This document describes the Panasonic RX-DT5, a portable stereo CD system that integrates a radio and cassette player.
Function Description:
The RX-DT5 is a versatile portable audio system designed for playback of Compact Discs (CDs), reception of radio broadcasts (FM, MW, LW), and recording/playback of cassette tapes. It features a top-loading CD player, a dual cassette deck, and a multi-band radio tuner. The system is equipped with dynamic speakers and offers various control options for playback, recording, and tuning. It also includes a remote control for convenient operation.
Important Technical Specifications:
General:
- Power Requirement: AC: (EB) 240V, 50 Hz; (EG) 220V, 50 Hz. Battery: 15V (10 R20/LR20, UM-1 batteries).
- Power Consumption: 43W (AC only).
- Power Output: 50W (25W x 2) PMPO.
- Speaker: 12cm x 2 PM Dynamic speaker (2.7Ω).
- Input: MIX MIC: 2.5mV/200-600Ω, Ø3.5; AUX: 200mV/47kΩ.
- Output: HEADPHONES: 32Ω, Ø3.5.
- Dimensions: 660 (W) x 198 (H) x 251 (D) mm.
- Weight: 6.6kg without batteries.
Disc Player Section:
- Sampling Frequency: 44.1kHz.
- D-A Conversion: 2 DAC 4 time over sampling.
- Beam Source: Semiconductor laser (wavelength 780nm).
- No. of Channels: 2 channels, stereo.
- Frequency Range: 20-20,000Hz (+1/-2dB).
- Dynamic Range: 93dB (1kHz).
- S/N Ratio: 97dB (1kHz).
- Wow and Flutter: Unmeasurable.
Radio Section:
- Frequency Range: FM: 87.5-108MHz; MW: 522-1611kHz; LW: 144-288kHz.
- Intermediate Frequency: FM: 10.7MHz; AM: 459kHz.
- Sensitivity: FM: 11dB/50mW output (-3dB Lim/Sens); MW: 34dB/m/50mW output; LW: 34dB/m/50mW output.
Tape Deck Section:
- Frequency Range: 40-16,000Hz (with normal tape); 40-17,000Hz (with CrO2 tape).
- Recording System: AC bias, AC erase.
- Tape Speed: 4.8cm/s.
- Monitor System: Variable sound monitor.
- Track System: 4-track 2-channel stereo recording and playback.
- Timer/Clock Power Supply: Battery; DC 6V (4 R6/LR6, UM-3 batteries).
Usage Features:
The RX-DT5 offers a comprehensive set of features for user interaction and audio customization:
- CD Playback: Supports standard CDs with features like program play, random play, auto edit, ATLS (Automatic Tape Level Sensor), and repeat functions. The disc holder and eject button facilitate easy disc handling. A unique CD jacket stand allows displaying the currently played CD's cover.
- Radio Tuning: Features a digital tuner with frequency display, preset station memory, and band indicators (FM/LW/MW). Tuning buttons allow precise frequency selection.
- Cassette Deck: Includes a dual cassette holder for Deck 1 and Deck 2, enabling stereo recording and playback. Functions include fast forward/rewind (TPS), reverse side playback, stop, front side playback, and recording pause. A reverse mode selector switch and counter reset button are also available. The system supports both normal and CrO2 tapes, with different frequency ranges for each.
- Timer/Clock: Integrated timer functions for recording (TIMER-REC) and sleep mode (SLEEP), with indicators for ON/OFF times and play mode.
- Audio Enhancement: Equipped with XBS (Extra Bass System) level control for enhanced bass, and a tone control for adjusting audio characteristics.
- Monitoring: Variable sound monitor for tape playback.
- Connectivity: Includes a headphone jack for private listening, and AUX IN jacks for connecting external audio sources. A MIX MIC jack allows for microphone input.
- Remote Control: A dedicated remote control unit provides convenient access to most functions, including power, display selection, CD/Tuner operations (numeric buttons, preset tuning, program, cancel), tape operations (mode selection, deck selection, fast/TPS, playback, rec-pause, stop), and volume control. The remote has a receiving angle of approximately 60° and a maximum usable distance of about 7m.
- Portability: Designed as a portable system with a handle and battery operation capability.
Maintenance Features:
The service manual provides detailed instructions for maintenance and repair, emphasizing safety precautions, especially regarding the laser diode:
- Laser Diode Precaution: The product utilizes an invisible laser diode (780nm wavelength, 100µW/VDE output). Users are warned not to disassemble the optical pick-up unit, adjust the variable resistor on the pick-up unit, or look at the focus lens with optical instruments.
- Electrostatic Breakdown Prevention: Instructions for handling the traverse deck (optical pick-up) include using an anti-static wrist strap and grounding the work table to prevent damage from static electricity.
- Disassembly Instructions: Comprehensive, step-by-step procedures for disassembling various components, including the handle, front cabinet, mechanism unit, upper cabinet, mechanism button, mechanism control P.C.B., CD unit, CD P.C.B., P.C.B. unit, headphones jack P.C.B., relay P.C.B., tuner P.C.B., volume chassis, operation button, LCD, slide knob, switch knob, CD cover, disc holder, CD EJECT lever, CD EJECT button, AF P.C.B., power P.C.B., battery P.C.B., battery terminal, speaker, cassette holder, eject lever, eject button, and Panasonic badge.
- Extension Cable Usage: Specific instructions for using an extension cable (RFKZXDT7) to check the operation P.C.B., tuner P.C.B., and CD section during measurements and adjustments.
- Alignment Procedures: Detailed alignment instructions for the tuner section (MW-RF, LW-RF), cassette deck section (tape speed, record bias, head azimuth), and CD section (mechanical adjustment, best eye/PD balance, focus gain, tracking gain, focus offset, tracking offset, tracking balance). These procedures often require specialized tools like a servo gain adjuster, test discs, oscilloscope, audio frequency oscillator, and conversion connectors.
- Component Identification: Extensive lists of integrated circuits, transistors, diodes, coils, transformers, filters, variable resistors, switches, jacks, capacitors, fuses, and other parts, including their part numbers and descriptions, to aid in replacement and repair. Safety-critical components are marked.
- Circuit Board Diagrams: Detailed diagrams of the tuner, system control, operation (deck), CD, relay, AF, headphones jack, speaker junction, and power supply P.C.B.s, along with wiring connection diagrams, to facilitate troubleshooting and repair.
- FL Panel Description: Provides a visual guide to the front panel display and its various indicators for different functions.
- Battery Replacement: Guidelines for replacing remote control batteries, with an average life of about 1 year.
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