This document is a service manual for the Toshiba D-VR7KC DVD Video Recorder/Video Cassette Recorder. It provides comprehensive information for servicing, maintenance, and repair of the device, including technical specifications, disassembly instructions, electrical adjustments, troubleshooting, and parts lists.
Function Description
The Toshiba D-VR7KC is a dual-format home entertainment device, combining a DVD Video Recorder with a Video Cassette Recorder (VCR). This allows users to record and play back content on both DVD discs and VHS tapes. The device supports various DVD recording formats, including DVD-RW (Rewritable), DVD-R (Recordable), DVD+RW (Rewritable), and DVD+R (Recordable). It also features a tuner for recording television broadcasts. The integration of both DVD and VCR functionalities provides versatility for users with mixed media collections, enabling tasks such as dubbing content between formats. The device is designed to handle both video and audio signals, offering multiple input and output options for connectivity with other home theater components.
Important Technical Specifications
General:
- Video Heads: Four heads
- Power Requirements: AC 120 V, 60 Hz
- Power Consumption: 30 W (standby: 3.3 W)
- Weight: 9.5 lbs (4.3 kg)
- Dimensions (width x height x depth): 17.1" x 4.2" x 10.6" (435 x 99.5 x 268 mm)
- Operating Temperature: 41°F to 104°F (5°C to 40°C)
- Operating Humidity: Less than 80% (no condensation)
- TV System: NTSC-M (TV standard)
Recording (DVD):
- Recording Format: VR (video recording) format, Video format
- Recording Disc: DVD-Rewritable/-Recordable, DVD+Rewritable/+Recordable
Recording (VCR):
- Sampling Frequency: 13.5 MHz
- Compression Format: MPEG2
Audio Recording Format:
- Sampling Frequency: 48 kHz
- Compression Format: Dolby Digital/LPCM (XP Recording mode only)
Tuner:
- Tuning System: Channel frequency synthesized tuning system
- Channel Coverage (NTSC): VHF 2-13, UHF 14-69, CATV A-W, A-5-W-84, A-5-A1, SA
Input / Output:
- VHF/UHF Antenna Input/Output Terminal: VHF/UHF 75Ω
- Video Input: Input 1 (rear), 2 (front) - 1 Vp-p, 75Ω (RCA jack)
- Video Output: Output 1 (rear) - 1 Vp-p, 75Ω (RCA jack)
- S-Video Input: Input 1 (rear) - Y: 1 Vp-p, 75Ω, C: 286 mVp-p, 75Ω (4-pin mini DIN)
- S-Video Output: Output 1 (rear) - Y: 1 Vp-p, 75Ω, C: 286 mVp-p, 75Ω (4-pin mini DIN)
- Component Video Output: Output 1 (rear) - Y: 1 Vp-p, 75Ω, PB/CB, PR/CR: 0.7 Vp-p, 75Ω (RCA jacks)
- HDMI Output: HDMI jack
- Audio Input: Input 1 (rear), 2 (front) L/R - 2 Vrms, 22 kΩ input impedance (RCA jacks)
- Audio Output: Output 1 L/R (rear) - 2 Vrms, 1 kΩ output impedance (RCA jacks)
- Digital Audio Output: Output 1 (rear) COAXIAL - 500 mVp-p, 75Ω (RCA jack)
Usage Features
The D-VR7KC offers a range of features for convenient use:
- Dual Recording/Playback: Seamlessly switch between DVD and VCR modes for recording and playback.
- Timer Programming: Allows users to schedule recordings of TV programs. The remote control includes a "TIMER PROG." button for this function.
- Instant Skip: A dedicated "INSTANT SKIP" button on the remote control enables quick navigation through recorded content.
- Dubbing Functionality: The device supports dubbing from VCR to DVD and vice versa, facilitating media conversion. A "DUBBING" button is available on the remote control.
- Multiple Video Outputs: Provides Composite, S-Video, Component, and HDMI outputs for compatibility with various display devices, ensuring optimal picture quality based on the display's capabilities.
- Digital Audio Output: Includes a coaxial digital audio output for connecting to compatible audio receivers, supporting high-quality sound.
- Front Panel Inputs: Features convenient front-panel video and audio inputs for easy connection of external devices like camcorders or gaming consoles.
- Remote Control: A comprehensive remote control unit (SE-R0297) provides access to all functions, including power, input selection, channel control, playback controls (play, pause, stop, FWD, REV, skip), recording, and menu navigation.
- On-Screen Display (OSD): The device utilizes an on-screen display for menus, settings, and error messages, enhancing user interaction.
- VFD (Vacuum Fluorescent Display): A front panel VFD provides essential information such as recording mode, elapsed time, and error codes.
Maintenance Features
The service manual outlines several key maintenance procedures to ensure the longevity and proper functioning of the D-VR7KC:
- Green Product Procurement: Toshiba emphasizes the use of "green parts" and lead-free solder for repairs, aligning with environmental directives (WEEE & RoHS). This ensures that replacement parts have low environmental impact.
- Lead-Free Solder Requirement: All servicing and repair must use lead-free solder. A warning explicitly states, "DO NOT USE LEAD BASED SOLDER TO REPAIR THIS PRODUCT!" This is crucial due to the higher melting temperature of lead-free solder, which requires specific soldering techniques to prevent damage to components.
- Laser Beam Safety Precautions: Detailed instructions are provided for handling the DVD pickup unit, emphasizing the danger of direct exposure to the laser beam and recommending a safe distance of at least 30 cm from the pickup lens.
- Important Safety Precautions: The manual highlights critical safety-related parts (marked with "!") that must be replaced only with specified part numbers to maintain safety and compliance with spurious radiation regulations.
- Electrostatic Discharge (ESD) Protection: Instructions for handling semiconductors include wearing a grounding band and using a conductive workbench to prevent damage from static electricity.
- Service Mode Entry: Specific steps are provided to enter the service mode, which is essential for certain adjustments and troubleshooting. This involves connecting a test point (TP502) to GND to disable optical sensors, preventing tape damage during servicing.
- Initialization Procedure: Instructions for initializing the DVD recorder and VCR to factory default settings are included, useful for resolving software-related issues.
- Firmware Renewal Mode: A detailed procedure for updating the device's firmware is provided, including steps for entering the renewal mode, loading the update disc, and selecting the firmware version.
- Troubleshooting Flowcharts: Extensive flowcharts are included for diagnosing common issues related to the power supply, DVD section, and VCR section, guiding technicians through logical steps to identify and resolve problems.
- Electrical Adjustment Instructions: Procedures for electrical adjustments, such as Head Switching Position Adjustment, are detailed, along with required test equipment (oscilloscope, alignment tape) and connection diagrams.
- Cabinet Disassembly Instructions: A comprehensive flowchart and detailed steps are provided for disassembling the cabinet, allowing access to internal components for repair. Caution is advised for fragile locking tabs.
- Manual Eject Procedure: Instructions for manually ejecting a disc in case of mechanism failure are included, involving specific steps to rotate a gear and pull out the tray.
- Function Indicator Symbols: A list of error messages and corresponding symbols displayed on the TV screen and VFD is provided for both VCR and DVD sections, aiding in quick diagnosis of malfunctions.
- Standard Maintenance Schedule: A chart outlines periodic service schedules for various deck components (e.g., Cylinder Assembly, Loading Motor Assembly, Capstan Motor, FE Head), specifying cleaning and replacement intervals (e.g., 1,000 h, 2,000 h, 3,000 h, 4,000 h).
- Cleaning Procedures: Detailed instructions for cleaning the Video Head and ACE Head using specific materials (head cleaning stick, cotton swab, 90% ethyl alcohol) are provided, with warnings against vertical cleaning to prevent damage.
- Service Fixture and Tools: A list of specialized tools and fixtures required for mechanical alignment and adjustments is provided, including alignment tapes, screwdrivers, and a mirror.
- Mechanical Alignment Procedures: Instructions for aligning tape path components (Guide Rollers, ACE Head, Audio/Control/Erase Head) are included, with flowcharts for tape traveling alignment and detailed steps for X Value and Envelope Waveform adjustments.
- Deck Disassembly/Assembly Procedures: Detailed steps for disassembling and reassembling various deck mechanism parts (e.g., Guide Holder, Cassette Holder, Cylinder Assembly, Capstan Motor) are provided, including figures and adjustment conditions.
- Deck Exploded Views: Exploded diagrams of the deck mechanism are included, showing the location of components and lubrication points, along with a list of recommended lubricants.
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