Hitachi C21-FL21F Service Manual
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Hitachi C21-FL21F Service Manual

Hitachi C21-FL21F Service Manual

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HITACHI
SERVICE MANUAL
NOTE : To ensure the safety of customer, special protection circuitry is added to avoid failures due to abnormal
commercial input voltage from power line which excess the maximum operation range of AC 264V.
The special protection circuitry activate approximately at AC 300V by cutting off main fuse F901.
Hence to prevent serious failures, such as smoke, fire etc...
CAUTION :
Before servicing this chassis, it is important that the service techician reads the " Safety Precaution "
and " Product Safety Notices " in this Service Manual.
* Enclosed with Circuit Diagram and Printed Wiring Board.
CONTENTS
SAFETY PRECAUTIONS ........................................................................... 2
PRODUCT SAFETY NOTICE ...................................................................... 2
REMOTE CONTROL UNIT ........................................................................ 3
GENERAL OPERATIONS GUIDE ................................................................. 4
FAILURE DETECTING FUNCTION OF MAIN DEVICES .................................... 5
CIRCUIT DESCRIPTION ..................................................................... 6 - 10
ADJUSTMENT INSTRUCTIONS .......................................................... 11 - 19
REPLACEMENT PARTS LIST .............................................................. 20 - 31
SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT.
MARCH 2002
COLOR TELEVISION
Hitachi Consumer Products ( THAILAND ) , Ltd.
HCPT No. 006E
C21-FL21F
V3AR Chassis

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Summary of Contents for Hitachi C21-FL21F

  • Page 1: Safety Precautions

    CIRCUIT DESCRIPTION …………………………………………………………… 6 - 10 ADJUSTMENT INSTRUCTIONS …………………………………………………. 11 - 19 REPLACEMENT PARTS LIST …………………………………………………….. 20 - 31 SPECIFICATIONS AND PARTS ARE SUBJECT TO CHANGE FOR IMPROVEMENT. COLOR TELEVISION MARCH 2002 Hitachi Consumer Products ( THAILAND ) , Ltd.
  • Page 2 HITACHI C21-FL21F HITACHI LTD. AV SYSTEMS FEATURES FULL FUNCTION REMOTE CONTROL PRESET TUNING ( VOLTAGE SYNTHESIZER - AUTO PRESET, MANUAL , FINE ) HYPERBAND TUNER AVL ( AUTO VOLUME LEVELLING) CHANNEL SKIP BLUE BACK AUTO OFF ON / OFF/ ALARM TIMER ( 0:00 - 24:00 )
  • Page 3 CONTROLS FRONT PANEL REMOTE CONTROL UNIT...

  • Page 4: Safety Precautions

    X - radiatuion. chassis. For continued X-radiation protection, replace tube with the same type as the original, HITACHI approved type. 3. When replacing the chassis in the cabinet,ensure all the protective devices are put back in place,such...

  • Page 5: Remote Control Unit

    REMOTE CONTROL UNIT FOR OTHER MODELS FOR T/TEXT MODELS ONLY POWER ON/OFF SWITCH PICTURE INPUT SELECTOR SOUND VOLUME UP/DOWN FM (NOT USING) PROGRAMME UP/DOWN MUTE RECALL CHI/II (FOR NICAM/A2 MODELS) SURROUND SOUND PROGRAMME SELECTOR (DIRECT KEY) MENU CURSOR TIMER T/TEXT FUNCTION KEY (T/TEXT MODELS ONLY) - 3 -...

  • Page 6: General Operations Guide

    GENERAL OPERATIONS GUIDE With this set, all adjustments/settings are performed by selecting from menu screens. Different menu screens and details of adjustments/settings are shown below. To access the menu screen, press the MENU button, then select the item by pressing the left/right cursor buttons. - 4 -...

  • Page 7: Failure Detecting Function Of Main Devices

    FAILURE DETECTING FUNCTION OF MAIN DEVICES In V3AR ,failure of Main devices can detect by the blinking indication of LED at front panel. ( Example : LED blinking time is 2 in cycle I002 is out of order. ) If an IIC error occurred, the LED, D001 blinks at 1Hz, 50% duty cycle. The blinking times are as below.

  • Page 8: Circuit Description

    CIRCUIT DESCRIPTION Selection and CPU circuitry IC type, TDA9381/86/65 performs functions like IIC controls, channel selection, on-screen display ,search tuning, systems selection amongst others. The pin's functions of TDA9381/86/65 are presented in the table shown below. Signal Configuration Function number name mode Power...
  • Page 9 Signal Configuration Function number name mode IREF Input Reference current input Vertical sawtooth capacitor AGCOUT Output Tuner AGC output AUDEEM Output Audio deemphasis DECSDEM Decoupling sound demodulator GND2 Ground 2 for TV processor SNDPLL Narrow band PLL filter REFO Output Subcarrier reference output HOUT Output...
  • Page 10 Signal Configuration Function number name mode VDDC Digital supply to core (3.3V) OSDGND Oscillator ground supply XTA/IN Input Crystal Oscillator input XTA/OUT Output Crystal Oscillator output RESET Input Reset VDDP Digital supply to periphery (+3.3 V) SCL(EEP) O.D. 3.3V Clock of secondary I C-bus for EEPROM SDA(EEP) O.D.
  • Page 11 IF signal is sent to I001 pin 23 and 24 for demodulation. For MONAURAL and AV STEREO mode, the demodulated signals are sent for video and audio selection. For NICAM/A2 mode, the demodulated signals are sent for video processing only. The composite video signals after demodulation are sent to a series of bandpass filters (X004 - X006) through pin 38 of I001.
  • Page 12 POWER SUPPLY CIRCUIT Commutating voltage from AC output rectified by D901A and produces approximately 300V to pin 3 of I901. Current flowing through R904, R917, causes I901 pin 4 to initially turn on. Secondary voltage are then induced winding V1 - V2 in T901, I901 supply voltage is obtained via R906, D906, C909 and applied to pin 4 of I901, thereby maintaining I902 switching operation.

  • Page 13: Adjustment Instructions

    ADJUSTMENT INSTRUCTIONS A. IIC ADJUSTMENTS Most of the adjustment items in the V3AR chassis are controlled by IIC. Adjustment items include video chroma IC (I001, UOC) control, sound multiplex ICs, horizontal & vertical deflection and others. To start the IIC adjustment, first turn off AC power switch. Press and hold down the TV/Video local key and then press the power switch.
  • Page 14 The following are the IIC Bus control and adjustment data for reference. Table 1: IIC-Bus Control and Adjustment DATA INITIAL ITEMS AFFECTED DURING CHANGE NAME OF ADJUSTMENT DATA MEMORY TDA9381/86/65 RANGE (hex) I002 I001 WHITE POINT R 00-3F WHITE POINT G 00-3F WHITE POINT B 00-3F...
  • Page 15 DATA INITIAL ITEMS AFFECTED DURING CHANGE NAME OF ADJUSTMENT DATA MEMORY TDA9381/86/65 RANGE (hex) I002 I001 30 SERVICE BLANKING 00-01 31 MATRIX NTSC 00-01 32 PAL,SECAM/NTSC 00-01 33 BYPASS OF CHROMA BASE BAND DL 00-01 34 AVL/SUBCARRIER 00-03 35 SYNCHRONIZATION OF OSD/TEXT 00-01 36 AFC WINDOW 00-01...
  • Page 16 DATA INITIAL ITEMS AFFECTED DURING CHANGE NAME OF ADJUSTMENT DATA MEMORY TDA9381/86/65 RANGE (hex) I002 I001 74 WINDOW SELECTION SOUND PLL 00-01 75 QSS OUT OR AM OUT 00-01 76 EHT TRACKING MODE 00-01 77 RGB/YUB SWITCH 00-01 78 RGB BLANKING MODE 00-01 80 V-SCAN DISABLED 00-01...
  • Page 17 SHIPPING DATA OF IIC SERVICE MODE (apply only when the memory IC, I002, change.) 1. Select the adjustment item, 323(Initialization of memory IC, I002) by pressing the cursor button on Remote control handset. 2. Set data of adjustment item, 323 to "01" by pressing the cursor button on Remote control handset.
  • Page 18 Table 2 : Shipping Data - 16 -...
  • Page 19 +B ADJUSTMENT PREPARATION PROCEDURES AC input voltage 230 + 5V(50Hz) Adjust R954 to obtain +B voltage as below Turns on the set and set the brightness and contrast to Max. 95 + 0.5V (Signal : Philips Pattern) After 30 sec heat-run, check & adjust the Measuring Points +B voltage +B voltage : C935 + side...
  • Page 20 VERTICAL SLOPE ADJUSTMENT(Must be done before V. Center and V. Size Adjustments) PREPARATION PROCEDURES Turns on the TV set & heat run about 5 min. Select the IIC control address No. 30. Receive the circular pattern signal (PLL) Press key on remote con. handset so Set all picture settings as below.
  • Page 21 WHITE BALANCE ADJUSTMENT PREPARATION PROCEDURES Switch on the TV set for at least 20 mins. Set black stretch (IIC service no. 58) to "0". Adjust this adjustment after the Purity adjustment. Set to lateral line mode (IIC service no. 80) from Ensure the vertical incident illumination on CRT surface "0"...

  • Page 22: Replacement Parts List

    REPLACEMENT PARTS LIST PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL SYMBOL PART No.
  • Page 23 REPLACEMENT PARTS LIST PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL SYMBOL PART No.
  • Page 24 REPLACEMENT PARTS LIST PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL SYMBOL PART No.
  • Page 25 REPLACEMENT PARTS LIST PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL SYMBOL PART No.
  • Page 26 REPLACEMENT PARTS LIST PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL SYMBOL PART No.
  • Page 27 REPLACEMENT PARTS LIST Components marked with a have special characteristics important to safety. Before PRODUCT SAFETY NOTE : replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL SYMBOL PART No.
  • Page 28 REPLACEMENT PARTS LIST PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL PART No.
  • Page 29 REPLACEMENT PARTS LIST PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL SYMBOL PART No.
  • Page 30 REPLACEMENT PARTS LIST PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL SYMBOL PART No.
  • Page 31 REPLACEMENT PARTS LIST PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL SYMBOL PART No.
  • Page 32 REPLACEMENT PARTS LIST PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL SYMBOL PART No.
  • Page 33 REPLACEMENT PARTS LIST PRODUCT SAFETY NOTE : Components marked with a have special characteristics important to safety. Before replacing any of these components, read carefully the PRODUCT SAFETY NOTICE of this Service Manual. Don't degrade the safety of the receiver through improper servicing SYMBOL SYMBOL PART No.
  • Page 34 HITACHI Hitachi Consumer Products ( Thailand ) , Ltd. 274 Moo 9 Sukhumvit Road, Tambol Teparak, Amphur Muang, Samutprakarn, Thailand 10270 Tel : (001-66-2) 394-4312 Fax : (001-66-2) 757-9979 Hitachi, Ltd. Head Office : 5-1 , 1-Chome, Marunouchi, Chiyoda-ku, Tokyo Tel : TOKYO (212) 1111 ( 80 Lines ) Cable Address : "...

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