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Hitachi 27GX01B-501 Service Manual

Solid state color television
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SERVICE MANUAL

CAUTION:
Before servicing this chassis, it is important that the service technician read the "Safety
Precaution" and "Product Safety Notices" in this Service Manual.
SAFETY PRECAUTIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2
PRODUCT SAFETY NOTICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
POWER SOURCE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
SERVICE NOTES . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
SPECIFICATIONS . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
OPERATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
SERVICE . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
CIRCUITS AND BLOCK DIAGRAMS . . . . . . . . . . . . . . . . . . . . . . . . . . 32
PARTS IDENTIFICATION . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 36
PARTS LIST . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 39
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT
SOLID STATE COLOR TELEVISION
JUNE 2000
This television will display television Closed
Captioning (
or
CC
with paragraph 15.119 of the FCC rules.
CONTENTS
PA
No. 0138
27GX01B-501
27GX01B-511
R/C:
CLU-351U
) in accordance
HHEA-MANUFACTURING DIVISION

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  Summary of Contents for Hitachi 27GX01B-501

  • Page 1: Table Of Contents

    No. 0138 27GX01B-501 SERVICE MANUAL 27GX01B-511 R/C: CLU-351U CAUTION: Before servicing this chassis, it is important that the service technician read the “Safety Precaution” and “Product Safety Notices” in this Service Manual. This television will display television Closed Captioning ( ) in accordance with paragraph 15.119 of the FCC rules.
  • Page 2: Safety Precautions

    SAFETY PRECAUTIONS Leakage Current Hot Check NOTICE: Comply with all cautions and safety-related notes located on or inside the cabinet and on the chasis or Plug the AC cord directly into a 120V AC 60Hz outlet (do picture tube. not use an isolated transformer for this check). Turn the AC power ON.
  • Page 3 Important Safety Notice ....2 Service Adjustments (Electronic Control)....28 Safety Precautions .
  • Page 4: Product Safety Notice

    HITACHI Service Manual. [A subscription to, or additional copies of HITACHI Service Manuals may be obtained at a nominal SAFETY NOTICE charge from HITACHI Sales Corporation.] USE ISOLATION TRANSFORMER...
  • Page 5: Service Notes

    Service Notes IMPORTANT: To protect against possible damage to Equipment needed to check the disabled circuit: the solid state devices due to arcing or static discharge, 1. Voltmeter (0 - 200V scale) make certain that all ground wires and CRT DAG wire are securely connected.
  • Page 6: Specifications

    Receiver Feature Table 27GX01B-501 FEATURE\MODEL 27GX01B-511 Chassis Tuning system # of channels Menu language Eng/Span/Fr Closed Caption V-Chip input Remote Model # HL00761 Picture tube M68LGLO61X V/A norm (X=both) MTS/SAP/DBX Volume Correction Built-in audio power 5Wx2 (10%) # of speakers...
  • Page 7: Operation

    Location of Controls (Receiver) Figure 1. Location of Controls Receiver Quick Reference Control Operation Quick Reference Control Operation Power Button - Press to turn ON or OFF. Volume Buttons - Press to adjust Sound Level, or to adjust Audio Menus, Video Menus, and select operating features when menus are displayed Channel Buttons - Press to select programmed channels.
  • Page 8: Location Of Controls (Remote)

    Press to turn TV Off in 30, 60, or 90 These buttons transmit minutes. chosen precoded VCR codes. TV/VCR Cursor Button Press to adjust Audio menus, Video HITACHI menus, select operating CLU-351U features when menus are displayed. Figure 2. Location of Controls (Remote) - 8 -...
  • Page 9: Remote Control Quick Reference Functional Key Chart

    Remote Control Quick Reference Functional Key Chart Operates Turns TV On and Off POWER CABLE Turns Cable Box On and Off Turns VCR On and Off INPUT Selects the TV Input Mode MENU Activates and Exits TV Menus Selects Channel Selects code in Video Lock Menu Selects Channel in Channel I.D.
  • Page 10 Operates SLEEP Selects 30, 60 or 90 minutes for Automatic Turn Off. Also use to turn Sleep Timer off by selecting NO MUTE Mutes TV Audio Access and exit Closed Captioning LST-CH Select previously tuned channel Mode Selection Buttons Selects TV Mode for the remote control CABLE CABLE Selects Cable Mode for the remote control...
  • Page 11 If your VCR cannot be operated been precoded into the remote. after performing above procedures, this means that your • In the unlikely event that your HITACHI codes have been cable box cannot be operated CLU-351U precoded into the remote. after...
  • Page 12 The remote control memory is limited. Some models of VCRs or cable boxes may not operate. The remote control is not designed to control all features that are available in all models. Code Index For VCRs VCR Brand Code (s) Emerson 00,01,10,16,23,33, 37,40, 43 Funai 09,22 00,14,15 Hitachi 14,26 09,12,28 Magnavox 16,23,26,45 Mitsubishi 09,35,46 Panasonic 15,22 06,07,08,09 Sony...
  • Page 13: Service

    Disassembly for Service Disassembly for CRT Back Cover Replacement Remove all the screws marked with an arrow( 1. Discharge the CRT as instructed in the Safety from the back of the Receiver. Precautions (see page 2). Note: Screw configuration, type, and number of 2.
  • Page 14: Chassis Service Adjustment Procedures

    Chassis Service Adjustment Procedures All service adjustments are factory preset and should not require adjustment unless controls and/or associated components are replaced. Note: Connect the (-) lead of the voltmeter to the appropriate ground. Use IC803’s heat sink when the HOT ground symbol ( ) is used.
  • Page 15: Purity And Convergence Procedures

    Purity and Convergence Procedure Adjustment is necessary only if the CRT or the For a 1-piece assembly (see Fig. 7): deflection yoke is replaced or if the setting was Position like tabs of purity devices together at 12 disturbed. The complete procedure consists of: o’clock to reduce any magnetic field effect.
  • Page 16 Initial Center Static Convergence Final Convergence Procedure (see Fig. 10 Connect a dot/cross hatch generator to the Receiver through Fig. 12): and tune in a signal. Observe misconvergence at Note: Vertical size and focus adjustments must be center of the screen only. completed prior to performing the convergence Adjust the R&B pole magnets;...
  • Page 17 As the yoke is tilted vertically, the rasters produced outside guns rotate in opposite directions. Figure 10. Vertical Yoke Movement Raster produced from one of the outside electron beams Raster from the other side electron beam R G B Static convergence magnets are set for center convergence As the yoke is tilted horizontally, one raster gets larger while the other gets...
  • Page 18: Serviceman Mode (Electronic Controls)

    Serviceman Mode (Electronic Controls) This Receiver has electronic technology using the I²C Bus Concept. It performs as a control function and it replaces many mechanical controls. Instead of adjusting mechanical controls individually, many of the control functions are now performed by using “On Screen Display Menu”. (The Serviceman Adjustment Mode.) Note: It is suggested that the technician reads all the way through and understand the following procedure for Entering/Exiting the Serviceman Adjustment Mode;...
  • Page 19: Sub-Data Adjustment

    Press the Power Button on the Remote Control to select the Serviceman Adjustment . For Adjustments: 1.Press Channel Up/Down on the Note: Write Down the original 2.Press Volume Up/Down on the Remote Control to select one of value set (b in Fig. 13 ) for Remote Control to adjust the each address...
  • Page 20: Pin Cushion Adjustment

    Press the Power Button on the Remote Control to select the Serviceman Adjustment For Adjustments: 1.Press Channel Up/Down on the Note: Write Down the original 2.Press Volume Up/Down on the Remote Control to select one of value set (b in Fig. 13 ) for Remote Control to adjust the each address...
  • Page 21: Pip Adjustment

    Press the Power Button on the Remote Control to select the Serviceman Adjustment For Adjustments: Note: Write Down the original 1.Press Channel Up/Down on the 2.Press Volume Up/Down on the Remote Control to select one of value set (b in Fig. 13 ) for Remote Control to adjust the the available Service Adjustments each...
  • Page 22: Options Adjustment

    Press the Power Button on the Remote Control to select the Serviceman Adjustment Adjustments: Note: Write Down the original 1.Press Channel Up/Down on the 2.Press Volume Up/Down on the Remote Control to select one of value set (b in Fig. 13 ) for Remote Control to adjust the the available Service Adjustments each...
  • Page 23: Comb Filter Adustment

    Press the Power Button on the Remote Control to select the Serviceman Adjustment For Adjustments: Note: Write Down the original 1.Press Channel Up/Down on the 2.Press Volume Up/Down on the Remote Control to select one of value set (b in Fig. 13 ) for Remote Control to adjust the the available Service Adjustments each...
  • Page 24: To Check Purity

    To Check Purity: Press the Recall Button on the Remote Control when in Serviceman Mode (red “CHK” is displayed) to enter the Purity Field Check Mode. NORMAL SCREEN Press Recall again to select desired field. BLUE GRN. WHITE SCREEN SCREEN SCREEN SCREEN Figure 14.
  • Page 25: Instructional Flow Chart For Serviceman Mode

    Instructional Flow Chart for Serviceman Mode NORMAL MODE Momentarily short FA1 to FA2 ( AGING MODE • Yellow “CHK” appears in upper left corner of screen. WHITE • Volume Up/Down operate rapidly. SCREEN • Custumer Controls are set to nominal level. RECALL QUICK ENTRY TO SERVICEMAN MODE (ON REMOTE)
  • Page 26 Instructional Flow Chart for Serviceman Mode - Continued CUT-OFF ADJUSTMENTS. C ITEMS. ON REMOTE CONTROL TO Adj. SELECT ADJUSTMENT needed? ON REMOTE TO ADJUST VOL VOL THE LEVEL POWER (ON REMOTE) PINCUSHION ADJUSTMENTS. D ITEMS. ON REMOTE CONTROL TO Adj. SELECT ADJUSTMENT needed? IMPORTANT NOTE:...
  • Page 27 Instructional Flow Chart for Serviceman Mode - Continued PIP ADJUSTMENTS. P ITEMS. ON REMOTE CONTROL TO Adj. SELECT ADJUSTMENT needed? ON REMOTE TO ADJUST VOL VOL THE LEVEL POWER (ON REMOTE) OPTIONS ADJUSTMENTS. S ITEMS. ON REMOTE CONTROL TO Adj. SELECT ADJUSTMENT needed? ON REMOTE TO ADJUST...
  • Page 28: Service Adjustments

    Service Adjustments (Electronic Controls) Sub-Brightness Procedure: 1. In the Serviceman Mode, select DAC Sub- Serviceman DAC Adjustment (B2) Brightness Adjustment (B2) and adjust for 1.5- Adjustment of this control is important for setting proper 1.9Vp-p between blanking and 7.5 IRE level. (See operation of customer brightness and contrast controls.
  • Page 29: Color Temperature Adjustment

    Color Temperature Adjustment 8. View scope trace at Horizontal rate and adjust the Serviceman Mode DAC (C0) level until a scanning (B/W Tracking) period of 195V above DC ground is measured, as indicated in Fig. 22. Serviceman DAC Adjust. (C0) (C1) (C2) (C4) (C5) 9.
  • Page 30: Horizontal Centering

    Service Adjustments (Electronic Controls, cont.) Horizontal Centering Stereo Separation Adjustment (M1 & M2) Preparation: Serviceman DAC Adjustment (D0) 1. Connect an RF signal generator to the RF antenna Preparation: input. Connect a crosshatch generator. Procedure: 2. Connect a scope to TPE10. 1.
  • Page 31: Clock Adjustment (S7)

    Service Adjustments (Electronic Controls, cont.) Clock Adjustment (S7) 5. Calculate based following formula: Preparation: Connect the frequency counter from TPS1 (IC001 244.1406 pin 13 Hz – Pin 13) to cold ground ( 0.901 ----------------------------------------------------------------- - 244.1406 Note: Frequency Counter probe capacitance should be 8pF or less.
  • Page 32: Circuits And Block Diagrams

    IC2201 AN5849S-E1V L OUT Tuner MPX In L Out R Out JK3002 IC3001 Front A/V SW R OUT M52790SP Input LAV3 LRF1 IC2351 IC2302 Bass/Tre/Bal Audio Out RAV3 RRF1 JK3001 Surround AN5272 CXA2021S L-AV1 JK3002 Input 1 L Out R-AV1 L1 Out L In L Out...
  • Page 33: Video-Chroma Signal Path Block Diagrams

    Video-Chroma Signal Path Block Diagram Figure 25. Video-Chroma Signal Path Block Diagram. - 33 -...
  • Page 34: Ic101 Vcj In/Out Pins And Functions

    IC101 IN/OUT Pins and Functions (VCJ) IC101 TA1310BN Velocity Scanning DC RC 56 DC Restoration Correction VSM Out Modulation Ground BP DET 55 Black Peak Detection Red Input Y In 54 Luminance Signal Input R In Green Input R-Y Input G In B-Y In Blue Input...
  • Page 35: Ic001 Mpu In/Out Pins And Functions

    IC001 IN/OUT Pins and Functions (MPU) IC001 MN101C46FTB VSS 42 Remote signal in RMIN OSC1 41 14.32MHz X-tal SDA1 OSC2 40 SCL1 14.32MHz X-tal VDD (VPP) 39 AFC1 ADIN0 +3.3V P42 38 SCL0 AFC2 ADIN1 SDA0 Key Scan 1 ADIN2 Not used/open Action ADIN3...
  • Page 36: Parts Identification

    Component Identification 3 screws at the top edge of the receiver 1 screw on the retainer screw 1 screw at the lower edge 1 screw at the lower plate for the AC power cord audio out jacks of the receiver edge of the receiver 1 screw by the 1 screw by the flyback...
  • Page 37: Component Identification

    Component Identification CRT (secured to cabinet by 4 screws on corners of CRT) Degaussing coil Anode (high voltage) Yoke C board ground VAO Out Speaker (4 screws) Speaker (4 screws) Flyback (T551) Tuner A/V jacks Note: After servicing receiver, remember to dress the cables, as shown. Figure 29.
  • Page 38 Component Identification MTS processor IC2201 is located on the other side of the board. LOCATION OF COMPONENTS INTEGRATED CIRCUITS CONNECTORS TRANSISTORS VARIOUS IC 001 MPU FRONT AV IN Q501 H. DRIVE T551 (FLYBACK) IC 002 EEPROM FRONT KEYPAD Q551 H. OUT FUSE IC 101 VCJ REAR AV IN...
  • Page 39: Parts List

    REPLACEMENT PARTS LIST Models: 27GX01B-501 & 27GX01B-511 Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 40 REPLACEMENT PARTS LIST Models: 27GX01B-501 & 27GX01B-511 Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 41 REPLACEMENT PARTS LIST Models: 27GX01B-501 & 27GX01B-511 Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 42: Replacement Parts List

    REPLACEMENT PARTS LIST Models: 27GX01B-501 & 27GX01B-511 Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 43 REPLACEMENT PARTS LIST Models: 27GX01B-501 & 27GX01B-511 Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 44 REPLACEMENT PARTS LIST Models: 27GX01B-501 & 27GX01B-511 Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 45 REPLACEMENT PARTS LIST Models: 27GX01B-501 & 27GX01B-511 Important Safety Notice: Components printed in BOLD TYPE have special characteristics important for safety. When replacing any of these components use only manufacturer’s specified parts. REF NO. PART NO. DESCRIPTION REF NO. PART NO.
  • Page 46 DESCRIPTION OF ABBREVIATIONS GUIDE RESISTOR TYPE TOLERANCE Carbon +/- 1% Fuse +/- 5% Metal Oxide +/- 10% Solid +/- 20% Wire Wound +/- 2% RES, C 270-J-1/4 CAPACITOR TYPE TOLERANCE Ceramic +/- 0.25pF Electrolytic +/- 0.5pF Polyester +/- 1pF Styrol +/- 5% Tantalum +/- 10%...
  • Page 47 NOTES - 47 -...
  • Page 48 Printed in USA V00062000ME0609...
  • Page 49 A-Board Schematic (Left Portion) Voltage Measurements Schematic Notes Waveform Measurements 1. Voltage measurement: Voltage readings are nominal 1. Resistors are carbon 1/4W unless (BOLD LINE) indicates the indicates waveform measurement. 5. Ground symbol shown and may vary ±10% on active noted otherwise.
  • Page 50 A-Board Layout - TNP2AH017 C-Board Schematic C-Board Layout - TNP2AA047 C-Board Voltage Measurements (Transistors) Q351 Q352 Q353 2.41 2.37 2.41 164.50 169.50 164.50 2.25 2.19 2.24 CHIP TRANSISTOR LEAD DESIGNATION Note: The board layouts have been modified to enhance and display traces otherwise hidden by a mask. ote: Voltages were obtained using a digital multimeter.
  • Page 51 A-Board Schematic (Right Portion) A-Board Voltage Measurements (ICs and Transistors) IC001 IC002 ..0.00 ..2.06 ..GND ..4.70 ..2.41 .

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