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Hitachi CM621FET Service Manual

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CAUTION:
Before servicing this chassis, it is important that the service technician read the "Safety
Precautions" and "Product Safety Notices" in this service manual.
ATTENTION:
Avant d'effectuer l'entretien du châassis, le technicien doit lire les «Précautions de sécurité»
et les «Notices de sécurité du produit» présentés dans le présent manuel.
VORSICHT:
Vor Öffnen des Gehäuses hat der Service-Ingenieur die „Sicherheitshinweise" und „Hinweise
zur Produktsicherheit" in diesem Wartungshandbuch zu lesen.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
Colour Monitor
June 2001
No. 0419
CM621FET
Data
contained
within
this
manual is subject to alteration for
improvement.
Les données fournies dans le présent
manuel d'entretien peuvent faire l'objet
de modifications en vue de perfectionner
le produit.
Die
in
diesem
Wartungshandbuch
enthaltenen Spezifikationen können sich
zwecks Verbesserungen ändern.
Service

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  • Page 1 No. 0419 CM621FET SERVICE MANUAL MANUEL D'ENTRETIEN WARTUNGSHANDBUCH CAUTION: Before servicing this chassis, it is important that the service technician read the “Safety Precautions” and “Product Safety Notices” in this service manual. Data contained within this Service manual is subject to alteration for improvement.

  • Page 2: Table Of Contents

    1. DISPLAY ALIGNMENT...............1 A. Times & Display Size....................1 B. Picture Position......................1 C. Linearity........................1 D. Alignment Procedure....................2 E. Geometry Distortion ..................... 2 F. Tilt..........................2 G. White Balance Alignment .................... 3 H. Preset Timing........................ 4 2. CONTROL AND CONNECT LAYOUT ........5 A.
  • Page 3 6.VIDEO AMP. CIRCUIT..............16 A. Video PRE. AMP......................16 B. Video Amplifier......................16 7. TROUBLESHOOTING ..............19 A. Power Supply Check ....................19 B. Monitor Check Flow Chart................... 20 APPENDIX A: SCHEMATIC DIAGRAMS ........23 APPENDIX B: DISPLAY UNIT ASSEMBLY DIAGRAMS .....27 APPENDIX C: PART LISTS ............29...
  • Page 4 WARNING 1) This product contains components which are critical for X-radiation safety. Read the Service manual carefully for proper replacement. Maximum 2nd anode voltage use high impedance meter, connect (-) to chassis, use a high voltage lead from (+) to 2nd anode. 2) Critical Components are marked with the symbol of in the material list.

  • Page 5: Display Alignment

    1. DISPLAY ALIGNMENT A. TIMING & DISPLAY SIZE For all presetting mode shall be within the limitation: H. WIDTH 300 ± 5mm V. HEIGHT 225 ± 3 mm The external control range of the data area, shall be as follows; Max.

  • Page 6: Alignment Procedure

    D. ALIGNMENT PROCEDURE • Warm up the monitor for at least 30 minutes before adjustment. • Set the front of CRT to the east. • Turn all VR set to center position. D-1. Use front control key adjust the display size about 300mm, adjust VR801 Let the High voltage of Circuit is 26KV in Timing 68K mode CROSS PATTERN.

  • Page 7: White Balance Alignment

    G. WHITE BALANCE ALIGNMENT G.1.1 Select timing #6 (VESA 68K 1024X768) with crosshatch pattern, adjust both horizontal and vertical OSD’s size control to get display size within 300x225p±2mm. G.1.2 Disconnect RGB signal inputs, adjust OSD’s brightness and G1 control to it’s maximum position.

  • Page 8: Preset Timing

    H. PRESET TIMING: PRESET MODE TIMING MODE H Pixes Fd(MHz) Fh(KHz) Th(us) Td(us) Tb(us) Tp(us) Tf(us) V Lines Polar(H/V) Fv(Hz) Tv(ms) Td(ms) Tb(ms) Tp(ms) Tf(ms) d:dot B.G: A.F: D.I: C.H: d:display backporch Pulse front 25.175 31.47 31.778 25.422 1.907 3.813 0.636 59.94 16.683...

  • Page 9: Control And Connect Layout

    2. CONTROL AND CONNECT LAYOUT A. Main PCB...

  • Page 10: Video Pcb

    B. Video PCB...

  • Page 11: Pin Assignment

    C. PIN ASSIGNMENT C-1. Connect Table P102 P105-P303 P104-P302 DETECT V-OUT DDC-SCL OSE-SDA DDC-SDA OSD-SCL H-out HEATER V-sync H-sync 100V p1 -> p101 for switch board. C-2. Connect Function P803 : H-CENTER CONN P501 : TILT CONN P802 : CANCEL COIL CONN P103: PRESET CONN P902 :...

  • Page 12: Introduction

    3. INTRODUCTION: MF700 is a 17” multisync color monitor. The horizontal frequency range is from 30khz to 70khz, and the refresh rate is from 50hz to 160hz. The circuit includes four major parts, the power supply circuit, the deflection circuit, the video circuit and the digital control circuit. is the function block diagram.

  • Page 15: Power Supply

    4. POWER SUPPLY A. RECTIFIER AND FILTER CIRCUIT: The 90Vac-265Vac input line voltage is rectified by D901- D904, and smoothed by C906 to provide DC operating voltage for the circuit. B. FLYBACK AND PWM CIRCUIT : When power is initially applied to the circuit, C909 charges through R903, Q902.When the voltage across C909 reaches a level of 16V, U901 is enabled, turning on Q903 and turning off Q902 to complete start-up action.

  • Page 16: Degauss Circuit

    F. DEGAUSS CIRCUIT: The DEGU signal which comes from micro-p to control degauss coil act or not. When DEGU is high, Q950 will be saturated to make RL901 working, AC line provides a degaussing current to degauss coil. G. OVERLOAD PROTECTION CIRCUIT: The primary current flows through the current sensing resistor R907.

  • Page 17: Deflection

    5. DEFLECTION A. SYNC PROCESSOR: H-sync & V-sync input to U1 (uP), then up output the H-out, V-out signal to U401 TDA9113. The H-out, V-out always are positive. B. HORIZONTAL PROCESSOR Fig 3 is the block diagram of IC TDA9113. The IC TDA9113 output vertical sawtooth and H-Drive signal to produce, H.V deflection.
  • Page 19 Fig4...

  • Page 20: Video Amp. Circuit

    6. VIDEO AMP. CIRCUIT A. VIDEO PRE-AMPLIFIER The video pre-amp IC is U201 (TDA9210). The input signal is 0.7Vpp, then pre-amp IC U201 amplify the video signal to 4~5Vpp. The U201 is controlled by up via I C bus is the block diagram.
  • Page 21 Fig5...
  • Page 22 Fig6...

  • Page 23: Troubleshooting

    7. TROUBLESHOOTING A. POWER SUPPLY CHECK...

  • Page 24: Monitor Check Flow Chart

    B. MONITOR CHECK FLOW CHART B-1. No Raster...
  • Page 25 B-2. No Picture...
  • Page 26 B-3. No Vertical Deflection ( rester become a horizontal line)

  • Page 27: Appendix A: Schematic Diagrams

    R501 R537 R504 T501 H.V. +12V +15VS Q517 C502 R538 R502 R503 Q501 R811 R812 C501 0.47U R505 P801 R542 100U 2SC5521 H-DY 1/2W SMOD Q808 R506 R543 R531 C503 P802 D811 0.01U C805 1/2W R810 1N4148 1000P C504 D502 L806 Q502 R823...
  • Page 28 < 33K 33~35K 36~40K 41~51K 52~57K 58~65K < 70K 34K< 34~40K 40~45K 45~51K 51~58K 58~61K 62~75K >75K SW 1 SW 1 SW 2 SW 2 SW 3 SW 3 SW 4 SW 4 FOR 70K TABLE FOR 87K TABLE P103 & (+) & (-) =>POWER CORD ON ==INI 1N4148 78R05 100U...
  • Page 29 C960 R963 C963 JP903 10mm 472Y1 GND5 GND1 1/2W R902 Q962 L941 T901 D943 B649 R927 UF4006G C906 ERL39 R904 C907 220U +90V R903 0.01U 400V 1/2W 1N5406 x 4 C947 R954 R965 #_450V R928 200VB R966 Q961 1/2W 1/4W 1/2W D913 D905...
  • Page 30 P302 L232 C304 R304 BEAD 0.01U +12V D307 1/2W +100V <FBT> L304 FR10-04 C301 C302 BEAD HEATER L231 C238 L311 C303 D308 0.01U BEAD C308 0.022U 160V 500V BEAD 1000P FR10-04 SPG1 0.01U SOCK1 R247 R245 D234 4.7K R246 SPG4 1N4148 1/4W D237...

  • Page 31: Appendix B: Display Unit Assembly Diagrams

    VA-719/VQ-709 TIE ON ITEM...

  • Page 33: Appendix C: Part Lists

    THE UPDATED PARTS LIST FOR THIS MODEL IS AVAILABLE ON ESTA...
  • Page 34 Fax: +49- 89-991 80-224 Email: atencion.cliente@hitachi-eu.com Hotline: +49-180-551 25 51 (12ct/min) Email: HSE- DUS.service@hitachi-eu.com HITACHI EUROPE srl HITACHI HOME ELECTRONICS (NORDIC) AB Via Tommaso Gulli N.39, 20147 Box 77 S-164 94 Kista Milano, Italia SWEDEN Tel: +46 (0) 8 562 711 00...

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