NEC DPro2070SB Service Manual Download Page 81

Page: 81 / 108

3.2

.4 Screen Size and Screen Position Failure

3.2.4.1 Horizontal Size Failure

Expected failure point

IC5C0 on the MAIN PWB or peripheral circuits

Measure the waveform at the gate of Q5F1 on the MAIN PWB.
(Approx. 10Vp-p)

Horizontal
period

Expected failure point

Q5F0, Q5F1 or Q550 on the MAIN PWB, or peripheral circuits

Check the waveform at the gate of Q5F1.

Check the voltage at Pin 9 of IC5C0.

Examine the duty factor of the voltage waveform observed at Pin 9 of IC5C0 on the
MAIN PWB and confirm whether it is changed by the adjustment of horizontal size.

Expected failure point

T550 or the horizontal deflection circuit (See Item 3.4.2)

3-7

Summary of Contents for DPro2070SB

Page 1: ...SERVICE MANUAL CRT DISPLAY DPro2070SB DPro2070SB BK C22BW711 NEC MITSUBISHI ELECTRIC VISUAL SYSTEMS CORPORATION SEPTEMBER 2002 CBB S5784 ...

Page 2: ...replacing picture tube use only designated replacement part since it is a critical component with regard to X Radiation as noted above CRITICAL COMPONENT WARNING In the schematic diagram parts list the components marked are critical components for X ray radiation When replacing these parts use exactly the same one indication in parts list If one or some of the components listed below are replaced ...

Page 3: ...ical output amplification circuit 1 4 1 2 5 High voltage block 1 4 1 2 6 DBF Dynamic Beam Focus circuit 1 5 1 3 Video block 1 6 1 3 1 Video signal amplifier circuit 1 6 1 3 1 1 Video clamp 1 6 1 3 1 2 Video blanking 1 6 1 3 1 3 Video mixing amplifying 1 6 1 3 1 4 Control of contrast and white balance 1 6 1 3 2 Cut off control circuit 1 7 1 3 2 1 Control of brightness 1 7 1 3 2 2 Control of BIAS 1 ...

Page 4: ...1 19 1 5 3 HUB controller power output 1 19 1 5 4 USB power on reset 1 19 1 6 Control block 1 20 1 6 1 Function of control circuit 1 20 1 6 2 Auto tracking process 1 20 1 6 3 EEPROM 1 20 1 6 4 On Screen Manager OSM controller 1 20 1 6 5 Heater voltage control 1 20 1 6 6 Protection circuit operation 1 20 1 6 6 1 X ray protector 1 20 1 6 6 2 High voltage data error detection 1 21 1 6 6 3 Beam curren...

Page 5: ...t panel switches 2 7 2 4 2 Adjustments before aging 2 7 2 4 2 1 Adjusting the high voltage and high voltage protector 2 7 2 4 2 2 FOCUS adjustment Rough adjustment 2 8 2 4 2 3 Shock test 2 8 2 4 2 4 Preadjustment before aging 2 8 2 4 2 5 Adjusting the landing ITC 4 corner purity adjustment 2 9 2 4 3 Adjusting the picture size position and distortion DBF amplitude and phase 2 9 2 4 3 1 Adjusting th...

Page 6: ...Linearity 2 28 2 5 1 10 Adjustment value list 2 29 2 5 1 11 Confirming EDGELOCK and SYNC GREEN 2 30 2 5 1 12 Checking the functions during Composite Sync input 2 30 2 5 1 13 Confirming the reset operation 2 30 2 5 1 14 Confirming the full white luminance color coordination 2 30 2 5 1 15 Confirming CONVERGENCE compensation function 2 30 2 5 1 16 Confirming ROTATION compensation function 2 31 2 5 1 ...

Page 7: ...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 3 Trouble shooting 4 Wave form 5 Schematic diagram 6 Removal instruction sheet 7 Exploded view Packing view Appendix Serial number information Specification User s guide All parts list ...

Page 8: ...voltage approx 390VDC boosted with the booster circuit active filter circuit composed of IC901 Q901 L903 and D902 The active filter circuit compares the voltage input to pin 1 pin 3 and pin 4 of IC901 and controls Q901 ON OFF period so that the current flows to L903 be sine waved The AC input current is sine waved in the same phase with the input voltage so as to improve the power factor and the h...

Page 9: ...1 The flyback voltage generated at the secondary side in proportion to the one in the primary side is rectified at D961 D963 D964 D965 and D967 and smoothed at C961 C963 C964 C965 and C969 to generate the DC voltage The DC voltage generated at the secondary side is monitored by IC921 through R960 R961 R962 and R985 The information detected at IC921 is fed back to pin 1 of IC902 via PC901 and the O...

Page 10: ...er to control the horizontal width The parabola waveform output from IC601 is compared with the feedback waveform output from T5C0 to obtain the comparison waveform and this comparison waveform threshes the sawtooth waveform inside IC5C0 in order to control the duty If the duty is changed the rectified voltage of the S shaped compensation capacitor will be changed and the horizontal width will be ...

Page 11: ...cuit 1 2 5 High voltage block The high voltage block applies PWM control system that controls ON OFF time of the high voltage generation FET IC701 is the control IC that executes PWM control The pulse voltage generated at Q701 is boosted at T701 FBT to generate 27kV To keep the high voltage stably the feedback voltage from pin 10 of T701 is adopted the control voltage from pin 56 of microcomputer ...

Page 12: ...cation factor is about 10 times then it is amplified about 10 times with T7A1 On the other hand as for the vertical DBF voltage waveform the parabola waveform voltage approx 1 0Vp p is output from IC601 It is amplified about 40 times at Q7A1 and the vertical parabola wave is superposed to the horizontal parabola wave on the secondary side of T7A1 then consequently synthesized The collector pulse v...

Page 13: ...e polarity 3 3Vo p negative polarity 5 0Vo p and then reverses the polarity again negative polarity 5 0Vo p positive polarity 5 0Vo p to output the blanking signal This blanking signal is input to pin 14 of IC211 to perform blanking operation during horizontal vertical retracing operation To perform image blanking at switching the signal mode or at turning ON or OFF the power the contrast and the ...

Page 14: ...djustment 1 3 2 1 Control of brightness To simultaneously adjust 3 colors brightness the DAC voltage 0 to 5V variable line of microcomputer pin 55 is connected to the emitters of Q250R Q250G and Q250B via IC213 This connection enables simultaneous control of three TR collector currents and adjustment of the brightness 1 3 2 2 Control of BIAS To individually adjust 3 colors biases of R G and B the ...

Page 15: ...pin 14 of EEPROM IC217 from the PC via pin 9 of CN216 and the data stored in the EEPROM IC217 can be read out from I2C bus 1 3 7 AUTO SIZE function The AUTO SIZE function detects the phase data of RGB OR signal output to pin 11 of OSM IC212 from pin 15 of AMP IC211 from H OSM and V S signals input to pins 5 and 16 of IC212 in order to automatically adjust the screen to the optimum width and positi...

Page 16: ...ula GAIN adjustment value hex 3 x 1 Data hex of SBCN1 or SBCN2 FF hex 3 GAIN adjustment value is the following data in OSM FACT3 9300K R GN1 G GN1 B GN1 6500K R GN2 G GN2 B GN2 5000K R GN3 G GN3 B GN3 4 When the SUPER BRIGHT MODE 1 or MODE 2 is ON the GAIN cannot be adjusted as shown in the table in Sec 1 3 6 1 Adjustment item operating function in selecting SB Mode However when the SUPER BRIGHT M...

Page 17: ...C voltage commonly used for the 6H DC signal can adjust the bias voltage input to pin 5 of IC703 described above During normal operation the C_TIME_SEL signal is set to the high level Q704 is turned ON and pin 5 of IC703 is grounded via the GND line so that the output of IC703 pin 7 can be kept at the low level The signal output from pin 7 of IC703 is added to ABL signal with MD717 Diode When the ...

Page 18: ... CR discharge integration circuit composed of C723 and R737 through IC702 buffer amplifier by IC102 pin 26 CPU_ADC then the DC current of 19mA max flows to the purity coil on each corner according to the specified control program 3 High low temperature drift compensation The front panel glass is thermally expanded and contracted as the temperature varies in the installation environments of the mon...

Page 19: ...rcuit is the circuit to compensate for the color shade and deviation that reaches its maximum at the center in the horizontal axis direction and its minimum at the upper and lower ends on the monitor surface and the adjustment is done by DC current according to the value displayed on OSM flowing to the speed modulating coil installed in the neck part of CRT It is controlled with 0 to 5V of 2 5V re...

Page 20: ... in which the currents flow through 4H coils of the sub yoke is explained Regarding YHT secondary function in the vertical frequency in case of Fig 6 as an example the current is large in the same direction at the start upper end of the picture and the end lower end of the picture of the vertical frequency and is zeroed on the X axis of the picture Therefore the magnetic field that is proportional...

Page 21: ...ise adjustment with each adjustment item is applied The correspondence of the names of DDCC adjustment mode to the coefficients of all 30 elements is shown below 1 4 6 4 Block diagram Fig 9 shows the block diagram of the DDCC circuit The components 4H_DC pin 6 4H_SC pin 61 4V_DC pin 8 and 4V_SC pin 60 supplied from IC601 to 4H Coil and 4V Coil are output the dynamic component 4H_DC 4V_DC is amplif...

Page 22: ...1 15 Fig 7 The principle of DDCC compensation ...

Page 23: ...1 16 Fig 8 a DDCC adjustment item ...

Page 24: ...1 17 Fig 8 b DDCC adjustment item ...

Page 25: ...1 18 Fig 9 DDCC circuit diagram ...

Page 26: ...wer to each downstream port when overcurrent 500mA or more is detected at each port 1 5 2 USB downstream power supply 1 Supply of Vpp power When HUB controller IC1A0 is recognized from the direction of upstream the signal which functions as a switch of power output for a downstream port is output IC1A0 pins 2 16 17 and 32 When IC1A0 pins 2 16 17 and 32 become LOW FET gates are turned ON LOW and EF...

Page 27: ...ata is stored in the last 128 byte area 1 6 4 On Screen Manager OSM controller The On Screen Manager OSM controller IC IC212 displays the picture used for picture adjustment and so on OSM display data is sent from the microcomputer IC102 via I2C bus 1 6 5 Heater voltage control In the normally ON status the heater voltage is supplied from the 8V line of the main power circuit Heater resistor R203H...

Page 28: ...ker as shown below to indicate the activated protector to show the cause of the problem Table 2 Power On Indicator LED flickering pattern in each protector operating Power On Indicator LED state Protector state Short 0 5s lighting times Long 2s lighting times X ray protector 1 1 High voltage circuit latch detection 2 1 Data protector 3 1 Beam protector 5 1 B short circuit 7 1 1 6 6 5 Operating tim...

Page 29: ..._TL P16 PW6 P Corner purity TL 16 GND GND 49 PURITY_TR P17 PW7 P Corner purity TR 17 X TAL XTAL 48 GND Vss 18 X TAL EXTAL 47 DEGAUSS P20 PW8 O DEGAUSS 19 MODE SW1 SW1 Mode setting 46 V_CANCEL P21 PW9 P V magnetic field cancel output 20 MODE SW2 SW2 Mode setting 45 ROTATION P22 PW10 P Rotation 21 GND AVss 44 IIC_SDA SDA1 I O Internal IIC data 22 KEY1 AN0 P70 A D Key input 43 IIC_SCL SCL1 I O Intern...

Page 30: ...tion of the protection circuit will be retained until the power switch is turned OFF 1 7 3 IC701 overcurrent protection circuit The peak value of the drain current of Q701 and the both end voltages of source resistors R708 and R709 are detected by pin 2 of IC701 If the voltage of this pin exceeds 1 2V typ pin 9 of IC701 will stop outputting the drive waveform If the voltage of IC701 pin 2 drops be...

Page 31: ...uting the adjustment and setting When pressing button of EXIT and SELECT on the front panel the following menu picture is displayed on the screen The adjusted data in the user mode is memorized to EEPROM automatically The adjustment group can be selected with and buttons and buttons have the functions of the variable of the adjustment value The items can be adjusted in the user mode are as followi...

Page 32: ...N A N A COLOR TEMPERATURE To decrease the color temperature To increase the color temperature RED To decrease the red color To increase the red color GREEN To decrease the green color To increase the green color For each color temperature BLUE To decrease the blue color To increase the blue color Group 3 RESET Restore to factory preset level with RESET button IN OUT PIN CUSHION Forms a pin Forms a...

Page 33: ...green screen will be bluish GLOBAL SYNC BR The green screen will be reddish The green screen will be bluish GLOBAL SYNC L R The both side of the screen will be reddish The both side of the screen will be bluish Group5 RESET Restore to factory preset level with RESET button LANGUAGE Selects the left items Selects the right item OSM POSITION C BR BL TR TL C TL TR BL BR OSM TURN OFF Reduces the time ...

Page 34: ...factory mode 6 As shown below the adjustment data hexadecimal number and the adjustment group of FAC1 FAC2 and FAC3 1 8 3 2 How to cancel Factory mode Follow the procedure below to cancel the factory mode 1 Using the button select the FAC3 group and then press the button again The following OSM picture will appear H2 OW 01 FACT DATA 2 Press the or button to set the data value to 10 3 Press the SEL...

Page 35: ...1 28 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 ...

Page 36: ...contamination on the PWB 2 There must be no remarkable lifting or inclination of the parts on the PWB and the parts must not be touching 3 The connectors must be securely inserted without crimping faults 4 The CRT socket anode cap and focus lead must be securely mounted 5 The lead wires must not be pressed against the edges of the board 6 The lead wires must not touch the high temperature parts su...

Page 37: ... a 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 c f g d e Shrink D SUB 15P 2 INPUT 1 INPUT 2 UP DOWN 4 a Signal input connector b USB connector 2 3 2 Configuration of rear input connector signal input ...

Page 38: ...CK HOT KEY FACTORY PRESET OSM group USER7 DISPLAY MODE MONITOR INFO REFRESH NOTIFIER 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 COLOR1 2 3 sRGB 5 5000K 9300K 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 ENG D...

Page 39: ...C LR OSM group USER6 LANGUAGE OSM POSITION OSM TURN OFF OSM LOCK OUT IPM OFF MODE EDGE LOCK HOT KEY FACTORY PRESET OSM group USER7 DISPLAY MODE MONITOR INFO REFRESH NOTIFIER DESTINATION 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 0 0 100 0 16 8 82 7 16 8 82 7 0 0 100 0 0 0 ...

Page 40: ... L G BIAS L B BIAS L CPDIS PRDIS HVZER V PUR HPR G DBF2T DBF2B DBF4T DBF4B HFOCS VFOCS HFOCD SOG E DIREC WPDDC HPURC VPURC YH TT YH TB YH JT YH JB XH L XH R PQHTL PQHTR PQH BL PQH BR S3HTL S3HTR S3HBL S3HBR YV TT YB TB YV JT YV JB XV L XV R PQVTL PQVTR PQVBL PQVBR S3VTL S3VTR S3VBL S3VBR R BS1 G BS1 B BS1 R BS2 G BS2 B BS2 R BS3 G BS3 B BS3 0 0FF 1 ON 0 0FF 1 ON PRO EEh 000 0FF 000 0FF 000 7F 000 ...

Page 41: ... SBM CONTRAST1 SBM BRIGHT1 SBM CONTRAST2 SBM BRIGHT2 FACT HV HV ADJ CAUTION XPRO CALIBRATION XPRO TST CAUTION XPRO ADJ CAUTION R GN1 G GN1 B GN1 R GN2 G GN2 B GN2 R GN3 G GN3 B GN3 BTCEN BTMAX ABLAJ SBCN1 SBBR1 SBCN2 SBBR2 000 0FF 000 0FF 000 0FF 000 0FF 000 0FF 000 0FF 000 0FF 000 0FF 000 0FF 000 0FF 000 0FF 000 0FF 000 7DC 000 FFF 000 7DC 000 FFF 000 0A8 000 OFF 000 OFF HVADJ 20 OFF ...

Page 42: ... signal is only input 1 Turn the monitor power OFF and connect a high voltage indicator to the anode of CRT before turning the monitor power ON 2 Select FACT DATA on OSM and set to 250 using button before pushing the SE LECT S B MODE button 3 Select HVADJ HV ADJ CAUTION on OSM to adjust the high voltage to 27 0kV 0 5kV 4 Select XPCAL XPRO CALIBRATION on OSM and turn the screen VR all the way down ...

Page 43: ...3 R BS1 R BIAS H 00 G BS1 G BIAS H 8A B BS1 B BIAS H 00 BTCEN BRIGHT CENT 5E0 BTMAX BRIGHT MAX 800 c Connect PWB CRT TP R200G lead wire to the probe d Select BTCEN BRIGHT CENT in FACT3 set the black level voltage of PWB CRT TP R200G lead wire to 70 0 5V with the oscilloscope refer to the following picture In use of the digital voltage meter set it to 73 0 5V e Set the back raster luminance to 0 5 ...

Page 44: ... adjustment values Refer to 2 5 1 10 Adjustment value list Adjust the distortion to the value indicated in the picture performance inspection item Refer to 2 5 1 8 Picture distortion 2 4 3 1 Adjusting the picture inclination Set OSM to ROTATE and using buttons set the raster inclination to be horizontal to the CRT face surface 2 4 3 2 Adjusting the back raster position 1 Set BRIGHTNESS to 100 to s...

Page 45: ...ANCE with OSM and adjust so that the distortions are visually bal anced 7 Select LEFT RIGHT with OSM and adjust the horizontal raster position to the center of the picture using buttons 8 Select NARROW WIDE with OSM and adjust the horizontal raster width to the value given in the adjustment list using using buttons Refer to 2 5 1 10 Adjustment value list Note 1 PCC SINE LEFT RIGHT PIN VAL and PCC ...

Page 46: ...before aging is 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 B BS1 B BIAS H 00 BTMAX BRIGHT MAX 800 3 Set the back raster luminance to 0 3 1cd m2 with FBT screen VR 4 Adjust the back raster color coordination to the value listed in the follo...

Page 47: ...EN 8 If the back raster color coordination is deviated from the values listed in the following table repeat steps 6 and 7 9 Adjust the back raster luminance to 3 0 0 2cd m2 with BTMAX The following table is applicable for the monitor without the back cover 2 4 4 2 Adjusting BS2 BIAS M BS3 BIAS L 1 Set R BS2 R BIAS M G BS2 G BIAS M and B BS2 B BIAS M to the value listed in the following table 2 Set...

Page 48: ...mpensation Compare them to the data measured in 2 4 5 1 5 to confirm that the differences are within the following value range Color coordination of x and y within 0 020 Luminance within 0 05cd m2 3 If the color coordination and Iuminance of the back raster could not be within the value range specified in 2 above select CONSTANT BRIGHTNESS and push RESET button then carry out step 2 4 5 1 2 once 4...

Page 49: ...d SBCN2 are indi cated by hexadecimal number HEX the value is to be converted to the decimal number DEC first to be calculated then converted to the hexadecimal number HEX How to rewrite into address a Change to FACTORY MODE in advance b Set the counter of FACT DATA on OSM to 99 using buttons and push SELECT button c Press either or button and confirm that the following picture appears d Using but...

Page 50: ...kHz 85Hz 1600x1200 2 Select ABLAJ ABL with OSM and adjust to 115cd m2 5 Here the picture size should follow 2 5 1 10 Adjustment value list 2 4 7 Adjusting the focus NOTE For adjustment of focus with FOCUS VR be sure to use ISOLATED alignment driver Adjusting the static focus For steps 1 and 2 use the timing No 12 106 25kHz 85Hz 1600x1200 H character pattern and crosshatch pattern For step 3 use al...

Page 51: ... mode OSM display matrix All items of OSM group USER5 and FACT2 of Factory mode Adjust the horizontal and vertical convergence to the optimum setting with the CRT CP ring etc Refer to following drawings Timing Halo Halo Core Core Normal display All preset Reverse display Resolution 1600x1200 Resolution 1600x1200 Crosshatch pattern Judge with pattern A Judge with pattern B Judgment pattern Note 1 N...

Page 52: ... B Bow 4P and CP ASSY 4P Adjust so that LEFT RIGHT is 0 15mm or less with XV differential coil XH axial deviation YH axial deviation YV axial deviation XV characteristics XV axial deviation R B B Bow 4p and CP ASSY 4p Correction Method XH Slider DY Board B Bow 4p CP ASSY 4p XH Slider CRT DY Front Rear Viewed from neck side DY Board Adjustmennt stick Viewed from top side Top of DY YH a YH t Side Vi...

Page 53: ...m name Problem R B Adjustment point Adjustment procedure Adjustment order Adjust to 0 05mm or less Adjustment target is 0mm Adjust YH Top to 0 05mm or less with balance adjustment of YH TT and YH JT Adjustment target is 0mm NOTE The operating amount at YH M Top when moving YH TT and YH JT YH TT YH JT Adjust YH Bottom to 0 05mm or less with balance adjustment of YH TB and YH JB Adjustment target is...

Page 54: ...r B R PQH TL PQH TR PQH Top Left Adjust to 0 3mm or less Adjust to 0 3mm or less PQH Top Right 10 11 Adjust to 0 3mm or less Adjust to 0 3mm or less S3H TL S3H TR 6 7 S3H Top Left S3H Bottom Left S3H Bottom Right S3H Top Right R B Adjust to 0 3mm or less Adjust to 0 3mm or less S3H BL S3H BR 8 9 ...

Page 55: ...Adjustment item name Problem Adjustment point Adjustment procedure Adjustment order R Adjust to 0 05mm or less Adjustment target is 0mm Adjust YV Top to 0 05mm or less with balance adjustment of YV TT and YV JT Adjustment target is 0mm Note The operating amount at YV M Top when moving YV TT and YV JT YV TT YV JT Adjust YV Bottom to 0 05mm or less with balance adjustment of YV TB and YV JB Adjustme...

Page 56: ...ent order Adjust to 0 1mm or less Adjust to 0 1mm or less XV L XV R 4 5 XV Right XV Left Adjust to 0 3mm or less Adjust to 0 3mm or less S3V TL B R S3V TR 6 7 S3V Top Left S3V Top Right Adjust to 0 3mm or less Adjust to 0 3mm or less S3V BL S3V BR 8 9 S3V Bottom Left S3V Bottom Right B R ...

Page 57: ...ent order Specify the adjustment value range of the following adjustment items in general DDCP adjustment Adjustment items Adjustment value range Factory mode CONVERGENCE HOR 2Bh 43 D3h 211 OSM display value DAC output value CONVERGENCE VER 2Bh 43 D3h 211 OSM display value DAC output value YHJT Dh 13 F1h 241 YHJB Dh 13 F1h 241 DDCP 6H DC G R B Adjust to 0 05mm or less Adjustment target is 0mm 6H C...

Page 58: ...AST will be set to 100 when RESET button is pressed in the normal mode 4 How to set OSM BRIGHTNESS RESET value 30 1 in user mode a Change to FACTORY MODE in advance b Set the counter of FACT DATA on OSM to 99 using buttons and push SELECT button c Using buttons to set ADDR to 0B1 d Using buttons set DATA to 04D e Press EXIT button to record 04D set in d mentioned above f To disable this rewriting ...

Page 59: ...gaussing coil operation Confirm that when OSM DEGAUSS is executed the picture vibrates and then stops 2 5 1 4 IPM OFF MODE function operation Set the AC power input to 230V Use the full white pattern without R G B signals Select IPM OFF MODE from OSM and set to 1 ENABLE 1 IPM OFF MODE ENABLE a Confirm that when R G B H V SYNC signals are removed the system waits for approx five seconds displays IP...

Page 60: ... following values The mis convergence amount is the value between the two colors of R G and B separated the most in the horizontal X and vertical Y directions when a 15 vertical lines x 11 horizontal lines crosshatch is displayed This adjustment should be carried out with the convergence meter MINOLTA CC 100 Confirmation timing Timing No 12 106 25kHz 85Hz 1600x1200 Adjustment item Focus picture pe...

Page 61: ...hatch pattern a x 1 0mm b x 1 5mm Preset No 1 31 5kHz 60Hz is a x 1 5mm b x 2 0mm x 0 9mm x x y 50mm x x H line Per 50mm Scale Within n mm V line Set scale to V line Enlarged Inner distortion Vertical line X measurement method Distortion x of S character etc Distortion excluding normal pin barrel or trapezoid Distortion y High frequency distortion excluding trapezoid 4 edge distortion When S chara...

Page 62: ... Horizontal trapezoid top bottom vertical trapezoid left right Top bottom pin and barrel left right pin and barrel 7 Parallelogram distortion 8 Inclination x Curve within 50mm range horizontal y Curve within 50mm range vertical Measure y y1 y2 Item No Judgementreferencevalue Input signal y y1 y2 x x1 x2 Control with the above right value for each the top bottom left and right Measure the larger of...

Page 63: ...jacent 7 or less Calculation expression Xmax Xmin Xmax Xmin 2 If any doubts arise about the judgment judge with the horizontal vertical width tolerance of 3mm picture position L1 L2 3 0mm and L3 L4 3 0mm x 100 Distortion Must be within the following frame Note excluding ROTATION Picture position 9 y 2 0mm x 2 0mm Crosshatch pattern 10 L1 L2 5 0mm L3 L4 3 0mm Full white y x x L3 L2 L1 L4 y Specifie...

Page 64: ... 4 297 4 297 4 297 4 297 4 Standard Adj value 400 5 400 5 400 5 400 5 400 5 400 5 400 5 400 5 400 5 400 5 Max Adj value 430 430 430 430 430 430 430 430 430 430 Standard Adj value 135 20 135 20 135 20 135 20 135 20 135 20 135 20 135 20 135 20 135 20 Max Adj value 200 200 200 200 200 200 200 200 200 200 Horizontal width mm Vertical width mm DBF H amplitude H DBF V amplitude V Standard adjustment val...

Page 65: ...LOR 5 6500K should be confirmed using color temperature 6500K with color temperture adjust ment Confirm that the signal is input to INPUT 2 Confirmation of OSM color temperature 9300K x 0 283 0 04 Y 0 297 0 05 Confirmation should be carried out at white section on OSM picture Note In case confirmation is carried out with INPUT 1 the tolerance of color coordination should be 0 009 2 5 1 15 Confirmi...

Page 66: ...zel reference 2 5 1 20 Confirming SB MODE operation Timing No 12 106 25kHz 85Hz 1600x1200 Input amplitude 0 7Vp p white window The following items should be confirmed with CONTRAST MAX and BRIGHTNESS 50 Confirm that the color is not saturated with the white window picture during SB MODE2 operating Confirm the following items during SB MODE2 operating 1 Compensation of Confirm that A and B of the f...

Page 67: ... USB cable 2 Connect USB device to downstream connector 1 and confirm the operation 3 Connect USB device to downstream connector 2 and confirm the operation 4 Connect USB device to downstream connector 3 and confirm the operation 5 Connect USB device to downstream connector 4 and confirm the operation 6 Disconnect USB cable 2 5 1 23 Others 1 When any button is pressed the changes must be smooth an...

Page 68: ... according to VESA standard Ex 512002978 00000BA2 Models having MPU side Dedicated EEPROM side Data H Address H Address H NO ASSET function ASSET function Models having ASCII conversion Using the barcode system read the serial numbers 9 digits assigned at NMV Nagasaki then establish the serial number through the following conversion S N converted to ASCII code registered to Monitor Descriptor 4 in...

Page 69: ...ve Pixels 640 Aspect Ratio 4 3 480 active lines Refresh Rate 85 Hz Standard Timing 2 Horizontal Active Pixels 800 Aspect Ratio 4 3 600 active lines Refresh Rate 85 Hz Standard Timing 3 Horizontal Active Pixels 1024 Aspect Ratio 4 3 768 active lines Refresh Rate 85 Hz Standard Timing 4 Horizontal Active Pixels 1152 Aspect Ratio 4 3 864 active lines Refresh Rate 75 Hz Standard Timing 5 Horizontal Ac...

Page 70: ...hecking the labels Confirm that the SERVICEMAN WARNING rating label manufacturing date stamp SE RIAL NO label etc are attached to the specified position and have been checked 2 7 4 Packaging 1 There must be no remarkable contamination tearing or scratches etc 2 The model name must be accurately displayed 3 The SERIAL NO must be attached Must be the same No as the set 4 The package must be accurate...

Page 71: ...sing coil at the end separate as slow as possible with the following procedure If separated quickly stripes could remain at the picture corners 2 8 2 How to hold and use the handy demagnetizer 1 Approach the demagnetizer as carefully and slowly approx 1m 3 sec as possible and move around the bezel side periphery two to three times 2 Next gradually approx 1m 3 sec move to the CRT tube side and move...

Page 72: ...2 37 H SYNC Refer to after the next page for the preset timing details Tsh Tbh Tdh Th Tfh VIDEO V SYNC Video signal level Set Up nsignal level Tsv Tbv Tdv Tv Tfv VIDEO 2 10 Timing chart ...

Page 73: ...EC line 0 086 0 086 0 028 0 064 Tfv mSEC line 1 485 1 485 0 009 1 176 Tbv mSEC line 2 000 2 000 0 433 1 906 Tdv mSEC line 11 428 11 428 11 294 11 122 Hs Vs VIDEO level V 0 7 0 7 0 7 0 7 0 7 0 7 set up level V Serra tion 1H Remarks Check 1 Check 2 Check 4 1600 1280 85Hz S G Com posite Check 5 106 250 106 250 220 72 236 02 9 41 9 41 0 87 0 87 0 09 0 38 1 20 1 38 7 25 6 78 85 000 85 000 11 765 11 765...

Page 74: ...08 75 000 85 061 75 029 84 997 75 025 85 027 75 000 85 000 74 997 75 000 75 000 66 67 74 530 74 930 75 060 75 000 80 000 85 000 75 000 80 000 85 000 75 000 80 000 100 000 85 000 Tv mSEC line 14 268 449 16 683 525 13 333 500 11 764 509 13 333 625 11 756 631 13 328 800 11 765 808 13 329 1066 11 761 1072 13 333 1250 11 765 1250 13 334 1417 13 333 1500 13 333 1500 15 000 525 13 417 667 13 346 804 13 3...

Page 75: ...ilure 3 7 3 2 4 2 Horizontal Position Failure 3 8 3 2 4 3 Vertical Size and Position Failure 3 8 3 2 5 Linearity Failure 3 9 3 2 5 1 Horizontal Linearity Failure 3 9 3 2 5 2 Vertical Linearity Failure 3 10 3 2 6 Distortion Compensation Circuit Failure 3 11 3 2 6 1 IN OUT pincushion ALIGN trapezoidal and TOP BOTTOM corner correction Failure 3 11 3 2 6 2 LEFT RIGHT pincushion balance TILT parallelog...

Page 76: ... in 5V line OK NG Expected failure point IC102 or IC105 on the MAIN PWB or peripheral circuits OK NG Expected failure point The power circuits See Item 3 4 1 Expected failure point CN9A1 on the MAIN PWB cable or peripheral circuits Expected failure point IC102 or IC100 or peripheral circuits Check the AFC line OK NG Expected failure point Horizontal oscillation deflection circuits See Item 3 4 2 N...

Page 77: ...et GND Normal 65 to 75Vdc Normal 35Vp p Check the heater voltage Expected failure point CN202 CRT socket CRT or peripheral circuit OK NG Measure the heater voltage at Pin 7 of CN202 on the CRT PWB Check the screen voltage Expected failure point T701 FBT CRT socket or screen lead OK NG Measure the voltage of CN201 on the CRT PWB Usually the screen voltage is 600 to 800 Expected failure point CRT so...

Page 78: ...tage is 600 to 800V NG Expected failure point The video circuit is failure See Item 3 4 5 OK 3 2 2 Image Color Failure or Contrast Failure Check the video signal input Expected failure point Signal cable Measure the voltage at Pins 1 R 2 G and 3 B of CN215 and CN216 on the VIDEO PWB Usually the video input signal is maintained at 0 7Vp p NG Expected failure point The video circuit See Item 3 4 5 O...

Page 79: ...he MAIN PWB Approx 5Vp p Horizontal period Horizontal period OK Expected failure point CN103 or FFC cable OK Expected failure point Signal cable IC216 or peripheral circuits Check the H SYNC waveform at Pin 14 of CN212 on the VIDEO PWB Approx 5Vp p Check the horizontal sync signal Expected failure point IC102 IC105 or peripheral circuits Expected failure point The horizontal oscillation circuit Se...

Page 80: ...e point IC102 on MAIN PWB or peripheral circuits NG Check the vertical sync signal Check the V SYNC waveform at Pin 5 of CN103 on the MAIN PWB Approx 5Vp p Vertical period OK NG Check the vertical sync signal Check the V SYNC waveform at Pin 15 of CN212 on the VIDEO PWB Approx 5Vp p Vertical period Expected failure point CN103 or FFC cable NG OK Expected failure point Signal cable IC216 or periphe...

Page 81: ...izontal period Expected failure point Q5F0 Q5F1 or Q550 on the MAIN PWB or peripheral circuits Check the waveform at the gate of Q5F1 NG OK Check the voltage at Pin 9 of IC5C0 Examine the duty factor of the voltage waveform observed at Pin 9 of IC5C0 on the MAIN PWB and confirm whether it is changed by the adjustment of horizontal size OK Expected failure point T550 or the horizontal deflection ci...

Page 82: ...1V OK Expected failure point T550 D5A1 or D5A2 NG 3 2 4 3 Vertical Size and Position Failure Expected failure point 1 IC401 2 The power circuit D964 or D965 on the power circuit block NG Expected failure point IC401 on the MAIN PWB or peripheral circuits Expected failure point IC601 on the DEFL SUB PWB or peripheral circuits NG OK Check the voltage at Pin 15 of CN600 Check the voltage at Pin 16 of...

Page 83: ...H 8 106 H L L H H H H H 9 112 L L H H H H H H 10 120 H L H H H H H H Preset No Fh kHz Expected failure point IC102 on the MAIN PWB or peripheral circuits CS switching FET Q561 to Q568 are H Off L ON NG Expected failure point 1 Relation of Character S capacitor changeover Q561 Q568 C564 C568 C576 C578 or C580 on the MAIN PWB or peripheral circuits 2 Relation of linearity coil control Q560 L561 IC10...

Page 84: ... 3 Peripheral circuits Check how the voltage waveform at Pin 15 of CN600 on the MAIN PWB changes to the shape of Character C when up and down balance control is carried out for OSM linearity Check how the voltage waveform at Pin 15 of CN600 on the MAIN PWB changes to the shape of Character S when vertical balance control is carried out for OSM linearity NG OK Check Pins 3 and 8 of CN601 Check volt...

Page 85: ...f CN601 on the MAIN PWB and confirm whether its phase is changed by the adjustment of OSM Expected failure point Q501 Q502 Q503 Q504 or T501 on the MAIN PWB or peripheral circuits Expected failure point IC601 on the DEFL SUB PWB or peripheral circuits Expected failure point IC102 or peripheral circuits Check voltage at Pin 45 of IC102 of the MAIN PWB OK NG Control the ROTATE with OSM and confirm w...

Page 86: ... probe should be used for the measurement OK Check voltage waveform at Pin 4 of CN600 The horizontal and vertical waveforms are inadequate Expected failure point T7A1 The horizontal waveform is inadequate The vertical waveform is inadequate Expected failure point T701 FBT or CRT OK Expected failure point IC601 or peripheral circuits OK NG Check the voltage waveform at the base of Q7A1 Expected fai...

Page 87: ... NG NG Expected failure point IC6A2 or peripheral circuits Expected failure point Q7B1 Q7B5 or T7A1 Check the voltage waveform at the case of Q7B5 The horizontal waveform is inadequate Check the voltage waveform at Pin 6 of CN600 CONTINUE ...

Page 88: ...02 OK NG Check the OSM control line I2 C Measure the waveform at Pin 14 of IC212 on the VIDEO PWB Approx 5Vp p Expected failure point IC212 on the VIDEO PWB NG OK Measure the waveform at Pin 7 and 8 of IC212 on the VIDEO PWB Approx 5Vp p Expected failure point IC102 on the MAIN PWB OK Expected failure point SW101 SW107 on the MAIN PWB R10A R10G R10K or R10L NG Measure the voltage at Pins 22 and 23...

Page 89: ...voltage falls Check the LED color Green Unlit Expected failure point IC102 Q100 R110 or LED101 on the MAIN PWB Check whether the power save function is turned OFF with the OSM 215V is maintained State of ON setting State of OFF setting Reset to ON and check 215V output voltage 215V is maintained The voltage falls to approx 0V Check the output voltage at Pins 5 and 42 of IC102 Output from IC102 in ...

Page 90: ...EO PWB Approx 0V DDC1 communication is maintained 3 3 4 Degaussing Functional Operation Error Expected failure point 1 Degaussing coil 2 TH902 RL901 D950 or R954 on the POWER Confirm that the potential at Pin 47 of IC102 on the MAIN PWB turns the HIGH level for about 6 seconds when manual degaussing is carried out with OSM OK NG Expected failure point IC102 on the MAIN PWB Check the degaussing con...

Page 91: ...7 R10A R10G R10K R10L or peripheral circuits Check voltages with operation keys Confirm that the voltage at Pin 22 and 23 of IC102 on the MAIN PWB are as specified in the table below when the operation key is pressed Expected failure point IC102 on the MAIN PWB OK NG Check with CN2S0 is connected to CN104 Expected failure point IC2S0 on the SENSOR PWB Voltage fluctuation seen No voltage fluctuatio...

Page 92: ... the output voltage of 5 15V OK NG Voltage is 0V The voltage is 2 times as AC input voltage Expected failure point F902 D901 Q901 Q901 IC902 IC903 D961 D963 D964 D965 D967 or D971 Confirm that the voltage is maintained at approx 18V between and electrode of C931 Expected failure point IC901or peripheral circuits NG OK Expected failure point IC903 D932 PC902 D971 IC922 or ZD971 Confirm that the vol...

Page 93: ...xpected failure point Q550 T501 D502 or D550 on the MAIN PWB or peripheral circuits Check the drain waveform at Q5F1 Check the drain voltage waveform of Q5F1 on the MAIN PWB and confirm that there is a waveform output as shown below NG Expected failure point Q5F0 Q5F1 or IC5C0 on the MAIN PWB or peripheral circuits Approx 215V Horizontal duration Horizontal period Check the range of horizontal osc...

Page 94: ...uits Check the saw tooth waveform at Pin 5 of IC401 on the MAIN PWB NG Check the vertical control input OK Check the saw tooth waveform at Pin 7 of IC401 on the MAIN PWB OK NG Check the saw tooth waveform at Pin 15 of CN600 on the MAIN PWB NG Expected failure point IC601 IC401 or peripheral circuits Approx 3Vp p Expected failure point Power circuit See Item 3 4 1 Expected failure point IC401 verti...

Page 95: ... 4 5 3 The switching power circuit See Item 3 4 1 Check the voltage at L701 on the MAIN PWB NG OK Check the 80V line Check the voltage at Pin 10 of IC701 on the MAIN PWB NG OK Check the voltage at Pin 8 of IC701 on the MAIN PWB NG OK Check the voltage waveform at the emitter Q702 on the MAIN PWB NG Expected failure point Q701 IC701 or T701 FBT on the MAIN PWB or peripheral circuit Check the HV dri...

Page 96: ... NG OK Check the blanking signal Expected failure point IC601 on the DEFL_SUB PWB or CN212 NG OK Measure the waveform at Pin 14 of IC211 on the VIDEO PWB Confirm that the blanking waveform is maintained at approx 5Vp p Check the clamp waveform Expected failure point IC102 on the MAIN PWB or CN212 NG OK Measure the potential at Pin 13 of IC211 on the VIDEO PWB and confirm that clamp waveform is mai...

Page 97: ...ge is approx 60 100V NG OK Confirm the voltage at the base of R250R G B is approx 6V Expected failure point R261 D264 R260 or peripheral circuits NG OK Expected failure point Q250R G B or Q251R G B Expected failure point L200R G B or L201R G B Check the HV operation Confirm whether the HV is 27 0 5KV Expected failure point The HV circuit See Item 3 4 4 NG OK Check the heater voltage Measure the vo...

Page 98: ...l H STA Confirm that the output voltage at Pin 1 of IC8A1 is variable by OSM control V STA Confirm that the output voltage at Pin 6 of IC8A1 is variable by OSM control NG OK Expected failure point H STA The horizontal static convergence coil of Pins 1 and 2 of CN8A1 V STA The vertical static convergence coil at Pins 3 and 4 of CN8A1 Replace the DY deflection yoke if the horizontal or vertical stat...

Page 99: ...n 2 of CN801 2 TL The corner purity coil of Pin 4 of CN801 3 BR The corner purity coil of Pin 6 of CN801 4 BL The corner purity coil of Pin 8 of CN801 Expected failure point IC801 or IC803 TR Confirm that the output voltage at Pin 8 of IC803 is variable by OSM control TL Confirm that the output voltage at Pin 2 of IC803 is variable by OSM control BR Confirm that the output voltage at Pin 8 of IC80...

Page 100: ...N PWB or C100 Confirm that a sinusoidal waveform of approx 3 to 5Vp p is generated at a frequency of 20MHz NG OK Check the waveform at Pins 17 and 18 on the MAIN PWB Expected failure point X100 on the MAIN PWB or IC102 NG OK Check the sync signal Expected failure point Check sync failure See Item 3 2 3 Confirm that there are horizontal sync 5Vp p input to Pin 36 and vertical sync 5Vp p input to Pi...

Page 101: ...or condition Short 0 5s lighting frequency Long 2s lighting frequency HV data error 3 1 HV latch fall 2 1 Beam protector 5 1 Secondary power short 7 X lay protector 1 1 1 How to count the LED lighting frequency Example HV data error 3 times 2 sec 0 5 sec 0 5 sec 0 5 sec 2 sec Once Twice 3 times Frequency Lighting 3 times Lit Unlit 2 Diagnostic mode and error circuit 3 times HV data error Power OFF...

Page 102: ... 29 of IC1A0 Confirm that the waveform of approx 3 3Vp p is generated with UPSTREAM is connected with the PC Just the voltage level should be confirmed because the waveform varies by the PC Confirm that the sinusoidal waveform of approx 3 to 4Vp p is generated at the frequency of 6MHz with UPSTREAM is connected with the PC Check the waveform at Pins 19 and 20 of IC1A0 on the USB PWB Expected failu...

Page 103: ...4 Wave form 1 POWER 2 CONTROL MAIN 3 DEFL MAIN 4 DEFL SUB COIL DRIVE MAIN 5 VIDEO ...

Page 104: ... 0 0 01 1 1 1 G G G G 16V Vpp 16V 392V 16V 3 3 3 3 Q Q Q Q9 9 9 90 0 0 01 1 1 1 D D D D Vpp 376V 720V 32V 4 4 4 4 I I I IC C C C9 9 9 90 0 0 02 2 2 2 3 3 3 3 T T T T9 9 9 90 0 0 01 1 1 1 2 2 2 2 Vpp 688V 1 2 3 0V 16V 16V 0V 4 390V 6V 5 12V DEGAUSS動作時 5V 15V 12V 全波整流 Vpp 444V 472V 28V 5 5 5 5 I I I IC C C C9 9 9 90 0 0 03 3 3 3 3 3 3 3 T T T T9 9 9 90 0 0 02 2 2 2 3 3 3 3 ...

Page 105: ... I I IC C C C1 1 1 10 0 0 02 2 2 2 3 3 3 38 8 8 8 5V Vpp 5V 2 2 2 2 I I I IC C C C1 1 1 10 0 0 02 2 2 2 3 3 3 33 3 3 3 5V Vpp 5V 6 6 6 6 I I I IC C C C1 1 1 10 0 0 02 2 2 2 5 5 5 55 5 5 5 5V Vpp 5V 7 7 7 7 I I I IC C C C1 1 1 10 0 0 02 2 2 2 3 3 3 37 7 7 7 0 22V 0 8V Vpp 1 02V 8 8 8 8 I I I IC C C C1 1 1 10 0 0 02 2 2 2 4 4 4 40 0 0 0 5V Vpp 5V 9 9 9 9 I I I IC C C C1 1 1 10 0 0 02 2 2 2 4 4 4 41 ...

Page 106: ...4 4 4 40 0 0 01 1 1 1 2 2 2 2 46V 10V Vpp 56V 1 1KV 3 3 3 3 Q Q Q Q5 5 5 55 5 5 50 0 0 0 C C C C T T T T5 5 5 55 5 5 50 0 0 0 8 8 8 8 Vpp 1 1KV 16V 2 2 2 2 Q Q Q Q5 5 5 50 0 0 04 4 4 4 D D D D T T T T5 5 5 50 0 0 01 1 1 1 4 4 4 4 Vpp 40V 24V 1V 4 4V Vpp 5 4V 5 5 5 5 I I I IC C C C5 5 5 5C C C C0 0 0 0 8 8 8 8 9 9 9 9 T T T T7 7 7 7A A A A1 1 1 1 3 3 3 3 36V 22V Vpp 58V 7 7 7 7 I I I IC C C C7 7 7 ...

Page 107: ... 6 60 0 0 00 0 0 0 1 1 1 1 3 4V Vpp 3 4V 1 1 1 1 I I I IC C C C6 6 6 6A A A A2 2 2 2 1 1 1 1 6 4V 2 2V Vpp 4 2V V A M P 可変で電圧変化 4 4 4 4 I I I IC C C C6 6 6 6A A A A2 2 2 2 7 7 7 7 6 3V Vpp 6 3V H A M P 可変で電圧変化 5 5 5 5 I I I IC C C C6 6 6 6A A A A1 1 1 1 1 1 1 10 0 0 0 C C C CN N N N6 6 6 60 0 0 01 1 1 1 1 1 1 10 0 0 0 5 4V Vpp 5 4V 9 2 2 2 2 I I I IC C C C6 6 6 6A A A A2 2 2 2 2 2 2 2 ...

Page 108: ...k Level 67V GAIN GAIN SUPER BRIGHT MODE OFF 36Vp p typ SUPER BRIGHT MODE 1 ON 44Vp p typ SUPER BRIGHT MODE 2 ON 44Vp p typ DAC R G B BIAS Voltage Range 1 5V 5 5V CN210 1 3 5 GND Black Level R G B BIAS Black Level Voltage Range Approx 58V 83V BTCN BRIGHTNESS CENTER Black Level Voltage Range Approx 53V 86V R G B BIAS BTCN BRIGHTNESS CENTER DAC Voltage Range 0V 5V Voltage Range 0V 5V No Voltage Descr...

Search results

Summary of Contents for DPro2070SB

Reviews:

Related manuals for DPro2070SB

Brands by name

Popular brands

NEC DPro2070SB, Service Manual

Search results

Summary of Contents for DPro2070SB

Reviews:

Related manuals for DPro2070SB

Brands by name

Popular brands