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NEC MultiSync 75F-3 Service Manual

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COLOR MONITOR

SERVICE MANUAL

MODELS
/MITSUBISHI
NEC-MITSUBISHI ELECTRIC VISUAL SYSTEMS
MultiSync 75F-3
AccuSync 75F-3
(N0701-3)
Better Service
Better Reputation
Better Profit

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Table of Contents
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  Summary of Contents for NEC MultiSync 75F-3

  • Page 1: Service Manual

    MODELS MultiSync 75F-3 AccuSync 75F-3 (N0701-3) COLOR MONITOR SERVICE MANUAL Better Service Better Reputation Better Profit /MITSUBISHI NEC-MITSUBISHI ELECTRIC VISUAL SYSTEMS...
  • Page 2 W A R N I N G The SERVICE PERSONNEL should have the appropriate technical training knowledge and experience necessary to : ž Be familiar with specialized test equipment, and ž Be careful to follow all safety procedures associated with high voltage CRT circuit designs to minimize danger to themselves and their coworkers.
  • Page 3: Table Of Contents

    CONTENTS Page No. PRECAUTIONS ........................1 SPECIFICATIONS ........................3 PIN ADJUSTMENT TABLE ..................... 4 CONTROLS ..........................5 ON-SCREEN MANAGER(OSM) ..................... 6 SERIAL NUMBER INFORMATION ..................11 DISASSEMBLY ........................12 ADJUSTMENT PROCEDURES ................... 13 WRITE AND INSPECTION FOR PLUG AND PLAY COMMUNICATION ......26 TROUBLE SHOOTING ......................
  • Page 4: Precautions

    Precautions Follow these safety and servicing precautions to prevent damage and to protect against potential hazards such as electrical shock and X-rays. 1.1 Safety Precautions 1-1-1 Warnings 1. For safety purpose, do not attempt to modify the circuit board, and always disconnect the AC power before performing servicing on the monitor.
  • Page 5 Figure 1-1. Set Up For AC Leakage Current Check To exposed metal To known Cabinet part Earth ground 0.15ufd 1500 ohm 10 watt c) Reverse the AC plug at the AC outlet and repeat the steps for AC voltage measurements for each exposed metal part.
  • Page 6: Specifications

    832 × 624 @ 55 to 106 Hz vertical frequencies only 1024 × 768 @ 55 to 87 Hz …… NEC-Mitsubishi Electronics Display cites 1152 × 870 @ 55 to 77 Hz recommended resolution at 85 Hz for optimal 1280 × 1024 @ 55 to 66 Hz display performance.
  • Page 7: Pin Adjustment Table

    PIN ASSIGNMENT PIN NO. Mini D-SUB-15P GREEN BLUE GROUND GROUND RED GROUND GREEN GROUND BLUE GROUND +5V in GROUND GROUND H.SYNC. V.SYNC.
  • Page 8: Controls

    CONTROLS  ”SELECT”: To display OSM windows, mode changes, or activate the degaussing or OSM window color selection. ‚ CONTROL BUTTON (-,+): Without OSM — Adjust the contrast. With OSM — Select icon and adjust. ƒ ”RESET”: Return the adjustment item to the factory setting. „...
  • Page 9: On-Screen Manager(Osm)

    OSD OPERATION FUNCTION VALUE ADJUSTMENT If OSD off, press UP key to increase Contrast value, press DOWN key to decrease Contrast value. press SELECT key to display OSD and Brightness icon is active (Fig. 1) Fig. 1 Press UP key or DOWN key to select icon right or left and the selected icon display red color If selected icon is DAC out, press SELECT key will display DAC value bar (fig 2) Fig.
  • Page 10: 3. Osd Color Select

    2. Color Temperature Select If selected icon is 9300/7500/6500/user color icon, press SELECT key to select Color Temperature for 9300, 7500, 6500 or user defined (Fig 4 – 7). Fig. 4 Fig. 5 Fig. 6 Fig. 7 3. OSD Color Select If OSD icon is selected, press SELECT key to change OSD color, there are three kinds of OSD color can be selected (Fig.
  • Page 11 5. Factory mode Press SELECT key + UP key and power on, system enter factory mode. OSD will display “FA” to indicate in factory mode (Fig. 12 – 13). Fig. 12 Fig. 13 Operation of factory mode is same as normal mode except below 2 condition: a.
  • Page 12 Function explanation OSD(On-screen Display) control buttons on the front of the monitor function as follows: SELECT Enters and exits the OSD menu. − / + − / + − / + − / + − / + Selects one of the controls and increases or decreases the adjustment. RESET Resets the highlighted control to the factory Setting.
  • Page 13 Degauss: Select the degauss icon on “Icon select window” and push “SELECT” button. It will eliminate the stray magnetic field and correct the scan of the electron beam, which affect the purity, focus, convergence. Note: Allow a minimum interval of 20 minutes to elapse between uses of the degauss function. 9300K Color Temperature: Select the Color Temperature icon on “Icon Select Window”...
  • Page 14: Serial Number Information

    SERIAL NUMBER INFORMATION Refer to the serial number information shown below. Ex.) SERIAL NUMBER LABEL MODEL MS75F/AS75F SERIAL No. ∗∗∗∗∗∗∗∗∗ X 0 0 0 Manufactured Year : ( Last digit ) Manufactured Month : January to September 1 to 9 00001 ~ on ward October (Start from 00001 ~ when...
  • Page 15: Disassembly

    DISASSEMBLY Cabinet Back Cabinet Back 1. Turn the monitor CRT face down on a clean static free surface to prevent scratching CRT face. 2. Remove the screw “b”. 3. Raise the signal cable vicinity of a cabinet back and lightly hit part (figure 1 reference) of a top of the cabinet back and remove the cabinet back.
  • Page 16: Adjustment Procedures

    ADJUSTMENT SPECIFICATIONS TABLE OF CONTENTS Page (1) Adjustment & Inspection Tools ......................14 (2) Timing Table ............................. 14 (3) Definition for Normal Condition ......................14 (4) Hot Key Operation ..........................14 (5) B+ Adjustment ..........................15 (6) X-ray Test ............................15 (7) H.V.
  • Page 17: Adjustment & Inspection Tools

    Ver. 1.0 AS75F/MS75F Adjustment Specifications 2001,10,3 (1) Adjustment & Inspection Tools: (A) Color Analyzer (B) Signal Generator CHAROMA 2135 (C) Multi Meter (D) Hi-Voltage Probe (E) Convergence Meter (F) Demagnetizer Probe (G) Power Meter (H) Automatic Alignment System (I) DDC write & inspection system (2) TIMING TABLE(Factory Mode -20 MODES) M O D E R ES O LU T IO N...
  • Page 18: B+ Adjustment

    (C) Auto Function Test Mode : UP (+) Key if pressed when the power SW on. Mode 1: Out put the maximum and minimum value of DAC for each control if the video signal comes in. Mode 2: Out put the Cross Hatch Pattern for 1 munites if the Signal Cable is not connected (5) B+ Adjustment (A) MODE: No.
  • Page 19: (B) Cut Off Adjustment

    (B) Cut Off Adjustment 1. Select the color Mode 9300K 2. Cut Off Adjustment: Video Signal Off (0.vp-p), Bright Control set to Mex., Adjust the G2, at the Brightness 1~1.5FL. (3.4~5.1 cd/m2) 3. Adjust VR210, VR230 and VR250 to make X=283, Y=297, with readjusting G2 to keep the brightness between 1~1.5FL (3.4~5.1 cd/m2).
  • Page 20: Geometry Adjustment

    (C) Inspection 1. It should be into power off Mode when the both horizontal sync and vertical sync are disable after 4 sec. Check the LED color “Orange” and the power consumption must be less than 5W. 2. The picture should be recovered readable within 3 seconds when the both horizontal sync and vertical sync are enable.
  • Page 21: Setting Before Shipment

    (15) Setting Before Shipment Color Temp 9300K OSD Back Ground: Blue OSD Position: Center of the screen Contrast: Maximum Brightness: Preset H. V moire cancel function: Minimum Self test pattern: Cross Hatch Pattern for 1 munites, if the Signal Cable is not connected. (Select the “P2”...
  • Page 22: Timing Sheet

    (17) TIMING SHEET Rev1.0 P re s e t M o d e N o . V G A 3 5 0 V G A 4 0 0 V G A 4 8 0 M A C II 8 0 0 *6 0 0 8 5 1 4 /A S ig n a l N a m e (3 5 K )
  • Page 23 P re s e t M o d e N o . 6 4 0 *4 8 0 E V G A 4 0 0 8 0 0 *6 0 0 6 4 0 *4 8 0 8 0 0 *6 0 0 1 0 *7 (6 0 ) S ig n a l N a m e (7 5 )
  • Page 24 P re s e t M o d e N o . M A C II 8 0 0 *6 0 0 1 0 *7 (7 0 ) 1 0 *7 (7 5 ) 1 2 *1 0 (6 0 ) S ig n a l N a m e 640*480 (4 9 .7 K )
  • Page 25 P re s e t M o d e N o . 1 0 2 4 *7 6 8 S ig n a l N a m e 800*600 (8 5 ) (100) 1 0 2 4 *7 6 8 R e s o lu tio n 800*600 9 4 .5...
  • Page 26: Distortion Adjustment

    Distortion Adjustment Factory Mode Setting *After completion of adjustment exit the factory mode and data will be saved. Signal : All signals Cross hatch Perform the adjust for signal No. 14 in step 6-1~3. Perform the adjust for above all signal in step 6-4,5. 1.
  • Page 27 4. Side Pincushion Adjustment (1) When OSM MENU is displayed, Select the “ “ icon. (2) Make sure that the side pincushion distortion meets the following standards. 1.5mm 1.8mm 1.8mm 1.8mm 1.8mm 1.8mm 1.8mm 1.5mm 5. Trapezoid Distortion Adjustment (1) When OSM MENU is displayed, Select the “ “...
  • Page 28 7. Purity (1) Receive signal 14(Cross hatch pattern). (2) The CRT face should be facing east and degauss the entire unit by external degaussing coil. (3) Make sure the single color purity. If not, readjust CPC magnet and touch up using correction magnets. 8.
  • Page 29: Write And Inspection For Plug And Play Communication

    Write and Inspection for Plug and Play Communication 1. C onstruction of System This system should be connected as shown below. Program Disk Monitor Signal Cable Fixture Power Cable Note: PC clock speed should be below 266MHz. OS is PC-DOS. Fixture Board can be connected directly to PC without Printer Cable.
  • Page 30 3. EDID DATA FILE (1) EDID Serial No. Format MultiSync 75F Week of Manufacture (Month*4) Year of Manufacture Serial No Area 9bytes Check Sum AccuSync 75F Week of Manufacture (Month*4) Year of Manufacture Serial No Area 9bytes Check Sum (2) Bar Code Format(code39) MS75F Digit 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20...
  • Page 31 Serial No. Descriptions: Y: Manufactured Year (Last digit) ex. 1 à 2001 M: Manufactured Month 1 ~ 9, X(October), Y(Novenber), Z(December) S: Serial No. ( 5digits) 00001 ~ onward (restart when month is changed) F: Factory Code: Y is NPG China Factory R: Product Revision code: start from J EDID Code Input Procedure 1) Scan Bar code (20 digits)
  • Page 32: Trouble Shooting

    TROUBLE SHOOTING Refer to User’s Manual trouble shooting section before using this chart. TABLE OF CONTENTS Page 1. NO OPERATION, POWER LED FLASH ..................30 2. NO OPERATION, POWER LED OFF ................... 31 3. VIDEO NOISE, OUT OF SYNC ..................... 32 4.
  • Page 33: No Operation, Power Led Flash

    1. NO OPERATION, POWER LED FLASH POWER LED FLASH POWER SW TURN OFF MULTIMETER TEST Q307, U302 D110,D111,D112,D113 1. DC P/S O/P VOLTAGE SET AT 12V,CURRENT SET AT 600MA. POSITIVE CONNECT TO C330”+”. NEGATIVE CONNECT TO U302-pin 7. 2. SCOPE SET AT 10V/DIV, 10US/DIV, PROBE CONNECT TO Q319-GATE AND U302pin 6.
  • Page 34: No Operation, Power Led Off

    2. NO OPERATION, POWER LED OFF POWER SW TURN OFF CHECK F101 CHECK Q101 DC P/S O/P VOLTAGE SET AT 17V,CURRENT SET AT 200MA. POSITIVE CONNECT TO C109”+”. NEGATIVE CONNECT TO C105”-“. SCOPE SET AT 10V/DIV, 10US/DIV, PROBE CONNECT TO Q101-GATE AND C105”-“. CHECK U101 CHECK...
  • Page 35: Video Noise, Out Of Sync

    3. VIDEO NOISE, UNSYNCHRONOUS CHECK Q101 G-S FREQUENCY CHECK C114, R116 CHECK HORIZONTAL SYNCRONIZE D109, R115, R117 FREQUENCY C114 TO GND WITH H-SYNC CHECK Q319 G-S FREQUENCY CHECK HORIZONTAL CHECK R30X, FBT SYNCRONIZE FREQUENCY C359 TO GND PIN6 WITH H-SYNC NORMAL OPERATION...
  • Page 36: No Video

    4. NO VIDEO NO VIDEO CHECK REFER TO SCREEN CONTROL “NO RASTER” CLOCKWISE ON PAGE CHECK TROUBLE IN U201 PIN 5, 8, 11 R/G/B SIGNAL, SIGNAL LEVEL SIGNAL CABLE CHECK PROBLEM IN U201 U201 PIN 18, 20, 23 CLAMP(PIN 15) SIGNAL LEVEL U201 12V VOLTAGE CHECK...
  • Page 37: No Raster

    5. NO RASTER NO RASTER POWER SUPPLY CHECK CHECK CHECK PROBLEM IN U302 PIN 14, 15 MCU U701 H/V SYNC CHECK PROBLEM IN U302 PIN 18, 19, 8 U701, U302 SYNC CHECK PROBLEM IN T301 PIN 3 VOLTAGE U302, Q319, D335, L304 56V, 68V(AT H-FREQ.
  • Page 38: Trouble In H.v Sync

    6. TROUBLE IN H. V SYNC PROBLEM IN HOR. OR VER. SYNC CHECK PROBLEM IN CONNECTOR S702 (PIN4, 5), SIGNAL SIGNAL CABLE CHECK PROBLEM IN U701(PIN 40,39) H/V SYNC LINE & H/V SYNC. Q301, Q401 SIGNAL CHECK CHECK PROBLEM IN U701(PIN 32,33) U701(PIN 5) 5V LINE...
  • Page 39: Pincushion Poor

    7. POOR PINCUSHION POOR PINCUSHION CHECK U301, PARABOLA Q316~Q318 WAVE CHECK U302 PIN 11 CHECK R390, U301 PARABOLA CHECK U302 PIN 14 CHECK 12V & U302 SYNC INPUT CHECK U701 (PIN 32) OUTPUT...
  • Page 40: Circuit Description

    CIRCUIT DESCRIPTION TABLE OF CONTENTS Page 1. Power supply circuit ........................38 2. MCU ..............................41 3. Horizontal deflection signal processing/Vertical and geometrical compensation of the raster ..57 4. Horizontal drive and power supply output ..................69 5. Horizontal amplitude control ......................70 6.
  • Page 41: Power Supply Circuit

    Power supply circuit  Outline This power supply unit adopts the switching mode technology, and is an off-line mode type unit that provided several different DC outputs. The scanning frequency is available in different values ranging from 31 kHz to 69 kHz. Moreover, it is capable to operate at an AC input voltage of 100V ~ 240V and an ±...
  • Page 42 2) The power supply MOS FET Q101 carries out the ON/OFF operation of the control unit, by means of U101 KA3842A. KA3842A is a PWM (pulse width modulation) IC chip, with 16 V starting voltage and 10 V cut-off voltage. The following list shows the pin layout of KA3842A pulse width modulation IC chip.
  • Page 43 ‡ Power saving Suspend mode : Every DC voltage operation of the CRT is turned OFF. The color of the power LED101 switches from green to orange. OFF mode : This is the mode in which the CPU control unit turns OFF the power supply, but the power turns ON when the user touches the keyboard.
  • Page 44: Mcu

    Monitor MCU Specification Frequency Specification H-freq. : 29.5K – 70KHz V-freq. : 43 – 160Hz Judge polarity only when frequency is 31.5 KHz and 37.8 KHz Support composite sync detection System Architecture MCU – Weltrend WT6232, 32K bytes ROM size EEPROM –...
  • Page 45 3. Power saving – 2 pins (PMUS, PMUO) for power saving control – if Hf > 70KHz or Hf < 23KHz, enter power saving mode (suspend). – enter power saving mode after 3 sec when condition met. – enter suspend mode first for 3 sec before enter off mode if off mode condition met. Mode H-sync freq.
  • Page 46 IIC interface 1. DDC1/DDC2B – VESA DDC1/DDC2B is supported. 2. Auto alignment – I²C auto alignment protocol is supported. Timing Table Total 24 modes. 1. Factory mode – 20 modes ‘*’ indicate do not care. Mode Resolution H-sync. V-sync. H polarity V polarity VGA 350 31.5KHz 70Hz...
  • Page 47 GENERAL DESCRIPTION The WT62P1 is a microcontroller for digital controlled monitor with Universal Serial Bus (USB) interface. It contains an 8-bit CPU, 32K bytes flash memory, 512 bytes RAM, 14 PWMs, parallel I/Os, SYNC signal processor, timer, DDC1/2B interface, master/slave I²C interface, low speed USB device module, 6-bit A/ D converter and watch-dog timer.
  • Page 48: Pin Configuration

    PIN CONFIGURATION 42-pin PDIP 42-pin SPDIP 40-pin PDIP PWM2 PWM2 PWM1 PWM1 PWM0 PWM0 PWM3 PWM3 RESET/3V3 RESET/3V3 PD5/PWM4 PD5/PWM4 PD4/PWM5 PD4/PWM5 PD3/PWM6 PD3/PWM6 PD2/PWM7 PD2/PWM7 OSCO OSCO OSCI PD1/HOUT OSCI PD1/HOUT PB5/SDA2 PD0/VOUT PB5/SDA2 PD0/VOUT WT62P1-N42 PB4/SCL2 PA7/PWM13/CLAMP PB4/SCL2 PA7/PWM13/CLAMP WT62P1-N40 WT62P1-K42...
  • Page 49 PIN DESCRIPTION Pin No. Pin Name Descriptions 40 42 40 28 - D+ O USB D+ signal. - PWM2 O PWM2 output (10V open-drain). - PWM1 O PWM1 output (5V open-drain). - PWM0 PWM0 output (5V open-drain). 8 /RESET/3V3 Reset input and +3.3V regulator output for USB tranceiver power supply. 9 VDD +5V power supply.
  • Page 50 FUNCTIONAL DESCRIPTION 8-bit 6502 compatible CPU operates at 6MHz. Address bus is 16-bit and data bus is 8-bit. The non-maskable interrupt (/NMI) of 6502 is modified to be maskable and is defined as INT0 with higher priority. The interrupt request (/IRQ) of 6501 is defined as INT1 with lower priority. Please refer the 6502 reference menu for more detail.
  • Page 51 RESET/3V3 LATCH Watchdog Timer Reset Low VDD Reset Peripheral Circuits Address 2.048ms Illegal Address Reset 6MHz Timer Fig. 1 Reset Signals External Reset A low level on the RESET/3.3V pin will generate reset. Illegal address Reset When the address bus of CPU goes to illegal address, a reset pulse will be generated. The illegal address is defined as $0040h~$007Fh, $0300h~$0FFEh and $1000h~$7FFFh.
  • Page 52 I/O Port I/O Port A Pin PA0 and PA1 are shared with DDC interface SDA1 and SCL1 When ENDDC bit is “0”, These two pins becomes I/O port. If PA0OE bit is set, Pin PA0 is an open-drain output. If PA0OE is cleared, Pin PA0 is an input pin with no internal pull-up resistor.
  • Page 53 SYNC Processor The functional block diagram of SYNC Processor is shown in Fig. 4. It contains H and V polarity detection circuit, H and V frequency counter, composite sync signal separation circuit, free-running H and V sync signal generator, vedio signal generation circuit for burn-in test and clamp pulse generator. Fig.4 Block diagram of sync signal processor Horizontal Polarity Detect The horizontal polarity is detected by sampling HIN signal at 5.5~6.5us after rising and falling edge of HIN.
  • Page 54 Composite Sync Signal Separator Composite sync signal separator extract Vsync signal from HIN or SOGIN input pin by filtering pulses which is less than 6us. The output Vsync signal will be widened about 5.5~6.5us. The output Hsync will be replaced by 2us pulse during Vsync pulse. The composite sync signal separator can handle H+V and H exclusive OR V signals.
  • Page 55 Free-running sync signal and self-test pattern The self-generated free run sync signals are output from HOUT and VOUT pins when ENFREE bit is set. Four kinds of standard VESA timings are selected by FREE1 and FREE0 bits. Self-test pattern signal is output form PAT pin when ENPAT bit is set. PAT1 and PAT0 bits select different self-test pattern.
  • Page 56 DDC Flow Chart...
  • Page 57 Master I²C Flow Chart...
  • Page 58 Master I²C (restart mode) Flow Chart...
  • Page 59 Slave I²C Flow Chart...
  • Page 60: Horizontal Deflection Signal Processing/Vertical And Geometrical Compensation Of The Raster

    3. Horizontal deflection signal processing / Vertical and geometrical compensation of the raster I²C-bus autosync deflection controller for PC monitors TDA4857 FEATURES Vertical section Concept features § I²C-bus controllable vertical picture size, picture § Full horizotal plus vertical autosync capability §...
  • Page 61 I²C-bus autosync deflection controller for PC monitors TDA4857 BLOCK DIAGRAM...
  • Page 62 I²C-bus autosync deflection controller for PC monitors TDA4857 PINNING SYMBOL DESCRIPTION HFLB horizontal flyback input XRAY X-ray protection input B+ control OTA output BSENS B+ control comparator input B+ control OTA input BDRV B+ control driver output PGND power ground HDRV horizontal driver output XSEL...
  • Page 63 I²C-bus autosync deflection controller for PC monitors TDA4857 Vertical sync integrator Normalized composite sync signals from HSYNC are inte- grated on an internal capacitor in order to extract vertical sync pulses. The integration time is dependent on the hori- zontal oscillator reference current at HREF (pin 28). The integrator output directly triggers the vertical oscillator.
  • Page 64 I²C-bus autosync deflection controller for PC monitors TDA4857 Frequency-locked loop Horizontal oscillator The frequency-locked loop can lock the horizontal oscilla- The horizontal oscillator is of the relaxation type and re- tor over a wide frequency range. This is achieved by a com- quires a capacitor of 10 nF at HCAP (pin 29).
  • Page 65 I²C-bus autosync deflection controller for PC monitors TDA4857 The formulae for R also takes into account the voltage An external modulation of the PLL2 phase is not allowed, HBUF swing across this resistor: because this would disturb the pre-correction of the hori- zontal focus parabola.
  • Page 66 I²C-bus autosync deflection controller for PC monitors TDA4857 X-ray protection Table 2 Calculation of f total spread fr(V) Contributing elements The X-ray protection input XRAY (pin 2) provides a voltage Minimum frequency offset between f fr(v) detector with a precise threshold. If the input voltage at lowest trigger frequency XRAY exceeds this threshold for a certain time, then con- Spread of IC...
  • Page 67 I²C-bus autosync deflection controller for PC monitors TDA4857 Adjustment of vertical position, vertical linearity and The pincushion (EW parabola) amplitude, corner and tra- vertical linearity balance pezium correction track with the vertical picture size (VSIZE) Register VOFFS provides a DC shift at the sawtooth out- and also with the adjustment for vertical picture position puts VOUT1 and VOUT2 (pin 13 and 12) without affecting (VPOS).
  • Page 68 I²C-bus autosync deflection controller for PC monitors TDA4857 Two different modes of operation can be chosen for the Dynamic focus section [FOCUS (pin 32)] EW output waveform via control bit FHMULT: This section generates a complete drive signal for dynamic 1.
  • Page 69 I²C-bus autosync deflection controller for PC monitors TDA4857 An internal discharge circuit allows a well defined discharge Supply voltage stabilizer, references, start-up of capacitors at BSENS. BDRV is active at a LOW-level procedures and protection functions output voltage (see Fig. 22), thus it requires an external inverting driver stage.
  • Page 70 I²C-bus autosync deflection controller for PC monitors TDA4857 Table 3 Activation of protection mode Power dip recognition ACTIVATION RESET In standby mode the I²C-bus will only answer with an Low supply voltage at pin10 increase supply voltage; acknowledge, when data is sent to control register with reload registers;...
  • Page 71 I²C-bus autosync deflection controller for PC monitors TDA4857 APPLICATION INFORMATION...
  • Page 72: Horizontal Drive And Power Supply Output

    Horizontal drive and power supply output Circuit Diagram Description of the circuit: 1) R1, T1 and Q2 compose the horizontal driving circuit, and the transistor Q1 generates a horizontal output through the driving signal. IB1 = I / Q1h CPMAX feMIN ¡Ü...
  • Page 73: Horizontal Amplitude Control

    Horizontal amplitude control Circuit Diagram +28V H-Width Description of the circuit: 1) The diodes D1 and D2 compose the bipolar modulation circuit, and have the function of controlling the currents of the oils DY(lpp) and Lm(lm) through voltage modulation carried out by utilizing VM. →...
  • Page 74: Blanking And Spot Killer

    Blanking and spot killer Circuit Diagram V-SYNC MUTE V-OUT BRIGHT CONTER Description of the circuit: 1) The vertical blanking circuit completes by Q1, Q2, Q3 and peripheral circuit. The vertical sync pulse applied to R3, R12 connected to Q5 base. Q5 is invert amplifier, then mixer with Q1 base together for compensate vertical retrace time of the blanking pulse.
  • Page 75: Video Amplifier System With On-Screen Display

    Video amplifier system with on-screen display LM1281 (U201) Outstanding features: * Three-channel video amplifier bandwidth 85 MHz @ -3 dB (4 Vp-p output) * OSD TTL input, bandwidth 50 MHz * High-speed video/OSD changeover * High impedance DC contrast control above the 0-4V, 40dB range * High impedance DC OSD contrast control above the 0-4V, 40dB range BLOCK AND CONNECTION DIAGRAM Red OSD Input...
  • Page 76 Test Circuits R21 47k = + 12V RED DRIVE ADJ. POT3 100K GREEN DRIVE ADJ. POT1 0.1 µ F 100 µ F 100K RED OSD INPUT BLUE DRIVE ADJ. POT2 0.1 µ F 100K GREEN OSD INPUT RGB CUTOFF ADJ. 0.1 µ...
  • Page 77: Monolithic Triple 13.5Ns Crt Driver

    Monolithic triple 13.5nS CRT driver...
  • Page 81: On Screen Display

    On Screen Display FEATURES • Horizontal sync input may be up to 100 kHz. • On-chip PLL circuitry up to 90MHz pixel rate for multi-sync operation. • Programmable horizontal resolutions up to 1524 dots per display row. • 538 bytes display registers to control full screen display. •...
  • Page 82 1.0 CONNECTION DIAGRAM (16 PINS PDIP 300 MIL PACKAGE) VSSA ROUT GOUT VDDA BOUT MTV016-N HFLB FBKG HTONE VFLB 2.0 PIN DESCRIPTIONS Name Pin# Function VSSA Analog ground. This ground pin is used to internal analog circuitry. Voltage Control Oscillator. This pin is used to control the internal oscillator frequency by DC voltage input from external low pass filter.
  • Page 83: Replacement Parts List

    Replacement Parts List 1) MultiSync 75F-3 The components specified for Model MS75F-3 Orion CRT. Note: The components identified by make are critical for safety. Replace only with parts Number specified. SYMBOL PART NO DESCRIPTION SYMBO L PART NO DESCRIPTIO N CRT &...
  • Page 84 SYMBOL PART NO DESCRIPTIO N SYMBO L PART NO DESCRIPTIO N R278 R280 R290 FA240223 CARBO N 1/4W (T) 5% 22Kohm R386 FA040623 CARBON 1/8W (T) 5% 62Kohm R30X R116 FA240271 CARBON 1/4W (T) 5% 270ohm R319 FA040683 CARBON 1/8W (T) 5% 68Kohm R30T FA240332 CARBON 1/4W (T) 5% 3.3Kohm...
  • Page 85 SYMBOL PART NO DESCRIPTIO N C277 G B9332H8 CERAMIC Z5V(F)/T 3300P/1KV Z C120 C138 GAI10775 ELECT 105oC/A 100u/100V M TK C214 C234 C254 GA210575 ELECT 105oC/T 1u/100V M C288 GAB22675 ELECT 105oC/T 22u/100V M C428 GA347485 ELECT 85oC/T 0.47u/250V M C122 GA310815 ELECT 85oC/T 1000u/10V M...
  • Page 86 The components specified for Model MS75F-3 Samsung CRT. Note: The components identified by make are critical for safety. Replace only with parts Number specified. SYMBOL PART NO DESCRIPTIO N SYMBO L PART NO DESCRIPTIO N CRT & TUNER TRANSFO RMERS 80013481 CRT17"SAMAUNGM41Q CJ761X172DFX T301...
  • Page 87 SYMBOL PART NO DESCRIPTIO N SYMBO L PART NO DESCRIPTIO N R278 R280 R290 FA240223 CARBO N 1/4W (T) 5% 22Kohm R386 FA040623 CARBON 1/8W (T) 5% 62Kohm R30X R116 FA240271 CARBON 1/4W (T) 5% 270ohm R319 FA040124 CARBO N 1/8W (T) 5% 120Kohm R30T FA240332 CARBON 1/4W (T) 5% 3.3Kohm...
  • Page 88 SYMBOL PART NO DESCRIPTIO N C277 G B9332H8 CERAMIC Z5V(F)/T 3300P/1KV Z C120 C138 GAI10775 ELECT 105oC/A 100u/100V M TK C214 C234 C254 GA210575 ELECT 105oC/T 1u/100V M C288 GAB22675 ELECT 105oC/T 22u/100V M C428 GA347485 ELECT 85oC/T 0.47u/250V M C122 GA310815 ELECT 85oC/T 1000u/10V M...
  • Page 89 The components specified for Model MS75F-3 LG CRT. Note: The components identified by make are critical for safety. Replace only with parts Number specified. SYMBOL PART NO DESCRIPTIO N SYMBOL PART NO DESCRIPTION CRT & TUNER TRANSFORMERS 80013321 CRT 17" LG M41QEE903X03 T301 80009281 17"...
  • Page 90 SYMBOL PART NO DESCRIPTIO N SYMBO L PART NO DESCRIPTIO N R278 R280 R290 FA240223 CARBO N 1/4W (T) 5% 22Kohm R386 FA040623 CARBON 1/8W (T) 5% 62Kohm R30X R116 FA240271 CARBON 1/4W (T) 5% 270ohm R319 FA040683 CARBON 1/8W (T) 5% 68Kohm R30T FA240332 CARBON 1/4W (T) 5% 3.3Kohm...
  • Page 91 SYMBOL PART NO DESCRIPTIO N C277 G B9332H8 CERAMIC Z5V(F)/T 3300P/1KV Z C120 C138 GAI10775 ELECT 105oC/A 100u/100V M TK C214 C234 C254 GA210575 ELECT 105oC/T 1u/100V M C288 GAB22675 ELECT 105oC/T 22u/100V M C428 GA347485 ELECT 85oC/T 0.47u/250V M C122 GA310815 ELECT 85oC/T 1000u/10V M...
  • Page 92 The components specified for Model AS75F-3 ORION CRT. Note: The components identified by make are critical for safety. Replace only with parts Number specified. SYMBOL PART NO DESCRIPTION SYMBOL PART NO DESCRIPTION CRT & TUNER 80013331 CRT 17" ORION M41QEC200XX021 ZD303 ZD701 ZD702...
  • Page 93 SYMBOL PART NO DESCRIPTION SYMBOL PART NO DESCRIPTION R292 FA240101 CARBON 1/4W(T) 5% 100ohm R224 R30V FA040302 CARBON 1/8W(T) 5% 3Kohm R206 R725 FA240103 CARBON 1/4W(T) 5% 10Kohm R119 R129 R148 FA040472 CARBON 1/8W(T) 5% 4.7Kohm R173 R204 R282 R10A R31F FA240113 CARBON 1/4W(T) 5% 11Kohm...
  • Page 94 SYMBOL PART NO DESCRIPTION SYMBOL PART NO DESCRIPTION C275 C278 C287 GB7102F3 CERAMIC Y5P(B)/T 1000P/500V K C307 GFD47482 PLASTIC MPPS/A 0.47u/250V J(MYLAR) C297 C271 C347 C401 GE210252 PLASTIC PEI/T 0.001u/50V J C605 GB710253 CERAMIC Y5P(B)/T 1000P/50V K C40A C413 GE222252 PLASTIC PEI/T 0.0022u/50V J C127 GB7101H3...
  • Page 95 The components specified for Model AS75F-3 SAMSUNG CRT. Note: The components identified by make are critical for safety. Replace only with parts Number specified. SYMBOL PART NO DESCRIPTION SYMBOL PART NO DESCRIPTION CRT & TUNER 80013481 ZD102 EKA01201 ZEN DIODE 1/2W(T) HZS12A2(HITACHI) CRT 17"...
  • Page 96 SYMBOL PART NO DESCRIPTION SYMBOL PART NO DESCRIPTION R292 FA240101 CARBON 1/4W(T) 5% 100ohm R211 R231 R251 FA040330 CARBON 1/8W(T) 5% 33ohm R206 R725 FA240103 CARBON 1/4W(T) 5% 10Kohm R213 R233 R253 FA040391 CARBON 1/8W(T) 5% 390ohm R713 FA040393 CARBON 1/8W(T) 5% 39Kohm R10A R31F FA240113...
  • Page 97 SYMBOL PART NO DESCRIPTION SYMBOL PART NO DESCRIPTION C353 GB633152 CERAMIC SL/T 330P/50V J C355 GFB75482 PLASTIC MPP/A 0.75u/250V J C705 C706 GB633052 CERAMIC SL/T 33P/50V J C332 GFD334E2 PLASTIC MPPS/A 0.33U/400V (PILKOR) SG301 80011281 CERAMIC SPARK CAPS 1KV +1500V~900V C276 C334 C357...
  • Page 98 The components specified for Model AS75F-3 LG CRT. Note: The components identified by make are critical for safety. Replace only with parts Number specified. SYMBOL PART NO DESCRIPTION SYMBOL PART NO DESCRIPTION CRT & TUNER 80013321 CRT 17" LG M41QEE903X04 ZD102 EKA01201 ZEN DIODE 1/2W(T) HZS12A2(HITACHI)
  • Page 99 SYMBOL PART NO DESCRIPTION SYMBOL PART NO DESCRIPTION R292 FA240101 CARBON 1/4W(T) 5% 100ohm R213 R233 R253 FA040391 CARBON 1/8W(T) 5% 390ohm R206 R725 FA240103 CARBON 1/4W(T) 5% 10Kohm R713 FA040393 CARBON 1/8W(T) 5% 39Kohm R224 R30V FA040302 CARBON 1/8W(T) 5% 3Kohm R10A R31F FA240113...
  • Page 100 SYMBOL PART NO DESCRIPTION SYMBOL PART NO DESCRIPTION C353 GB633152 CERAMIC SL/T 330P/50V J C355 GFB75482 PLASTIC MPP/A 0.75u/250V J C705 C706 GB633052 CERAMIC SL/T 33P/50V J C332 GFD304E2 PLASTIC MPPS/A 0.3u/400V J (PILKOR) SG301 80011281 CERAMIC SPARK CAPS 1KV +1500V~900V C307 GFD47482...
  • Page 101: Block Diagrams

    MS75F-3/AS75F-3(N0701-3) HORIZONTAL AND VERTICAL KA3842 SYNC PROCESSOR S M P S TDA4857 EH.T. SYSTEM ARCHITECTURE H/HV EW-OUT & HOUT / V.GEOMETRY MCU/E²ROM/DDC DYNAMIC VERT OUT FOCUSING TDA 8172 RGB OUT WT6232+24C08 LM2438 DC-DC DEFLECT-STAGE CUT-OFF I²C MOTHER BOARD R G B CUT-OFF RGB PREAMP MTV-016...
  • Page 102 MODEL MS75F-3 / AS75F-3 VIDEO BOARD SCHEMATIC DIAGRAM...
  • Page 103 MODEL MS75F-3 MAIN BOARD SCHEMATIC DIAGRAM...
  • Page 104 MODEL AS75F-3 MAIN BOARD SCHEMATIC DIAGRAM...