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akira CT-21CH9 Service Manual

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Summary of Contents for akira CT-21CH9

  • Page 2 CHASSIS: CN-9 MODEL: CT-21CH9N Model No: CT-21CH9N Version 1.0...

  • Page 3: Table Of Contents

    CONTENT Specifications ..................4 General description ................5 Connector view ..................8 Safety instructions ................11 Circuit adjustments ....…............ 12 Set-up adjustment ................13 Service mode general instructions ............15 Service mode adjustment ..............19 Main repairing flow diagram .............. 20 Main ICs description and repair data offering ........

  • Page 4: Specifications

    SPECIFICATIONS RF system: Color system: PAIA.43, NTSC3.58, NTSC4.43, PAL-M, PAL-N Sound system: D/K, I, M, B/G Video system: PAIA.43, NTSC4.43, NTSC3.58, PAL-M, PAL-N (50/60Hz) Receiving channel: VHF: Cl~C12 (49.75 ~ 85.25MHz, 168.25 ~ 216.25MHz) UHF: C 13~C57 (471.25 ~ 863.25MHz) CATV: Zl~Z7 (111.0 ~ 167.0MHz) ZS~Z35 (223.0~447.0MHz) Programs Preset:...

  • Page 5: General Description

    GENERAL DESCRIPTION CN-9 is a CTV monolithic chassis. It introduces a monolithic IC TB1231N to carry out all the small signal processing. TB1231N is a kind of IC used by color TV in PAL/NTSC system, which is controlled by Inter IC Bus. Together with the SECAM decoder TA1275Z, it can form a signal processing circuit for multi-system color TV.

  • Page 11: Safety Instructions

    SAFETY INSTRUCTION WARNING: BEFORE EXAMINING AND SERVICING THIS CHASSIS, READ CAREFULLY THE FOLLOWING SAFETY INSTRUCTIONS. X-RAY RADIATION PRECAUTION 1. The EHT must be checked every time the receiver is serviced to ensure that the CRT does not emit X-ray radiation as result of excessive EHT voltage. The nominal EHT for this receiver is 27.5kv at zero beam current (minimum brightness) operating at AC 220V.

  • Page 12: Circuit Adjustments

    CIRCUIT ADJUSTMENTS GENERAL INFORMATIONS All adjustment are thoroughly checked and corrected when the receiver leaves the factory. Therefore the receiver should operate normally and produce proper colour and B/W pictures upon installation. However, several minor adjustments may be required depending on the particular location in which the receiver is operated.

  • Page 13: Set-Up Adjustment

    FOCUS ADJUSTMENT 1. Use the remote control to set the contrast to maximum and the brightness, chroma to medium. 2. Set H. V. lines near Philips picture center to thinnest with the focus adjustment potentiometer on the FBT. After finishing adjustment, ensure that no poor focusing exist near the center or around of the frame.

  • Page 15: Service Mode General Instructions

    CONVERGENCE ADJUSTMENTS NOTE: Before a attempting any convergence adjustments, the receiver should be operated for at least fifteen minutes. CENTRE CONVERGENCE ADJUSTMENT 1. Receive the pane pattern test signal. 2. Set the brightness and contrast for well-defined pattern. 3. Adjust two tabs of the 4-Pole Magnets to change the angle between them (See figure 5) and superimpose red and blue vertical lines in the centre area of the picture screen.
  • Page 17 Table 2 The BUS DATA FOR CN-9 Number Adjustment Item Adjustment Function Type Data RCUT Red Dark Balance GCUT Green Dark Balance BCUT Blue Dark Balance GDRN Green Light Balance BDRN Blue light Balance CNTX Sub contrast max BRTC Sub-bright centre COLC Sub color center (NTSC) TNTC...
  • Page 18 Number Adjustment Item Adjustment Function Type Data HITS Vertical amplitude deflection of 50/60 Hz VLIN Vertical line of 50 Hz Vertical S correction VLIS Vertical line deflection of 50/60 Hz SECAM B-Y SECAM R-Y R AGC RF AGC PIF VCO center HAFC AFC gain Volume 25%...

  • Page 19: Service Mode Adjustment

    3. ADJUSTMENT THE DATA Pressing of the MENU " " or " " button on remote control transmitter will change the value of data, in the range from 00 to FF. The variable range depends on the adjusting item. 4. EXIT FROM SERVICE MODE Use the keyboard on remote control transmitter or TV set to turn off the TV once.

  • Page 20: Main Repairing Flow Diagram

    6. VERTICAL AMPLITUDE ADJUSTMENT Enter the TV to the service mode, and receive pane test signals. Select the HIT item by pressing the item adjustment button on the remote transmitter, and adjust vertical amplitude by pressing the data, adjustment button so that vertical amplitude lacks a little. Continue to adjust vertical amplitude by pressing the data adjustment button until the first bar on pane signal touches edge of screen.

  • Page 26: Main Ics Description And Repair Data Offering

    MAIN ICS DESCRIPTION AND REPAIR DATA OFFERING 1. INTRODUCTION FOR IC TB1238AN (N201) TB1238AN is a PAL/NTSC system color TV specific monolithic IC currently developed by Toshiba Co., which is controlled by Inter IC Bus. TB1238AN includes a picture IF processing circuit, a sound IF processing circuit, PLL video detection circuit, PLL sound frequency discrimination circuit, a luminance signal processing circuit, PAL/NTSC chro-ma signal processing circuit and RGB signal processing circuit.
  • Page 28 Table 3 Pin functions and repair data of TB1238AN Index type multimeter (r=20k ) Resistance for GND 'Quiescent Dynamic (RxlK) Symbol Function state state Red pen Black measure measure DE-EMP Audio deemphasis capacitor connect pin AUDIO OUT Audio signal output IF VCC +9V supply input for IF amplify circuit...
  • Page 29 Horizontal deflection supply input H VCC 18.3 (+9V) SECAM identification/CW SID/CW OUT 11.2 signal output FBP IN Horizontal flyback pulse input SYNC OUT SYNC pulse output H VCC Horizontal excitation output DEF GND Ground (detection circuit) FBP IN Sandcastle pulse output VIDEO OUT Video signal output DIG.
  • Page 30 2. INTRODUCTION FOR CPU IC TMP87CM38N-3673 (N001) The pin functions and repair data of TMP87CM38N-3673 is listed in the table 4. Table 4 Pin functions and repair data of TMP87CM38N-3673 Index type multimeter (r=20k ) Resistance for GND Symbol Function Quiescent Dynamic (RxlK)
  • Page 31 Horizontal flyback for Vertical sync pulse for 14.8 OSD character OSC1 23.8 oscillator pin 1 OSD character OSC2 oscillator pin 2 TEST Test pin I0MHZ clock 24.3 oscillation input 10MHZ clock XOUT 24.3 oscillation output RESET CPU reset pin OPTION Option pin 14.5 Remote control...
  • Page 32 Repair data for IC TDA7057AQ(N601) TDA7057AQ is the audio power amplifier OF CN-9, the pin functions and repair data of it is listed in the table 5. Table 5 Pin functions and repair data of TDA7057AQ Index type multimeter (r=20k ) Resistance for GND Symbol Function...
  • Page 33 5. Repair data for IC TA8403(N401) TA8403 is the vertical output power amplifier IC of CN-9, the pin functions and repair data of it is listed in the table 7. Table 7 Pin functions and repair data of TA8403 Index type multimeter (r=20k ) Resistance for GND Symbol Function...
  • Page 34 7. Voltage data of pin for main audion Position Ub(v) -2.5 Uc(v) 11.5 11.5 11.5 11.5 15.2 Ue(v) 2.15 Position V5.03 V602 VS01 V802 V803 V804 V805 V806 V901 V902 V903 V904 V905 Ub(v) 15.2 11.5 -0.5 -0.4 Uc(v) -0.5 -0.4 36.5 36.5...

  • Page 35: Spare Parts List

    SPARE PARTS LIST OF 21BS32EA Main-board/AV-boa rd/K-board Location No. Part No. Name Description Rl12 51113470JU0 carbon film resistor 0.166W 47J R307 51113470JU0 carbon film resistor 0.166W 47J Rl16 51113560JU0 carbon film resistor 0.166W 56 J Rl15 51113680JU0 carbon film resistor 0.166W 68 J R080 51113101JU0...
  • Page 36 Main-board/AV-boa rd/K-board Location No. Part No. Name Description R048A 51113472JU0 carbon film resistor 0.166W 4.7KJ R025 51113472JU0 carbon film resistor 0.166W 4.7KJ R028 51113472JU0 carbon film resistor 0.166W 4.7KJ R009 51113822JU0 carbon film resistor 0.166W 8.2KJ R012 51113103JU0 carbon film resistor 0.166W 10KJ R013 51113103JU0...
  • Page 37 Main-board/AV-boa rd/K-board Location No. Part No. Name Description R988 51124681JU0 carbon film resistor 0.25W 680J R036 51124102JU0 carbon film resistor 0.25W 1KJ R045 51124102JU0 carbon film resistor 0.25W 1KJ R403 51124102JU0 carbon film resistor 0.25W 1KJ R411 51124102JU0 carbon film resistor 0.25W 1KJ R610 51124102JU0...
  • Page 38 Main-board/AV-boa rd/K-board Location No. Part No. Name Description R817 51124473JU0 carbon film resistor 0.25W 47KJ R818 51124513JU0 carbon film resistor 0.25W 51KJ R819 51124513JU0 carbon film resistor 0.25W 51KJ R510 51124563JU0 carbon film resistor 0.25W 56KJ R933 51124623JU0 carbon film resistor 0.25W 62KJ R936 51124623JU0...
  • Page 39 Main-board/AV-boa rd/K-board Location No. Part No. Name Description C018 5251C300JV0 Ceramic capacitor 63V 30PFJ C019 5251C300JV0 Ceramic capacitor 63V 30PFJ C114 5251C470JV0 Ceramic capacitor 63V 47PFJ C246 5251C470JV0 Ceramic capacitor 63V 47PFJ C247 5251C470JV0 Ceramic capacitor 63V 47PFJ C110 5251C820JV0 Ceramic capacitor 63V 82PFJ C022...
  • Page 40 Main-board/AV-boa rd/K-board Location No. Part No. Name Description C602 5253F103ZV0 Ceramic capacitor 63V 10nFZ C829 5253FlO3ZV0 Ceramic capacitor 63V 10nFZ C805 5253F103ZV0 Ceramic capacitor 63V 10nFZ C238 5253F103ZV0 Ceramic capacitor 63V I0nFZ C237 5253F103ZV0 Ceramic capacitor 63V 10nFZ C306B 5253F103ZV0 Ceramic capacitor 63V I0nFZ C108...
  • Page 41 Main-board/AV-boa rd/K-board Location No. Part No. Name Description C520 5236C104J10 Mylar capacitor 250V 0.1lìFJ C817 52337183J10 Mylar capacitor 50V 0.018ìFJ C409 52329473J10 Mylar capacitor 100V 0.047ìFJ C801 5246Q104M50 Polypropylene capacitor 250VAC 0.1ìFM C802 5246Q104M50 Polypropylene capacitor 250VAC 0.1ìFM C512 5241D394JC0 Polypropylene capacitor 400V 0.39ìFJ C504...
  • Page 42 Main-board/AV-boa rd/K-board Location No. Part No. Name Description C405 52626101M10 Aluminum electrolytic capacitor C35V 100ìFM C406 52626101M10 Aluminum electrolytic capacitor 35V 100ìFM C825 52626102M10 Aluminum electrolytic capacitor 35V 1000ìFM C227 52617*47MV0 Aluminum electrolytic capacitor 50V 0,47ìFM C208 52617010MV0 Aluminum electrolytic capacitor 50V lì...
  • Page 43 Main-board/AV-boa rd/K-board Location No. Part No. Name Description T100 5931165A000 Flyback transformer BSC65A T804 84726004900 Switch transformer BCK-45 T803 59351014600 Remote transformer PT0146 T803 84700004600 Remote transformer YKDB05 L501 59331000100 H. Drive transformer AD 0001 L501 84739003100 H. Drive transformer BCT-5 L505 55983390070...
  • Page 44 Main-board/AV-boa rd/K-board Location No. Part No. Name Description V821 611308RG257 Diode S2L60 D507 61411075 D40 Diode 2CK75D D507 61.414414840 Diode IN4148 V822 611120ITU260 Diode 2CZRU2 V823 611120ITU260 Diode 2CZRU2 D501 611120ITU260 Diode 2CZRU2 D505 611120ITU260 Diode 2CZItU2 DS01A 61138001Z40 Diode ZEM01Z D808 611120ES140...
  • Page 45 Main-board/AV-boa rd/K-board Location. No. Part No. Name Description V301 62418150YWY Audion 2SC1815 Y V303 62118150YW0 Audion 3Dg1815 Y V303 62418150YWY Audion 2SC1815 Y V805 62118150YW0 Audion 3DG1815 Y V805 62418150YWY Audion 2SC1815 Y V806 62118150YW0 Audion 3DG1815 Y V806 62418150YWY Audion 2SC1815 Y V602 6242878AOWY Audion...
  • Page 46 Main-board/AV-boa rd/K-board Location No. Part No. Name Description N945 671320038AY Integrate circuit HS0038A N945 672250638YY Integrate circuit SFH506 38 N945 67132003804 Integrate circuit HRM3800 FS01 59817122500 Delay time fuse tube ItT1 20 2.5A BC01 58310800080 XTLO JA18A 8MHz BC21 583D0443380 XTLO JA18A1 4.433619MHz S801...
  • Page 47 Y Board Location No. Part No. Name Description RW01 51113561J20 carbon film resistor 0.166W 560J RW03 51113561J20 carbon film resistor 0.166W 560J RW02 51124561JU0 carbon film resistor 0.25W 560J R902 51124200J30 carbon film resistor 0.25W 20J R903 51124471J30 carbon film resistor 0.25W 470J R905 51124471J30...
  • Page 48 Y Board Location No. Part No. Name Description V905 62210150Y40 Audion 3CG1015-Y V905 62510150Y4Y Audion 2SA1015-Y V904 62118150Y40 Audion 3DG1815-Y V904 62418150Y4Y Audion 2SC1815 V901 62124821060 Audion 3DG2482(FA-1 ) V901 6242482100Y Audion 2SC2482 (lq'A-1) V902 62124821060 Audion 3DG2482(FA-1 ) V902 6242482100Y Audion 2SC2482(FA-1 )

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