Hitachi 27CX01B Service Manual
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Hitachi 27CX01B Service Manual

Hitachi 27CX01B Service Manual

Solid state color television
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SERVICE MANUAL

» ELECTRICAL SPECIFICATIONS ......................................................................................................... 1

» IMPORTANT SERVICE SAFETY PRECAUTION ................................................................................. 2
» LOCATION OF USER'S CONTROL ..................................................................................................... 6
» INSTALLATION AND SERVICE INSTRUCTIONS ................................................................................ 7
» CHASSIS LAYOUT ............................................................................................................................. 13
» BLOCK DIAGRAM .............................................................................................................................. 14
» SCHEMATIC DIAGRAMS ................................................................................................................... 15
» PRINTED WIRING BOARD ASSEMBLIES ........................................................................................ 22
» REPLACEMENT PARTS LIST ............................................................................................................ 25
» PACKING OF THE SET ...................................................................................................................... 33
POWER INPUT .................................................... 120 V AC 60 Hz
POWER RATING .................................................................. 110 W
PICTURE SIZE ........................................... 2,187cm
CONVERGENCE ............................................................. Magnetic
SWEEP DEFLECTION .................................................... Magnetic
FOCUS ............................................... Hi-Bi-Potential Electrostatic
INTERMEDIATE FREQUENCIES
Picture IF Carrier Frequency ..................................... 45.75 MHz
Sound IF Carrier Frequency ...................................... 41.25 MHz
Color Sub-Carrier Frequency .................................... 42.17 MHz
AUDIO POWER
OUTPUT RATING .............. 1.3W + 1.3W (at 10% distortion and
CAUTION:
Before servicing this chassis, it is important that the service technician read the "Safety Precaution" and "Product
Safety Notices" in this service manual.
In the interests of user-safety (Required by safety regulations in some countries) the set should be restored to its
original condition and only parts identical to those specified should be used.
Components having special safety characteristics are identified by a å on the schematics and on the parts list in this Service Data
and its supplements and bulletins. Before servicing the chassis, it is important that the service technician read and follow the "Safety
Precautions" and "Product Safety Notices" in this Service Manual.
*For continued x-radiation protection, replace picture tube with original type of Hitachi approved equivalent type.
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMEN
SOLID STATE COLOR TELEVISION
MAY 2000
TENTATIVE
CONTENTS
ELECTRICAL SPECIFICATIONS
2
(339sq inch)
(Nominal)
Dual CH Operate)
SAFETY NOTICE
USE ISOLATION TRANSFORMER WHEN SERVICING
HHEA-MANUFACTURING DIVISION
1
PA
No. 0137
27CX01B
R/C: CLU-341U
SPEAKER
SIZE ...................................................................... 8 cm (Round)
VOICE COIL IMPEDANCE ............................ 32 ohm at 400 Hz
ANTENNA INPUT IMPEDANCE
VHF/UHF ..................................................... 75 ohm Unbalanced
TUNING RANGES
VHF-Channels ............................................................... 2 thru 13
UHF-Channels ............................................................ 14 thru 69
CATV Channels ........................................................... 1 thru 125
Page
(EIA, Channel Plan U.S.A.)
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Summary of Contents for Hitachi 27CX01B

  • Page 1: Table Of Contents

    Before servicing the chassis, it is important that the service technician read and follow the "Safety Precautions" and "Product Safety Notices" in this Service Manual. *For continued x-radiation protection, replace picture tube with original type of Hitachi approved equivalent type. SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMEN...

  • Page 2: Important Service Safety Precaution

    IMPORTANT SERVICE SAFETY PRECAUTION Service work should be performed only by qualified service technicians who are throughly familiar with all safety checks and the servicing guidelines which follow: WARNING X-RADIATION AND HIGH VOLTAGE LIMITS 1. For continued safety, no modification of any circuit 1.
  • Page 3 IMPORTANT SERVICE SAFETY PRECAUTION (Continued) • Connect the resistor connection to all exposed metal BEFORE RETURNING THE RECEIVER parts having a return to the chassis (antenna, metal (Fire & Shock Hazard) cabinet, screw heads, knobs and control shafts, escutcheon and etc.) and measure the AC voltage Before returning the receiver to the user, perform drop across the resistor.
  • Page 4 PRECAUTIONS A PRENDRE LORS DE LA REPARATION Ne peut effectuer la réparation qu' un technicien spécialisé qui s'est parfaitement accoutumé à toute vérification de sécurité et aux conseils suivants. AVERTISSEMENT LIMITES DES RADIATIONS X ET DE LA HAUTE TENSION 1. N'entreprendre aucune modification de tout circuit. C'est dangereux.
  • Page 5 PRECAUTIONS A PRENDRE LORS DE LA REPARATION (Suite) • Toucher avec la sonde d'essai les pièces métalliques VERIFICATIONS CONTRE L'INCEN-DIE ET exposées qui présentent une voie de retour au LE CHOC ELECTRIQUE châssis (antenne, coffret métallique, tête des vis, Avant de rendre le récepteur à l'utilisateur, effectuer arbres de commande et des boutons, écusson, etc.) les vérifications suivantes.

  • Page 6: Location Of User's Control

    LOCATION OF USER'S CONTROL Front Panel IN 2 VIDEO/AUDIO TERMINALS (VIDEO/AUDIO terminals are also POWER – POWER provided on the rear.) Press → On. Press again → Off. CHANNEL UP/DOWN ( ) Selects next higher channel. VOLUME UP/DOWN ( ) Selects next lower channel. "...

  • Page 7: Installation And Service Instructions

    INSTALLATION AND SERVICE INSTRUCTIONS Note: (1) When performing any adjustments to resistor controls and transformers use non-metallic screwdrivers or TV alignment tools. (2) Before performing adjustments, the TV set must be on at least 15 minutes. HIGH VOLTAGE CHECK CIRCUIT PROTECTION High voltage is not adjustable but must be checked The receiver is protected by a 4.0A fuse (F701), mounted on PWB-A, wired into one side of the AC...
  • Page 8 For adjustments of this model, the bus data is converted to various analog signals by the D/A converter circuit. Note: There are still a few analog adjustments in this series such as focus and master screen voltage. Follow the steps below whenever the service adjustment is required. See "Table-B" to determine, if serv- ice adjustments are required.
  • Page 9 DATA SERVICE ADJUSTMENT ITEM ADJUSTMENT CONTENTS NUMBER RANGE INITIAL VALUE PICTURE 00-7F TINT 00-7F COLOR 00-7F BRIGHTNESS 00-7F SHARPNESS 00-3F Must be set to "28" VERTICAL PHASE 00-07 Must be set to "00" HORIZONTAL PHASE 00-1F RF-AGC 00-3F VERTICAL AMP 00-3F PIF VCO 00-7F...

  • Page 10: Service Adjustment

    SERVICE ADJUSTMENT VCO Adjustment White Balance Adjustment 1. Connect a digital voltmeter between pin (44) of IC201 1. Receive a good local channel. and ground. 2. Enter the service mode and select the service 2. Receive a good local channel. adjustment "S03"...
  • Page 11 4. Models should be adjusted as follows. 4. Adjust "S04" data value to obtain normal brightness level. MODEL "S16" 27CX01B Vertical-Size Adjustment 1. Receive a good local channel. Sharpness and Audio Balance Adjust- 2. Enter the service mode and select the service ments adjustment "S09".

  • Page 12: Mts Adjustment

    MTS ADJUSTMENT MTS Level Adjustment 1. Feed the following monaural signal to pin (14) of IC3001. Monaural signal : 300Hz, 245mVrms 2. Connect the rms voltmeter to pin (39) of IC3001. 3. Enter the service mode and select the service adjustment "M01".

  • Page 13: Chassis Layout

    CHASSIS LAYOUT PWB-B PWB-K PWB-H PWB-A...

  • Page 14: Block Diagram

    BLOCK DIAGRAM...
  • Page 15 DESCRIPTION OF SCHEMATIC DIAGRAM WAVEFORM MEASUREMENT CONDITIONS: NOTES: 1. Photographs taken on a standard gated color bar 1. The unit of resistance "ohm" is omitted. (K=k Ω =1000 Ω , M=M Ω ) signal, the tint setting adjusted for proper color. The wave shapes at the red, green and blue cathodes of 2.
  • Page 16 SCHEMATIC DIAGRAM: MAIN-1 Unit...
  • Page 17 SCHEMATIC DIAGRAM: MAIN-2 Unit...
  • Page 18 SCHEMATIC DIAGRAM: CRT and FRONT AV Units...

  • Page 19: Schematic Diagrams

    SCHEMATIC DIAGRAM: S-VIDEO Unit...

  • Page 20: Printed Wiring Board Assemblies

    PRINTED WIRING BOARD ASSEMBLIES PWB-A : MAIN Unit (Wiring Side)
  • Page 21 PWB-A : MAIN Unit (Chip Parts Side)
  • Page 22 PWB-B : CRT Unit (Wiring Side) P 1 5 0 3 D 1 5 0 1 R 1 5 1 7 R 1 5 1 5 D 1 5 0 4 C 1 5 1 3 I C 1 5 0 1 R 1 5 1 3 R 1 5 1 2 L 1 5 0 3...

  • Page 23: Replacement Parts List

    3. NO. DE PIECE 4. DESCRIPTION in USA: Contact your nearest HITACHI Parts Distributor to order. in CANADA: Phone 1-800-HITACHI For location of HITACHI Parts Distributor, Please call Toll- 1-800-448-2244 Free; 1-800-HITACHI MARK: SPARE PARTS-DELIVERY SECTION MARQUE: SECTION LIVRAISON DES PIECES DE RECHANGE...
  • Page 24 Ref. No. Part No. Description Ref. No. Part No. Description PWB-A: DUNTKA126WEL4 COILS L201 VP-XF1R2K0000 Peaking 1.2µH MAIN UNIT (Continued) L202 RCiLi0588CEZZ VCO Coil L301 VP-XF8R2K0000 Peaking 8.2µH Q451 VS2SB709AR/-1 2SB709AR L302 RCiLi0613CEZZ IF Coil VS2SA1037KQ-1 RCiLi0605CEZZ Q601 VS2SC2482//-1 2SC2482 L401 VP-XF6R8K0000 Peaking 6.8µH...
  • Page 25 Ref. No. Part No. Description Ref. No. Part No. Description PWB-A: DUNTKA126WEL4 C807 VCCCCY1HH221J 220p Ceramic C908 VCEA0A1HW225M MAIN UNIT (Continued) C909 VCEA0A1HW225M C951 VCEA0A1HW106M C422 VCEA0A1CW476M C952 VCEA0A1HW106M C451 VCQYTA1HM104K Mylar C954 VCKYCY1HF103Z 0.01 Ceramic C452 VCEA0A1HW475M C955 VCEA0A1CW106M C453 VCEA0A1CW226M C956...
  • Page 26 Ref. No. Part No. Description Ref. No. Part No. Description PWB-A: DUNTKA126WEL4 R520 VRD-MN2BE184J 180k 1/8W Carbon R523 VRN-RL3AB1R0J M-Film MAIN UNIT (Continued) å R524 VRS-RG3AB391J 390 1W M-Ox. R526 VRD-MN2BE562J 5.6k 1/8W Carbon RJ49 VRD-MN2BE000J 1/8W Carbon R551 VRS-CY1JF472J 4.7k 1/16W M-Ox.
  • Page 27 Ref. No. Part No. Description Ref. No. Part No. Description PWB-A: DUNTKA126WEL4 S2502 QSW-K0079GEZZ Vol-Down MAIN UNIT (Continued) QSW-K0202PEZZ S2503 QSW-K0079GEZZ Vol-Up R2020 VRS-CY1JF223J 22k 1/16W M-Ox. R2023 VRS-CY1JF223J 22k 1/16W M-Ox. QSW-K0202PEZZ R2024 VRD-RA2BE682J 6.8k 1/8W Carbon S2504 QSW-K0079GEZZ CH-Down R2025 VRD-RA2BE682J 6.8k 1/8W...

  • Page 28: Crt Unit

    Ref. No. Part No. Description Ref. No. Part No. Description PWB-B: DUNTK9510WEK1 PWB-K: DUNTKA114WEK0 CRT UNIT S-VIDEO UNIT TRANSISTORS INTEGRATED CIRCUIT Q851 VS2SC3198-Y-1 2SC3198(Y) IC1501 VHiM52055FP-1 M52055FP Q852 VS2SC3789//2E 2SC3789 TRANSISTORS VS2SC3619LB1E You can substitute "VS2SD601AR/-1" for "VS2SC2412KQ-1". Q853 VS2SC3198-Y-1 2SC3198(Y) Q1501 VS2SC2412KQ-1 2SC2412K...

  • Page 29: Miscellaneous Parts

    Ref. No. Part No. Description Ref. No. Part No. Description PWB-H: DUNTK9310WEK1 MISCELLANEOUS PARTS FRONT AV UNIT MISCELLANEOUS PARTS ACC701 QACCD3070CESA AC Cord å QCNW-0259MEZZ Connecting Cord J1001 QJAKE0053GEZZ Jack, Video in QCNW-0134MEZZ Connecting Cord J1002 QJAKE0055GEZZ Jack, Audio in (L) QCNW-0145MEZZ Connecting Cord J1003 QJAKE0059GEZZ...

  • Page 30: Packing Parts

    Polyethylene Bag SPAKP0032MEZZ Polyethylene Sheet CABINET PARTS CCABA1336MES0 Front Cabinet Ass'y Not Available Front Cabinet GCOVA1011MEKA Lens for R/C GMADT0093MEKA Window for R/C HBDGE1007MESA Badge "HITACHI" JBTN-1057MEKA Button, Power, Vol-up/down JBTN-1058MEKA Button, Ch-up/down GCABB1159MEKA Rear Cabinet CABINET PARTS LOCATION 1-2 1-3...

  • Page 31: Packing Of The Set

    Ref. No. Part No. Description Ref. No. Part No. Description PACKING OF THE SET Polyethylene Bag Warranty & Registration Card Operation Manual Infrared R/C Unit Batteries Polyethylene Sheet Buffer Material FRONT Packing Case Serial Number Label Use 22 staples fix the packing case. Bar Code Label REAR Number Card...
  • Page 32 Ref. No. Part No. Description Ref. No. Part No. Description...

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