NEC N9902-1 Service Manual Download Page 29

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N9902 Theory of circuit operation

This monitor contains the following blocks

Page

1.Power Supply .................................................................................................................................. 27

2.Video Circuit & OSD ....................................................................................................................... 27

3.Micro Controller System ................................................................................................................. 27

4.Vertical Deflection ........................................................................................................................... 28

5.Horizontal Deflection ....................................................................................................................... 28

6.FBT Secondary & Dynamic Focus .................................................................................................. 29

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Summary of Contents for N9902-1

Page 1: ...ice Better Reputation Better Profit MITSUBISHI NEC MITSUBISHI ELECTRIC VISUAL SYSTEMS MODELS MultiSync V920 MultiSync V921 1 MultiSync 95 AccuSync 90 AccuSync 90 M N9902 1 Series Model All manuals and...

Page 2: ...n and maintenance of this unit has been included Therefore it should be read carefully in order to avoid any problems PRODUCT SAFETY CAUTION 1 When parts replacement is required for servicing always u...

Page 3: ...SPECIFICATIONS 6 TROUBLE SHOOTING 17 THEORY OF CIRCUIT DESCRIPTION 26 REPLACEMENT PARTS LIST 1 MultiSync V920 30 2 MultiSync V921 1 53 3 MultiSync 95 55 4 AccuSync 90 57 5 AccuSync 90M 59 BLOCK DIAGR...

Page 4: ...120 Hz 1152 870 55 to 105 Hz 1280 1024 55 to 89 Hz 1600 1200 55 to 76 Hz Some systems may not support all modes listed NMV cites recommended resolution at 85 Hz for optimal display performance Active...

Page 5: ...Control Adjust the red contrast of the display G Green Color Control Adjust the green contrast of the display B Blue Color Control Adjust the blue contrast of the display Moves the image horizontally...

Page 6: ...elapse between uses of the Degauss Control 9300 This color setting is adjusted at the factory to the stated Kelvin OSD There are 3 background color blue black and white To choose background color pre...

Page 7: ...d It doesn t have meaning specially 4 SERIAL NUMBER INFORMATION Refer to the serial number information shown below Manufactured Year Last digit Manufactured Month January to September 1 to 9 October X...

Page 8: ...connect the GND wire CRT coating earth wire from MAIN BOARD ASSY and CRT BOARD ASSY This model has three kinds of CRT Depend on CRT the GND wire assembly is some different Be careful 3 Disconnect the...

Page 9: ...ge Adjustment Raster Brightness Adjustment 8 12 Focus Adjust 9 13 Convergence Adjust 9 14 Automatically Adjust 9 15 White Balance Adjustment 9 16 White Balance Check and ABL Adjust 9 17 Power Saving T...

Page 10: ...Adjustment Specifications 1 Adjustment tools A Color Analyzer B CHAROMA 2135 or Function Generator C Multi meter D Hi Pot Probe E Convergence Meter F Degauss Probe G Power Meter H Automatic Alignment...

Page 11: ...make raster is centrally on CRT 9 H size Adjustment A MODE 53 7kHz 800 600 85 B PATTERN CROSSHATCH C Adjust H SIZE OSD set to Max then adjust VR305 to make the full scan 10 MODE 11 Pre Adjustment A M...

Page 12: ...the spec adjust Yoke coil to make be follow the spec 14 Automatically adjust Adjust H SIZE V SIZE H PHASE V PHASE PINCUSHION TRAPEZOID R G B GAIN by factory product line automatic adjustment system ws...

Page 13: ...E condition Adjust R G B GAIN to be 6500K color due to about spec G Adjustment Brightness control and contrast control set to Max adjust VR303 to Y 29 31FT L 103 3cd m 17 POWER SAVING Test A MODE 60kH...

Page 14: ...6 80 64 uS 3 18 3 813 2 032 1 556 1 616 1 117 Back dot 48 48 120 80 160 224 uS 1 91 1 907 3 810 2 222 3 232 3 910 Total H 449 525 500 509 625 667 m S 14 268 16 683 13 333 11 764 13 333 13 414 D isp H...

Page 15: ...ync dot 64 96 112 96 144 160 uS 1 138 1 219 1 037 1 016 1 067 1 016 Back dot 152 176 248 208 248 224 uS 2 702 2 235 2 296 2 201 1 873 1 422 Total H 631 800 1066 808 1066 1072 m S 11 756 13 328 16 661...

Page 16: ...36 64 160 uS 0 948 2 09 2 536 1 016 Back dot 304 160 120 224 uS 1 501 2 46 4 754 1 422 Total H 1250 806 432 1072 m S 13 333 16 667 14 376 11 761 Disp H 1200 768 400 1024 m S 12 800 15 880 13 311 11 23...

Page 17: ...r Cable 2 EDID Write and Inspection Method 1 Run specified EDID write and Inspection program on PC DOS mode The monitor turns into the self test mode 2 Run the specified EDID write and inspection prog...

Page 18: ...k of Manufacture Month 4 Year of Manufacture Serial No Area 9bytes Check Sum 2 Bar Code Format code39 Model Code 1 space Serial No Serial No Descriptions Y Manufactured Year Last digit ex 0 2000 M Man...

Page 19: ...of Manufacture Serial No Area 9bytes Check Sum 0 1 2 3 4 5 6 7 8 9 A B C D E F 00 00 FF FF FF FF FF FF 00 38 A3 C2 5D 01 01 01 01 10 24 09 01 02 0C 25 1B 78 EA 22 28 A1 54 48 99 26 20 11 48 4C FF FF...

Page 20: ...using this chart TABLE OF CONTENTS Page 1 NO OPERATION POWER LED FLASH 18 2 NO OPERATION POWER LED OFF 19 3 VIDEO NOISE UNSYNCHRONOUS 20 4 NO VIDEO 21 5 NO RASTER 22 6 TROUBLE IN H V SYNC 23 7 PINCUS...

Page 21: ...POWER LED FLASH POWER SW TURN OFF POWER SW TURN OFF MULTIMETER TEST Q315 Q312 D114 D110 D111 D112 D113 1 NO OPERATION POWER LED FLASH All manuals and user guides at all guides com a l l g u i d e s c...

Page 22: ...TO C105 2 SCOPE SET AT 10V DIV 10US DIV PROBE CONNECT TO Q101 GATE AND C105 POWER SW TURN OFF CHECK F101 CHECK Q101 CHECK U101 U101 PIN6 PULSE O P POWER SW TURN ON FAILURE R111 ZD103 CHECK U101 PIN 7...

Page 23: ...CK Q312 FREQUENCY SYNCRONIZE WITH H SYNC CHECK U301 NORMAL OPERATION CHECK Q101 G S FREQUENCY SYNCRONIZE WITH H SYNC CHECK C114 R116 D109 R115 R117 YES YES NO NO NO 3 VIDEO NOISE UNSYNCHRONOUS 20 All...

Page 24: ...ROUBLE IN U201 CLAMP PIN 19 U201 12V VOLTAGE YES CHECK U203 PIN 1 3 5 SIGNAL LEVEL CHECK CATHODE VIDEO LEVEL TROUBLE IN CRT YES YES TROUBLE IN U203 R220 R240 R260 NO TROUBLE IN U203 8V 12V 80V VOLTAGE...

Page 25: ...5V TROUBLE IN G2 VOLTAGE YES YES TROUBLE IN Q331 Q323 Q329 R394 D314 T302 C328 U701 NO NO CHECK T302 PIN 3 VOLTAGE 57V AT 31 5KHz 172V AT 93 7KHz TROUBLE IN U301 Q312 D317 D111 R387 R312 Q307 Q308 OR...

Page 26: ...ECK U701 PIN 32 33 H V SYNC SIGNAL CHECK U701 PIN 5 VOLTAGE 5V TROUBLE IN 5V LINE YES NO YES YES YES CHECK U701 PIN 1 2 TROUBLE IN U301 YES YES NO NO NO CHECK U701 PIN 7 8 FREQ 12MHz TROUBLE IN H V SI...

Page 27: ...PINCUSHION PARABOLA WAVE CHECK U301 PIN 24 PARABOLA TROUBLE IN U301 CHECK C350 Q332 R30V R30W CHECK Q309 Q311 NO NO YES YES YES 24 7 PINCUSHION POOR All manuals and user guides at all guides com...

Page 28: ...US AND DYNAMIC FOCUS VR LINE TO CRT SOCKET 2 CRT SOCKET OR CRT POOR NO NO CHECK C323 H PARABOLA WAVEFORM 29Vpp CHECK Q303 Q304 EMITTER H PARABOLA 32 Vpp TROUBLE IN T303 TROUBLE IN Q302 Q303 Q304 Q338...

Page 29: ...tor contains the following blocks Page 1 Power Supply 27 2 Video Circuit OSD 27 3 Micro Controller System 27 4 Vertical Deflection 28 5 Horizontal Deflection 28 6 FBT Secondary Dynamic Focus 29 26 All...

Page 30: ...ed by MCU IIC bus for the features of contrast output DC level 3 SUB gain controls R Gain G Gain B Gain b U201 PIN 19 need a positive pulse for clamping and PIN 27 also need a positive pulse for blank...

Page 31: ...a H H H Factory PMS_OFF No pulses No pulses L L Adj data H H H b The U702 is an EEPROM IC which stores the parameters of each mode and the user adjusting result and also DDC data It is controlled by I...

Page 32: ...24 Q326 Q325 and Q327 respectively So different frequency has different combination to meet the requirement 6 FBT Secondary Dynamic Focus a Focus and screen voltage are come from FBT bleeder b G1 bias...

Page 33: ...GB710353 CERAMIC Y5P B T 0 01u 50V K C232 1 27 CRT BOARD A I GA347625 ELECT 85oC T 47u 16V M C233 1 28 CRT BOARD A I GA410575 ELECT NP T 1u 100V M C234 1 29 CRT BOARD A I GB910358 CERAMIC Z5V F T 0 0...

Page 34: ...D213 1 76 CRT BOARD A I 80000451 DIODE T 1SS83 D214 1 77 CRT BOARD A I 80004711 DIODE T 1SS244 D214 OR 78 CRT BOARD A I 80000451 DIODE T 1SS83 D215 1 79 CRT BOARD A I 80004711 DIODE T 1SS244 D215 OR 8...

Page 35: ...A I R0319112 JUMPER WIRE AI T 7 5mm J9 1 132 CRT BOARD A I R0319112 JUMPER WIRE AI T 7 5mm JP1 1 133 CRT BOARD A I HB013568 PACKING COIL T 0 56uH K EC24 L212 1 134 CRT BOARD A I HB013568 PACKING COIL...

Page 36: ...0471 CARBON 1 8W T 5 470ohm R253 1 185 CRT BOARD A I FA040560 CARBON 1 8W T 5 56ohm R254 1 186 CRT BOARD A I FA040751 CARBON 1 8W T 5 750ohm R255 1 187 CRT BOARD A I FA240101 CARBON 1 4W T 5 100ohm R2...

Page 37: ...341 IC M52743BSP U201 1 237 CRT BOARD INSERT 80005351 IC MTV021N 38 U202 1 238 CRT BOARD INSERT 12600022 HEAT SINK VIDEO U203 1 239 CRT BOARD INSERT 14000041 SCREW P 2CBRTS 3 8 15BF U203 1 240 CRT BOA...

Page 38: ...AIN BOARD A I GA347625 ELECT 85oC T 47u 16V M C312 1 291 MAIN BOARD A I GA310725 ELECT 85oC T 100u 16V M C314 1 292 MAIN BOARD A I GF210262 MEF CAP BOX 0 001u 63V J C315 1 293 MAIN BOARD A I GF210252...

Page 39: ...64 1 343 MAIN BOARD A I GB210458 CERAMIC Y5V T 0 1u 50V Z C365 1 344 MAIN BOARD A I R0319111 JUMPER WIRE AI T 5mm C367 1 345 MAIN BOARD A I GB210458 CERAMIC Y5V T 0 1u 50V Z C368 1 346 MAIN BOARD A I...

Page 40: ...ELECT 85oC T 10u 50V M C707 1 395 MAIN BOARD A I GB710253 CERAMIC Y5P B T 1000P 50V K C716 1 396 MAIN BOARD A I GB210458 CERAMIC Y5V T 0 1u 50V Z C717 1 397 MAIN BOARD A I GB210458 CERAMIC Y5V T 0 1u...

Page 41: ...I R0319115 JUMPER WIRE AI T 15mm J108 1 451 MAIN BOARD A I R0319115 JUMPER WIRE AI T 15mm J109 1 452 MAIN BOARD A I R0319117 JUMPER WIRE AI T 20mm J11 1 453 MAIN BOARD A I R0319117 JUMPER WIRE AI T 20...

Page 42: ...OARD A I R0319117 JUMPER WIRE AI T 20mm J156 1 503 MAIN BOARD A I R0319112 JUMPER WIRE AI T 7 5mm J157 1 504 MAIN BOARD A I R0319112 JUMPER WIRE AI T 7 5mm J158 1 505 MAIN BOARD A I R0319112 JUMPER WI...

Page 43: ...555 MAIN BOARD A I R0319117 JUMPER WIRE AI T 20mm J34 1 556 MAIN BOARD A I R0319114 JUMPER WIRE AI T 12 5mm J35 1 557 MAIN BOARD A I R0319112 JUMPER WIRE AI T 7 5mm J36 1 558 MAIN BOARD A I R0319117 J...

Page 44: ...OARD A I R0319113 JUMPER WIRE AI T 10mm J85 1 609 MAIN BOARD A I R0319112 JUMPER WIRE AI T 7 5mm J86 1 610 MAIN BOARD A I R0319113 JUMPER WIRE AI T 10mm J87 1 611 MAIN BOARD A I R0319116 JUMPER WIRE A...

Page 45: ...OARD A I 80003241 TR PNP KTA733 TO 92 T Q310 OR 662 MAIN BOARD A I EBA07336 TR PNP 2SA733P TO 92 T Q310 1 663 MAIN BOARD A I 80003241 TR PNP KTA733 TO 92 T Q311 OR 664 MAIN BOARD A I EBA07336 TR PNP 2...

Page 46: ...33P TO 92 T Q703 1 714 MAIN BOARD A I FA330684 CARBON 1 2W T 5 680K R101 1 715 MAIN BOARD A I FA240620 CARBON 1 4W T 5 62ohm R102 1 716 MAIN BOARD A I FA040223 CARBON 1 8W T 5 22K R106 1 717 MAIN BOAR...

Page 47: ...7 MAIN BOARD A I FA040104 CARBON 1 8W T 5 100K R309 1 768 MAIN BOARD A I FA240105 CARBON 1 4W T 5 1M R30A 1 769 MAIN BOARD A I FA040104 CARBON 1 8W T 5 100K R30B 1 770 MAIN BOARD A I FA040102 CARBON 1...

Page 48: ...20 MAIN BOARD A I FA040104 CARBON 1 8W T 5 100K R32N 1 821 MAIN BOARD A I FA040472 CARBON 1 8W T 5 4 7K R32P 1 822 MAIN BOARD A I FA330474 CARBON 1 2W T 5 470K R32R 1 823 MAIN BOARD A I FA040103 CARBO...

Page 49: ...OARD A I FA040100 CARBON 1 8W T 5 10ohm R391 1 874 MAIN BOARD A I FA040103 CARBON 1 8W T 5 10K R392 1 875 MAIN BOARD A I FA240202 CARBON 1 4W T 5 2K R393 1 876 MAIN BOARD A I FB910010 METAL 1 4W T 5 1...

Page 50: ...927 MAIN BOARD A I FA040103 CARBON 1 8W T 5 10K R751 1 928 MAIN BOARD A I FA040472 CARBON 1 8W T 5 4 7K R752 1 929 MAIN BOARD A I FA040472 CARBON 1 8W T 5 4 7K R753 1 930 MAIN BOARD A I FA040472 CARB...

Page 51: ...63V M TL KAIMEI C138 1 979 MAIN BOARD INSERT GAB47735 ELECT 105oC A 470u 25V M C143 1 980 MAIN BOARD INSERT GAB47735 ELECT 105oC A 470u 25V M C153 1 981 MAIN BOARD INSERT GAA10685 ELECT 85oC A 10u 250...

Page 52: ...INSERT 80003911 CHOKE 45UH MS90 L306 1 1032 MAIN BOARD INSERT 80003901 CHOKE 2 2mH MS90 L307 1 1033 MAIN BOARD INSERT 80000131 LED L 59GH 1GYC t y LED101 1 1034 MAIN BOARD INSERT 14000051 SCREW CBRIT...

Page 53: ...1085 MAIN BOARD INSERT FB710220 MOF 3W M A 5 22ohm R132 1 1086 MAIN BOARD INSERT FB470561 MOF 1W M A 5 560ohm R140 1 1087 MAIN BOARD INSERT FB470103 MOF 1W M A 5 10K R150 1 1088 MAIN BOARD INSERT FB9...

Page 54: ...RT 12800171 HEAT SINK 45 27 60 U401 1 1138 MAIN BOARD INSERT 80001041 IC LINEAR TDA8172 7PIN U401 1 1139 MAIN BOARD INSERT 14000041 SCREW P 2CBRTS 3 8 15BF U401 1 1140 MAIN BOARD INSERT 80005271 OTP M...

Page 55: ...CKET R 1 1188 SET ASSY 12000301 BRACKET CABLE 1 1189 SET ASSY 12000441 BRACKET PWB ASSY 1 1190 SET ASSY 12300181 PLATE SHIELDING VIDEO 1 1191 SET ASSY 14000011 SCREW 2CBRITS 4 16 15BF 7 1192 SET ASSY...

Page 56: ...EET 4 25 SET ASSY 80006241 WIRE GND 1015 18AWG L 160mm BLACK BLACKET CRT 1 26 SET ASSY 80001651 POWER CORD 3P 1 8M EUROPE NON SHIELD COLOR SG8508 CTOA6 CORD POWER 1 27 SET ASSY 80006691 CRT 19 LG M46Q...

Page 57: ...00271 SPACER SUPPROT PS 26GD 4 61 SET ASSY 14000011 SCREW 2CBRITS 4 16 15BF 7 62 SET ASSY R0315A04 CABLE TIE L 100mm W 2 5mm 9 63 SET ASSY 14000071 SCREW PL CPTS 3 8 15BF 15 64 SET ASSY 11000381 REVOL...

Page 58: ...17000291 CUSHION SHEET 4 25 SET ASSY 80006241 WIRE GND 1015 18AWG L 160mm BLACK BLACKET CRT 1 26 SET ASSY 80001631 POWER CORD 3P 1 8M NON SHIELD W COLOR SG8508 CORD POWER 1 27 SET ASSY 80003541 CRT 19...

Page 59: ...GD 4 60 SET ASSY R0315A04 CABLE TIE L 100mm W 2 5mm 7 61 SET ASSY 14000011 SCREW 2CBRITS 4 16 15BF 7 62 SET ASSY 14000071 SCREW PL CPTS 3 8 15BF 15 63 SET ASSY 11000381 REVOLVING STAND ASSY 94HB OR 64...

Page 60: ...NG STAND T 1 25 REVOLVING STAND ASSY 17000291 CUSHION SHEET 4 26 SET ASSY 80006241 WIRE GND 1015 18AWG L 160mm BLACK BLACKET CRT 1 27 SET ASSY 80001631 POWER CORD 3P 1 8M NON SHIELD W COLOR SG8508 COR...

Page 61: ...ASSY 18000271 SPACER SUPPROT PS 26GD 4 62 SET ASSY 14000011 SCREW 2CBRITS 4 16 15BF 7 63 SET ASSY R0315A04 CABLE TIE L 100mm W 2 5mm 7 64 SET ASSY 14000071 SCREW PL CPTS 3 8 15BF 15 65 SET ASSY 11000...

Page 62: ...AUDIO BASE ASSY R0315A04 CABLE TIE L 100mm W 2 5mm 2 25 AUDIO BASE ASSY 14000031 SCREW 2CBRITS 4 12 15BF 6 26 AUDIO BASE ASSY 12000431 BRACKET SP 2 27 AUDIO BASE ASSY 15200771 LABEL SERIAL NO 1 28 AU...

Page 63: ...031 BAG POLYETHYLENE 150 370 1 80 PACKING ASSY 13700071 PE BAG 500 480 850 WARNING 1 81 PACKING ASSY 15500631 OWNERS MANUAL AS50 AS70 AS90 1 1 82 PACKING ASSY 15800051 SAFETY INSTRUCTION SHEET 1 83 PA...

Page 64: ...W PL CPIMS 4 10 15BF 3 121 SET ASSY 12000441 BRACKET PWB ASSY 1 122 SET ASSY 12000402 BRACKET L 1 123 SET ASSY 12000412 BRACKET R 1 124 SET ASSY 12000601 BRACKET CABLE 1 125 SET ASSY 12300181 PLATE SH...

Page 65: ...SS CONTROL Q329 Q323 VR304 Horizontal Driver Output T301 Q315 Q316 High Voltage Generator T302 G2 G4 2 H DY Video Pre AMP U201 R G B Input OSD Process U202 H H V V AC Input Micro Processor U701 PS1 PS...

Page 66: ...63 SCHEMATIC 1 Video Board All manuals and user guides at all guides com a l l g u i d e s c o m...

Page 67: ...64 2 Main Board All manuals and user guides at all guides com...

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