self-Diagnostic Functions”. Measure the voltage between Pins 6 (HS) Check the HS and VS lines. The LED is lit in and 5 (VS) of CN103 on the MAIN PWB. ORANGE Horizontal period (HS) Vertical period (VS)
  • Page 77 CONTINUE  Is the high voltage maintained at approx. 27kV? Expected failure point 1) IC701, Q701 or peripheral circuit 2) T701 (FBT), C726, R720 or peripheral circuit  Measure the R/G/B video output at Pins R, G and B of CRT socket. Check the R/G/B video output.

  • Page 78: Abnormal Picture

    3.2 Abnormal Picture 3.2.1 Raster Brightness Failure   Measure the voltage at CN201 on the CRT PWB. .  Check the screen voltage   Usually the screen voltage is 600 to 800V       Expected failure point T701 (FBT), CRT socket or screen leads  ...

  • Page 79: Sync Failure

    3.2.3 Sync Failure 3.2.3.1 Horizontal Sync Unstable  Check the waveform at Pin 36 of IC102 on the MAIN Check the horizontal sync signal.  Horizontal PWB (Approx. 5Vp-p). period Check the (H-SYNC) waveform at Pin 6 of Check the horizontal sync signal. CN103 on the MAIN PWB.

  • Page 80: Vertical Sync Unstable

    3.2.3.2 Vertical Sync Unstable Check the vertical sync signal.  Check the (V-SYNC) waveform at Pin 33 of IC102 on the MAIN PWB. (Approx. 5Vp-p) Check the vertical sync signal.  Check the (V-SYNC) waveform at Pin 5 of CN103 on the MAIN PWB (Approx. 5Vp-p). Vertical period Expected failure point...

  • Page 81: Screen Size And Screen Position Failure

    .4 Screen Size and Screen Position Failure 3.2.4.1 Horizontal Size Failure Examine the duty factor of the voltage waveform observed at Pin 9 of IC5C0 on the Check the voltage at Pin 9 of IC5C0. MAIN PWB and confirm whether it is changed by the adjustment of horizontal size. Expected failure point  ...

  • Page 82: Horizontal Position Failure

    3.2.4.2 Horizontal Position Failure   (1)Video Confirm that the phase of the voltage waveform at Pin 11 of CN601 on the MAIN PWB Check the H_POSI line.   changes when the horizontal position is adjusted with OSM.     Expected failure point  ...

  • Page 83: Linearity Failure

    3.2.5 Linearity Failure 3.2.5.1 Horizontal Linearity Failure    Check voltage at Pins 57-64 of IC102 on the MAIN PWB. Check the horizontal frequency band selector.   Preset 64pin 63pin 62pin 61pin 60pin 59pin 58pin 57pin [kHz] Q562 Q561 Q566 Q565 Q568 Q567 Q563 Q564 31.5  ...

  • Page 84: Vertical Linearity Failure

    3.2.5.2 Vertical Linearity Failure   Check how the voltage waveform at Pin 15 of CN600 on the MAIN PWB changes to the Check Pin 15 of CN600. shape of Character C when up and down balance control is carried out for OSM linearity.  ...

  • Page 85: Distortion Compensation Circuit Failure

    3.2.6 Distortion Compensation Circuit Failure 3.2.6.1 IN/OUT (pincushion), ALIGN (trapezoidal) and TOP/BOTTOM (corner correction) Failure    Check the output waveform at Pin 12 of CN600 on the MAIN PWB. Check the voltage at Pin 12 of CN600. Confirm that the waveform changes to parabola form when IN/OUT is selected by the OSM.  ...

  • Page 86: Focus Failure

    3.2.7 Focus Failure Does the focus become optimal in the center of the screen when the focus VR of the FBT is adjusted? Measure the high voltage. Usually it is maintained at 27±0.5KV. Check the high voltage (HV).   Measure the screen voltage at CN201 on the CRT PWB.
  • Page 87 CONTINUE  The horizontal waveform is inadequate. Check the voltage waveform at Pin 6 of CN600.   Expected failure point IC601 Check the voltage waveform at the case of Q7B5. Expected failure point IC6A2 or peripheral circuits Expected failure point Q7B1-Q7B5 or T7A1 3-13...

  • Page 88: Functional Errors

    3.3 Functional Errors 3.3.1 OSM Failure Note: See “3.2 Abnormal picture” if a screen is not available even though a video signal input is entered.   Measure the waveform at Pins 16-19 of IC212 on the VIDEO PWB while the Check the OSM signal output.

  • Page 89: Power Management Functional Operation Error

    3.3.2 Power Management Functional Operation Error First of all, disconnect the signal cables from the signal source. (If a signal input is removed, the high voltage (HV) falles and the LED turns to ORANGE.) Check +215V output voltage (between GND and + electrode of C961 on the POWER PWB) and confirm whether the voltage falls approx.

  • Page 90: Plug & Play (Ddc2B) Operation Error

    3.3.3 Plug & Play (DDC2B) Operation Error   Check the waveform at Pin 4 of IC217 on the VIDEO PWB. Check the SCL line.   (Approx. 5Vp-p)       Check the voltage at Pin 11 of IC102 on the MAIN PWB.  ...

  • Page 91: Earth Magnetism Canceling Functional Operation Error

    3.3.5 Earth Magnetism Canceling Functional Operation Error Check the connection of CN2S0 on the SENSOR PWB and CN104 on the MAIN PWB. Check with CN2S0 is connected to CN104 Check the voltage at Pins 28 and 29 of IC102. No voltage fluctuation seen Expected failure point IC2S0 on the SENSOR PWB Voltage fluctuation seen...

  • Page 92: Circuit Errors

    3.4. Circuit Errors 3.4.1 Power Circuit Failure  Confirm that the voltage is maintained at approx. +5.15V between the C971 Check +5.15V output voltage. + electrode and GND. Remove the load of +5.15V line and check the output voltage of +5.15V. Check other circuits.

  • Page 93: Horizontal Oscillation /Deflection Circuit Failure

    3.4.2 Horizontal Oscillation /Deflection Circuit Failure (Check “3.1 No Raster Generated” and “3.2.3.1 Horizontal Sync Unstable” before this item) Check the 215V line. Check the voltage at Pin 1 of CN9A0 on the MAIN PWB.  Check the 215V line again after jumper in Pin 1 of CN9A0 line has been removed. *Notice: When reconnecting CN9A0, confirm that Pin 1 has discharged electricity.

  • Page 94: Vertical Oscillation / Deflection Circuit Failure

    3.4.3 Vertical Oscillation / Deflection Circuit Failure (Check “3.2.3.2 Vertical Sync Unstable” before checking of this item) Check the voltage at Pins 1 and 6 on the MAIN PWB. Check the +15V/-15V line. Expected failure point Power circuit (See Item 3.4.1)  Check the saw-tooth waveform at Pin 5 of IC401 on the MAIN PWB. ...

  • Page 95: Hv Circuit Failure

    3.4.4 High Voltage (HV)Circuit Failure (Check “3.1 No Raster Generated” before this item) Check the HV. Check the anode voltage of CRT. Usually, this high voltage is maintained at about 25kV. Check the 80V line. Check the voltage at L701 on the MAIN PWB. Expected failure point 1) Q701, T701 (FBT) or peripheral circuits 2) Video circuit (See Item 3.4.5)

  • Page 96: Video Circuit Failure

    3.4.5 Video Circuit Failure (Check “3.2.2 Image Color Failure or Contrast Failure” before this item) Check the R, G, B video outputs. Measure the waveforms at R200R, R200G, and R200B on the CRT PWB in the full white pattern. Measure the voltage between GND and Pin 6 of IC210 on the Check the 80V line.
  • Page 97   CONTINUE 1 CONTINUE 2 Measure the waveform at R/G/B output Pins 25, 27 Check the output waveform of pre-AMP. and 29 of IC211 on the VIDEO PWB. Expected failure point IC211 on the VIDEO PWB Expected failure point L211R/G/B or R211R/G/B  BLACK LEVEL Measure the voltage waveform at R200R/G/B on the CRT PWB, Check the R, G, B video outputs.

  • Page 98: Static Convergence Compensation Circuit Failure

    3.4.6 Static Convergence Compensation Circuit Failure   Good Adjust the static convergence by OSM control.  Confirm that the voltage (DC level) at Pins 3 (H-STA) and 4 (V-STA) of IC8A1 on the MAIN PWB is variable within the range of 0 to 5V by OSM control. Expected failure point  ...

  • Page 99: Corner Purity Compensation Circuit Failure

    3.4.7 Corner Purity Compensation Circuit Failure Adjust the corner purity by OSM control. Good Confirm that the voltage at Pins 49 (TR), 50 (TL), 51 (BR) and 52 (BL)   of IC102 on the MAIN PWB are variable by OSM control. Expected failure point  ...

  • Page 100: Mpu Operation Error

    3.4.8 MPU Operation Error Check the 5V line. Check the voltage at Pin 3 of IC100 on the MAIN PWB. Expected failure point The power circuit (See Item 3.4.1)  Check the reset voltage. Confirm that the voltage at Pin 12 of IC102 on the MAIN PWB is maintained at approx. 5V. Expected failure point IC100 on the MAIN PWB or C100 Confirm that a sinusoidal waveform of approx.

  • Page 101: Self-Diagnostic Functions

    3.4.9 Self-Diagnostic Functions This model is provided with the functions that a circuit error is detected by the MPU and this error is indicated by the LED blink frequency. When the protector is in operation, the LED is made to blink as shown below in order to indicate the factor of protector operation.

  • Page 102: Usb Circuit Failure

    3.4.10 USB Circuit Failure Check the 5V line. Check the voltage at Pin 6 of IC1A0 on the USB PWB and confirm that the voltage is approx. 5V. Expected failure point Power circuit (See Item 3.4.1) Peripheral circuits of Q1A1 to Q1A4 and IC1A0on the USB PWB Between CN1A5 on the USB PWB and CN953 on the POWER PWB Check the reset voltage.
  • Page 103 4. Wave form POWER CONTROL (MAIN) DEFL (MAIN) DEFL-SUB & COIL-DRIVE (MAIN) VIDEO...
  • Page 104 I I I I C C C C 9 9 9 9 0 0 0 0 3 3 3 3 ( ( ( ( 3 3 3 3 ) ) ) ) / / / / T T T T 9 9 9 9 0 0 0 0 2 2 2 2 ( ( ( ( 3 3 3 3 ) ) ) ) (Vpp=444V) 472V DPro2070SB/DPro2070SB-BK SCHEMATIC DIAGRAM POWER...
  • Page 105         I I I I C C C C 1 1 1 1 0 0 0 0 2 2 2 2 ( ( ( ( 3 3 3 3 8 8 8 8 ) ) ) ) DPro2070SB/DPro2070SB-BK IC102(22：KEY1)/(23：KEY2)の各SWの割り当て...
  • Page 106 (Vpp=1.5V) (Vpp=5.4V) (Vpp=11.2V) (Vpp=58V) (Vpp=40V) 4.4V (Vpp=56V) (Vpp=1.1KV) 1.1KV 2.3V DPro2070SB/DPro2070SB-BK 10.4V SCHEMATIC DIAGRAM MAIN (DEFL) -0.8V -16V H - S I Z E 可 変 で 帯 域 幅 変 化 0.8V -10V -22V ( + ) で 広 が る...
  • Page 107 ( + ) 側 電 圧 下 降 ( - ) 側 電 圧 上 昇 IC804⑧/⑨ V-CANCEL可変にて電圧変動 (-14〜+14V) ( + ) 側 電 圧 下 降 ( - ) 側 電 圧 上 昇 （H/V-SIZE可変で電圧変化） DPro2070SB/DPro2070SB-BK SCHEMATIC DIAGRAM MAIN (DEFL-SUB&COIL-DRIVE)
  • Page 108 GAIN CN210 (#1,#3,#5) BTCN (BRIGHTNESS CENTER) R/G/B-BIAS Black Level Voltage Range:0V - 5V Voltage Range:0V - 5V R/G/B-BIAS Black Level Voltage Range:Approx. 58V - 83V BTCN(BRIGHTNESS CENTER) Black Level Voltage Range:Approx. 53V - 86V DPro2070SB/DPro2070SB-BK No Voltage Description Resistor:1/8W CHIP SCHEMATIC DIAGRAM Not used:(    ) VIDEO...

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