Hitachi CM715ET Service Manual
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Hitachi CM715ET Service Manual

Hitachi CM715ET 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.
SERVICE MANUAL
MANUEL D'ENTRETIEN
WARTUNGSHANDBUCH
October 2000
No. 0501
CM715ET
Data contained within this Service
manual is subject to alteration for
improvement.
Les données fournies dans le
présent
manuel
d'entretien
peuvent
faire
l'objet
modifications
en
perfectionner le produit.
Die in diesem Wartungshandbuch
enthaltenen
Spezifikationen
können
sich
Verbesserungen ändern.
de
vue
de
zwecks
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  • Page 1 No. 0501 CM715ET SERVICE MANUAL MANUEL D’ENTRETIEN WARTUNGSHANDBUCH CAUTION: Before servicing this chassis, it is important that the service technician read Data contained within this Service the “Safety Precautions” and “Product Safety Notices” in this service manual. manual is subject to alteration for improvement.
  • Page 2 ALL PRODUCTS CE MARK Before any service is performed on the chassis an 1. HITACHI products may contain the CE mark on isolation transformer should be inserted between the the rating plate indicating that the product power line and the product.
  • Page 3 POUR TOUS LES PRODUITS LABEL CE Avant d’effectuer une intervention d’entretien sur le 1. Les produits HITACHI peuvent avoir reçu le label châssis, vous devez insérer un transformateur d’isolement CE qui figure sur la plaque signalétique pour indiquer entre la ligne d’alimentation électrique et le produit.
  • Page 4 Hochspannung sollte immer auf den festgelegten Der Gebrauch von Ersatzteilen, die nicht dieselben Wert des Gehäuses beschränkt bleiben und nicht Sicherheitsmerkmale haben wie die empfohlenen mehr. Betrieb bei höherer Spannung kann zum HITACHI Ersatzteile, wie sie in der Ersatzteilliste Versagen Bildröhre oder hoher aufgeführt sind, kann zu elektrischem Schlag, Feuer,...

  • Page 5: Table Of Contents

    1. DISPLAY ALIGNMENT..............7 A. Time & Display Size ......................7 B. Picture Position......................7 C. Linearity .........................7 D. Geometry Distoriton (All Preset Modes) ..............8 E. Alignment Procedure .....................8 F. White balance alignment ....................9 G. Focus Adjustment ......................10 H. Convergence Adjustment ....................10 I.
  • Page 6 6. PARTS LISTINGS................30 CRT Board VQ-903.....................30 Switch Board VR-903..................34 Deflection & Power Board VA-903................35 7.SCHEMATIC DIAGRAMS..............50 CRT Board......................50 Deflection, Power & Switch Board 1..............51 Deflection, Power & Switch Board 2..............52 Deflection, Power & Switch Board 3..............53 Deflection, Power & Switch Board 4..............54...

  • Page 7: Display Alignment

    1. DISPLAY ALIGNMENT A. Times & Display Size For all presetting mode listing in section 2.4 shall be within the limitation: H. WIDTH 306 ± 4 mm V. HEIGHT 230 ± 4 mm The external control range of the data area, shall be as follows; Max.

  • Page 8: Geometry Distoriton (All Preset Modes)

    D. Geometry Distortion (All Preset Mode) : 1) The Contrast and Brightness control shall be properly adjusted at 20 F-L with full intensity reverse pattern, then change to crosshatch pattern. 2) Pincushion distortion shall be less than H : 1.5% and V : 1.5%. 3) Barrel distortion shall be less than H : 1.5% and V : 1.5%.

  • Page 9: White Balance Alignment

    E-2. Light output adjust Select Timing 1, preset BRI. And CONT. to max. position. Adjust G2 to get G2 = 550V ± 10V Adjust VR803 to get light output = 0.6FL ~ 0.5FL Select Timing 2, adjust VR405 to get pattern over scan. (H SIZE 100%) F.

  • Page 10: Convergence Adjustment

    H. Convergence Adjustment Input R+B and R+G signals, make sure convergence within specified (if not 4 pole and 6 pole). A zone = 0.3MM., B zone 0.4MM. (X) < 0.4MM, (Y) < 0.4MM. NOTE : 1 A area = 230mm (circle) 2 B area = 306 x 230 mm I.

  • Page 11: Power Adjustment

    J. Power Adjustment J-1. Adjust the VR980, have the +15Vs be 15.3v ± 0.1v (the voltage of the C944) in timing 1. ± J-2. Check below items the voltage of C949 : 179 ± ± ± ± C947 : 75 C946 : 44 ±...
  • Page 12 J-6. Preset Timing Adjustment 1. Input each PRESET MODE timing, and use front control key to adjust the display to the normal position and size, and wait for 5 seconds. 2. Switch to next timing, repeat process 1 until every PRESET MODE timing has been adjusted. J-7.
  • Page 13 PRESETTING MODES TABLE 2 B:backporc D:display P:pulse F:front 25.175 31.469 31.778 25.422 3.813 70.087 14.268 11.122 1.875 0.064 1.207 25.175 31.469 31.778 25.422 59.940 16.683 15.253 1.0169 0.064 0.318 31.5 37.5 26.667 20.317 3.81 2.032 0.508 VESA 13.333 12.8 0.427 0.08 0.027 43.269...
  • Page 14 Fig. 2 Fig. 3...

  • Page 15: Main Pcb

    2. CONTROL AND CONNECT LAYOUT Main PCB...

  • Page 17: Pin Assignment

    C. Pin Assignment C-1. Connect Function VR501 : H-CENTER VR P701 : TILT CONN P8 : CANCEL COIL CONN JP1: PRESET CONN P902 : DEGAUSSING COIL CONN P703 : X-RAY TEST PAD P302 P303 P301 HFLB Vout DSUB9 DDC-SCL EEP-SCL R-IN DDC-SDA EEP-SCL...

  • Page 18: Power Supply Portion

    3. Power Supply Portion 8.4V...

  • Page 19: Operation Theory

    4. OPERATION THEORY A. Power Supply: Transfer AC source to DC source that supply all the circuit power. It includes: (1) +12V: For video pre-amp circuit, parts of horizontal and vertical deflection circuit. (2) +180V: For deflection and H.V circuit (3) +7.5V: For CRT heater and u-P power.

  • Page 21: Power Supply

    F. Power Supply F-1. Rectifier And Filter Ckt The 90Vac-265Vac input line voltage is rectified by D901- D904, and smoothed by C906 to provide DC operating voltage for the circuit. F-2. Flyback And PWM Ckt 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 Q901 and turning off Q902 to complete start-up action.

  • Page 22: Deflection

    F-6. Degauss Ckt 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. F-7. OVERLOAD PROTECTION CKT The primary current flows through the current sensing resistor R914.
  • Page 23 G-3. Vertical Output IC U601 (TDA 4866) is the vertical amp IC, the output pin 6 connects to the YOKE. The sawtooth current flows across the YOKE to make vertical deflection. Fig.3 is the block diagram of IC TDA4866 G-4. Horizontal Driver Circuit The driver pulse that comes from U401 pin 7 drives Q417, Q416, to Q503, then transfomer T501 converts driver pulse to driver current to drive horizontal output transistor Q504.

  • Page 24: Flyback Transformer

    H. Flyback Transformer In the primary of FBT, there is about 900Vpp in the LC resonant interval, It convert to the secondary of FBT to produce about 26KV for CRT anode voltage. The other bias for CRT IS G4. G3(4~8KV), G2(0~1000V) and G1(-160V)
  • Page 25 H-1. . BLOCK DIAGRAM...

  • Page 26: Video Amp Circuit

    I. VIDEO AMP. CIRCUIT I-1. VIDEO PRE. AMP. The video pre-amp IC is U301 (KA2143B). The input signal is 0.7Vpp, then pre-amp IC U301 amplify the video signal to 4~5Vpp. The WHITE BALANCE and CONTRAST shall be adjusted by adjustment the bias voltage of U301.
  • Page 27 LM2439 Simplified Schematic Diagram (One Channel)

  • Page 28: Troubleshooting

    5. TROUBLESHOOTING A. Power Supply Check Start Check and replace EMI Filter Check and Q901, I/P Rectifer fuse open and filter Check and replace Q902, Q901 VDS Q903, U901, D908, R908 waveform normally? Is 8V Check D940, C940, Q940, in spec? Q941, VR901 Is 15V Check D941, C944, Q942, Q943...

  • Page 29: Monitor Check Flow Chart

    B. Monitor Check Flow Chart B-1. No Raster No raster Check Check power Check AC power supply indecator lighted power input circuit Check contrast & brightness Check U401 control adjust to MAX. Check Check U401 Check Q504 HEATER voltage= 6.3 VDC pin7 output collector voltage sequare wave from...
  • Page 30 THE UPDATED PARTS LIST FOR THIS MODEL IS AVAILABLE ON ESTA...
  • Page 31 R251 P302 1/2W D252 L251 C252 L252 L310 BEAD 470P C253 6.3V BEAD BEAD .01U L302 R315 C348 BEAD 1/4W R310 C315 H-BLK C314 L312 470U BEAD 0.01U C320 C254 D251 VCC2 C321 L301 300V 1000P FR104 BLK IN 100UH 100V R330...
  • Page 32 31K-33K 33.1K-36K 36.1K-40K 40.1K-52K 52.1K-58K 58K-66K 66K-76K 76K-89K 89K- POWER ON/OFF 7805 KEY-IN 7.5V LED1 220U 2200U 1.3K 5.1K .01U FUN+ .01U LED2 4.7K 7812 16VS 2.7K FUN- 220U 10KX8 3.6K ADJ+ R17 8.2K H-SIZE R68 10K H-PHASE ADJ- R69 10K V-SIZE 5.6K 1N4148...
  • Page 33 D491 R491 FR104 C491 1/4W ZD491 470U (FUSE) HZ12C1 H-SIZE U403 B-DRIVE R471 LM358 H-DRIVE D494 18.2K R449 R494 1N4148 D404 47 1/4W 15VS FORM U401 1N4148 C437 R480 1/4W R489 (FUSE) PIN 26 100U 1/4W 1/4W R464 R451 C446 R468 Q420 C427...
  • Page 34 C506 180P D503 R515 HER102 D507 R503 R504 R542 Q504 T802 Q522 BYD73A 2SC5440 T501 VR501 C562 2SD667 1/4W 220U (FUSE) C502 C542 C555 R512 L504 R862 C501 C531 R508 .22U 2200P C507 P802 R501 3300P BEAD P501 C561 4700P Q501 R514 1/4W...
  • Page 35 101 C950 C961 L902 RT901 R982 D945 D946 L947 1N5406 T902 202V D902 R943 ER306 ER306 C987 R904 SCK055 1N5406 R927 C907 .01U C949 C974 C906 1/2WS C973 D901 500V 100U C952 C971 330U R903 500V 250V 250V 1N5406 R981 R980 GND1 400VA...
  • Page 36 Fax: +46 (0) 8 562 711 13 Tel: +39 02 38073415 Servizio Clienti Email: [email protected] Fax: +39 02 48786381/2 Email: [email protected] HITACHI EUROPE S.A.S HITACHI EUROPE LTD (Norway) AB Lyon Office STRANDVEIEN 18 B.P. 45, 69671 BRON CEDEX 1366 Lysaker FRANCE...

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