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TOSHIBA
SERVICE MANUAL
COLOUR TELEVISION
14N21NS
PRINTED IN UK. 2002 C
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SERVICING NOTICES ON CHECKING 1. KEEP THE NOTICES 6. AVOID AN X-RAY As for the places which need special attentions, Safety is secured against an X-ray by consider- they are indicated with the labels or seals on the ing about the cathode-ray tube and the high cabinet, chassis and parts. Make sure to keep the voltage peripheral circuit, etc. indications and notices in the operation manual. Therefore, when repairing the high voltage pe- ripheral circuit, use the designated parts and 2. AVOID AN EL
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CONTENTS SERVICING NOTICES ON CHECKING ...................................................................................................... A1-1 HOW TO ORDER PARTS ........................................................................................................................... A1-1 IMPORTANT ................................................................................................................................................ A1-1 CONTENTS ....................................
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GENERAL SPECIFICATIONS G-1 TV CRT CRT Size / Visual Size 14 inch / 335.4mmV System CRT Type Normal Deflection 90 degree Magnetic Field BV/BH +0.45G/0.18G Color System PAL Speaker 1 Speaker Position Bottom Size 1.5 x3.0 Inch Impedance 8 ohm Sound Output MAX 1.0 W 10%(Typical) 0.8 W DDR SECAM No NTSC3.58(AV)+NTSC4.43 Yes PAL60Hz Yes G-2 Tuning Broadcasting System CCIR System B/G System Tuner and System 1Tuner Receive CH Destination Ohers Tuning System F-Synth Input Impedance VHF/UH
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GENERAL SPECIFICATIONS G-7 On Screen Menu Yes Display Menu Type Character Picture Yes Contrast Yes Brightness Yes Colour Yes Tint (NTSC Only) Yes Sharpness Yes Audio No Bass No Treble No Balance No BBE On/Off No Stable Sound On/Off No CH Tuning Yes Matual Yes Auto Yes CH Allocation Yes Language Yes Clock Set No On/OffTimer Set Yes On Timer Set No Pin Code Registration No Panel Lock Yes Nicam Auto Off No AV Colour System Yes Sound System No Auto 4:3 Default No AV2 Output No Output Source No Sourc
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GENERAL SPECIFICATIONS G-10 Remote Unit RK-EY (CT-835) Control Glow in Dark Remocon No Format NEC Custom Code 40-BF h Power Source Voltage(D.C) 3V UM size x pcs UM-4 x 2 pcs Total Keys 32 Keys Keys Power Yes 1 Yes 2 Yes 3 Yes 4 Yes 5 Yes 6 Yes 7 Yes 8 Yes 9 Yes 0 Yes Volume Up / + Yes Volume Down / - Yes Previous Yes Select Picture Yes Menu Yes OK(Enter) Yes EXIT No Audio Select No Sleep Timer No Mute Yes T'TEXT Keys TEXT / MIX / TV Yes CH Up / Page Up Yes CH Down / Page Down Yes Re
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GENERAL SPECIFICATIONS G-12 Accessories Owner's Manual Language Swedish, Norwegian, Danish, Finnish, Turkish w/Guarantee Card No Remote Control Unit Yes Rod Antenna Yes Poles 2Pole Terminal D-type Loop Antenna No Terminal - U/V Mixer No DC Car Cord (Center+) No Guarantee Card No Warning Sheet No Circuit Diagram No Antenna Change Plug No Service Facility List No Important Safeguard Yes (Owner's Manual In) Dew/AHC Caution Sheet No AC Plug Adapter No Quick Set-up Sheet Yes Battery Yes UM size
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GENERAL SPECIFICATIONS G-16 Carton Master Carton No Content ---- Sets Material -- /-- Dimensions W x D x H(mm) -- x -- x -- Description of Origin Yes Gift Box Yes Material Double/Brown Dimensions W x D x H(mm) 440 x 408 x 380 Design As per Buyer's Description of Origin Yes Natural Dropping At 1 Corner / 3 Drop Test Edges / 6 Surfaces Height (cm) 62 Container Stuffing 866 Sets/40' container A3-5
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DISASSEMBLY INSTRUCTIONS 3. After one side is removed, pull in the opposite direction to 1. REMOVAL OF ANODE CAP remove the other. Read the following NOTED items before starting work. NOTE * After turning the power off there might still be a potential Take care not to damage the Rubber Cap. voltage that is very dangerous. When removing the Anode Cap, make sure to discharge the Anode Cap's INSTALLATION potential voltage. 1. Clean the spot where the cap was located with a small * Do not use pliers
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DISASSEMBLY INSTRUCTIONS 3. When IC starts moving back and forth easily after 2.REMOVAL AND INSTALLATION OF desoldering completely, pickup the corner of the IC using FLAT PACKAGE IC a tweezers and remove the IC by moving with the IC desoldering machine. (Refer to Fig. 2-3.) REMOVAL NOTE 1. Put the Masking Tape (cotton tape) around the Flat Some ICs on the PCB are affixed with glue, so be Package IC to protect other parts from any damage. careful not to break or damage the foil of each IC (Refer
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DISASSEMBLY INSTRUCTIONS INSTALLATION 4. When bridge-soldering between terminals and/or the soldering amount are not enough, resolder using a Thin- 1. Take care of the polarity of new IC and then install the tip Soldering Iron. (Refer to Fig. 2-8.) new IC fitting on the printed circuit pattern. Then solder each lead on the diagonal positions of IC temporarily. (Refer to Fig. 2-5.) IC Thin-tip Soldering Iron Soldering Iron Fig. 2-8 5. Finally, confirm the soldering status on four sides of the Sol
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SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter the Service Mode, press both set key and remote control key for more than 2 seconds. Set Key Remocon Key Operations Reset the user setting items (PICTURE, VOLUME and LANGUAGE) to the initial state VOL. (-) MIN 0 for delivery. Initialization of the factory. NOTE: Do not use this for the normal servicing. VOL. (-) MIN 1 If you set a factory initialization, the memories are r
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WHEN REPLACING EEPROM (MEMORY) IC If a service repair is undertaken where it has been required to change the MEMORY IC, the following steps should be taken to ensure correct data settings while making reference to TABLE 1. Note: No need setting for the position of the mark @ due to the adjustment value. INI +0 +1 +2 +3 +4 +5 +6 +7 +8 +9 +A +B +C +D +E +F 00 --- 00 00 00 00 41 80 48 00 23 27 01 03 30 06 14 10 10 00 80 80 80 3C 40 @ @ 9F @ 80 00 44 @ @ 20@@ @ @C000@20@00 18 @ 00 @ @ 0F 30 00 @ @ @
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ELECTRICAL ADJUSTMENTS 1. ADJUSTMENT PROCEDURE 2. BASIC ADJUSTMENTS Read and perform these adjustments when repairing the 2-1: CONSTANT VOLTAGE circuits or replacing electrical parts or PCB assemblies. 1. Place the set with Aging Test for more than 5 minutes. Connect the digital voltmeter to TP501. CAUTION 2. Set condition is AV MODE without signal. 3. • Use an isolation transformer when performing any 4. Adjust the VR501 until the DC voltage is 135 ± 0.5V. service on this chassis. • Before remo
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ELECTRICAL ADJUSTMENTS 2-6: FOCUS 2-10: BRIGHT CENT 1. Receive an 70dB monoscope pattern. 1. Receive the PAL black pattern*. (RF Input) 2. Turn the Focus Volume fully counterclockwise once. 2. Using the remote control, set the brightness and 3. Adjust the Focus Volume until picture is distinct. contrast to normal position. 3. Place the set with Aging Test for more than 15 minutes. 2-7: HORIZONTAL POSITION 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (17) on th
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ELECTRICAL ADJUSTMENTS 2-13: TINT 1. Receive the PAL color bar pattern. (Audio Video Input) 2. Using the remote control, set the brightness and contrast to normal position. 3. Connect the oscilloscope to TP023. 4. Activate the adjustment mode display of Fig. 1-1 and press the channel button (20) on the remote control to select "TINT". 5. Press the VOL. +/- button on the remote control until the section "A" becomes a straight line. (Refer to Fig. 2-2) "A" Fig. 2-2 2-14: Confirmation of Fixed Val
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ELECTRICAL ADJUSTMENTS 3-3: STATIC CONVERGENCE 3. PURITY AND CONVERGENCE ADJUSTMENTS NOTE NOTE Adjust after performing adjustments in section 3-2. 1. Receive the crosshatch pattern from the color bar 1. Turn the unit on and let it warm up for at least 30 minutes before performing the following adjustments. generator. 2. Combine red and blue of the 3 color crosshatch pattern 2. Place the CRT surface facing east or west to reduce the on the center of the screen by adjusting the pair of terrestrial
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TU001 ELECTRICAL ADJUSTMENTS 4. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (WIRING CONNECTION) CD801 CRT R807 TP023 CP801 J801 R803 CP802B TP022 CRT PCB CD802 J701 PH001 CP101 CP802A FB401 CP401 VR401 VR420 TP001 CRT R503 VR501 TP501 CP502 AC IN CP1001 CRT CD501 CP501 SPEAKER J1001 J702 J703 MAIN PCB D-5
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+ BLOCK DIAGRAM VOL UP AT+5V TU001 MAIN W/T.TEXT VOL DOWN IC101 OECF004A SCL SDA BPL AGC IF Q102 CH UP LED SW 40 ON_TIMER 4 5 7 1 11 Q103 D105 KEY_IN 56 CH DOWN ON TIMER I2C LED SW P.CON+5V 5 SDA 13 SDA CHROMA AVDD1 37 IC201 STV2246C V-DRIVE SCL 14 6 SCL STAND BY 8 6 7 IC401 TDA8714A 27 AVDD2 OSD-B 9 34 OSD-B MEMORY 21 AVDD3 AT+5V Vs 10 P.CON+25V IC199 S-24C04BDP-LA OSD-G 35 OSD-G 10 1 OSD-R OSD-R POWER OUTPUT 11 36 DY OS101 VERT 47 1 57 REMORT 3 TRIGGER INPUT CVBS2 29 29 CVBSOUT1 SCL 51
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R429 R424 J801 C502 R503 J703 C740 J702 SW104 R712 W015 IC1001 W011 SW102 SW106 J1001 SW107 C1003_1 CP801_1 R1010 D105_1 L102 OS101 W002 W819 W003 W014 R1005 L714 W821 W004 C131 C122 R806 W005 R1009 R741 D528 W834 D521 W806 W009 W006 R125 FH501 F501 FH502 D502 W026 CP501 W044 SW501 R107 W024 W043 W022 W030 W019 W031 W041 CC001 W018 R131 R133 W042 IC504 W032 D104 W833 W038 W029 W039 C1001 W035 W040 CP1001 D517 D519 W034 W027 W815 W037 W822 W054 W033 R517 W036 R620 D506 W057 W825 D609 D610 W058 C5
