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Hitachi CPX2102MS 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
SERVIC E M A N UA L
M A N UEL D 'E N TRETIE N
W A RTUN GSH A N D BUCH
Monitor
December 1999
No. 0420
CPX2102MS
NAMES»
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
de modifications en vue de perfectionner
le produit.
Die in diesem Wartungshandbuch
enthaltenen Spezifikationen können sich
zwecks Verbesserungen ändern.
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  • Page 1 No. 0420 CPX2102MS NAMES» SERVIC E M A N UA L M A N UEL D 'E N TRETIE N W A RTUN GSH A N D BUCH CAUTION: Before servicing this chassis, it is important that the service technician read the “Safety Precautions”...

  • Page 2: Table Of Contents

    SERVICE MANUAL 21 "F " CHASSIS CONTENTS 1. Precautions 7. Technical Study(SMPS Operation) --------------------------------- 3 -- 29 1-1. Safety Precautions --------------------- 3 7-1. VIN terminal(pin 4) : Start-up circuit ---------------------------- 29 1-2. Servicing Precautions ----------------- 5 7-2. OCP/F.B. terminal(pin 1) 1-3.

  • Page 3: Precautions

    1. Precautions Follow these safety, servicing and ESD precautions to prevent damage and protect against potential hazards, such as electrical shock and X-rays. 1-1. Safety Precautions 1. Be sure that all of the built-in protective devices are replaced. Restore any missing protective shields. 2.
  • Page 4 5. With the unit completely reassembled, plug the AC line cord directly to the power outlet. With the unit s AC switch first in the ON position and then OFF, measure the current between a known earth ground (metal water pipe, conduit, etc.) and all exposed metal parts, including handle brackets, metal cabinets, screwheads and control shafts.

  • Page 5: Servicing Precautions

    14. Product Safety Notice Some electrical and mechanical parts have special safety-related characteristics which might not be obvious from visual inspection. These safety features and the protection they give might be lost if the replacement component differs from the original-even if the replacement is rated for higher voltage, wattage, etc.

  • Page 6: Precautions For Electrostatically Sensitive Devices(Esds)

    8. Always connect a test instrument s ground lead to the instrument chassis ground before connecting the positive lead always remove the instrument s ground lead list. 1-3. Precautions for Electrostatically Sensitive Devices (ESDs) 1. Some semiconductor ("solid state") devices are easily damaged by static electricity. Such some components are called Electrostatically Sensitive Devices (ESDs) examples include integrated circuits and some field-effect transistors.

  • Page 7: Specifications

    2. Specifications MODEL : CT21AF DESCRIPTION : 21 INCH CCTV WITH 2 CH CAMERA INPUT & HORIZONTAL RESOLUTION 450 LINES 1) SPECIFICATIONS COLOR SYSTEM : NTSC 3.58 / PAL-B POWER INPUT : AC 100-240V(50/60 Hz) POWER CONSUMPTION : 67W VIDEO IMPEDANCE : 75Ohm BNC SOUND OUTPUT : 1.0 0.2W 8 Ohm...
  • Page 8 4) LIGHTINGS INDICATOR : POWER ON (GREEN) : VIDEO 1 (GREEN) : VIDEO 2 (GREEN) : Y / C (GREEN) 5) JACK & TERMINALS 4 BNC : VIDEO INPUT/OUTPUT 4 AUDIO RCA : AUDIO INPUT/OUTPUT S-VHS MINI DIN : S-VHS INPUT AC INLET : AC INPUT 6) ACCESSORIES...

  • Page 9: Description Of Controls

    3. Description of controls Front View Side View 1. TINT 2. SHARPNESS 3. COLOR Rear View 4. BRIGHTNESS 5. CONTRAST 6. VOLUME 7. VIDEO 1 8. VIDEO 1 LED LAMP 9. VIDEO 2 10. VIDEO 2 LED LAMP 11. Y/C 12.
  • Page 11 ITEM Q’TY FRONT PANEL ASS’Y SPEAKER SYSTEM SCREW BTB 3 10 KNOB, BLOCK KNOB, POWER BRACKET, POWER SCREW PB 3 0.5 6 SCREW BTB 3 10 POWER S/W, MTR CONTROL, MONITOR SCREW BTB 3 10 CPT ASS’Y BRACKET, LEFT BRACKET, RIGHT SCREW HTTBW 6 30 KNOB, VOLUME ASS’Y BOTTOM COVER...

  • Page 12: Alignment And Adjustments

    5. Alignment and Adjustments 5-1. Preadjustment 5-1-1. Factory Mode 1. Do not attempt these adjustments in the VIDEO mode. 2. The Factory Mode adjustments are necessary when either the EEPROM(Q002) or the CPT is replaced. 3. Do not tamper with the "Adjustment" screen of the Factory Mode menu. The screen is intended only for factory use.
  • Page 13 5-2-2. Service Adjustment Parameter Main Adjustment Parameter FUNCTION RANGE INITIAL DATA ABBREVIATION SCREEN VOLTAGE Screen ADJ INCH OPTION Inch 21 inch HORIZONTAL SHIFT 0 ~ 63 Step VERTICAL AMPLITUDE Height 0 ~ 63 Step VERTICAL SHIFT 0 ~ 63 Step VERTICAL SLOPE 0 ~ 63 Step RED CUTOFF...
  • Page 14 FORF 0,0 : Auto 60Hz, 0,1 : 60Hz forced Forced field frequency 1,0 : Keep last detected freq., 1,1 : Auto 50Hz FORS Off : Normal Vertical divider mode NCIN On : Switched to large search window Off : Switch-off undefined Vertical overscan On : Switch-off in vertical overscan Off : Vertical scan active...
  • Page 15 Off : Disabled Enable ext. comb filter On : Enabled Off : Active Bypass chroma delay line On : Bypassed Off : Adapted to standard Matrix selection On : Forced to PAL matrix 0 0 0 : Automatic 0 0 1 : Forced X-tal pin 34 PAL/NTSC 0 1 0 : Forced X-tal pin 34 PAL 0 1 1 : Forced X-tal pin 34 NTSC Color decoder mode...

  • Page 16: Other Adjustments

    5-2-4. Outcondition The Outcondition Mode is used during factory inspection. Function Reset 1. System Auto 5-3. Other Adjustments 5-3-1. General Alignment Instructions 1. Usually, a color CCTV needs only slight touch-up adjustment upon installation. Check the basic characteristics such as height, horizontal and vertical sync and focus. 2.
  • Page 17 5-3-3. High Voltage Check CAUTION There is no high voltage adjustment chassis. The B + power supply should be + 135 volts (see table 1). 1. Connect a digital voltmeter to the second anode of the picture tube. 2. Turn on the CCTV SET. Set the Brightness and Contrast controls to minimum. 3.
  • Page 18 9. Slowly move the deflection yoke forward. Adjust for the best overall green screen. 10. Temporarily tighten the deflection yoke. 11. Produce blue and red rasters by adjusting the-low-light controls. Check for good purity in each field. 12. Tighten the deflection yoke. 5-3-7.
  • Page 19 Vertical Green Belt ADJUST FIG. B-2 CENTER CONVERGENCE ADJUSTMENT BLUE BLUE BLUE BLUE/RED GREEN 4-POLE MAGINETS MOVEMENT 6-POLE MAGINETS MOVEMENT FIG. B-3 CENTER CONVERGENCE ADJUSTMENT 5-3-8. White Balance Adjustment NOTE The purpose of this procedure is to optimize the picture tube to obtain good black and white picture at all brightness levels while at the same time achieving maximum usable brightness.

  • Page 20: Using Devices And Description

    6. Using Devices and Description. 6-1. Main Signal Processor (TDA8842) 6-1-1. Feature The following feature are available in all IC’S : Multi-standard vision IF circuit with PLL demodulator Alignment-free multi-standard FM sound demodulator (4.5MHz to 6.5MHz) Flexible source selection with CVBS switch and Y(CVBS)/C input so that a comb filter can be applied.
  • Page 21 6-1-2. Pinning and Description DESCRIPTION DESCRIPTION Sound IF input (B-Y) signal output External audio input (R-Y) signal output IF VCO tuned circuit 1 (B-Y) signal input IF VCO tuned circuit 2 (R-Y) signal input IF-PLL loop filter Subcarrier reference output IF video output 3.58MHz X-tal Serial clock input...
  • Page 22 6-1-3. Block Diagram I2C-bus controlled NTSC/PAL CCTV Processors TDA884X/5X-N1 series...
  • Page 23 6-1-4. Function Description 1. Audio Alignment free multi standard PLL audio demodulator (4.5 to 6.5 MHz) Volume control 2. Video Integrated fixed luminance delay line Integrated chroma trap (auto calibrated) Integrated chroma bandpass filters with switchable center frequency (auto calibrated) Asymmetrical peaking circuit in the luminance channel with switchable noise coring function Black stretching of non standard CVBS or luminance signals, switchable via IIC-bus...

  • Page 24: Vertical Output(Tda8351)

    6-2. Vertical Output (TDA8351) 6-2-1. Feature Highly efficient fully DC-coupled vertical output bridge circuit Vertical flyback switch Protection against: Short-circuit of the output pins (7 and 4) Short-circuit of the output pins to Vp Temperature (thermal) protection High EMC immunity because of common mode inputs 6-2-2.

  • Page 25: Video Output Amplifier (Tda6101Q)

    6-3. Video Output Amplifier (TDA6101Q) 6-3-1. Feature Bandwidth 9MHz typical at 100Vp-p Slewrate 1700 V/us Only one supply voltage Protection against ESD Black-current measurement output for automatic black current stabilization Internal reference voltage Thermal protection Defined switch-off behaviour 6-3-2. Pinning and Description DESCRIPTION Non-inverting voltage input Supply voltage low...

  • Page 26: Audio Output Amplifier(Ka2201)

    6-4. Audio Output Amplifier (KA2201) 6-4-1. Feature Wide operating supply voltage : Vcc=3V~14V. Medium output power. Low quiescent circuit current. Good ripple rejection Minimum number of external parts required. 6-4-2. Pinning and Description Pin Description Description INPUT OUTPUT BOOTSTRAP RIPPLE...

  • Page 27: Power(Str-F6656)

    6-5. Power (STR-F6656) 6-5-1. Feature Small SIP full mold package Guaranteed avalanche energy : Makes it possible to simplify surge absorbing circuit Many protection functions : Pulse-by-pulse overcurrent protection Overvoltage protection with latch mode Thermal protection with latch mode 6-5-2. Pinning and Description DESCRIPTION DESCRIPTION Input of overcurrent detection signal...

  • Page 28: Video Select Switch(Cd4053Be)

    6-6. Video Select switch (CD4053BE) 6-6-1. Feature SIP-16 Pin Triple 2-Channel Wide range of digital and analog signal levels digital 3 to 20V, analog to 20V Low ON resistance : 125 Ω (typ.) 6-6-2. Pinning and Description DESCRIPTION DESCRIPTION Y1 Input Z Switch Y0 Input Y Switch...

  • Page 29: Technical Study(Smps Operation)

    7. Technical Study (SMPS Operation) 7-1. V terminal(pin 4) : Start-up circuit The start-up circuit starts and stops the operation of the control IC by detecting the voltage appearing at the V terminal (pin 4). The power supply (V terminal input) of the control IC uses a circuit as shown in Fig.
  • Page 30 After the control circuit starts its operation, power is supplied by smoothing and rectifying the voltage of the drive winding D which is provided in the transformer. An example of the waveform of the V terminal voltage is shown in Fig. 3. The drive winding voltage does not increase to the set voltage immediately after the control circuit starts its operation.

  • Page 31: Ocp/F.b. Terminal(Pin 1) : Oscillator And Constant Voltage Control Circuit

    7-2. OCP/F.B. terminal (pin 1) : Oscillator and constant voltage control circuit. The Oscillator makes use of charging and discharging of C1 incorporated in the hybrid IC and generates pulse signals to determine the OFF-time of the MOS FET. The constant voltage control of a switch mode power supply is performed by fixing the OFF-time of the MOS FET (=50 sec.) and changing the ON-time in the PRC(Pulse Ratio Control) operation.
  • Page 32 Fig. 7 Oscillating operation at constant voltage control For the control of the output, the feedback current (FB current) flowing to a photocoupler flows across R4 and voltage drop VR4 thus caused is added to VR5. The VR5 voltage (peak value of ID) which is necessary for the inversion of the Comp.1 is controlled by VR4 (FB current) to change the height of ID peak value and VR4 controls the secondary side output (current mode control).

  • Page 33: Ocp/F.b. Terminal(Pin 1) Ocp Circuit

    7-3. OCP/F.B terminal (pin 1) OCP circuit This is a pulse-by-pulse overcurrent protection circuit which detects the peak of the peak of the drain current of the MOS FET in every pulse and reverses the oscillator output. Fig. 7 shows the overcurrent detection circuit. The MOS FET drain current is detected by inputting the voltage drop of R5 connected between the source Fig.

  • Page 34: Drive Circuit

    7-4. Drive circuit This circuit charges and discharges the capacitance between the gate and the source of the power MOS FET by receiving pulses from the oscillator. As shown in Fig.10, the basic circuit configuration is totem-pole type connection of transistors and the maximum source current is 0.2A and the maximum sink current is 0.3A.

  • Page 35: Thermal Shutdown Circuit

    7-6. Thermal shutdown circuit This circuit triggers the latch circuit when the frame temperature of the hybrid IC exceeds 140 (typ). The temperature is actually sensed by the control IC, but it also works against overheating of the MOS FET as the MOS FET and the control IC are mounted on the same lead frame. 7-7.

  • Page 36: Trouble Shooting

    8. Trouble Shooting 8-1. No Power 1) Check F801 Check the voltage IF F801 is broken, replace it after checking this : between + and - of C805 D801, D802, D803, D804 2) Check Q801 Check Q805, D825, T801 Check the pin 3 of Q805 Check Q001 Pin 34 Check the pin 1, 3 Check Q807, D825...

  • Page 37: No Raster

    8-2. No Raster Heater Voltage is OK but No Raster. Increase screen voltage by turn right screen volume Check the Appear Raster Check T461 voltage between (with Vertical D281 + and - C281 retrace line) Check Readjust screen Q901, Q902, Q903 voltage Check the voltage Check Q501...

  • Page 38: No Sound

    8-3. No Sound(Picture OK) Do the volume control in max before check this routine. QS02 Check Check the signal waveform to the pin 2 of Q501 PV05 Check Check the signal waveform Check Q501 to the pin 15 of Q501 Check Q604 Q603 Q601...
  • Page 42 R235 H11A817C CCTV SCHEMATIC DIAGRAM **NOTES** CAUTION : MODEL NO. CPX2102MS SINES THESE PARTS MARKED BY ARE CRITICAL FOR SAFETY USE ONES 1.The unit of all resistors is the "OHM" unless otherwise listed. DESCRIBED ON PARTS LIST ONLY K=1,000 M=1,000,000 1/2S:SOLID 1/2W CHASSIS NO.

  • Page 43: Parts List

    THE UPDATED PARTS LIST FOR THIS MODEL IS AVAILABLE ON ESTA...
  • Page 44 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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