NEC MultiSync 95F-1 Service Manual Download Page 28

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N9902 Theory of circuit operation

This monitor contains the following blocks

Page

1.Power Supply .................................................................................................................................. 26

2.Video Circuit & OSD ....................................................................................................................... 26

3.Micro Controller System ................................................................................................................. 26

4.Vertical Deflection ........................................................................................................................... 27

5.Horizontal Deflection ....................................................................................................................... 27

6.FBT Secondary & Dynamic Focus .................................................................................................. 28

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Summary of Contents for MultiSync 95F-1

Page 1: ...Sync 95F 1 AccuSync 95F 1 COLOR MONITOR SERVICE MANUAL Better Service Better Reputation Better Profit MITSUBISHI NEC MITSUBISHI ELECTRIC VISUAL SYSTEMS All manuals and user guides at all guides com a...

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: ...ASSEMBLY 5 ADJUSTMENT SPECIFICATIONS 6 TROUBLE SHOOTING 16 THEORY OF CIRCUIT DESCRIPTION 25 REPLACEMENT PARTS LIST 1 MultiSync 95F 29 2 AccuSync 95F Difference List 54 BLOCK DIAGRAM 56 SCHEMATIC 57 1...

Page 4: ...105 Hz 1280 1024 55 to 90 Hz 1600 1280 55 to 76 Hz Some systems may not support all modes listed NMV cites recommended resolution at 85 Hz for optimal display performance Active Display Area Factory S...

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: ...11 12 13 14 15 16 17 18 Format N N N N N N N N _ Y M S S S S S F R Example N A 5 0 0 0 8 T _ 0 6 0 0 0 0 1 Y A 15 3 EDID data file 1 EDID Serial No Format 1 MS95F 1 Week of Manufacture Month 4 Year of...

Page 19: ...using this chart TABLE OF CONTENTS Page 1 NO OPERATION POWER LED FLASH 17 2 NO OPERATION POWER LED OFF 18 3 VIDEO NOISE UNSYNCHRONOUS 19 4 NO VIDEO 20 5 NO RASTER 21 6 TROUBLE IN H V SYNC 22 7 PINCUS...

Page 20: ...17 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...

Page 21: ...COPE 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 VCC PIN 4 S...

Page 22: ...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 19 All...

Page 23: ...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 24: ...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 25: ...Q701 Q702 CHECK 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 TROUB...

Page 26: ...N PARABOLA WAVE CHECK U301 PIN 24 PARABOLA TROUBLE IN U301 CHECK C350 Q332 R30V R30W CHECK Q309 Q311 NO NO YES YES YES 23 7 PINCUSHION POOR All manuals and user guides at all guides com a l l g u i d...

Page 27: ...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 28: ...tor contains the following blocks Page 1 Power Supply 26 2 Video Circuit OSD 26 3 Micro Controller System 26 4 Vertical Deflection 27 5 Horizontal Deflection 27 6 FBT Secondary Dynamic Focus 28 25 All...

Page 29: ...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 30: ...L L Adj data 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 con...

Page 31: ...d Q327 respectively So different frequency has different combination to meet the requirement 28 6 FBT Secondary Dynamic Focus a Focus and screen voltage are come from FBT bleeder b G1 bias is controll...

Page 32: ...IC CNT BOARD PCB2 1 26 CNT BOARD A I EAA09456 TR NPN 2SC945P TO 92 T Q120 1 27 CNT BOARD A I 80003231 TR NPN KTC945 P TO 92 T Q120 OR 28 CNT BOARD A I EBA07336 TR PNP 2SA733P TO 92 T Q121 1 29 CNT BOA...

Page 33: ...B T 100P 500V K C287 1 78 CRT BOARD A I GA322715 ELECT 85oC T 220u 10V M C288 1 79 CRT BOARD A I GA310715 ELECT 85oC T 100u 10V M C289 1 80 CRT BOARD A I GB210458 CERAMIC Y5V T 0 1u 50V Z C290 1 81 CR...

Page 34: ...UMPER WIRE AI T 10mm J12 1 133 CRT BOARD A I R0319112 JUMPER WIRE AI T 7 5mm J13 1 134 CRT BOARD A I R0319112 JUMPER WIRE AI T 7 5mm J14 1 135 CRT BOARD A I R0319112 JUMPER WIRE AI T 7 5mm J15 1 136 C...

Page 35: ...R215 1 184 CRT BOARD A I FA240101 CARBON 1 4W T 5 100ohm R216 1 185 CRT BOARD A I FA040102 CARBON 1 8W T 5 1K R217 1 186 CRT BOARD A I FA040224 CARBON 1 8W T 5 220K R218 1 187 CRT BOARD A I FA330103 C...

Page 36: ...10K R289 1 238 CRT BOARD A I FA040103 CARBON 1 8W T 5 10K R290 1 239 CRT BOARD A I FA040100 CARBON 1 8W T 5 10ohm R293 1 240 CRT BOARD A I FA040105 CARBON 1 8W T 5 1M R294 1 241 CRT BOARD A I FA04056...

Page 37: ...322735 ELECT 85oC T 220u 25V M C137 1 292 MAIN BOARD A I GA347725 ELECT 85oC T 470u 16V M C141 1 293 MAIN BOARD A I GF210362 MEF CAP BOX 0 01u 63V J C142 1 294 MAIN BOARD A I GA310725 ELECT 85oC T 100...

Page 38: ...F233362 MEF CAP BOX 0 033u 63V J C327 1 344 MAIN BOARD A I GF233352 MEF CAP BOX 0 033u 50V J C327 OR 345 MAIN BOARD A I GF233372 MEF CAP BOX 0 033u 100V J C327 OR 346 MAIN BOARD A I GA310655 ELECT 85o...

Page 39: ...0458 CERAMIC Y5V T 0 1u 50V Z C402 1 397 MAIN BOARD A I GF210462 MEF CAP BOX 0 1u 63V J C403 1 398 MAIN BOARD A I GF210452 MEF CAP BOX 0 1u 50V J C403 OR 399 MAIN BOARD A I GF215462 MEF CAP BOX 0 15u...

Page 40: ...I EJ044148 DIODE T 1N4148 D307 1 449 MAIN BOARD A I EJA00018 DIODE T 1A UF4006 D308 1 450 MAIN BOARD A I EJA20003 DIODE T 1A BA159 D309 1 451 MAIN BOARD A I EJA20003 DIODE T 1A BA159 D310 1 452 MAIN B...

Page 41: ...319112 JUMPER WIRE AI T 7 5mm J125 1 503 MAIN BOARD A I R0319113 JUMPER WIRE AI T 10mm J126 1 504 MAIN BOARD A I R0319114 JUMPER WIRE AI T 12 5mm J127 1 505 MAIN BOARD A I R0319117 JUMPER WIRE AI T 20...

Page 42: ...IN BOARD A I R0319112 JUMPER WIRE AI T 7 5mm J172 1 556 MAIN BOARD A I R0319112 JUMPER WIRE AI T 7 5mm J173 1 557 MAIN BOARD A I R0319112 JUMPER WIRE AI T 7 5mm J174 1 558 MAIN BOARD A I R0319112 JUMP...

Page 43: ...1 608 MAIN BOARD A I R0319113 JUMPER WIRE AI T 10mm J44 1 609 MAIN BOARD A I HC006002 BEAD 3 5X4 7 T J45 1 610 MAIN BOARD A I R0319113 JUMPER WIRE AI T 10mm J46 1 611 MAIN BOARD A I R0319117 JUMPER W...

Page 44: ...19112 JUMPER WIRE AI T 7 5mm J92 1 662 MAIN BOARD A I R0319114 JUMPER WIRE AI T 12 5mm J93 1 663 MAIN BOARD A I R0319116 JUMPER WIRE AI T 17 5mm J94 1 664 MAIN BOARD A I R0319116 JUMPER WIRE AI T 17 5...

Page 45: ...RD A I EAA09456 TR NPN 2SC945P TO 92 T Q320 1 715 MAIN BOARD A I 80003231 TR NPN KTC945 P TO 92 T Q320 OR 716 MAIN BOARD A I EAA09456 TR NPN 2SC945P TO 92 T Q321 1 717 MAIN BOARD A I 80003231 TR NPN K...

Page 46: ...0K R113 1 767 MAIN BOARD A I FA240390 CARBON 1 4W T 5 39ohm R115 1 768 MAIN BOARD A I FA330271 CARBON 1 2W T 5 270ohm R116 1 769 MAIN BOARD A I FA240470 CARBON 1 4W T 5 47ohm R117 1 770 MAIN BOARD A I...

Page 47: ...0 MAIN BOARD A I FA040682 CARBON 1 8W T 5 6 8K R30E 1 821 MAIN BOARD A I FA040472 CARBON 1 8W T 5 4 7K R30F 1 822 MAIN BOARD A I FA040302 CARBON 1 8W T 5 3K R30G 1 823 MAIN BOARD A I FA040103 CARBON 1...

Page 48: ...IN BOARD A I FA040104 CARBON 1 8W T 5 100K R32N 1 874 MAIN BOARD A I FA040472 CARBON 1 8W T 5 4 7K R32P 1 875 MAIN BOARD A I FA330474 CARBON 1 2W T 5 470K R32R 1 876 MAIN BOARD A I FA040103 CARBON 1 8...

Page 49: ...BOARD A I FA040100 CARBON 1 8W T 5 10ohm R384 1 927 MAIN BOARD A I FA040103 CARBON 1 8W T 5 10K R388 1 928 MAIN BOARD A I FA040104 CARBON 1 8W T 5 100K R389 1 929 MAIN BOARD A I FA040684 CARBON 1 8W...

Page 50: ...4 7K R746 1 980 MAIN BOARD A I FA040472 CARBON 1 8W T 5 4 7K R747 1 981 MAIN BOARD A I FA040472 CARBON 1 8W T 5 4 7K R748 1 982 MAIN BOARD A I FA040472 CARBON 1 8W T 5 4 7K R749 1 983 MAIN BOARD A I F...

Page 51: ...NSERT GFB47482 PLASTIC MPP A 0 47u 250V J C346 1 S 1033 MAIN BOARD INSERT GFB12482 PLASTIC MPP A 0 12u 250V J C347 1 H 1034 MAIN BOARD INSERT GFB22482 PLASTIC MPP A 0 22u 250V J C347 1 S 1035 MAIN BOA...

Page 52: ...N9902 N9702 L302 1 1085 MAIN BOARD INSERT HB000019 CHOKE COIL 130uH 18X20 L304 1 S 1086 MAIN BOARD INSERT 80007011 CHOKE COIL 150uH 18X20 L304 1 H 1087 MAIN BOARD INSERT 80009201 CHOKE 45uH 16 22 MS95...

Page 53: ...2W A 5 0 22ohm R111 1 1138 MAIN BOARD INSERT FB470103 MOF 1W M A 5 10K R114 1 1139 MAIN BOARD INSERT FB470153 MOF 1W M A 5 15K R122 1 1140 MAIN BOARD INSERT FB470100 MOF 1W M A 5 10ohm R127 1 1141 MAI...

Page 54: ...3631 THERMISTOR PTCR 9ohm 2P DGC2R9ROM27C TH102 1 1191 MAIN BOARD INSERT R0224074 SINGLE PIN L 11 5mm D 1 0 TP1 1 1192 MAIN BOARD INSERT R0224074 SINGLE PIN L 11 5mm D 1 0 TP2 1 1193 MAIN BOARD INSERT...

Page 55: ...SSY HA030010 EMI FILTER COIL 20 10 10 FBT G2 1 JVC FBT 1242 SET ASSY HA030010 EMI FILTER COIL 20 10 10 FBT G4 1 JVC FBT 1243 SET ASSY 80011321 WIRE BRAIDED 0 12 120C 180mm FBT CRT 1 1244 SET ASSY 8000...

Page 56: ...SHER D20 M6 T2 4 1282 SET ASSY 18000271 SPACER SUPPROT PS 26GD 4 1283 SET ASSY 14000011 SCREW 2CBRITS 4 16 15BF 6 1284 SET ASSY R0315A04 CABLE TIE L 100mm W 2 5mm 8 1285 SET ASSY 14000071 SCREW PL CPT...

Page 57: ...1 25 REVOLVING STAND ASSY 11000261 REVOLVING STAND T 1 26 REVOLVING STAND ASSY 17000291 CUSHION SHEET 4 27 SET ASSY 80001631 POWER CORD 3P 1 8M NON SHIELD W COLOR SG8508 CORD POWER 1 28 SET ASSY 80008...

Page 58: ...64 SET ASSY 14600011 SCERW SPECIAL 5 25 4 65 SET ASSY 14800011 SPECIAL WASHER D20 M6 T2 4 66 SET ASSY 18000271 SPACER SUPPROT PS 26GD 4 67 SET ASSY 14000011 SCREW 2CBRITS 4 16 15BF 6 68 SET ASSY R0315...

Page 59: ...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 60: ...1K D319 1N4936 R341 51K 8 7 6 5 4 3 2 1 NC NC NC NC SDL SCL WP VCC 24C04 U702 C329 250V MEF 0 1u D317 RG4A C945 Q322 R422 22K C310 NC R158 220 C603 Y5P 0 01u R397 100K R753 4 7K R388 10K D324 RG4A D3...

Page 61: ...1 S274 2 1 R276 100 C277 1u NC C279 NC C278 R299 100 R275 100 8 1 S272 R297 5 6K R296 6 8K R295 5 6K C280 100P SL FOCUS 8 6 4 5 3 9 7 KB KG KR CRT G1 G2 H V C271 N C R293 150 C291 01u MEF R294 1M C284...

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