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JVC TV-20F242 Service Manual

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SERVICE MANUAL
CONTENTS
OPERATING INSTRUCTIONS (APPENDED)
STANDARD CIRCUIT DIAGRAM (APPENDED)
PARTS LIST
TV/VCR COMBO
TV-20F242
COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD.
2
3
4
18
30
53
No. 51768

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Summary of Contents for JVC TV-20F242

  • Page 1: Table Of Contents

    TV-20F242 SERVICE MANUAL TV/VCR COMBO TV-20F242 CONTENTS SPECIFICATIONS OPERATING INSTRUCTIONS (APPENDED) SAFETY PRECAUTIONS SPECIFIC SERVICE INSTRUCTIONS SERVICE ADJUSTMENTS GUIDE FOR REPAIRING STANDARD CIRCUIT DIAGRAM (APPENDED) PARTS LIST No. 51768 COPYRIGHT © 2000 VICTOR COMPANY OF JAPAN, LTD. Nov. 2000...

  • Page 2: Specifications

    SPECIFICATIONS TELEVISION Picture Tube: 20" (measured diagonally) Tuner Type: Quartz PLL Frequency Synthesized Receiving Channels: 2-13 14-69 CATV 14-36 (A)-(W) 37-59 (AA)-(WW) 60-85 (AAA)-(ZZZ) 86-94 (86)-(94) 95-99 (A-5)-(A-1) 100-125 (100)-(125) 01 (5A) Antenna Input: VHF/UHF In 75 ohms coaxial Speaker: 3", 8 ohms x 2 Audio Output Power: 1.5 + 1.5 W...

  • Page 3: Safety Precautions

    SAFETY PRECAUTIONS Operating the receiver outside of its cabinet or with its The picture tube used in this receiver employs integral back removed involves a shock hazard. Work on implosion protection. Replace with a tube of the same these models should only be performed by those who type number for continued safety.

  • Page 4: Specific Service Instructions

    SPECIFIC SERVICE INSTRUCTIONS DISASSEMBLY INSTRUCTIONS 1-3: TV/VCR BLOCK (Refer to Fig. 1-3) 1. REMOVAL OF MECHANICAL PARTS Remove the 2 screws 1. AND P.C. BOARDS Disconnect the following connectors: 1-1: BACK CABINET (Refer to Fig. 1-1) (CP401, CP502, CP4201 and CP4202). Remove the 6 screws 1.
  • Page 5 1-5: DECK SHIELD PLATE (Refer to Fig. 1-5) 1-7: JACK PLATE AND SYSCON PCB (Refer to Fig. 1-7) Remove the 2 screws 1. Remove the screw 1. Remove the screw 2. Remove the Syscon PCB in the direction of arrow (A). Remove the 2 screws 2.

  • Page 6: Removal Of Deck Parts

    NOTE 2. REMOVAL OF DECK PARTS When you install the Tape Guide L, install as shown in the 2-1: TOP BRACKET (Refer to Fig. 2-1) circle of Fig. 2-3-B. (Refer to Fig. 2-3-B) Remove the 2 screws 1. Slide the 2 supports 2 and remove the Top Bracket. NOTE Tape Guide L When you install the Top Bracket, install the screw (1)
  • Page 7 2-6: LINK ASS'Y (Refer to Fig. 2-6) 2-9: TENSION ASS'Y (Refer to Fig. 2-9-A) Set the Link Ass'y to the Eject position. Move the Inclined S Ass'y to the back side. Remove the (A) side of the Link Ass'y first, then remove Remove the Tension Spring.
  • Page 8 2-11: S REEL/T REEL (Refer to Fig. 2-11) NOTE Remove the S Reel and T Reel. Do not touch the Pinch Roller. (Use gloves.) Remove the 2 Polyslider Washers 1. When you install the Pinch Roller Block, install as shown in the circle of Fig.
  • Page 9 2-15: AHC ASS'Y/CYLINDER UNIT ASS'Y (Refer to Fig. 2-15) Middle Gear Unlock the support 1 and remove the AHC Ass'y. E-Ring Remove the 3 screws 2. Remove the Cylinder Unit Ass'y. Main Cam NOTE Pinch Roller Cam When you install the Cylinder Unit Ass'y, tighten the screws from (1) to (3) in order while pulling the Ass'y Joint Gear toward the left front direction.
  • Page 10 2-19: LOADING GEAR S/T ASS'Y (Refer to Fig. 2-19-A) 2. When you install the Clutch Actuator, install as shown in the circle of Fig. 2-19-C. (Refer to Fig. 2-19-C) Remove the E-Ring 1 and remove the Main Loading Gear. Remove the Capstan Brake Spring. Slide the Main Rod and remove the Capstan Brake Ass'y.

  • Page 11: Removal Of Anode Cap

    3. REMOVAL OF ANODE CAP 3. After one side is removed, pull in the opposite direction to 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.
  • Page 12 KEY TO ABBREVIATIONS Audio/Control H.SW Head Switch Automatic Color Control Hertz Audio Erase Integrated Circuit Automatic Frequency Control Intermediate Frequency Automatic Fine Tuning Indicator AFT DET Automatic Fine Tuning Detect Inverter Automatic Gain Control Killer Amplifier Left Antenna Light Emitting Diode A.PB Audio Playback LIMIT AMP...
  • Page 13 SYNC Synchronization SYNC SEP Sync Separator, Separation Transistor TRAC Tracking TRICK PB Trick Playback Test Point UNREG Unregulated Volt Voltage Controlled Oscillator Video Intermediate Frequency Vertical Pulse, Voltage Display V.PB Video Playback Variable Resistor V.REC Video Recording Visual Search Fast Forward Visual Search Rewind Voltage Super Source V-SYNC...

  • Page 14: Service Mode List

    SERVICE MODE LIST This unit provided with the following SERVICE MODES so you can repair, examine and adjust easily. To enter SERVICE MODE, unplug AC cord till lost actual clock time. Then press and hold Vol (-) button of main unit and remocon key simultaneously.

  • Page 15: Preventive Checks And Service Intervals

    PREVENTIVE CHECKS AND SERVICE INTERVALS The following standard table depends on environmental conditions and usage. Unless maintenance is properly carried out, the following service intervals may be quite shortened as harmful effects may be had on other parts. Also, long term storage or misuse may cause transformation and aging of rubber parts. Time 1,000 1,500...
  • Page 16 CLEANING NOTE 2. TAPE RUNNING SYSTEM After cleaning the heads with isopropyl alcohol, do not When cleaning the tape transport system, use the run a tape until the heads dry completely. If the heads gauze moistened with isopropyl alcohol. are not completely dry and alcohol gets on the tape, 3.

  • Page 17: Note For The Replacing Of Memory Ic

    NOTE FOR THE REPLACING OF 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: Initial Data setting will not be possible if clock has been set.

  • Page 18: Service Adjustments

    SERVICE ADJUSTMENT SERVICING FIXTURES AND TOOLS (For 4 heads model) Torque Gauge PTU94002 Roller Driver X-JG153 X Value Adjustment VHS Alignment Tape Screwdriver Master Plane Reel Disk Height Torque Tape Short Jumper Adjustment Jig X-JG162A Cable (8 Pins) Tentelometer X-JG162F Cable (13 Pins) X-JG162Y Cable (5 Pins) Part No.

  • Page 19: Preparation For Servicing

    PREPARATION FOR SERVICING Basic Servicing Position (In case of needing to check on all blocks) Unplug the connector CP502, CP4201 and CP4202, then remove the TV/VCR Block from the set. Unplug the connector CP810, CP820 and CP805, then remove the Main PCB from the VCR Block. Connect as shown in the below figure using the Service Fixture.
  • Page 20 MECHANICAL ADJUSTMENTS 1. CONFIRMATION AND ADJUSTMENT 1-2: CONFIRMATION AND ADJUSTMENT OF TENSION POST POSITION Read the following NOTES before starting work. Set to the PLAY mode. • Place an object which weighs between 450g~500g on Adjust the Tension Adjust until the edge of the Tension the Cassette Tape to keep it steady when you want to Arm is positioning within 0.5mm range from the make the tape run without the Cassette Holder.
  • Page 21 1-4: CONFIRMATION OF VSR TORQUE 2. CONFIRMATION AND ADJUSTMENT OF TAPE RUNNING MECHANISM Operate within 4~5 seconds after the reel disk begins to turn. Tape Running Mechanism is adjusted precisely at the Install the Torque Gauge on the S Reel. Set to the Rewind factory.
  • Page 22 2-2: CONFIRMATION AND ADJUSTMENT OF AUDIO/ 2-3: TAPE RUNNING ADJUSTMENT CONTROL HEAD (X VALUE ADJUSTMENT) When the Tape Running Mechanism does not work well, Confirm and adjust the height of the Reel Disk. adjust the following items. (Refer to item 1-1) Confirm and adjust the position of the Tension Post.
  • Page 23 3. MECHANISM ADJUSTMENT PARTS LOCATION GUIDE 1. Tension Adjust X value adjustment driver hole 2. Tension Arm P4 Post 3. Guide Roller T Brake Spring 4. P1 Post T Reel 5. Audio/Control Head S Reel...
  • Page 24 1. ADJUSTMENT PROCEDURE 2. BASIC ADJUSTMENTS Read and perform these adjustments when repairing the (VCR SECTION) circuits or replacing electrical parts or PCB assemblies. 2-1: PG SHIFTER CAUTION Connect CH-1 on the oscilloscope to TP1002 and CH-2 • Use an isolation transformer when performing any to TP4201.
  • Page 25 2-3: RF AGC 2-8: WHITE BALANCE NOTE: Adjust after performing CUT OFF adjustment. Receive the VHF HIGH (70dB). Connect the digital voltmeter between the pin 5 of Place the set with Aging Test for more than 15 minutes. CP602 and the pin 1 (GND) of CP602. Receive the color bar pattern.
  • Page 26 2-13: VERTICAL SHIFT NOTE: Adjust after performing adjustments in section 2-12. Receive the center cross signal from the Pattern Generator. Using the remote control, set the brightness and contrast to normal position. Activate the adjustment mode display of Fig. 1-1 and press the channel button (07) on the remote control to select "V SHIFT".
  • Page 27 3. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (VCR SECTION) TP1002 TP1001 TP4001 CP602 TU601 VR6001 J4202 J4201 TP4201 SYSCON PCB...
  • Page 28 (TV SECTION) TP806 TP804 VR402 VR401 FH503 FB401 J801 FOCUS VOLUME T501 SCREEN VOLUME CRT PCB VR502 MAIN PCB...
  • Page 29 4. PURITY AND CONVERGENCE 4-3: STATIC CONVERGENCE ADJUSTMENTS NOTE Adjust after performing adjustments in section 4-2. NOTE Receive the crosshatch pattern from the color bar Turn the unit on and let it warm up for at least 30 generator. minutes before performing the following adjustments. Combine red and blue of the 3 color crosshatch pattern Place the CRT surface facing east or west to reduce the on the center of the screen by adjusting the pair of 4...

  • Page 30: Guide For Repairing

    GUIDE FOR REPAIRING IC DESCRIPTION SYSCON PCB OEC7043C (IC1001) PIN NO. PIN NAME DESCRIPTION MSSEN A I Input terminal of mecha state sensor. MSSEN B I Tape end sensor input signal. I Tape start sensor input signal. HI-FI ENV I Input terminal of Hi-Fi RF envelope. VIDEO ENV I Input terminal of video RF envelope.
  • Page 31 SYSCON PCB OEC7043C (IC1001) PIN NO. PIN NAME DESCRIPTION OSD VCC - 5V - Filter connection for HLF. VHOLD - Condenser connection for VHOLD. CVIN I Composite Video input terminal. - Ground. H SYNC I Input terminal for H-SYNC. V SYNC I Input terminal for V-SYNC.
  • Page 32 MECHANISM TIMING CHART SLOW : SETTING SPEED TO SERVO : CAPSTAN FWD ROTATING LOADING DIRECTION DIRECTION : MECHANICAL MOVEMENT AND CAPSTAN ROTATING (FWD) : CAPSTAN RVS ROTATING : MECHANICAL MOVEMENT (NO CAPSTAN ROTATING) DIRECTION EJECTION UNLOADING STP3 R. SLOW F. SLOW PB/STP STP2 FF/REW...

  • Page 33: Servo Timing Chart

    SERVO TIMING CHART SYSCON PCB IC1001 (OEC7043C) DPG 90 PIN DFG 89 PIN 24 Cycle H. SW. P 18 PIN CH 1 CH 2 V-SYNC (E-E) 59 PIN REC CTL (REC) 97 PIN V-SYNC (TRICK PB) 13 PIN • WAVEFORM CHANGES DEPENDED ON THE TAPE SPEED...

  • Page 34: Troubleshooting Guide

    TROUBLESHOOTING GUIDE (Television division) It dose not enter the power suppiy(1) When it pushed the Investigate unreg8V line and power button is it AT5V line. lighted? The 7th pin of cp810 Investigate D508. does it exist DC13V? Does the base voltage of Investigate the 28 pin of IC1001 Q502 and Q513 normal? Q512,Q513 make on/off?
  • Page 35 No sound. The voltage of CD355 Investigate speaker and and CD356 do change headphonejack. with the volume key? Investigate D505 and D534 The 1st pin of IC352 and the peripheral circuit. does it exist DC7.1V? The 2nd pin of IC352 Investigate IC352 and the does it exist DC3.5V? peripheral circuit.
  • Page 36 A color doesn't adhere to it Are the adjustment of Color is adjust. the color standard? Is it receive the sgnal of Receive signal of the color. the color? Is the waveform of the 36th Investigate the X602 and the pin of IC601 normal? peripheral circuit.
  • Page 37 An only horizontal line appears Is the waveform of the Investigate the IC601 and the 1st pin of IC401 normal? peripheral circuit. Investigate D411,R452 and a The 6th pin of IC401 peripheral circuit. does it exist DC25V? Investigate IC401,CP401 and the peripheral circuit.
  • Page 38 (Video division) Release playback Insert a cassette, push a PLAY button. Investigate a tape roading, Is the playback released roading belt, mode sensor, DD approximately 3 seconds motor, and cylinder motor. later? Is the playback released Investigate a reel sensor and approximately 6 seconds reel belt.
  • Page 39 When playback, a screen doesn't appear Whether it takes 5V for Investigate a power supply Whether does a screen IC4001 25, 54, 56, circuit. of E-E appear or not? 75, 87th pin or not? Whether there are PB Investigate a connection of Y/C signal for TP4001 IC4001 and cylinder.
  • Page 40 Noise (it is really back to have cleaned a head) for a picture when playback Whether does Exchange cylinder unit and TP4001 FM signal CP4001. appear or not? There is FM signal for Investigate a peripheral IC4001 88th ,89th circuit of IC4001. pin? There is FM signal for Investigate a peripheral...
  • Page 41 When playback, a sound doesn't appear Whether does a It refers to a clause of " E-E sound appear doesn't appear". with E-E or not? Investigates wound, whether a connector with an audio head is complete and inserted into Whether there is an CP4005 to investigate whether audio signal for IC4001 there isn't becoming dirty or not...
  • Page 42 Capstan DD motor doesn't rotate When playback, is the Investigate a power supply voltage of CP1004 circuit. 5th, 8th pin 5V? When playback, whether is voltage of IC1001 12th pin Exchange IC1001. 5V or not? When playback, whether is Investigate IC1001 76th,65th pin voltage of IC1001 4th pin and the peripheral circuit.
  • Page 43 A audio can't record it A bias level with L4003 Investigate Q4005 and is OK (approximately Q4006 peripheral circuit. 40Vp-p) Whether there is an Investigate IC5501 and the audio signal for peripheral circuit. IC4001 80th pin or not? Whether there is an Investigate IC4001 and the audio signal for IC4001 peripheral circuit.
  • Page 44 Though a cassette can insert it, a tape doesn't move Investigate a portion related to Does mode indicator roading motor and a mode appear in Display? sensor. Does VCR operate with Investigate IC1001 and CP1005. the remote control? Investigate a tact SW. Recording mechanism works, but no video recorded from input jack or tuner...
  • Page 45 No E-E (no video and audio from tuner) Whether TU601 7th pin Investigate a power supply is 5V or not, whether is circuit. 9th pin 30V or not? Whether is a video signal and audio signal Exchange IC601 and investigate IC601 53 and 57th pin the peripheral circuit.
  • Page 46 A sound shakes Whether is an audio Exchange an audio head. head wounded or not? Whether is an input level of IC1001 87th Exchange capstan DD unit. pin a sine wave of 2.5Vp-p or not? When playback, is a When playback, is a tension of 65th pin of tension of 3rd pin of Exchange IC1001.
  • Page 47 A cassette tape can't insert it Whether does WORM Investigate a front roading gear gear of a cassette roading and LOCKER. block move or not? When not inserting Investigate IC1001 to a cassette more, is investigate LED and a tension of 3, 4th photosensor of a MAIN PCB pin of IC1001 0V? and the peripheral circuit.
  • Page 48 When inserting cassette, it ejects immediately For whether it is a cassette Whether don't you defective product or not, enter it with an other cassette roading block cassette or not? defective product. If you cover an infrared Exchange EOT/BOT photo rays sensor, 3rd of IC1001, transister.
  • Page 49 Tape loading is OK, but unloads immediately Whether it takes UNREG Whether does a Investigate a power supply 12V for CP1005 2nd pin cylinder rotate or not? circuit. or not? When playback, it Whether does DC 5V pulse takes 1.3V for 5th depends on IC1001 76th pin or not ? pin of CP1005?
  • Page 50 When playback, a picture vertically finely shakes Whether does a noise appear for a screen or not? For tracking UP/DOWN Investigate P/B envelope. make, does a noise of a screen get with no? Whether is a height Adjust guide post height. of a guide post correct or not? Whether is PG SIFTER...
  • Page 51 When playback, fast forward or rewind mode is activated, unit stops immediately Whether does It refers to a clause of "Capstan capstan DD motor DD motor doesn't rotate" rotate or not? Whether does capstan belt Exchange capstan belt. normal or not? Whether there is a reel sensor pulse signal for Investigate Q1001 and R1006.
  • Page 52 When playback, a picture horizontally shakes Whether is FG output level of CP1005 3rd Exchange a cylinder motor. pin approximately 4.5Vp-p or not? Do you hang a load, become approximately 4V for 1.3V or Exchange IC1001. cylinders voltage of CP1005 5th pin? Exchange a cylinder motor.

  • Page 53: Tv-20F242

    TV-20F242 TV-20F242 TV-20F242 STANDARD CIRCUIT DIAGRAM NOTE ON USING CIRCUIT DIAGRAMS 1.SAFETY The Components identified by the symbol are critical for safety. For continued safety, replace safety critical components only with manufacturer’s recommended parts. 2.INDICATION OF PARTS SYMBOL [EXAMPLE] In the PC board...
  • Page 54 TV-20F242 TV-20F242 SEMICONDUCTOR BASE CONNECTIONS D I O D E CATHODE ANODE ANODE CATHODE 1SS133T-77 11E1-EIC 10ELS2N-TA1B2 SID1050CM FMV-3FULF027-102 GBL06L-6177 HZ11B3L TD 11EQS04N-TA1B2 21DQ09N-FC4 SLR-342MCT32 HZ27-1L TD 11ES1N-TA1B2 21DQ09N-TA2B1 SLR-342VCT32 MTZJ13B T-77 RD12FB-T7 RMPG06J-G3 MTZJ30B T-77 RU2AM V1 MTZJ33B T-77 MTZJ5.1B T-77...
  • Page 55 TV-20F242 TV-20F242 BLOCK DIAGRAMS TV BLOCK DIAGRAM V. OUTPUT IC401 LA78040 MICON/ OPERATION/ THERMAL Q610, Q611 DECK PROTECTION UNGER+8V AT+5V Q606 P.CON+8V AT+13V PUMP Q602, Q603 HIFI TU1_AUDIO_A P.CON+5V Q405 Q406 Y/C/AUDIO/ CHROMA HEAD AMP/ TU1_VIDEO IC601 M61203CFP H. OUTPUT...
  • Page 56 TV-20F242 TV-20F242 Y/C/AUDIO/HEAD AMP/IN/OUT BLOCK DIAGRAM HIFI X4001 Q604 3.579545MHz Q4009 BUFFER BUFFER Y/C/A/CCD/H.AMP IC4001 PULL LA71067M-MPB SP/LP/EP-H VX01 MICON/ TIMMING CLAMP INPUT_SEL DRIVER OPERATION/ TRICK_PB-H/EE-H H.SW DECK DATAIL EMPHA FM-EQ DOC_XO_CTL CLAMP CP4001 CONV C-LPF EP/LP-CH2 (L) Y-LPF MONITOR_V...
  • Page 57 TV-20F242 TV-20F242 MICON/OPERATION/DECK BLOCK DIAGRAM TIMER SYSCON MICON V. REC_ST_H IC1001 OEC7043B SW1001 VCR_A_MUTE HI-FI-ENV HIFI_ENV HIFI HI-FI-H.SW HIFI_H.SW TAB SW STEREO ST_SELECT AT + 5V MSSEN-A P. CON + 5V X_RAY_TEST X_RAY_TEST MS_SEN A POWER_FAIL_L POWER FAIL(DC) Q1009 XC-OUT(32KHz)
  • Page 58 TV-20F242 TV-20F242 HIFI BLOCK DIAGRAM J701 HIFI AUDIO/H.AMP/DEM IC5501 AN3662FBP FRONT_VIDEO_IN J4201 Y/C/AUDIO/ H.AMP/IN/OUT INPUT SW REAR_VIDEO_IN Y/C/AUDIO/ OUTPUT HF_COM H.AMP/IN/OUT J4202 AUDIO_OUT_R AUDIO_OUT_L Y/C_AUDIO TU1_AUDIO_A NORMAL_A FM LIM VCO-FO LOGIC V. REC_ST_H BLOCK HIFI_ENV. P.CON+5V HIFI_H.SW MICON/ VCR_A_MUTE OPERATION/ P.CON+9V...
  • Page 59 TV-20F242 TV-20F242 WIRING CONNECTION DIAGRAM INTERCONNECTION DIAGRAM COMB FILTER PCB PCB300 REMOCON SENSOR VEX911 OPERATION PCB OS753 PCB030 TEXA17 Vout TM101 J351 HALL MAIN ROTOR SENSOR COIL MAGNET FG SENSOR HALL HALL J701 CD353 CP4202 SWITCH LOGIC CP1004 FRONT VIDEO IN...
  • Page 60 TV-20F242 TV-20F242 CIRCUIT DIAGRAM [SYSCON PCB CHROMA/IF SCHEMATIC DIAGRAM] CHROMA/IF SCHEMATIC DIAGRAM (SYSCON PCB) FROM/TO MICON FROM/TO DIGITAL COMB FILTER IIC_OFF CP604 (CY901) DEGAUSS_H IMSA-9130B-06 POWER_FAIL[DC] P.CON+5V P.CON+5V OSD_R OSD_G C663 OSD_B C IN OSD_BLK 390P CH Y IN MONITOR_V MONITOR V.OUT...
  • Page 61 TV-20F242 TV-20F242 [SYSCON PCB Y/C/AUDIO/HEAD AMP SCHEMATIC DIAGRAM] Y/C/AUDIO/HEAD AMP SCHEMATIC DIAGRAM (SYSCON PCB) FROM/TO POWER P.CON+5V L4002 47uH FROM/TO HIFI 0305 NORMAL_A FROM/TO I/O Y/C_AUDIO B4002 FRONT_VIDEO_IN BL02RN1-R62 W900 W896 REAR_VIDEO_IN S810Y R4074 HF_COM BUFFER 1K 1/4W Q604 VIDEO_OUT...
  • Page 62 TV-20F242 TV-20F242 [SYSCON PCB MICON DIAGRAM] MICON SCHEMATIC DIAGRAM SERVICE R1032 (SYSCON PCB) TP1001 S819Y FROM/TO POWER AT+5V[UCON] C1041 AT+5V[BACKUP] 0.1 B P.CON+5V R1048 (D703) AT+12V MOTOR_GND 1K 1/4W W867 R1029 R1044 4.7K W808 3.3K C1034 R1053 0.1 F C1035...
  • Page 63 TV-20F242 TV-20F242 [SYSCON PCB IN/OUT DIAGRAM] IN/OUT SCHEMATIC DIAGRAM (SYSCON PCB) ON TIMER T-REC LED SW LED SW LED SW Q4201 Q4205 Q4206 DTC114EKA DTC114EKA DTC114EKA FROM/TO SOUND AMP SP_OUT_R SOUND_R+ SP_OUT_L SOUND_L+ TO PLATE DECK SILDE SOUND_GND CC4201 CC4202...
  • Page 64 TV-20F242 TV-20F242 [SYSCON PCB SOUND AMP CIRCUIT DIAGRAM] SOUND AMP SCHEMATIC DIAGRAM (SYSCON PCB) SOUND_AMP IC352 AN7522 HS352 763WAA0027 C350 FROM/TO I/O SOUND_R+ W874 SP_OUT_R W873 SP_OUT_L SOUND_L+ FROM/TO CHROMA/IF B301 SOUND+B BL01RN1-A63 SOUND_GND FROM/TO I/O SOUND_GND FROM/TO MICON R353...
  • Page 65 TV-20F242 TV-20F242 [SYSCON PCB HIFI CIRCUIT DIAGRAM] HIFI SCHEMATIC DIAGRAM (SYSCON PCB) C5514 0.33 B FROM/TO I/O FRONT_AUDIO_IN_R C5561 FRONT_AUDIO_IN_L REAR_AUDIO_IN_R 100P C5560 REAR_AUDIO_IN_L R5512 HIFI AUDIO/H.AMP/DEM AUDIO_OUT_R 100P IC5501 2.7M AN3662FBP AUDIO_OUT_L FROM/TO SOUND AMP C5506 0.1 B C5540 0.015 B...
  • Page 66 TV-20F242 TV-20F242 [SYSCON PCB POWER CIRCUIT DIAGRAM] POWER SCHEMATIC DIAGRAM (SYSCON PCB) 12.4 P.CON+8V REG. Q606 2SC2120Y P.CON+5V[CHROMA] REG. Q603 2SC13840W P.CON+5V[TU1] REG. FROM/TO Y/C/A/H.AMP Q602 2SC13840W AT+5V[UCON] P.CON+5V REG. Q611 D610 2SD734 AT+5V[BACKUP] SB10-03A3 REG. R644 FROM/TO MICON 8.7VREF...
  • Page 67 TV-20F242 TV-20F242 [MAIN PCB TV POWER CIRCUIT DIAGRAM] TV POWER SCHEMATIC DIAGRAM (MAIN PCB) DEGAUSS_H 6.3A 125V 2.5A 125V FROM/TO DEFLECTION CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE RELAY DRIVE 6.3A 125V(F501) ,2.5A 125V(F502).
  • Page 68 TV-20F242 TV-20F242 [MAIN PCB DEFLECTION CIRCUIT DIAGRAM] DEFLECTION SCHEMATIC DIAGRAM (MAIN PCB) V.OUTPUT IC401 LA78040 THERMAL PROTECTION PUMP UP 25.5 12.9 24.8 FROM/TO CHROMA/IF CP820_1 (CD601) 8283_1312_00_000 SOUND+B TO DY SOUND GND CP401 H.OUT B05B-DVS V.FEEDBACK C412 V.OUT 500V L402...
  • Page 69 TV-20F242 TV-20F242 [DIGITAL COMB FILTER CIRCUIT DIAGRAM] DIGITAL COMB FILTER SCHEMATIC DIAGRAM (COMB FILTER PCB) L901 820uH 0607 C907 6.3V C906 0.01 B C925 0.1 B C903 0.47 C923 220P CH BUFFER R905 Q901 2SC2412K C913 FROM/TO CHROMA/IF 0.01 B...
  • Page 70 TV-20F242 TV-20F242 [CRT PCB CIRCUIT DIAGRAM] CRT SCHEMATIC DIAGRAM (CRT PCB) RED AMP W853 Q810 2SC1740SP TP804 R828 2.7K 1/4W RED AMP Q801 123.5 2SC2621 R813 D801 220 1/4W 1SS133 R810 1.8K 1/4W FROM CHROMA/IF J801 GREEN AMP W849 CP805...
  • Page 71 TV-20F242 TV-20F242 [OPERATION PCB & AV PCB CIRCUIT DIAGRAM] OPERATION SCHEMATIC DIAGRAM (OPERATION PCB) FROM/TO I/O FROM/TO AV CD702 (CP4202) CD704 (CP704) CH2D001A CH2B032A FRONT VIDEO IN FRONT VIDEO IN FRONT AUDIO IN L FRONT AUDIO IN L W809 SOUND GND...
  • Page 72 TV-20F242 TV-20F242 [DECK PCB CIRCUIT DIAGRAM] DECK SCHEMATIC DIAGRAM LOADING MOTOR M101 (DECK PCB) S105 BOT SENSOR Q101 S106 RPT-38PB113 S101 S102 S103 S104 FROM/TO MICON CP101 (CP1006) 52044-0445 LDM+ LDM- PCB550 VE8851 NOTE: THIS SCHEMATIC DIAGRAM IS THE LATEST AT THE TIME...
  • Page 73 TV-20F242 TV-20F242 [MAIN/CRT PCB PATTERN] CP820_1 W012 R509 C405 VR401 VR402 TP806 S811X S810Y VR404 C806 Q512 W044 R520 Q505 W052 IC401 Q503 Q509 D803 Q508 R815 HS401 R413 R830 CP810_1 R508 C537 W050 R518 Q812 R821 W038 TP804 R811...
  • Page 74 TV-20F242 TV-20F242 [SYSCON/ COMB FILTER PCB PATTERN (CHIP MOUNTED PARTS)] R667 Q609 Q4206 R663 Q4205 Q4201 R1001 Q1002 Q4210 R1008 R4232 C1068 Q4212 R1083 R636 Q4203 Q1004 R631 W883 R649 C4209 C660 C1027 Q4211 R4069 C1025 R4203 R601 W912 C644...
  • Page 75 TV-20F242 TV-20F242 [SYSCON/ COMB FILTER PCB PATTERN (INSERTED PARTS)] CC4202 CP4202 TP4001 C916 L901 W345 W209 CY901 Q1013 CD302 W826 W208 TP1001 C5552 R5525 C5516 W207 W073 R5526 IC352 W202 C5535 SW1001 W200 W903 C5518 HS352 R1048 W198 C5529 W099...
  • Page 76 TV-20F242 TV-20F242 [AV PCB PATTERN] [DECK PCB PATTERN] CP101 J701_1 S105 S101 S104 S103 CP704 W018 W813 S102 W017 R702 W804 Q101 [OPERATION PCB PATTERN] SW798 W807 C353 W015 C755 W016 C781 SW796 SW799 SW797 W011 W014 SW751 W012 W013...
  • Page 77 TV-20F242 TV-20F242 WAVEFORMS TV POWER Y/C/AUDIO/HEAD AMP CHROMA/IF REC/PB REC/PB 5V 0.1ms/div 20.0V 20 s/div 200mV 20 s/div 2V 20 s/div 1V 10ms/div 100mV 5ms/div DEFLECTION REC/PB REC/PB 200mV 20 s/div 20.0V 20 s/div 5V 20 s/div REC/PB 1V 5ms/div 1V 0.5ms/div...
  • Page 78 TV-20F242 TV-20F242 35 200mV 2ms/div NOTE: The following waveforms were measured at the point of the corresponding balloon number in the schematic diagram. No.51768 2-49 2-50 No.51768...
  • Page 79 - CHASSIS EXPLODED VIEW (TOP VIEW) - CHASSIS EXPLODED VIEW (BOTTOM VIEW) - ELECTRICAL REPLACEMENT PARTS LIST - PACKING & ACCESSORY REPLACEMENT PARTS LIST USING P.W. BOARD Model TV-20F242 P.W.B ASS'Y SYSCON PCB ASSíY X-A57202B01A OPERATION PCB ASSíY X-A57202B030 MAIN PCB ASSíY X-A57202B07A CRT PCB ASSíY...

  • Page 80: Mechanical Replacement Parts List

    MECHANICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION X-A57202B720 CABINET,FRONT ASS'Y X-8117540B04 SCREW,TAPPING(B0) TRUSS 4x20 X-7220001107 SHEET,HWC X-8110630A04 SCREW,TAP TITE(P) BRAZIER 3x10 X-752WSA0209 SHIELD,CASE HEAD AMP X-8117140A24 SCREW,TAPPING(B0) PAN 4x12 X-753WSA0118 PLATE,EARTH-SYSCON X-8111J50D04 SCREW,TAPPING(A) GW22 5x40 X-712WPB0050 DOOR...
  • Page 81 MECHANICAL EXPLODED VIEW (1/2) J801 PCB110 (CRT PCB) L503 FB401 V801 PCB070 (MAIN PCB) PCB030 (OPERATION PCB) SP352 PCB250 (AV PCB) SP351...
  • Page 82 MECHANICAL EXPLODED VIEW (2/2) PCB300 (COMB PCB) TU601 PCB010 (SYSCON PCB)

  • Page 83: Chassis Replacement Parts List

    CHASSIS REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION X-85OA500022 AHC ASS'Y X-8107126A04 SCREW,TAP TITE(S) PAN 2.6x10 X-85OP200290 BELT,CAPSTAN (S) X-8107226804 SCREW,TAP TITE(S) BIND 2.6x8 X-85OP900710 LEVER,REC X-8107226604 SCREW,TAP TITE(S) BIND 2.6x6 X-85OP500083 BASE,AC HEAD X-8109126604 SCREW,TAP TITE(B) PAN 2.6x6...
  • Page 84 CHASSIS EXPLODED VIEW (TOP VIEW) M2003 UN4001 H5001 H5002 M101 PCB550 (DECK PCB ASS'Y) NOTE: Applying positions AA, AB, AC, AD and BA for CLASS PART NO. MARK the grease or oil are displayed for this section. GREASE G-555G Check if the correct grease or oil is applied for G-488M each position.
  • Page 85 CHASSIS EXPLODED VIEW (BOTTOM VIEW) M2001 NOTE: Applying positions AA, AB, AC, AD and BA for CLASS PART NO. MARK the grease or oil are displayed for this section. GREASE G-555G Check if the correct grease or oil is applied for each position.
  • Page 86 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS RESISTORS R302 X-R801R7332J 3.3K OHM 1/10W R509 X-R002T4103J 10K OHM 1/4W R303 X-R801R7272J 2.7K OHM 1/10W R511 X-R002T4102J OHM 1/4W R304 X-R801R7472J 4.7K OHM 1/10W ! R512 X-R3X28A103J R,METAL OXIDE...
  • Page 87 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS RESISTORS R677 X-R801R7335J 3.3M OHM 1/10W R1034 R903N8564J 560K OHM 1/8W R680 X-R801R7562J 5.6K OHM 1/10W R1035 R801R7330J OHM 1/10W R681 X-R801R7102J OHM 1/10W R1036 R801R7472J 4.7K OHM 1/10W R683...
  • Page 88 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION RESISTORS CAPACITORS R4068 X-R002T4473J 47K OHM 1/4W ! C407 X-E5EZF3102M 1000 UF 25V R4069 X-R801R7473J 47K OHM 1/10W C408 X-E02LT5221M 220 UF 50V R4071 X-R801R7182J 1.8K OHM 1/10W C411 X-P613T1104J CMPL...
  • Page 89 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION CAPACITORS CAPACITORS C634 X-CS0RB0414K 0.01 UF 50V B C1020 X-E50HU2100M UF 16V C635 X-E50HU2470M UF 16V C1021 X-E50HU2330M UF 16 V C636 X-CS0RB0414K 0.01 UF 50V B C1022 X-CS0RB0315K 0.1 UF 25V B...
  • Page 90 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION CAPACITORS CAPACITORS C4044 X-CS0RF0415Z 0.1 UF 50V F C5537 X-E50HU5010M UF 50V C4047 X-CS0KCH4H1J PF 50V CH C5538 X-E50HU2100M UF 16V C4048 X-CS0RB0414K 0.01 UF 50V B C5539 X-E50HU0330M UF 6.3V...
  • Page 91 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION DIODES TRANSISTORS D616 X-D1VT001330 DIODE,SILICON 1SS133T-77 ! Q802 X-TC3Q026210 TRANSISTOR,SILICON 2SC2621(D,E)-RAC D617 X-D1VT001330 DIODE,SILICON 1SS133T-77 ! Q803 X-TC3Q026210 TRANSISTOR,SILICON 2SC2621(D,E)-RAC D618 X-D1VT001330 DIODE,SILICON 1SS133T-77 ! Q810 X-TC7T1740S0 TRANSISTOR,SILICON 2SC1740SP(R,S) TP...
  • Page 92 ELECTRICAL REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION REF. NO. PART NO. DESCRIPTION COILS &TRANSFORMERS MISCELLANEOUS CD4001 CORD,JUMPER 2L061501 T401 X-045013001J TRANS,HORIZONTAL DRIVE 5013001 X-122L061501 ! T501 X-0481350524 TRANSFORMER,SWITCHING 81350524 CD4203 X-06CH01812A CORD,EIS CONNECTOR CH01812A T4001 X-031626007S COIL,BIAS OSC 1626007 CP1004 X-0697280590...

  • Page 93: Accessory Replacement Parts List

    ELECTRICAL REPLACEMENT PARTS LIST ACCESSORY REPLACEMENT PARTS LIST REF. NO. PART NO. DESCRIPTION X-076G0DY010 REMOCON RM-C393G-1H X-JB5KD500 POLYBAG X-J5500115 SERVICE STATION LIST X-J5500117 REGISTRATION CARD X-J5720201 INSTRUCTION BOOK X-J5500112 GUARANTEE CARD X-J5501202 GUARANTEE CARD X-791WHA0085 LAMIFILM,BAG X-792WHA0288 PACKAGE,TOP X-792WHA0289 PACKAGE,BOTTOM X-793WCD1294 GIFT BOX...
  • Page 94 JVC SERVICE & ENGINEERING COMPANY OF AMERICA DIVISION OF JVC AMERICAS CORP. Head office : 1700 Valley Road, Wayne, New Jersey 07470 (973)315-5000 East Coast : 10 New Maple Avenue, Pine Brook, New Jersey 07058 (973)396-1000 Midwest 705 Enterprise St. Aurora, Illinois 60504...

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