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Toshiba 20N7XE Service Manual
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Toshiba 20N7XE Service Manual

Toshiba 20N7XE Service Manual

S9s chassis
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FILE NO. 060-200101
SERVICE MANUAL
COLOUR TELEVISION
S9S Chassis
20N7XE
PRINTED IN JAPAN, Jan., 2001 T

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  • Page 1 To CTV FILE NO. 060-200101 SERVICE MANUAL COLOUR TELEVISION S9S Chassis 20N7XE PRINTED IN JAPAN, Jan., 2001 T...

  • Page 2: Table Of Contents

    TABLE OF CONTENTS CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS ............................3 SET-UP ADJUSTMENT ............................4 SERVICE MODE ..............................6 DESIGN MODE ................................ 9 ELECTRICAL ADJUSTMENT ..........................10 CIRCUIT CHECK ..............................17 CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA ..........................18 LOCATION OF CONTROLS ...........................

  • Page 3: Chapter 1 General Adjustments

    CHAPTER 1 GENERAL ADJUSTMENTS SAFETY INSTRUCTIONS WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” AND “PRODUCT SAFETY NOTICE” INSTRUCTIONS BELOW. X-RAY RADIATION PRECAUTION 1. Excessive high voltage can produce potentially hazard- 2. The only source of X-RAY RADIATION in this TV receiver ous X-RAY RADIATION.

  • Page 4: Set-Up Adjustment

    WARNING: BEFORE SERVICING THIS CHASSIS, READ THE “X-RAY RADIATION PRECAUTION”, “SAFETY PRECAU- TION” AND “PRODUCT SAFETY NOTICE” ON PAGE 3 OF THIS MANUAL. SET-UP ADJUSTMENT The following adjustments should be made when a complete realignment is required or a new picture tube is installed. Perform the adjustments in order as follows : 1.
  • Page 5 CONVERGENCE ADJUSTMENTS CIRCUMFERENCE CONVERGENCE ADJUSTMENT NOTE: Before attempting any convergence adjustments, the 1. Loosen the clamping screw of deflection yoke slightly to receiver should be operated for at least fifteen min- allow the yoke to tilt. utes. 2. Temporarily put a wedge as shown in figure 1. (Do not remove cover paper on adhesive part of the wedge.) CENTER CONVERGENCE ADJUSTMENT 3.

  • Page 6: Service Mode

    SERVICE MODE 1. ENTERING TO SERVICE MODE 1) Press o button once on 2) Press o button again to 3) While pressing the o button, Remote Control. keep pressing. press MENU button on TV set. Item Data (Service mode display) 2.
  • Page 7 4. SELECTING THE ADJUSTING ITEMS 1) Every pressing of CHANNEL s button in the service mode changes the adjustment items in the order of table-2. (t button for reverse order) Refer to table-2 for preset data of adjustment mode. (See SETTING & ADJUSTING DATA on page 18) 5.
  • Page 8 8. SELF DIAGNOSTIC FUNCTION 1) Press “9” button on Remote Control during display of adjustment menu in the service mode. The diagnosis will begin to check if interface among IC’s are executed properly. 2) During diagnosis, the following displays are shown. Indicated color of mode now selected : Green and Red Indicated color of other modes : White...

  • Page 9: Design Mode

    DESIGN MODE 1. ENTERING TO DESIGN MODE 1) Select the Service mode. 2) While pressing o (or CALL) button on 3) Press MENU button on TV. Remote and press MENU button on TV. ITEM Press DATA Press (Design mode) (Adjustment mode) When QA02 is initialized, items “OPT0”...

  • Page 10: Electrical Adjustment

    ELECTRICAL ADJUSTMENT ITEM ADJUSTMENT PROCEDURE FOCUS VR ADJ. 1. Enter the service mode, then select any register item. 2. Press the TV/VIDEO button on the Remote until the black cross-bar pattern ap- pears on the screen. 3. Adjust the FOCUS control (on T461) for well defined scanning lines on the picture screen.
  • Page 11 ITEM ADJUSTMENT PROCEDURE WHITE BALANCE 1. Set Contrast to 40, and brightness to +20 by picture control. ADJUSTMENT 2. Set the TV in service mode, and get the inside W/B adjusting signal with VIDEO button. • CUTOFF ADJUSTMENT 3. Select RCUT, GCUT and BCUT with CHANNEL s, t buttons, to set individual (RCUT) values to 20, and to set GDRV and BDRV to 80 with VOLUME ;...
  • Page 12 MODEL: S9S Series (Reference factory adjustments) NO ADJUSTMENT 1. SUB CONTRAST (Measuring point) Q501 #14 R-OUT (Adjusting signal) Sub Bright (NTSC) signal (Adjusting method) 1. BUS data of Q501 → Initial value RCUT (Q501 SUB ADDR:0C) (20H) → OFF Yγ (Q501 SUB ADDR:08/D7) →...
  • Page 13 NO ADJUSTMENT 3. SUB COLOR SECAM (THIS ADJUSTMENT AFTER SUB COLOR NTSC) (Measuring point) Q501 #12 B-OUT (Adjusting signal) SECAM color bar signal (Adjusting method) 1. Set BUS data of Q501 to the same value as that of SUB TINT adjustment. 2.
  • Page 14 4. SUB TINT (Measuring point) Q501 #12 B-OUT (Adjusting signal) Sub Bright (NTSC) signal (Adjusting method) 1. BUS data of Q501 → Initial value BDRV (Q501 SUB ADDR:0A) (80H) → Initial value BCUT (Q501 SUB ADDR:0E) (20H) → OFF COLOR LIMITER (Q501 SUB ADDR:0F/D2) →...
  • Page 15 6. SUB BRIGHT (Adjusting signal) SUB Bright (PAL or NTSC) signal (Adjusting method) 1. Set user control setting to the standard 1. 2. Change BRTC data (Q501 SUB ADDR:01/D7D0) to set black collapse numbers by eye check. 4 ± 1.5 SPEC BARS 7.
  • Page 16 NO ADJUSTMENT 9. SECAM OFFSET ADJUSTMENT (Measuring point) Q501#35 R-Y OUT #36 B-Y OUT (Adjusting signal) Color bar (SECAM) signal (Adjusting method) 1. Change SRY data (Q501 SUB ADDR:11/D7~D4) to coincide level of black and white part in color differential signal (R-Y) to the level of H. BLK part. SPEC B-Y/R-Y mV p-p...

  • Page 17: Circuit Check

    13. V901 ADJUSTMENT (Point) C.CRT adjusting magnetic field (Adjusting magnetic field) Correction field Adjusting Confirming perpendicular field perpendicular field 35 µT 35 µT Mid Near East North field 35 µT 35 µT Russian North field 5 µT 5 µT Asia, Hongkong Zero field –50 µT –50 µT...

  • Page 18: Chapter 2 Specific Informations

    CHAPTER 2 SPECIFIC INFORMATIONS SETTING & ADJUSTING DATA SAFETY INSTRUCTIONS 20" HIGH VOLTAGE AT ZERO BEAM: 24.6kV MAX HIGH VOLTAGE: 26.0 kV AC VOLTAGE: 110~240V Table-1 SERVICE MODE ADJUSTING ITEMS AND DATA IN THE SERVICE MODE: Item Name of adjustment Preset Data Item...

  • Page 19: Location Of Controls

    LOCATION OF CONTROLS VIDEO AUDIO MENU L-MONO VIDEO AUDIO MENU VIDEO INPUT(2) L-MONO VIDEO POWER SWITCH VIDEO INPUT (2) INFRARED RECEIVING AUDIO (L/MONO) WINDOW POWER INDICATOR VIDEO INPUT AUDIO CHANNEL UP/DOWN HEAD PHONE JACK VOLUME UP/DOWN MENU TV/VIDEO o Sound Mute CALL (On-screen call) CALL/ f Power on/standby...

  • Page 20: Programming Channel Memory

    PROGRAMMING CHANNEL MEMORY Auto search memory (ASM) Example Skipping position 13 All the channels that can be received are preset automatically. 1 Select Position 13. 1 Select the position for starting ASM, (0~9) or ( / ). Press ( / ) repeatedly until 13 is displayed. 2 Set the correct broadcast system for your region.

  • Page 21: Circuit Block Diagram

    – 21 –...

  • Page 22: Chassis And Cabinet Replacement Parts List

    • The part number must be used when ordering parts, in order to assist in processing, be sure to include the Model number and Description. • The PC board assembly with mark is no longer available after the end of the production. Model :20N7XE Capacitors ..... CD Ceramic Disk : Plastic Film : Electrolytic Resistors ....
  • Page 23 Location Location Part No. Description Part No. Description EL, 4.7?F, ±20%, 50V EL, 10?F, ±20%, 16V C622 24797479 CA68 24794100 C661 24591102 PF, 1000pF CA69 24232103 CD, 0.01?F, +80%, -20% EL, 10?F, ±20%, 16V C662 24591102 PF, 1000pF CA98 24794100 EL, 10?F, ±20%, 16V C663 24794100...
  • Page 24 Location Location Part No. Description Part No. Description R402 24366103 CF, 10k ohm R883 24552752 OMF, 7500 ohm, 1/2W R403 24366472 CF, 4700 ohm R884 24552752 OMF, 7500 ohm, 1/2W R405 24366104 CF, 100k ohm R890 24381333 OMF, 33k ohm, 1/2W R407 24366272 CF, 2700 ohm...
  • Page 25 Location Location Part No. Description Part No. Description RA67 24366103 CF, 10k ohm RV26 24366101 CF, 100 ohm RA68 24366103 CF, 10k ohm RV27 24366103 CF, 10k ohm RA70 24366333 CF, 33k ohm RV30 24366750 CF, 75 ohm RA71 24366683 CF, 68k ohm RV31 24366820...
  • Page 26 Location Location Part No. Description Part No. Description Q801 23906189 IC, STR-Z4202A D618 23118859 Diode, 1SS133 Q830 23314141 Transistor, 2SC3852 D619 23118859 Diode, 1SS133 Q830B 70391356 Screw, BITTB3X10 SZN D801 23316275 Diode, RBV-606, LFA Q840 23318299 IC, L78MR05 D830 23118528 Diode, Zener, RD5.6ESA B3 Q840B 70391356...
  • Page 27 ACCESSORIES ACCESSORIES ACCESSORIES ACCESSORIES K902 23306191 Remote Hand Unit, CT-9879 AT03 23588016 Battery Cover Y101A 23565182 Owner’s Manual, English, 20N7XE Y120 23943846 Cover, Poly CABINET PARTS CABINET PARTS CABINET PARTS CABINET PARTS CABINET PARTS A201 23540498 Front Cover A263 23430419...
  • Page 28 THIS PAGE IS INTENTIONALLY LEFT BLANK. – 28 –...

  • Page 29: Pc Boards Bottom View

    MAIN BOARD PD0007 BOTTOM (FOIL) SIDE – 29 – – 30 –...
  • Page 30 BACK TERM/AV BOARD PB8980 BOTTOM (FOIL) SIDE CRT DRIVE BOARD PB9165 BOTTOM (FOIL) SIDE – 31 – – 32 –...

  • Page 31: Terminal View Of Transistors

    TERMINAL VIEW OF TRANSISTORS 2SD2253 2SC3852 2SC752GTM 2SC752 2SA1788 (old) 2SD1763A 2SA562TM 2SC2482 2SC5243 2SC1569 2SA1015 2SC2655 2SC4544 2SC4721P 2SC1815 2SA1788 2SC2878 2SA1306 2SC1740S 2SA1186A 2SC2120 2SA9335 2SD1554 ON4409 RN2203 RN2201 2SD2253 RN2004 2SD2553 RN1203 2SD1556 RN1204 2SC5143 RN2204 RN1205 RN1202 RN1201 –...
  • Page 32 MEMO ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................– 34 –...
  • Page 33 MEMO ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................– 35 –...
  • Page 34 MEMO ..........................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................................– 36 –...

  • Page 35: Specifications

    SPECIFICATIONS Television system and channel coverage (Aerial input) available – not available CHANNEL SYSTEM 20N7XE PAL B/G CCIR VHF 2-12, UHF 21-69, CATV*1 PAL D/K CHINA VHF 1-12, UHF 13-57, CATV*2 PAL I UHF 21-69 SECAM B/G CCIR VHF 2-12, UHF 21-69, CATV*1...
  • Page 36 TOSHIBA CORPORATION 1-1, SHIBAURA 1- CHOME, MINATO-KU, TOKYO 105-8001, JAPAN next page...
  • Page 37 RETURN SCHEMATIC DIAGRAM MODEL : 20N7XE WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAUTION" AND "PRODUCT SAFETY NOTICE" ON THE MANUAL FOR THIS MODEL. CAUTION: The international hazard symbols "*" in the schematic diagram and the parts list designate components which have special characteristics important for safety and should be replaced only with types identical to those in the original circuit or specified in the parts list.
  • Page 38 SCHEMATIC DIAGRAM MODEL : 20N7XE NOTE: WARNING: BEFORE SERVICING THIS CHASSIS, READ THE "X-RAY RADIATION PRECAUTION", "SAFETY PRECAUTION" AND "PRODUCT SAFETY NOTICE" ON THE MANUAL FOR THIS MODEL. 1. RESISTOR Resistance is shown in ohm [K = 1.000, M = 1.000.000]. All resistors are 1/6W and 5% 4.

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