Zenith TVBR1342Z Service Manual
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Zenith TVBR1342Z Service Manual

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SERVICE MANUAL
Product Type:
Chassis:
Manual Series: CM152
Manual Part #: 923-03440
Model Line:
Product Year:
201 James Record Road - Huntsville, Alabama 35824-1513
Printed in U.S.A.
CN DG 5k
Color TV /VCR Combo
CC-002
C
2000
CONTENTS
General Information ...................................... 1
Servicing ..................................................... 2
Parts .......................................................... 3
Exploded views ............................................. 4
Schematics .................................................. 5
Published by Technical Publications
Zenith Electronics Corporation
May 2000
Model Series:
TVBR1342Z
TVBR1942Z
TVBR2542Z

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Summary of Contents for Zenith TVBR1342Z

  • Page 1 General Information ........1 Servicing ............. 2 Parts ............3 Exploded views ..........4 Schematics ..........5 Published by Technical Publications Zenith Electronics Corporation 201 James Record Road - Huntsville, Alabama 35824-1513 Printed in U.S.A. May 2000 CN DG 5k...
  • Page 2 When servicing this product, under no circumstances should the original design be modified or altered without permission from Zenith Electronics Corporation. All components should be replaced only with types identical to those in the original circuit and their physical location, wiring and lead dress must conform to original layout upon completion of repairs.
  • Page 3 If replacement of any of these components are deemed necessary, it a) Video Generator is important to use original Zenith replacement components. After b) HV DC meter (0 to 40kv, high Z) replacement is made, confirm proper Anode Voltage using the fol- lowing procedure.

  • Page 5: Table Of Contents

    TABLE OF CONTENTS SECTION 1 GENERAL INFO / REMOTE CONTROL 25" Control Panel Circuit ..........5-28 SPECIFICATIONS ............1-1 13/19" Main PCB Top Layout ........5-29 13/19" Main PCB Bottom Layout ........5-30 SECTION 2 SERVICING 13/19" Control Panel & Deck PCB Layout ....... 5-31 DISASSEMBLY INSTRUCTION ..........

  • Page 7: Specifications

    MAXIUM OUTPUT POWER: 1.5W (Model TVBR1342Z) 1.5W (Models TVBR1942Z) 2.5W (Models TVBR2542Z) SPEAKER: 8 ohm (Models TVBR1342Z, TVBR1942Z) 16 ohm x 2 (Models TVBR2542Z) POWER SOURCE: AC 120V, 60Hz (All Models) POWER CONSUMPTI0N: 70W (Models TVBR1342Z) 86W (Models TVBR1942Z) 120W (Models TVBR2542Z)
  • Page 8 Audio: 300mV, 1k ohm unbalanced WEIGHT: 27.6 lbs. (Models TVBR1342Z) 48.7 lbs. (Models TVBR1942Z) 67.1 lbs. (Models TVBR2542Z) DIMENSION: 14.48”(W) x 14.8”(D) x 15.28”(H) (Model TVBR1342Z) 19.56”(W) x 18.5”(D) x 19.18”(H) (Model TVBR1942Z) 24.72”(W) x 19.8”(D) x 24.2”(H) (Models TVBR2542Z) CM152 GENERAL INFO...

  • Page 9: Removal Of Mechanical Parts And Pc Boards

    TVBR 13/1942Z DISASSEMBLY INSTRUCTIONS 1. REMOVAL OF MECHANICAL PARTS AND P.C. BOARDS 1-1: BACK CABINET (Refer to Fig. 1-1) 1-3: VCR BLOCK (Refer to Fig. 1-3) Remove the 6 screws 1. Remove the 2 screws 1. Remove the screw 2 which is used for holding the Back Disconnect the following connectors: Cabinet.
  • Page 10 TVBR 13/1942Z DISASSEMBLY INSTRUCTIONS 1-4: DECK SHIELD PLATE, DECK CHASSIS AND 1-5: SYSCON PCB (Refer to Fig. 1-5) BOTTOM SHIELD (Refer to Fig. 1-4) Remove the screw 1. Remove the 3 screws 1. Remove the Syscon PCB in the direction of arrow. Remove the 3 screws 2.
  • Page 11 TVBR2542Z 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) (CP303, CP401, CP502, CP4201 and CP4202). Remove the 6 screws 1.
  • Page 12 TVBR2542Z DISASSEMBLY INSTRUCTIONS 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 screw 2.
  • Page 13 TVBR13/19/2542Z DISASSEMBLY INSTRUCTIONS 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.
  • Page 14 TVBR13/19/2542Z DISASSEMBLY INSTRUCTIONS 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 15 DISASSEMBLY INSTRUCTIONS 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 16 DISASSEMBLY INSTRUCTIONS 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 17 DISASSEMBLY INSTRUCTIONS 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.

  • Page 18: Removal Of Anode Cap

    DISASSEMBLY INSTRUCTIONS 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 19 DISASSEMBLY INSTRUCTIONS 4. Insert one end of the Anode Support into the anode button, then the other as shown in Fig. 3-5. Support Fig. 3-5 Confirm that the Support is securely connected. Put the Rubber Cap on without moving any parts. 4.

  • Page 20: Key Abbreviations

    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 21 KEY TO ABBREVIATIONS SYNC Synchronization SYNC SEP Sync Separator, Separation Transistor TRAC Tracking TRACK PB Track 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...

  • Page 22: Service Mode

    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 for at least 5 seconds till actual clock time is lost. Then press and hold Vol (-) button of main unit and remote controle simultaneously.
  • Page 23 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 24 PREVENTIVE CHECKS AND SERVICE INTERVALS 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 25: Note For Replacing Of Memory Ic

    TABLE 1. NOTE: Initial Data setting will not be possible if clock has been set. To reset clock, either unplug AC cord and allow at least 5 seconds before Power On. TVBR1342Z ADDRESS DATA...
  • Page 26 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 27 SERVICING FIXTURES AND TOOLS (For 2 heads model) 868-10004 Adapter 868-10008 Reel Disk Height 868-10007 Master Plan VHS Alignment Tape 868-10005 Dial Torque Gauge Adjustment Jig 940-00053 (VN S-LI6 ) (10~90gfïcm) 940-00054 (VN S-CO1 ) 868-10006 (60~600gfïcm) 940-00055 (VN S-LI6 H) 940-00055 (VN S-X6 ) Tentelometer...
  • Page 28 PREPARATION FOR SERVICING (TVBR2542 Only) How to use the Servicing Fixture Unplug the connector CP303, CP4201 and CP4202, then remove the TV/VCR Block from the set. Unplug the connector C810, CP820 and CP850, then remove the Main PCB from the VCR Block. Connect as shown in the below figure using the Service Fixture.
  • Page 29 MECHANICAL ADJUSTMENTS 1-2: CONFIRMATION AND ADJUSTMENT OF TENSION 1. CONFIRMATION AND ADJUSTMENT POST POSITION Read the following NOTES before starting work. Set to the PLAY mode. ï 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 30 MECHANICAL ADJUSTMENTS 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 868-10006 and Adapter 868-10004 factory.
  • Page 31 MECHANICAL ADJUSTMENTS 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 32 MECHANICAL ADJUSTMENTS 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 2-24 CM152 SERVICI NG...

  • Page 33: Electrical Adjustments

    ELECTRICAL ADJUSTMENTS 1. BEFORE MAKING ELECTRICAL 2. BASIC ADJUSTMENTS ADJUSTMENTS (VCR SECTION) Read and perform these adjustments when repairing the 2-1: PG SHIFTER circuits or replacing electrical parts or PCB assemblies. Connect CH-1 on the oscilloscope to TP1002 and CH-2 to pin 4 of CP1003, (TP4201 on TVBR2542Z) CAUTION Playback the alignment tape.
  • Page 34 ELECTRICAL ADJUSTMENTS 2-3: RF AGC 2-7: FOCUS Receive an 70dB monoscope pattern. Receive the monoscope pattern. On TVBR13/1942Z connect the digital voltmeter between Turn the Focus Volume fully counterclockwise once. pin 5 of CP351 and pin 1 (GND) of CP351. Adjust the Focus Volume until picture is distinct.
  • Page 35 ELECTRICAL ADJUSTMENTS 2-14: SUB COLOR (TVBR13/1942Z Only) 2-12: SUB CONTRAST (For TVBR2542Z Only) Receive the color bar pattern. (RF Input) Activate the adjustment mode display of Fig. 1-1 and Connect the synchro scope to TP801. press the channel button (14) on the remote control to Activate the adjustment mode display of Fig.
  • Page 36 TVBR 13/1942Z ELECTRICAL ADJUSTMENTS 3. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE TP1001 CP1003 TP1002 TP4001 FH503 VR502 TU001 FB401 CP351 FOCUS VOLUME SCREEN VOLUME SYSCON TP801 TP803 J801 2-28 CM152 SERVICI NG...
  • Page 37 TVBR 2542Z ELECTRICAL ADJUSTMENTS 3. ELECTRICAL ADJUSTMENT PARTS LOCATION GUIDE (VCR SECTION) TP1002 TP1001 TP4001 CP602 TU601 TP4201 J4202 J4201 SYSCON PCB 2-29 CM152 SERVICING...
  • Page 38 TVBR 2542ZELECTRICAL ADJUSTMENTS (TV SECTION) J801 CRT PCB VR502 T501 FB401 FOCUS VOLUME SCREEN VOLUME MAIN PCB 2-30 CM152 SERVICING...
  • Page 39 ELECTRICAL ADJUSTMENTS 4-3: STATIC CONVERGENCE 4. PURITY AND 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.
  • Page 41 Component parts list. Notes: The following information is for Models in and out of warranty. MODEL INDENTIFIER TVBR1342Z TVBR1942Z To Order Parts: voice 1-888-3-ZENITH TVBR2542Z 1-888-6-ZENITH Address: ZENITH NATIONAL PARTS SALES AND DISTRIBUTION CENTER P O Box 240007 Huntsville, AL 35824-6407...

  • Page 42: Component Parts List

    COMPONENT PARTS COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC — - 206-03641 INSTRUCTION BOOK SCREW, TAP TITE (P) BRAZIER 857-10351 CABINET, FRONT ASS’Y SCREW, TAPPING (B0) TRUSS...
  • Page 43 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC 917-10067 P5-3 ARM ASS’Y(S) SPRING, PACK 866-10023 PINCH ROLLER BLOCK 812-10096 BRACKET, TOP 917-10046...
  • Page 44 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC C1024 822-10400 CAP, CERAMIC 0.1 UF 25V C301 822-10496 CAP, CERAMIC 0.0047UF 50V C1024 822-10444...
  • Page 45 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC C4002 822-10422 CAP, CERAMIC 0.01 UF 50V C4052 822-10442 CAP, CERAMIC 0.01 UF 50V C4003 822-10443...
  • Page 46 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC C506 822-11145 CAP, METAL POLY 0.1 UF 250V C617 822-10422 CAP, CERAMIC 0.01 UF 50V C507...
  • Page 47 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC C665 822-11457 CAP, ALUMI ELECTRO 100 UF 16V CD4001 811-10027 CORD, JUMPER 2L061501 C666...
  • Page 48 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC D1003 903-10398 LED SID1050CM D601 903-10390 DIODE, SILICON 1SS133T-77 D1004 903-10399 DIODE, ZENER RD12FB-T7...
  • Page 49 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC IC352 905-10472 IC, AN7523 L605 820-10626 COIL, 1 UH IC401 905-10591 IC, LA78040...
  • Page 50 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC Q406 921-10261 TRANSISTOR, SILICON 2SD2627LS-CBC11 R1004 863-10451 RESISTOR, CARBON 1K OHM 1/10W Q406 921-10271 TRANSISTOR, SILICON 2SD2335(LS)
  • Page 51 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC R1043 863-11472 RESISTOR, CARBON 22K OHM 1/4W R417 863-11569 RESISTOR, CARBON 330 OHM 1/2W R1044 863-10483...
  • Page 52 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC R4004 863-11601 RESISTOR, CARBON 2.7K OHM 1/10W R4039 863-11509 RESISTOR, CARBON 33K OHM 1/8W R4005 863-10410...
  • Page 53 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC R4205 863-10451 RESISTOR, CARBON 1K OHM 1/10W R603 863-11501 RESISTOR, CARBON 220 OHM 1/8W R4206 863-10495...
  • Page 54 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC R639 863-11648 RESISTOR, CARBON 1.5K OHM 1/4W R674 863-10462 RESISTOR, CARBON 1.8K OHM 1/10W R639 863-11498...
  • Page 55 COMPONENT PARTS LIST SEE REFERENCE CHART ON PAGE 1 NOTE: This list will enable you to easily determine the parts used on each Model, Chassis, or Assembly. PART# DESC PART# DESC RY501 995-10014 RELAY SDT-S-112LMR SP301 849-10038 SPEAKER P-300S-1 SP302 849-10038 SPEAKER P-300S-1 SP351...
  • Page 57 TVBR 13/1942Z MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB) L503 V801 PCB030 (OPERATION PCB) SP351 (TVBR1342Z Only) CM152 EXPLODED VIEW...
  • Page 58 TVBR2542Z MECHANICAL EXPLODED VIEW J801 PCB110 (CRT PCB) L503 V801 PCB070 MAIN PCB SP301 105 206 PCB030 (OPERATION PCB) SP302 CM152 EXPLODED VIEW...
  • Page 59 TVBR 13/1942Z MECHANICAL EXPLODED VIEW TU601 FB401 PCB010 (SYSCON PCB) CM152 EXPLODED VIEW...
  • Page 60 TVBR2542Z MECHANICAL EXPLODED VIEW PCB140 (IICBUS PCB) TU601 PCB010 (SYSCON PCB) CM152 EXPLODED VIEW...
  • Page 61 TVBR 13/19/2542Z UPPER DECK EXPLODED VIEW M2003 UN4001 H5001 H5002 M101 PCB550 (DECK PCB ASS'Y) CM152 EXPLODED VIEW...
  • Page 62 TVBR 13/19/2542Z LOWER DECK EXPLODED VIEW M2001 CM152 EXPLODED VIEW...

  • Page 65: 13/19" Interconnect Diagram

    SECTION 6 13/19" Interconnect Diagram CONTROL PANEL ASSEMBLY J351 FRONT AV JACK J701 OS753 This schematic DECK MECHANICAL HALL MAIN ROTOR SENSOR COIL MAGNET FG SENSOR applies to the Vout ASSEMBLY SPEAKER CD352 following models M2001 SP + TM101 only: SP - TVBR1342 SP351...

  • Page 66: 13/19" Main Micro Block Diagram

    13/19" Main Micro Block Diagram SW1001 TIMER SYSCON MICON IC IC1001 OEC7043A SYSTEM RESET IC RESET-L 3 OUT IC1002 TAB SW PST600H POWER FAIL (DC) AT + 5.6V POWER_FAIL_L MSSEN-A P. CON + 5V X-OUT(12MHz) Q1023 MS_SEN A X1001 J701 Q1009 12MHz AUDIO L...

  • Page 67: 13/19" Audio Block Diagram

    13/19" Audio Block Diagram V. OUTPUT IC401 LA78040 MICON/ IN/OUT/ THERMAL OPERATION/ PROTECTION Q602, Q603 Q606 DECK REG. P. CON+8V AT+5V REG. AT+25V PUMP Q604, Q605 TU_AUDIO AT+5V Y/C/AUDIO/ REG. TU_VIDEO HEAD AMP Y/C_AUDIO CHROMA_VIDEO Q405 Q406 CHROMA IC601 M61203BFP H-DRIVE H.

  • Page 68: 13/19" Video Block Diagram

    13/19" Video Block Diagram X4001 3.579545MHz Y/C/AUDIO/CCD/ Q4009 HEAD AMP IC BUFFER IC4001 LA71067M-MPB PULL SP/LP/EP-H VX01 MICON/IN/OUT/ This schematic TIMMING CLAMP INPUT_SEL DRIVER OPERATION/ applies to the TRICK_PB-H/EE-H following models H.SW DECK DETAL only: FM-EQ EMPHA DOC_XO_CTL TVBR1342 TVBR1942 CLAMP CONV C-LPF...

  • Page 69: 25" Interconnect Diagram

    25" Interconnect Diagram COMMAND TRANSMITTER CONTROL PANEL ASSEMBLY TM101 OS753 FROM TE9962 TM101 OS753 FRONT AV JACK J701_1 HALL MAIN ROTOR Vout SENSOR COIL MAGNET FG SENSOR CD613 CP611 B.OUT B.OUT AGC_M AGC_M IIC_OFF IIC_OFF L001 HALL HALL L002 SWITCH LOGIC CP1004 MOTOR_GND...

  • Page 70: 25" Main Ic Block Diagram

    25" Main IC Block Diagram X4001 3.579545MHz Q4009 BUFFER Y/C/AUDIO/CCD/HEAD AMP IC IC4001 LA71067M-MPB This schematic PULL SP/LP/EP-H VX01 applies to the MICON/ following model TIMMING DRIVER CLAMP INPUT_SEL OPERATION/ only: DECK TRICK_PB-H/EE-H H.SW TVBR2542 DETAL EMPHA FM-EQ DOC_XO_CTL CLAMP CONV C-LPF Y-LPF...

  • Page 71: 25" Audio Ic Block Diagram

    25" Audio IC Block Diagram MICON/ V. OUTPUT IC OPERATION/ THERMAL IC401 DECK PROTECTION Q610, Q611 Q606 LA78041 REG. P. CON + 8V AT + 5V TRANSISTOR AT + 13V PUMP Q602, Q603 Q601 TU_AUDIO Y/C/AUDIO/ AT + 5V BUFFER TU_VIDEO Q612 HEAD AMP/...

  • Page 72: 25" Video Ic Block Diagram

    25" Video IC Block Diagram SW1001 TIMER SYSCON MICON IC IC1001 OEC7043A SYSTEM RESET IC RESET-L IC1002 TAB SW PST600H POWER FAIL AT + 5V POWER_FAIL_L MSSEN-A P. CON + 5V X-OUT (12MHz) Q1006 MS_SEN A X1001 J701 Q1009 12MHz AUDIO L X-IN (12MHz) FRONT_VIDEO...

  • Page 73: 13/19" Primary Power Circuit

    13/19" Primary Power Circuit 5A 125V 2.5A 250V 4A 125V FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, CAUTION: REPLACE ONLY WITH THE SAME TYPE FUSE 5A 125V (F501,ICP501,ICP502,ICP503),2.5A 250V(F502), AND 4A 125V(ICP505). D516 RELAY DRIVE 1SS133 Q504 2SC1815Y R515 DEGAUSS_H 13 REC/PB 10K 1/4W TO Y/C/A/H.AMP 5V 0.1ms/div...

  • Page 74: 13/19" Deflection Circuit

    13/19" Deflection Circuit V.OUTPUT IC IC401 LA78040 THERMAL PROTECTION This schematic PUMP UP applies to the following models HORIZONTAL SIGNAL only: 25.9 12.5 26.3 DRIVER VERTICAL SIGNAL TVBR1342 Q402 2SB892 TVBR1942 26.0 26.0 25.0 TO DY CP401 B05B-DVS 15 0.5V 5ms/div R401 W857 W837...

  • Page 75: 13/19" Main Microprocessor Circuit

    13/19" Main Microprocessor Circuit FROM/TO TV POWER DEGAUSS_H SERVICE R1032 TP1001 POWER_FAIL C1041 P.CON+5V TO SHEET 9 C1044 0.1 uF AT+12V MOTOR_GND 220P pF C1034 C1045 TV_POWER_H 0.1 uF FROM/TO HEAD AMP R1029 220P pF C1035 H.SW 4.7K 200P pF DOC_XO_CTL REC/EE/PB SP/LP/EP-H...

  • Page 76: 13/19" Chroma Circuit

    13/19" Chroma Circuit 11.0 HORIZONTAL SIGNAL REG. R632 FROM/TO MICON Q606 220 2W VERTICAL SIGNAL AT+5V REG. TUNER VIDEO SIGNAL 2SD863F Q603 AT+5V 2SC2120Y LUMINANCE SIGNAL AT+5V_BACKUP R.SIGNAL REG. REG. REG. Q605 Q602 Q604 OSD_R 2SD400E AUDIO SIGNAL(REC) G.SIGNAL 2SC2120Y 2SD400E OSD_G PLAYBACK VIDEO SIGNAL...

  • Page 77: 13/19" Head Amp Circuit

    13/19" Head Amp Circuit This SCHEMATIC applies to the L4002 following models TRICK PB SWITpF 100uH only: Q4011 0305 TVBR1342 DTC144EuF TVBR1942 L4008 W836 W896 100uH 0305 FROM TV POWER W826 TO SHEET 9 P.CON+5V R4053 FROM/TO IN/OUT 1 REC/PB 6.8K FRONT_AUDIO R4070...

  • Page 78: 13/19" Audio Amp Circuit

    13/19" Audio Amp Circuit FROM/TO IN/OUT SP_OUT SOUND+ TO SHEET 17 SOUND_GND This schematic (S802) applies to the following models only: FROM MICRO TVBR1342 TVBR1942 TV_A_MUTE TO SHEET 11 TV_POWER_H FROM CHROMA TO SHEET 12 AUDIO_OUT SOUND AMP IC IC351 AN7511 AUDIO SIGNAL(REC) R359...

  • Page 79: 13/19" Crt Circuit

    13/19" CRT Circuit TP801 BLUE AMP R802 Q804_1 132.5 2SC4217 R807 This schematic 2.7K 1/4W applies to the following models only: TVBR1342 TVBR1942 104.1 132.5 132.8 FROM CHROMAF CP851B (CP851A) J801 51048-1000 R811 CUT_OFF 4.7K CUT OFF TP802 G.OUT G.OUT 19 20.0V 20µs/div B.OUT B.OUT...

  • Page 80: 13/19" Deck Circuit

    13/19" Deck Circuit This schematic applies to the following models only: TVBR1342 TVBR1942 LOADING MOTOR M101 S105 BOT SENSOR S106 Q101 RPT-38PB113 S101 S102 S103 S104 FROM/TO SYSCON/SERVO CP101 52044-0445 LDM+ LDM- TO SHEET 11 CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE SYMBOL 5-16 P/L = See parts list for part description PROV = Provisional...

  • Page 81: 13/19" Input/Output Circuit

    13/19" Input/Output Circuit TO SHEET 18 TO SHEET 18 This schematic applies to the following models only: TVBR1342 TVBR1942 PLAYBACK VIDEO SIGNAL TUNER VIDEO SIGNAL AUDIO SIGNAL(REC) FROM/TO AUDIO AMP AUDIO SIGNAL(PB) SOUND_GND SOUND+ TO SHEET 14 SP_OUT FROM CHROMA AT+5V INT-MONI TO SHEET 12...

  • Page 82: 13/19" Control Panel Circuit

    13/19" Control Panel Circuit W802 OS753 PIC-28143TH5 Vout R778 R771 R772 R773 R774 1.5K 2.7K 5.6K R775 R776 R777 1.5K FROM/TO IN/OUT CD757 (CP757) CH2A020A REMOCON IN TO SHEET 17 HEADPHONE JACK AT+5V J351 POWER ON L HSJ2630-010070 W812 KEY A L005 HF57T18.5*10*10 T-REC LED...

  • Page 83: 25" Primary Power Circuit

    25" Primary Power Circuit DEGAUSS_H FROM/TO DEFLECTION RELAY DRIVE SOUND+B Q504 D516 2SC1815Y TV.POWER_H 6.3A 125V 2.5A 125V 1SS133 TO SHEET 20 DEGAUSS_H CAUTION: FOR CONTINUED PROTECTION AGAINST FIRE HAZARD, REPLACE ONLY WITH THE SAME TYPE FUSE P.CON+111V 5A 125V(ICP503) ,6.3A 125V(F501) ,2.5A 125V(F502) POWER_FAIL...

  • Page 84: 25" Deflection Circuit

    25” Deflection Circuit V.OUTPUT IC IC401 LA78041 THERMAL PROTECTION This schematic applies to the PUMP UP TO DY DY801_1 following model 7M062505 CP401_1 only: TS-80P-04-V1 25.5 12.9 24.8 TVBR2542 FROM/TO CHROMA CP820_1 (CP601) 8283_1312_00_000 SOUND+B SOUND_GND H.OUT 0.5V 5ms/div V.FEEDBACK C412 V.OUT 500V...

  • Page 85: 25" Main Micro Circuit

    25" Main Micro Circuit SERVICE TP1001 FROM/TO POWER JWF-50K-1 R1032 FROM/TO HEAD AMP P.CON+5V C1041 ENV_DET AT+12V CTL+ TO SHEET 19 AT+5V[BACKUP] W867 CTL- AT+5V[UCON] C_ROTARY MOTOR_GND DUMMY_V.SYNC R1029 4.7K W808 5 REC/PB COMP C1034 VCR_A_MUTE R1044 2V 20µs/div V.REC_ST_H TO SHEET 23 3.3K C1035...

  • Page 86: 25" Chroma Circuit

    25" Chroma Circuit FROM/TO MICRO IIC_OFF DEGAUSS_H POWER_FAIL[DC] HORIZONTAL SIGNAL TUNER VIDEO SIGNAL OSD_R VERTICAL SIGNAL OSD_G R.SIGNAL OSD_B LUMINANCE SIGNAL OSD_BLK L608 TO SHEET 21 G.SIGNAL AUDIO SIGNAL (REC) 100uH B.SIGNAL AFT_M AUDIO SIGNAL (PB) TU_VIDEO VCR_POWER_H L610 PLAYBACK VIDEO SIGNAL R620 CF604 100uH...

  • Page 87: 25" Head Amp Circuit

    25" Head Amp Circuit FROM POWER TO SHEET 19 P.CON+5V FROM/TO IN/OUT L4002 FRONT_A_IN_L 100uH 0305 FRONT_VIDEO_IN REAR_A_IN_R REAR_VIDEO_IN TO SHEET 27 L4008 SD_VIDEO W836 Y/C_AUDIO 100uH 0305 This schematic applies to the W896 following model only: TVBR2542 1 REC/PB 0.5V 20µs/div PLAYBACK VIDEO SIGNAL TP4001...

  • Page 88: 25" Audio Amp Circuit

    25" Audio Amp Circuit SOUND AMP IC IC352 AN7523 W811 HS352 763WAA0014 W884 FROM/TO IN/OUT C350 SOUND_L+ R356 1/4W TO SHEET 27 SP_OUT_L SOUND_GND CD303 SPEAKER CP303 CH14399A SP301_3 TID-X04P-Z1BK W909 P-300S-1 SP_OUT_L+ 16_OHM 2.5W FROM CHROMA W908 SOUND_L- B301 SPEAKER SOUND_R- SOUND+B...

  • Page 89: 25" Crt Circuit

    25" CRT Circuit TP804 R828 2.7K 1/4W RED AMP Q801 123.5 2SC4075-YAC This schematic W825 19 20.0V 20µs/div applies to the following model R810 only: C810 TVBR2542 FROM CHROMA CP805 (CD850) J801 P/L 8283_0512_00_000 TP805 R829 108.3 R.SIGNAL 2.7K 1/4W CUT_OFF 117.2 G.SIGNAL...

  • Page 90: 25" Deck Circuit

    25" Deck Circuit LOADING MOTOR M101 S105 BOT SENSOR Q101 S106 RPT-38PB113 S101 S102 S103 S104 FROM/TO MICRO CP101 52044-0445 This schematic LDM+ applies to the LDM- following model TO SHEET 21 only: TVBR2542 CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE SYMBOL 5-26 P/L = See parts list for part description PROV = Provisional...

  • Page 91: 25" Input/Output Circuit

    25" Input/Output Circuit TO SHEET 28 TO SHEET 28 PLAYBACK VIDEO SIGNAL TUNER VIDEO SIGNAL AUDIO SIGNAL(REC) AUDIO SIGNAL(PB) LED SW Q4205 DTC114EKA T-REC LED SW Q4206 DTC114EKA TV POWER LED SW TO PLATE DECK SILDE Q4204 DTC114EKA CC4201 CC4202 TP-1S-05 TP-1S-05 W892...
  • Page 92 25" Control Panel Circuit W802 OS753 PIC-28143TH5 Vout R778 R771 R772 R773 R774 1.5K 2.7K 5.6K R775 R776 R777 1.5K FROM/TO IN/OUT CD757 CH2A014A REMOCON_OUT AT+5V TO SHEET 27 POWER_ON_L KEY-A L001 T-REC_LED TUNER VIDEO SIGNAL HF57T18.5*10*10 REC_LED AUDIO SIGNAL KEY-B This schematic applies to the...
  • Page 93 13/19" Main PCB Top Layout CRITICAL SAFETY COMPONENTS ARE IDENTIFIED BY THE SYMBOL 5-29 P/L = See parts list for part description PROV = Provisional TVBR2000 SHEET 29 REPLACE ONLY WITH PART NUMBERS SPECIFIED.
  • Page 94 13/19" Main PCB Bottom Layout TO SHIELD COVER H/AMP S009 S008 C1024 C1033 C1005 C4204 R352 C301 R4201 R4053 Q4204 Q1008 Q1007 W801 C353 Q612 C617 C4083 Q4011 R4014 C4080 R4060 C4028 C4036 C4044 R1046 C4055 R4046 Q4009 R1047 R4057 C4032 C1042 C4053...
  • Page 95 13/19" Control Panel & Deck PCB Layout CONTROL PANEL C752 C752 R351_1 R351_1 R754 R754 R771 R771 W816 W816 C751 C751 SW792 SW792 J351 J351 SW798 SW798 C779 C779 R761 R761 D791 D791 C781 C781 SW794 SW794 R777 R777 R776 R776 C755_1 C755_1...
  • Page 96 25" Main PCB Layout CP820_1 C405 W012 R509 TP806 R414 Q512 W044 W052 C812 IC401 HS401 R413 CP810_1 C537 W832 R508 W050 R830 R821 TP804 W038 W804 R811 C516 CP506 W008 CP505 W015 Q801 R810 W019 C810 W848 W859 C403 C527 R817 D508...
  • Page 97 25" System Control PCB Top Layout CC4202 W166 W840 CP4202_1 CP303 HS352 R356 W234 IC352 R4070 W059 W233 SW1001 C355 W050 W250 W179 W822 W176 R1002 W896 W064 CP601 W243 L4001 W063 W006 W125 W005 L4002 C4026 W004 CF604 C4076 W172 IC1099 W235...
  • Page 98 25" System Control PCB Bottom Layout Q4204 Q1006 Q4205 Q4206 D4205 W824 R1008 Q1002 Q4210 W843 C1006 R1083 Q4212 Q1004 C4209 Q612 R621 R4213_1 C1027 R624 C1025 C1028 C1076_1 R1054 C1065 C647 Q608 R1053 R609 C1017 R1020 R635 R1051 R660 IC1001 R1035 IC601...

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