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LG LH-C6231P User Manual

LG LH-C6231P
114 pages
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DVD/CD/VCR RECEIVER
Home Cinema System
SERVICE MANUAL
MODELS: LH-C6230P/C6231P (LGEDG/LGEES/LGEPT/LGEIS)
LH-C6230S (LGEFS/STUH) LH-C6230W (LGESA/LGEGF)
LH-C6231W (LGEAP) LH-C6230X (MOSCOW)
LH-C6230Y/C6231Y (LGEPL/LGEMK)
P/N : 3829RDT033C JULY, 2003
SERVICE MANUAL MODELS : LH-C6230P/C6231P/LH-C6230S/LH-C6230W/LH-C6231W/LH-C6230X/LH-C6230Y/C6231Y
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LG LH-C6231P Specifications

General IconGeneral
BrandLG
ModelLH-C6231P
CategoryReceiver
LanguageEnglish

Summary

SECTION 1. GENERAL PART

Product Safety Servicing Guidelines

Comprehensive guidelines for safe servicing of video products, covering fire, shock, X-radiation, and implosion hazards.

Pick-Up Handling Notes

Transport and Storage

Guidelines for safely transporting and storing the pick-up unit to prevent damage.

Repair Notes

Specific precautions and procedures for repairing the pick-up, including handling laser beams and cleaning.

CD Player Repair Notes

Preparation for Repair

Essential preparations for CD player repairs, focusing on component sensitivity to static electricity.

Repair Procedures

Important steps and precautions to follow during CD player repair, including grounding and tool usage.

Servicing Precautions

General Precautions

Essential safety measures and general precautions to be followed before and during servicing.

ESD Handling

Procedures to prevent damage to ES devices from static electricity during servicing.

Cautionary Graphic Symbols

Product Specifications

General Specifications

Details on power, dimensions, mass, operating conditions, and timer.

DVD Section Specifications

Technical specifications for the DVD playback section, including laser and signal system.

VCR Section Specifications

Technical specifications for the VCR section, including head system and recording time.

Tuner Section Specifications

Technical specifications for the tuner section, covering tuning range and intermediate frequency.

Amplifier Section Specifications

Technical specifications for the amplifier section, detailing stereo and surround sound output.

Speaker Specifications

Technical specifications for the satellite and subwoofer speakers, including impedance and power.

SECTION 2. AUDIO PART

AMP Troubleshooting Guide

Troubleshooting flow chart for audio amplifier issues, guiding through checks and solutions.

SECTION 3. VCR PART

Electrical Adjustment Procedures

Detailed procedures for electrical adjustments, including servo adjustment and PG adjustment.

VCR Electrical Troubleshooting

System/Key Circuit

Auto Stop

Troubleshooting steps for the auto-stop function in the VCR system, including waveform checks.

Unstable Cassette Loading

Troubleshooting guide for issues with unstable cassette tape loading in the VCR.

Servo Circuit: PB Mode Issues

Unstable Video in PB Mode

Troubleshooting steps for unstable video playback in the VCR's servo circuit.

Drum Motor Not Running

Diagnostic steps for when the VCR's drum motor fails to operate.

Servo Circuit: Capstan Motor Issues

Capstan Motor Not Running

Troubleshooting guide for issues where the VCR's capstan motor does not run.

Servo Circuit: Key Issues

Key Buttons Not Working

Troubleshooting steps for when the VCR's key input buttons are not working.

Y/C Circuit

No Video in EE Mode

Troubleshooting steps for no video signal in EE mode, checking various circuit paths.

Y/C Circuit: Luminance Signal Issues

Y(Luminance) Signal Missing in PB Mode

Troubleshooting steps for missing luminance signal during playback.

Y/C Circuit: Color Signal Issues

C(Color) Signal Missing in PB Mode

Troubleshooting steps for missing color signal during playback.

Y/C Circuit: REC Mode Video Issues

Video Signal Missing in REC Mode

Troubleshooting steps for no video signal during recording.

Hi-Fi Circuit: EE Mode Sound Issues

No Sound in EE Mode

Troubleshooting steps for no audio output in EE mode, checking various audio circuits.

Hi-Fi Circuit: Playback Sound Issues

No Sound in Hi-Fi Playback

Troubleshooting steps for no sound during Hi-Fi playback.

Hi-Fi Circuit: Recording Issues

Cannot Record Hi-Fi Audio

Troubleshooting steps for inability to record Hi-Fi audio signals.

Tuner/IF Circuit: Picture Issues

No Picture on TV Screen

Troubleshooting steps for no picture displayed on the TV screen.

Tuner/IF Circuit: Sound Issues

No Sound

Troubleshooting steps for no sound from the tuner/IF circuit.

SECTION 5. DVD PART

DVD Electrical Troubleshooting

Troubleshooting flow chart for DVD electrical issues, starting with power and communication checks.

System Test and Debugging Waveforms

System Clock, Reset, Flash R/W Signals

Details and waveforms for system clock, reset, and flash read/write signals.

System Test and Debugging Waveforms: Serial Communication

RS232 Waveform (Downloading)

Displays RS232 waveforms during the downloading procedure.

Flash R/W Enable Signal (Downloading)

Displays flash read/write enable signals during download.

SDRAM Clock

MT1379 Main Clock (27MHz)

Shows the main clock waveform for MT1379 at 27MHz.

Tray Open/Close Signals

Tray Open/Close Waveform

Displays waveforms related to tray open and close operations.

Tray Open/Close Signals: Specific Waveforms

Tray Close Waveform

Waveforms illustrating the tray closing sequence.

Tray Open Waveform

Waveforms illustrating the tray opening sequence.

Sled Control Signals (No Disc)

(NO DISC CONDITION)

Sled control signals displayed when no disc is present.

Lens Control Signals (No Disc)

(NO DISC CONDITION)

Lens control signals displayed when no disc is present.

Laser Power Control Signals (No Disc)

(NO DISC CONDITION)

Laser power control signals when no disc is present.

Disc Type Judgement Waveform

Focus Waveform

Spindle Control Waveform (No Disc)

(NO DISC CONDITION)

Spindle control waveforms when no disc is present.

Tracking Control Signals

(System Checking)

Tracking control signals for system checking.

RF Waveform

MT1379 Audio Output (SPDIF)

MT1379 Video Output Waveform

Full Colorbar Signal (CVBS)

Displays the MT1379 video output waveform for full colorbar (CVBS).

Y Component

Displays the Y component of the MT1379 video output waveform.

MT1379 Video Output Waveform: C Component

C Component

Displays the C component of the MT1379 video output waveform.

Audio Output Form Audio DAC

Audio Related Signal

Shows waveforms related to the audio output from the DAC.

SPEAKER

Satellite Speaker

Details and exploded view for the satellite speaker model LHS-C6230T.

Passive(Sub) Woofer

Model: LHS-C6230W

Details and exploded view for the passive subwoofer model LHS-C6230W.

BLOCK DIAGRAM

Audio Schematic Diagrams

U-COM Schematic Diagram

Schematic diagram for the U-COM circuit.

Audio Schematic Diagrams: Function & Power

Function & Power Schematic Diagram

Schematic diagram for the function and power circuits.

Audio Schematic Diagrams: Main Amplifier

Main Amp Schematic Diagram

Schematic diagram for the main amplifier section.

Wiring Diagram

Audio Voltage Sheet (IC&TR)

Printed Circuit Diagram

Mainamp & Front PCB (Solder Side)

Printed circuit board layout for the main amp and front sections (solder side).

Printed Circuit Diagram: Mainamp & Front

Mainamp & Front PCB (Component Side)

Printed circuit board layout for the main amp and front sections (component side).

Printed Circuit Diagram: Function & Power

Function & Power PCB (Solder Side)

PCB layout for function and power boards (solder side).

Printed Circuit Diagram: Function & Power (Comp. Side)

Function & Power PCB (Component Side)

PCB layout for function and power boards (component side).

VCR Schematic Diagrams

System Schematic Diagram

Schematic diagram for the system of the VCR.

VCR Schematic Diagrams: Audio/Video

A(Audio)/V(Video) Schematic Diagram

Schematic diagram for audio and video circuits in the VCR.

VCR Schematic Diagrams: Power

Power Schematic Diagram

Schematic diagram of the VCR power supply section.

VCR Schematic Diagrams: Tuner/IF

TU/IF. ACSS Schematic Diagram

Schematic diagram for the Tuner/IF and ACSS circuits.

VCR Schematic Diagrams: Hi-Fi/Tuner

Hi-Fi/Tuner Schematic Diagram

Schematic diagram for the Hi-Fi and Tuner sections.

VCR Schematic Diagrams: A/V Jack

A/V Jack, SCART Schematic Diagram

Schematic diagram for the A/V jacks and SCART connection.

VCR Voltage Sheet (IC&TR)

Printed Circuit Diagrams

Tuner P.C Board

Printed circuit board layout for the tuner section.

Printed Circuit Diagrams: VCR Section

VCR P.C Board

Printed circuit board layout for the VCR section.

Printed Circuit Diagrams: VCR Section (Continued)

VCR P.C Board

Printed circuit board layout for the VCR section (continued).

DVD Part Schematic Diagrams

MPEG Schematic Diagram

Schematic diagram for the MPEG processing unit of the DVD player.

DVD Part Schematic Diagrams: Servo

Servo Schematic Diagram

Schematic diagram for the servo control system of the DVD player.

DVD Part Schematic Diagrams: Audio

Audio Schematic Diagram

Schematic diagram for the audio processing circuits of the DVD player.

DVD Part Schematic Diagrams: Interface

Interface Schematic Diagram

Schematic diagram for the interface connections of the DVD player.

Voltage Sheet (IC&TR)

Printed Circuit Diagram

DVD P.C. Board (Solder Side)

Printed circuit board layout for the DVD player (solder side).

Printed Circuit Diagram: DVD Component Side

DVD P.C. Board (Component Side)

Printed circuit board layout for the DVD player (component side).

SECTION 7. EXPLODED VIEWS

Cabinet and Main Frame

Exploded view and parts breakdown for the cabinet and main frame assembly.

SECTION 4. MECHANISM OF VCR PART

Deck Mechanism Parts Locations

Overview of VCR deck mechanism part locations, including top and bottom views.

Deck Mechanism Disassembly

Step-by-step guide for disassembling the VCR deck mechanism components.

Deck Mechanism Parts Locations: Views

Top View

Detailed illustration of VCR deck mechanism parts in the top view.

Bottom View

Detailed illustration of VCR deck mechanism parts in the bottom view.

Deck Mechanism Disassembly: Drum Assembly

1. Drum Assembly

Procedure for disassembling the drum assembly, including the drum motor.

Deck Mechanism Disassembly: Key Components

2. Plate Top

Procedure for removing the plate top assembly of the VCR deck mechanism.

3. Holder Assembly CST

Procedure for disassembling the CST holder assembly in the VCR deck.

4. Opener Door

Procedure for removing the opener door of the VCR deck mechanism.

5. Bracket Assembly L/D Motor

Procedure for disassembling the bracket assembly for the L/D motor.

6. Gear Assembly Rack F/L

Procedure for disassembling the gear assembly rack for the F/L mechanism.

7. Arm Assembly F/L

Procedure for disassembling the arm assembly for the F/L mechanism.

8. Lever Assembly S/W

Procedure for disassembling the lever assembly for the S/W switch.

Deck Mechanism Disassembly: Cleaner & Head Assemblies

9. Arm Assembly Cleaner

Procedure for disassembling the arm assembly cleaner.

10. Head F/E

Procedure for disassembling the F/E head assembly.

11. Base Assembly A/C Head

Procedure for disassembling the base assembly for the A/C head.

Deck Mechanism Disassembly: Brake & Reel Assemblies

12. Brake Assembly T

Procedure for disassembling the brake assembly T.

13. Brake Assembly RS

Procedure for disassembling the brake assembly RS.

14. Arm Assembly Tension

Procedure for disassembling the arm assembly tension mechanism.

15. Reel S / Reel T

Procedure for disassembling the reel S and reel T components.

Deck Mechanism Disassembly: Base & Lever Assemblies

16. Base Assembly P4

Procedure for disassembling the base assembly P4.

17. Opener Lid

Procedure for disassembling the opener lid.

18. Arm Assembly Pinch

Procedure for disassembling the arm assembly pinch.

19. Lever T/up / Arm T/up

Procedure for disassembling the lever T/up and arm T/up.

Deck Mechanism Disassembly: Capstan & Clutch Assemblies

20. Belt Capstan / Motor Capstan

Procedure for disassembling the belt capstan and motor capstan.

21. Lever F/R

Procedure for disassembling the lever F/R.

22. Clutch Assembly D35

Procedure for disassembling the clutch assembly D35.

23. Brake Assembly Capstan

Procedure for disassembling the brake assembly capstan.

Deck Mechanism Disassembly: Gear Assemblies

24. Gear Drive / Gear Cam

Procedure for disassembling the gear drive and gear cam.

25. Gear Sector

Procedure for disassembling the gear sector.

26. Plate Slider

Procedure for disassembling the plate slider.

27. Lever Tension

Procedure for disassembling the lever tension mechanism.

28. Lever Spring

Procedure for disassembling the lever spring.

Deck Mechanism Disassembly: P2/P3 Assemblies

29. Gear Assembly P2 / Gear Assembly P3

Procedure for disassembling gear assemblies P2 and P3.

30. Base Assembly P2 / Base Assembly P3

Procedure for disassembling base assemblies P2 and P3.

Deck Mechanism Disassembly: Loading & Tension Assemblies

31. Base Loading

Procedure for disassembling the base loading mechanism.

32. Base Tension

Procedure for disassembling the base tension mechanism.

33. Arm Assembly Idler

Procedure for disassembling the arm assembly idler.

Deck Mechanism Adjustment: Tools

Tools and Fixtures for Service

Lists necessary tools and fixtures for adjusting the VCR deck mechanism.

Deck Mechanism Adjustment: Alignment

1. Mechanism Alignment Position Check

Procedure to check and adjust the mechanism's alignment position when a tape is ejected.

Deck Mechanism Adjustment: Torque

2. Preparation for Adjustment

Steps to prepare the deck mechanism for adjustment, setting the loading state without a tape.

3. Checking Torque

Procedure for checking tape transport torque in various modes for smooth operation.

Deck Mechanism Adjustment: Roller Height

4. Guide Roller Height Adjustment

Procedure to regulate tape height for proper running along the lower drum guide line.

Deck Mechanism Adjustment: Audio/Control Head

5. Audio/Control (A/C) Head Adjustment

Procedure to ensure accurate tape passage over audio and control tracks in record/playback modes.

Deck Mechanism Adjustment: Tape Path Confirmation

5-2. Confirm Tape Passage

Steps to confirm smooth tape passage between guides and pinch roller.

5-3. Precise Azimuth Adjustment

Procedure for precise azimuth adjustment of the A/C head.

6. X-Value Adjustment

Procedure for X-value adjustment to ensure compatibility with other VCR models.

Deck Mechanism Adjustment: Drum & Tape Travel

7. Adjustment After Drum Replacement

Adjustments required after replacing the drum assembly and video heads.

8. Check Tape Travel After Reassembly

Procedure to check tape travel after reassembling the deck assembly.

8-1. Audio/RF Locking Time Check

Checks for audio and RF locking times after playback and mode changes.

8-2. Tape Curling or Jamming Check

Procedure to check for tape curling or jamming during operation.

Maintenance/Inspection Procedure: Initial Checks

1. Check Before Starting Repairs

Initial checks for cleaning and lubrication before starting VCR maintenance.

Maintenance/Inspection Procedure: General

2. Required Maintenance

Details on the precision and compatibility requirements for VCR components.

3. Scheduled Maintenance

Guidelines for periodic inspection and maintenance schedules based on usage.

5-1. Cleaning

Procedures for cleaning video heads and tape transport systems.

Maintenance/Inspection Procedure: Greasing

5-2. Greasing

Procedures for applying grease to specified locations in the VCR mechanism.

Mechanism Troubleshooting Guide: Deck Mechanism

1. Deck Mechanism: Auto Rewind/F/R Modes

Troubleshooting steps for auto rewind and F/R mode issues in the deck mechanism.

Mechanism Troubleshooting Guide: Operational Modes

C. Operational Modes Troubleshooting

Troubleshooting steps for AUTO STOP, CUE/REV modes, and pinch roller contact.

D. Cassette Loading Issues

Troubleshooting steps for cassette loading and CST IN switch issues.

Mechanism Troubleshooting Guide: Motor & Sensor Issues

E. Motor and Sensor Issues

Troubleshooting steps for tape presence sensing, motor rotation, and pulses.

Front Loading Mechanism Troubleshooting: Insertion Issues

2. Front Loading Mechanism A. Insertion

Troubleshooting for cassette insertion issues, including lever and CST switches.

Front Loading Mechanism Troubleshooting: Ejection Issues

2. Front Loading Mechanism B. Ejection

Troubleshooting for cassette ejection issues, checking motor rotation and door operation.

Front Loading Mechanism Troubleshooting: Loading Issues

C. Loading Issues

Troubleshooting for cassette loading, opener lid, and gear assembly issues.

Exploded Views: Front Loading

1. Front Loading Mechanism Section

Exploded view of the front loading mechanism section of the VCR.

Exploded Views: Moving Mechanism Part 1

2. Moving Mechanism Section(1)

Exploded view of the first part of the moving mechanism.

Exploded Views: Moving Mechanism Part 2

3. Moving Mechanism Section(2)

Exploded view of the second part of the moving mechanism.

SECTION 6 MECHANISM OF DVD PART

Deck Mechanism Parts Locations

Overview of DVD deck mechanism part locations, including top and bottom views.

Deck Mechanism Disassembly

Step-by-step guide for disassembling DVD deck mechanism components.

DVD Deck Mechanism Parts Locations

Top View (With Tray)

Detailed illustration of DVD deck mechanism parts with tray in top view.

Top View (Without Tray)

Detailed illustration of DVD deck mechanism parts without tray in top view.

Bottom View

Detailed illustration of DVD deck mechanism parts in bottom view.

DVD Deck Mechanism Disassembly: Clamp Assemblies

1. Holder Clamp

Procedure for disassembling the holder clamp assembly.

2. Tray Disc

Procedure for ejecting and removing the tray disc.

DVD Deck Mechanism Disassembly: Sled & Rubber Parts

3. Base Assembly Sled

Procedure for disassembling the base assembly sled.

4. Rubber Rear

Procedure for disassembling the rubber rear component.

DVD Deck Mechanism Disassembly: Frame & Gear Assemblies

5. Frame Assembly Up/Down

Procedure for disassembling the frame assembly up/down.

6. Belt Loading

Procedure for disassembling the belt loading mechanism.

7. Gear pulley

Procedure for disassembling the gear pulley.

8. Gear Loading

Procedure for disassembling the gear loading mechanism.

9. Guide Up/Down

Procedure for disassembling the guide up/down mechanism.

10. PWB Assembly Loading

Procedure for disassembling the PWB assembly loading.

11. Base Main

Procedure for disassembling the base main assembly.

Exploded Views: DVD Deck Mechanism

1. Deck Mechanism Exploded View

Exploded view of the DVD deck mechanism.